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Advances in microbial remediation for heavy metal treatment: a mini review in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : Advances in microbial remediation for heavy metal treatment: a mini review Type de document : texte imprimé Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bioaccumulation Bioremédiation Boues résiduaires Caractérisation Eaux usées -- Epuration Endophytes Les endophytes (du grec endo "dans", φυτόν "végétal" ; littéralement "à l'intérieur d'un végétal", terme défini et employé pour la première fois en 1866 par Anton de Bary, mais Link est le premier à décrire en 1809 ces organismes sous le terme d'"Entophytae" considérés alors comme un groupe distinct de parasites fongiques) sont tous les micro-organismes (bactéries ou champignons en général) qui accomplissent tout ou partie de leur cycle de vie à l'intérieur d'une plante, de manière symbiotique (endosymbiote), c'est-à-dire avec un bénéfice mutuel pour les deux organismes ou sans conséquences négatives pour la plante-hôte. L'endophyte peut vivre et se reproduire dans les espaces intercellulaires (méats des parenchymes) et/ou dans certaines cellules de la plante. L'endophyte et son hôte entretiennent une interaction appelée endophytisme. Les endophytes qui font partie du microbiote des plantes (le microbiome étant appelé phytobiome) jouent chez elles un rôle assez comparable à celui du microbiote intestinal chez l'animal, rôle qui selon les études les plus récentes, a été très longtemps inconnu puis sous-estimé. De nombreux endophytes ont une activité ou des propriétés favorisant potentiellement la croissance de la plante, ou sa résilience face à certain stress (chaleur, manque d'eau, sel, attaques parasitaires via l'effet bioinsecticide, etc.). Une partie du génome d'endophyte est parfois retrouvée, intégrée, dans l'ADN de la plante-hôte. Métaux lourds Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In recent years, microbiological treatment to remediate contamination by heavy metals has aroused public attention as such pollution has seriously threatens ecosystems and human health and impedes sustainable development. However, the aspect of actual industrial wastewater and solid waste remediation by microorganisms is not explored sufficiently. And what we focus on is technical field of microbial remediation. Therefore, in this review, we discuss and summarize heavy metal treatment via microbiological approaches in different media, including wastewater, solid waste from industrial factories and polluted sites. We also clarify the technical applicability from the perspective of biosorption, bioleaching, biominerization, etc. In particular, the exploration of the combination of microbiological approaches with chemical methods or phytoextraction are scrutinized in this review relative to real waste heavy metal remediation. Furthermore, we highlight the importance of hyperaccumulator endophytes. Note de contenu : - BIOLOGICAL TREATMENT OFHEAVY METAL IN DIFFERENT TYPES OF WASTE : Electroplating effluent and sludge - Pollution of mining waste - Leather tanning effluent and sludge - EXPLOITATION OF HYPERACCUMULATING ENDOPHYTIC MICROBES AS AN EFFICIENT HEAVY METAL BIOREMEDIATION STRATEGY : Endophytes isolation and characterization Endophytes with plant growth promoting properties - Application of endophytic microbes in real contaminants - BIOLOGICAL TECHNIQUE PATTERNS APPLICABLE PRINCIPLES - Table 1 : Assessment and biological treatment of heavy metals in different liquid/solid waste - Table 2 : Mechanisms, advantages, disadvantages, reactor, and applicability of the biological techniques DOI : https://doi.org/10.1186/s42825-020-00042-z En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00042-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37462 [article]

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Lignocellulose aerogel and amorphous silica nanoparticles from rice husks / Zichao Wei in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 7 p. Titre : Lignocellulose aerogel and amorphous silica nanoparticles from rice husks Type de document : texte imprimé Auteurs : Zichao Wei, Auteur ; Andrew T. Smith, Auteur ; William R. T. Tait, Auteur ; Jingjing Liu, Auteur ; Hao Ding, Auteur ; Hui Wang, Auteur ; Weixing Wang, Auteur ; Luyi Sun, Auteur Année de publication : 2021 Article en page(s) : 7 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aérogels Balle de riz Carbone Lignocellulose Matériaux amorphes Nanoparticules Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Index. décimale : 541.34 Solutions Résumé : Rice Husks (RHs) are one of the most abundant sources of biomass in the world due to rice consumption. Lignocellulose and silica are two of the main components of RHs, which allow RHs to be applied in different areas. Lignocellulose can be partially dissolved in 1-butyl-3-methylimidazolium chloride (BMIMCl), which is a simple way of competing with the traditional extraction methods that suffer from high chemical consumption. A lignocellulose freeze gel is obtained via a cyclic liquid nitrogen freeze-thaw (NFT) process. Multi-functional self-assembled lignocellulose aerogel is obtained after CO2 supercritical drying. Based on the aerogel’s special properties, two routes are developed for practical applications. On one hand, the aerogel is coated to exhibit a superhydrophobic property that can be applied as an absorbent for oil spills. On the other hand, a carbon aerogel is synthesized via a pyrolysis process, resulting in a porous amorphous carbon. The residue after partially dissolving lignocellulose in BMIMCl is further calcined to obtain amorphous silica nanoparticles, achieving a comprehensive application of RHs. Note de contenu : - Table 1 : Surface area of the LC aerogel and carbon aerogel DOI : https://doi.org/10.1186/s42825-020-00044-x En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00044-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37463 [article]

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Biomedical application of photo-crosslinked gelatin hydrogels / Lei Xiang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 24 p. Titre : Biomedical application of photo-crosslinked gelatin hydrogels Type de document : texte imprimé Auteurs : Lei Xiang, Auteur ; Wenguo Cui, Auteur Année de publication : 2021 Article en page(s) : 24 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Biomatériaux Gélatine La gélatine est une substance solide translucide, transparente ou légèrement jaune, presque sans goût et sans odeur, obtenue par l'ébullition prolongée de tissus conjonctifs (peaux) ou d'os d'animaux (principalement porc, bœuf, poisson). Elle possède de nombreuses applications dans le domaine culinaire, la médecine, les industries agroalimentaire et pharmaceutique. En matière d’étiquetage, la gélatine est considérée par la norme européenne3 comme un ingrédient et non pas comme un additif, c'est pourquoi elle n'a pas de numéro E. Hors Union européenne, elle est considérée par certains pays comme un additif gélifiant et on peut la trouver avec la dénomination E441. La gélatine est un mélange de protéines obtenu par hydrolyse partielle du collagène extrait de la peau comme la peau de porc (cochon), des os, des cartilages, etc. Les liaisons moléculaires entre les fibres de collagène sont alors brisées. Mélangée à de l'eau, la gélatine forme un gel colloïdal semi-solide thermo-réversible (il fond lorsqu'il est chauffé et recouvre son aspect gélatineux lorsqu'il est refroidi). Sous forme déshydratée, par contre, la gélatine n'a pas de point de fusion et devient friable ou brûle quand elle est chauffée à trop haute températureLa rhéologie de la gélatine se caractérise par un comportement viscoélastique, et des contraintes trop élevées ou appliquées trop rapidement peuvent entraîner une rupture fragile (fracturation) ou ductile6. Le caractère plutôt élastique/fragile ou plutôt visqueux/ductile dépend de la concentration en gélatine de la solution aqueuse et de la température, ainsi que de la durée de la mise sous contrainteLes acides aminés constituant la gélatine sont : la glycine (21 %), la proline (12 %), l'hydroxyproline (12 %), l'acide glutamique (10 %), l'alanine (9 %), l'arginine (8 %), l'acide aspartique (6 %), la lysine (4 %), la sérine (4 %), la leucine (3 %), la valine, la phénylalanine et la thréonine (2 %), l'isoleucine et l'hydroxylysine (1 %), la méthionine et l'histidine (< 1 %) et la tyrosine (< 0,5 %). Ces valeurs sont variables (surtout pour les constituants minoritaires) et dépendent de la source de matériaux bruts et de la technique de préparation. La gélatine est constituée à environ 98-99 % (en poids sec) de protéines et contient 18 acides aminés dont huit des neuf acides aminés essentiels à l'Homme. Elle n'a qu'une relative valeur nutritionnelle du fait de l'absence de tryptophane et de son déficit en isoleucine, thréonine et méthionine; elle possède également un taux inhabituellement élevé d'acides aminés non essentiels, la glycine et la proline (qui sont produits par le corps humain). (Wikipedia) hydrocolloïdes Technologie médicale Index. décimale : 541.34 Solutions Résumé : During the past decades, photo-crosslinked gelatin hydrogel (methacrylated gelatin, GelMA) has gained a lot of attention due to its remarkable application in the biomedical field. It has been widely used in cell transplantation, cell culture and drug delivery, based on its crosslinking to form hydrogels with tunable mechanical properties and excellent bio-compatibility when exposed to light irradiation to mimic the micro-environment of native extracellular matrix (ECM). Because of its unique biofunctionality and mechanical tenability, it has also been widely applied in the repair and regeneration of bone, heart, cornea, epidermal tissue, cartilage, vascular, peripheral nerve, oral mucosa, and skeletal muscle et al. The purpose of this review is to summarize the recent application of GelMA in drug delivery and tissue engineering field. Moreover, this review article will briefly introduce both the development of GelMA and the characterization of GelMA. Finally, we discuss the challenges and future development prospects of GelMA as a tissue engineering material and drug or gene delivery carrier, hoping to contribute to accelerating the development of GelMA in the biomedical field. Note de contenu : - Basic synthetic procedures and influencing factors on GelMA hydrogels characterization : Basic synthetic steps - Influencing factors on GelMA hydrogels characterization - GelMA for drug delivery - GelMA for neovascularization - GelMA for nerve engineering - GelMA for bone defect regeneration - GelMA for cartilage engineering - GelMA for skeletal muscle engineering - GelMA for heart engineering - GelMA for skin tissue engineering - GelMA for cornea stroma and other tissue engineering DOI : https://doi.org/10.1186/s42825-020-00043-y En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00043-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37464 [article]

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Recent advances in skin collagen : functionality and non-medical applications / Yanting Han in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 12 p. Titre : Recent advances in skin collagen : functionality and non-medical applications Type de document : texte imprimé Auteurs : Yanting Han, Auteur ; Jinlian Hu, Auteur ; Gang Sun, Auteur Année de publication : 2021 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Blindage (électricité) Collagène Eau -- Epuration Effet mémoire de forme Electronique -- Matériaux Imperméabilisation Matériaux intelligents Matrices Peau artificielle Index. décimale : 611.78 Peau et ongles Résumé : During nature evolution process, living organisms have gradually adapted to the environment and been adept in synthesizing high performance structural materials at mild conditions by using fairly simple building elements. The skin, as the largest organ of animals, is such a representative example. Conferred by its intricate organization where collagen fibers are arranged in a randomly interwoven network, skin collagen (SC), defined as a biomass derived from skin by removing non-collagen components displays remarkable performance with combinations of mechanical properties, chemical-reactivity and biocompatibility, which far surpasses those of synthetic materials. At present, the application of SC in medical field has been largely studied, and there have been many reviews summarizing these efforts. However, the generalized view on the aspects of SC as smart materials in non-medical fields is still lacking, although SC has shown great potential in terms of its intrinsic properties and functionality. Hence, this review will provide a comprehensive summary that integrated the recent advances in SC, including its preparation method, structure, reactivity, and functionality, as well as applications, particularly in the promising area of smart materials. Note de contenu : - Preparation of SC - Structure of SC - Modification of SC - Advanced properties and non-medical applications : Water treatment - Biotemplate - Wave-adsorbing/shielding - Shape memory - Waterproof - Electronic skin - Table 1 : Modification agents for SC DOI : https://doi.org/10.1186/s42825-020-00046-9 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00046-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37465 [article]

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Investigations on the general properties of biomass-based aldehyde tanned sheep fur for its selective post-tanning processing / Wei Ding in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p. Titre : Investigations on the general properties of biomass-based aldehyde tanned sheep fur for its selective post-tanning processing Type de document : texte imprimé Auteurs : Wei Ding, Auteur ; Ya-Nan Wang, Auteur ; Jianfei Zhou, Auteur ; Haiteng Liu, Auteur ; Xiaoyan Pang, Auteur ; Bi Shi, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alginate de sodium dialdéhyde Biomasse Chimie analytique Fourrures Fourrures -- Propriétés physiques Fourrures -- Teinture Laine de mouton Post-tannage Rayonnement ultraviolet Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Dialdehyde sodium alginate (DSA) is an alternative chrome-free tanning material for fur production. To obtain satisfactory resultant fur and provide suggestions for the usage of DSA in fur making, the general properties of DSA tanned sheep fur were systematically investigated. The tanning mechanism of DSA was analyzed and it was verified that DSA was mainly combined with collagen fiber by forming Schiff base covalent bonds while supplemented by a small number of hydrogen bonds and ionic bonds. Due to the acid sensitivity of Schiff base structure, DSA tanned fur had poor resistance to acid rinsing but had excellent resistance to washing and good fatliquoring performance. Also, it had good resistances to yellowing and reductant. After being retanned by chrome tanning agent, the fur was capable of enduring a high-temperature dyeing process (68 °C for 8 h). Overall, DSA tanned sheep fur had favorable properties under appropriate post-tanning processing conditions to manufacture light-colored or dark-colored fur products with desirable physical properties. Note de contenu : - EXPERIMENTAL : Materials - Tanning mechanism analysis of DSA - Fatliquoring of DSA tanned fur - Interactions between Cr (III) and DSA - Chrome-reduced combination tanning trials - Analytical methods - RESULTS AND DISCUSSION : Tanning mechanism of DSA - Stability of DSA tanned sheep fur - Fatliquoring performance - Chrome-reduced combination tanning performance based on DSA - combination tanned sheep fur - Table 1 : Effect of UV-irradiation on the chrominance of tanned sheep fur - Table 2 Physical properties of fatliquored DSA tanned sheep fur - Table 3 High-temperature dyeing performance of chrome-reduced - Table 4 : Physical properties of fatliquored sheep fur made from chrome-reduced combination tanning based on DSA DOI : https://doi.org/10.1186/s42825-020-00047-8 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00047-8.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37466 [article]

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Synthesis and application of non-bioaccumulable fluorinated surfactants : a review / Rong Zhou in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p. Titre : Synthesis and application of non-bioaccumulable fluorinated surfactants : a review Type de document : texte imprimé Auteurs : Rong Zhou, Auteur ; Yong Jin, Auteur ; Yichao Shen, Auteur ; Peng Zhao, Auteur ; Yutang Zhou, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcènes Maroquinerie Molécules non bioaccumulables Polymérisation en émulsion Protéines Relations structure-activité Surfactants -- Synthèse Surfactants fluorés Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Due to negative effects of conventional fluorinated surfactants with long perfluorocarbon chain (CxF2x+ 1, x≥7) like perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS), these conventional long perfluorocarbon chain surfactants have been restricted in many industrial applications. Nowadays, their potential non-bioaccumulable alternatives have been developed to meet the requirements of environmental sustainable development. In this paper, the recent advances of potential non-bioaccumulable fluorinated surfactants with different fluorocarbon chain structures, including the short perfluorocarbon chain, the branched fluorocarbon chain, and the fluorocarbon chain with weak points, are reviewed from the aspects of synthesis processes, properties, and structure-activity relationships. And their applications in emulsion polymerization of fluorinated olefins, handling membrane proteins, and leather manufacture also are summarized. Furthermore, the challenges embedded in the current non-bioaccumulable fluorinated surfactants are also highlighted and discussed with the hope to provide a valuable reference for the prosperous development of fluorinated surfactants. Note de contenu : - SYNTHESIS OF NON-BIOACCUMULABLE FLUORINATED SURFACTANTS : Surfactants with short perfluorocarbon chain - Surfactants with weak points on fluorocarbon chain - Surfactants with branched fluorocarbon chain APPLICATION OF NON-BIOACCUMULABLE FLUORINATED SURFACTANTS : Application in emulsion polymerization of fluorinated olefins - Application in handling membrane proteins - Application in leather manufacture - Table 1 : CMC and γCMC of some perfluorooctyl surfactants - Table 2 : Serum elimination half-lives of some fluorinated surfactants (KPFOS, PFOA, perfluoroheptanoic acid (PFHA), perfluorohexanoic acid (PFHxA), potassium perfluorobutylsulfonate (KPFBS), ammonium 2,3,3,3-tetrafluoro-2-(heptafluoropropoxy) propanoate acid (GenX) and ammonium 4,8-dioxa-3H-perfluorononanoate (ADONA)) in female (F) and male (M) rats, monkeys and humans - Table 3 : Surface tensions (mN/m) of fluorinated pyridinium and ammonium cationic surfactants in deionized water at 23 °C DOI : https://doi.org/10.1186/s42825-020-00048-7 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00048-7.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37467 [article]

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Hyperbranched polymer surfactant : synthesis, characterization and surface tension activity / Ren Longfang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p. Titre : Hyperbranched polymer surfactant : synthesis, characterization and surface tension activity Type de document : texte imprimé Auteurs : Ren Longfang, Auteur ; Zheng Tang, Auteur ; Taotao Qiang, Auteur ; Guoguo Zhang, Auteur Année de publication : 2021 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chlorure d'acide gras Concentration micellaire critique Polymères ramifiés Surfactants -- Synthèse Tension superficielle Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : A series of hyperbranched polymer surfactants (HBP-C8, HBP-C12 and HBP-C16) were synthesized by the reaction between hydroxyl-terminated hyperbranched polymers (HBP) and fatty acyl chloride. The structure of obtained hyperbranched polymer surfactant was characterized by FTIR, NMR and GPC. The results showed that the products have amphiphilic structure. The thermal property of the hyperbranched polymer surfactant investigated by DSC and TGA was strongly influenced by the length of end alkyl chain. Surface activity of hyperbranched polymer surfactant was analyzed by surface tension method and UV spectrophotometry, respectively. The results showed that hyperbranched polymer surfactant took on better surface activity, which can effectively reduce the surface tension of the water. The hyperbranched polymer surfactant has a lower critical micelle concentration (CMC) and displays single molecular micellar properties, which can package small hydrophilic molecules in relatively low concentration. Note de contenu : - EXPERIMENTAL : Materials - Synthesis of hyperbranched polymer surfactant - Testing and characterization - Surface tension activity of HBP-C - Critical micelle concentration (CMC) of HBP-C - RESULTS AND DISCUSSION : Characterization of HBP-C - Optimization of HBP-C - Grafting rate of HBP-C - Thermal properties of HBP-C - Surface tension of HBP-C - CMC of HBP-C - Table 1 The grafting rate of HBP-C - Table 2 GPC results of HBP-C DOI : https://doi.org/10.1186/s42825-020-00049-6 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00049-6.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37473 [article]

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Application of amphoteric polymers in the process of leather post-tanning / Xuechuan Wang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 9 p. Titre : Application of amphoteric polymers in the process of leather post-tanning Type de document : texte imprimé Auteurs : Xuechuan Wang, Auteur ; Sun Siwei, Auteur ; Xing Zhu, Auteur ; Guo Peiying, Auteur ; Liu Xinhua, Auteur ; Chunlin Liu, Auteur ; Meng Lei, Auteur Année de publication : 2021 Article en page(s) : 9 p. Langues : Anglais (eng) Catégories : Agents de tannage Composés amphotériques Cuirs et peaux Polymères -- Synthèse Post-tannage Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : With the characteristics of controllable charge and environmental friendliness, amphoteric polymers can be used in post-tanning process to solve the problems that arise during leather making and are caused by the low absorption rate of single-charge chemicals, incompatibility with new tanning methods, and complex operation process. In this review, the structure, performance, and preparation of amphoteric polymers are reported. Then, the charge change of collagen during different tanning and pH treatments is introduced. Finally, the application and development of amphoteric polymers during the post-tanning process of leather making are discussed. This review has certain guiding significance to the preparation and application of amphoteric polymers for tanning system. Note de contenu : - STRUCTURE, PROPERTIES, AND SYNTHESIS METHODS OF AMPHOTERIC POLYMERS : Structure and properties of amphoteric polymers - Synthetic methods of amphoteric polymers - AMPHOTERIC PROPERTIES OF COLLAGEN AFTER TANNING : - RESEARCH PROGRESS OF AMPHOTERIC POLYMER DURING POST-TANNING : Retanning agent - Fatliquoring agent - Other materials - CONCLUSIONS AND PROSPECTS : Development of amphoteric polymers with different structures for leather making - Study on the interaction mechanism between amphoteric polymers and leather Exploration of characterization methods - Clean application process of amphoteric materials in post-tanning Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37474 [article]

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Research on the composite and functional characteristics of leather fiber mixed with nitrile rubber / Guo Jun in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 12 p. Titre : Research on the composite and functional characteristics of leather fiber mixed with nitrile rubber Type de document : texte imprimé Auteurs : Guo Jun, Auteur ; Rui Dai, Auteur ; Hui Chen, Auteur ; Yan Liang, Auteur ; Zhihua Shan, Auteur Année de publication : 2021 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caoutchouc nitrile-butadiène Composites -- Propriétés mécaniques Composites -- Propriétés thermiques Cuir -- teneur en chrome Cuirs et peaux -- Déchets -- Recyclage Lixiviation Mélange Résistance au vieillissement Vulcanisation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The recycling of leather solid waste not only involves resource utilization and environmental protection but also has important significance for the sustainable development of the leather industry. In this paper, the leather waste was crushed into fibers, which were stabilized and mixed with nitrile-butadiene rubber (NBR). The mixture was milled and vulcanized and a composite NBR-SLF (Stabilized Leather Fiber) is prepared for sealing material. The physical and mechanical properties, water resistance, oil resistance and aging resistance of NBR-SLF were tested and analyzed. It is found that the optimized NBR-SLF not only reduces the cost of raw material, but also changes the physical and mechanical performance of NBR. As a sealing material, it satisfies the substitution of NBR in terms of hardness and thermal stability. Especially the anti-aging ability is better than NBR. Note de contenu : - EXPERIMENTAL : Main materials - Crushing of LW - Stabilization treatment of LF - Cr leaching of SLF - Preparation of NBR-SLF composite - Morphologies observations of NBR-SLF - Mechanical performance test of NBR-SLF - Thermal performance of NBR-SLF - Vulcanization characteristics of NBR-SLF - Resistance of NBR-SLF to media - Resistance of NBR-SLF to aging - RESULTS AND DISCUSSION : Cr leaching of SLF - Optimization of mechanical performance and conditions of NBR-SLF - Thermal performance of NBR-SLF - Vulcanization characteristics of NBR-SLF - Resistance of NBR-SLF to media - Resistance of NBR-SLF to aging - Table 1 : NBR-SLF composite recipe - Table 2 : Cr (VI) and total Cr content measured by two leaching methods - Table 3 : Effect of SLF amount on curing NBR-SLF - Table 4 : Experimental physical parameters of NBR-SLF DOI : https://doi.org/10.1186/s42825-020-00052-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00052-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37475 [article]

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Effect of hydrophilic or hydrophobic interactions on the self-assembly behavior and micro-morphology of a collagen mimetic peptide / Xiaomin Luo in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : Effect of hydrophilic or hydrophobic interactions on the self-assembly behavior and micro-morphology of a collagen mimetic peptide Type de document : texte imprimé Auteurs : Xiaomin Luo, Auteur ; Qianqian Huo, Auteur ; Liu Xinhua, Auteur ; Chi Zheng, Auteur ; Ying Liu, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chimie biomimétique Collagène Dynamique moléculaire Hydrophilie Hydrophobie Morphologie (matériaux) Peptides Systèmes auto-assemblés Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Peptide self-assembles with bionic properties have been widely utilized for bioactive drugs and biomedical materials. Collagen mimetic peptide (CMP) gains more attention due to its unique advantages in biosecurity and function. Unfortunately, the self-assembly mechanism of CMP, particularly the effect of intermolecular forces on its self-assembly behavior and morphology, is still unrecognized. Herein, the hydrophilic glycidol (GCD) and hydrophobic Y-glycidyl ether oxypropyl trimethoxysilane (GLH) were grafted onto the side chains of CMP through the ring-opening reaction (GCD/CMP, GLH/CMP). Subsequently, the effects of hydrophilic and hydrophobic interactions on the self-assembly behavior and morphology of CMP were further studied. The results substantiated that the GCD/CMP and GLH/CMP self-assembly followed “nucleation-growth” mechanism, and the supererogatory hydrophilic and hydrophobic groups prolonged the nucleation and growth time of CMP self-assembly. Noted that the hydrophilic interaction had stronger driving effects than hydrophobic interaction on the self-assembly of CMP. The GCD/CMP and GLH/CMP self-assembles exhibited fibrous 3D network and microsphere morphology, respectively. Furthermore, the GLH/CMP self-assembles had better resistance to degradation. Consequently, the microtopography and degradation properties of CMP self-assembles could be controlled by the hydrophilic and hydrophobic interactions between CMP, which would further provide a way for subsequent purposeful design of biomedical materials. Note de contenu : - EXPERIMENTS : Materials - Preparation of GCD/CMP, GLH/CMP and their homologous assemblies - Structural characterization of GCD/CMP, GLH/CMP - Self-assembly kinetics of GCD/CMP and GLH/CMP assemblies - Mico-morphology analysis of GCD/CMP and GLH/CMP assemblies - Performance characterization of GCD/CMP and GLH/CMP assemblies - RESULTS AND DISCUSSION : Preparation and structural analysis of GCD/CMP and GLH/CMP - The self-assembly behavior of CMP, GCD/CMP and GLH/CMP - Performance analysis of CMP, GCD/CMP and GLH/CMP assemblies - Table 1 Self-assembly rates of CMP, GCD/CMP and GLH/CMP DOI : https://doi.org/10.1186/s42825-020-00054-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00054-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37476 [article]

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Chitosan based antibacterial composite materials for leather industry : a review / Linlin Yuan in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 18 p. Titre : Chitosan based antibacterial composite materials for leather industry : a review Type de document : texte imprimé Auteurs : Linlin Yuan, Auteur ; Qingda Yao, Auteur ; Yongxian Liang, Auteur ; Ye Dan, Auteur ; Yixiao Wang, Auteur ; Wen Huitao, Auteur ; Yiqing Yang, Auteur ; Weihua Dan, Auteur Année de publication : 2021 Article en page(s) : 18 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antibactériens Chitosane Le chitosane ou chitosan est un polyoside composé de la distribution aléatoire de D-glucosamine liée en ß-(1-4) (unité désacétylée) et de N-acétyl-D-glucosamine (unité acétylée). Il est produit par désacétylation chimique (en milieu alcalin) ou enzymatique de la chitine, le composant de l'exosquelette des arthropodes (crustacés) ou de l'endosquelette des céphalopodes (calmars...) ou encore de la paroi des champignons. Cette matière première est déminéralisée par traitement à l'acide chlorhydrique, puis déprotéinée en présence de soude ou de potasse et enfin décolorée grâce à un agent oxydant. Le degré d'acétylation (DA) est le pourcentage d'unités acétylées par rapport au nombre d'unités totales, il peut être déterminé par spectroscopie infrarouge à transformée de Fourier (IR-TF) ou par un titrage par une base forte. La frontière entre chitosane et chitine correspond à un DA de 50 % : en deçà le composé est nommé chitosane, au-delà, chitine. Le chitosane est soluble en milieu acide contrairement à la chitine qui est insoluble. Il est important de faire la distinction entre le degré d'acétylation (DA) et le degré de déacétylation (DD). L'un étant l'inverse de l'autre c'est-à-dire que du chitosane ayant un DD de 85 %, possède 15 % de groupements acétyles et 85 % de groupements amines sur ses chaînes. Le chitosane est biodégradable et biocompatible (notamment hémocompatible). Il est également bactériostatique et fongistatique. Le chitosane est également utilisé pour le traitement des eaux usées par filtration ainsi que dans divers domaines comme la cosmétique, la diététique et la médecine. Collagène Composites Cuir Graphène Le graphène est un cristal bidimensionnel (monoplan) de carbone dont l'empilement constitue le graphite. Il a été isolé en 2004 par Andre Geim, du département de physique de l'université de Manchester, qui a reçu pour cette découverte le prix Nobel de physique en 2010 avec Konstantin Novoselov. Il peut être produit de deux manières : par extraction mécanique du graphite (graphène exfolié) dont la technique a été mise au point en 2004, ou par chauffage d'un cristal de carbure de silicium, qui permet la libération des atomes de silicium (graphène epitaxié). Record en conduction thermique jusqu'à 5300 W.m-1.K-1. C'est aussi un matériaux conducteur. Polyéthylène glycol Tanins Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Chitosan is an amorphous translucent substance with a structural unit similar to the polysaccharide structure of the extracellular matrix, It has good antibacterial, biocompatible, and degradable properties. It has important application value in leather, water treatment, medicine, food and other fields, so chitosan and its modified products have received widespread attention. This article reviewed the preparation methods of chitosan-based antibacterial composites in recent years, including chitosan/collagen, chitosan/graphene, chitosan/tannic acid, and chitosan/polyethylene glycol composite materials, elaborates their modification methods and antibacterial mechanism were reviewed in detail, and its applications in the leather industry as antibacterial auxiliaries and water treatment antibacterial adsorption materials were discussed. Finally, the future development and challenges of chitosan-based composite materials in the leather industry were forecasted. Note de contenu : - CHITOSAN-BASED COMPOSITE MATERIAL : Chitosan/collagen composite material - Chitosan/graphene composite material Chitosan/tannin acid composite material - Chitosan/polyethylene glycol composite material APPLICATION OF CHITOSAN-BASED COMPOSITES IN THE LEATHER INDUSTRY : Leather auxiliaries - Water treatment - Table 1 : The summarized of chitosan/GO composite applied in water treatment DOI : https://doi.org/10.1186/s42825-020-00045-w En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00045-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37477 [article]

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Tanning capacity of Tessmannia burttii extracts : the potential eco-friendly tanning agents for the leather industry / Cecilia R. China in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 9 p. Titre : Tanning capacity of Tessmannia burttii extracts : the potential eco-friendly tanning agents for the leather industry Type de document : texte imprimé Auteurs : Cecilia R. China, Auteur ; Stephen S. Nyandoro, Auteur ; Joan J. E. Munissi, Auteur ; Mihayo M. Maguta, Auteur ; Michael Meyer, Auteur ; Michaela Schroepfer, Auteur Année de publication : 2021 Article en page(s) : 9 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Industrie -- Aspect de l'environnement Extraction (chimie) Extraits de plantes Flavonoïdes Phénols Tanins végétaux Tannage végétal Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the present study, the tannins from stem and root barks of Tessmannia burttii Harms (Caesalpiniaceae), a plant species abundantly growing in Tanzania and other parts of Africa, were investigated for their suitability in hides tanning. Tannin powder was extracted at selected temperatures (30, 50 and 80 °C) and the influence of each temperature on the crosslinking capacity was evaluated. The interaction mechanism between hide powder collagen and the tannins was studied by Differential Scanning Calorimetry (DSC), trinitrobenzensulfonic (TNBS) acid assay and amino acid hydrolysis methods. Extraction temperatures showed low influence on crosslinking capacity of the tannins. However, extract obtained at 50 °C exhibited best performance in terms of gap size between Tonset and Tpeak. The stem bark extract yield was higher than that from the root bark, but both were within the recommended ranges. The tannin content (61%) of T. burttii stem bark extract was above recommended value (10%), whereas its total phenolic content and total flavonoic content were found to be above that of commercial Acacia mearnsii tannin. The study of cross-linking parameters as a function of pH showed cross-linking to occur via a covalent mechanism at the basic amino groups. However, the bonds were not resistant to acid hydrolysis. The observed interaction mechanism indicated that tannins from stem and root barks of T. burttii belong to the condensed tannin, similar to A. mearnsii (black wattle), a commercial tannin source that was used in this study as a reference. Findings from this study depict that T. burttii extracts are auspicious eco-friendly alternative source of vegetable tannins to overcome the use of chromium salts in the leather industry. Note de contenu : - Effect of extraction temperature on crosslinking capacity - The extract yield, tannin content, total phenolic and flavonoid contents of the Tessmannia burttii extracts - The interaction mechanism between vegetable tannins from Tessmannia burttii and collagen of the hide - Table 1 : The interval between Tonset and Tpeak of hide powder cross-linked with extract of Tessmannia burttii and Acacia mearnsii at pH 5 in dependence of Temperature of extraction - Table 2 : Tannin content, total phenolic content and total flavonoid content of the T. burttii extracts extracted at 50 °C DOI : https://doi.org/10.1186/s42825-021-00055-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00055-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37539 [article]

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Modeling of strain and filtration properties of a semi-finished leather product / A. Amanov in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 8 p. Titre : Modeling of strain and filtration properties of a semi-finished leather product Type de document : texte imprimé Auteurs : A. Amanov, Auteur ; S. R. Khurramov, Auteur ; G. A. Bahadirov, Auteur ; A. Abdukarimov, Auteur ; T. Y. Amanov, Auteur Année de publication : 2021 Article en page(s) : 8 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir semi-fini Déformations (mécanique) Filtration Modèles mathématiques Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A study on deformation and filtration properties of a leather semi-finished product after chrome tanning are presented. The analytical dependences of compressive load on compressive (recovery) strain and moisture content of a leather semi-finished product are obtained. The empirical dependences of hydraulic gradient on filtration rates are determined for various compression ratios of the leather semi-finished product. It was revealed that with an increase in compressive load and moisture content of the leather semi-finished product, the compressive deformation increases. The shoulder section is subject to the greatest deformation, then the belly section and the least deformation is observed in the butt section. A linear relationship has been established between the hydraulic gradient and the rate of moisture filtration through the leather semi-finished product in the directions perpendicular and parallel to its surface. Note de contenu : - Experimental studies : Study of deformation properties of a leather semi-finished product - Study of filtration properties of a leather semi-finished product - Mathematical processing of experimental results DOI : https://doi.org/10.1186/s42825-021-00056-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00056-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37540 [article]

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A chrome-free combination tanning strategy : based on silicic acid and plant tannin / Zetian Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p. Titre : A chrome-free combination tanning strategy : based on silicic acid and plant tannin Type de document : texte imprimé Auteurs : Zetian Zhang, Auteur ; Yang Liu, Auteur ; Junchao Wang, Auteur ; Taoling Xie, Auteur ; Liying Sun, Auteur ; Zhengjun Li, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Angle de contact Caractérisation Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés physiques Eaux usées -- Analyse Humidité -- Absorption:Eau -- Absorption Silicique, Acide Stabilité au stockage Stabilité thermique Tanins végétaux Tannage chrome free Tannage combiné Le tannage combiné se dit des tannages qui allient deux familles ou genre de tannage pour obtenir un résultat additionnant les qualités complémentaires des tannins mis en œuvre par exemple Chrome-Végétal ou Chrome-Synthétique Température de retrait Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Silicic acid, commonly derived from cheap and easily available sodium silicate, has recently received great attention for application in leather industry to produce ecological leather with a cleaner approach. However, leather tanned with silicic acid alone is poor in storage stability, which limits its practical application in leather production. In this work, a new environment-friendly combination tannage based on silicic acid and plant tannin was developed to address this issue along with improving the comprehensive performances of leather. The obtained leather was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and so on. The results showed that compared with leather tanned with silicic acid alone, the leather tanned with this combination method possessed improved thermal stability, enhanced mechanical properties, acceptable softness, appropriate hydrophilicity, and especially enhanced storage stability. More importantly, the combination tanned leather with 1:1 of the mass ratio of silicic acid to vegetable tannin (composed of valonea extract and mimosa extract with the same weight) had more prominent comprehensive performances. In addition, the results demonstrated that hydrogen bonding played an important role in the combination tanning process. Furthermore, the hydrogen bonds generated between phenolic hydroxyl groups of polyphenols with silicon hydroxyl groups of silicic acid molecules inhibited the excessive condensation of Si-OH groups between themselves. Subsequently, the assessment of environmental impact revealed the value of BOD5/COD of the wastewater produced in this combination tanning process is more than 0.3, indicating the chrome-free combination tannage based on silicic acid and plant tannin was an environment-friendly tanning technology. These findings therefore indicated that a new chrome-free tanning method with silicon and biomass materials as main tanning agents has potential practical application prospect in leather production. Note de contenu : - EXPERIMENTAL : Materials - Tanning process - Characterization - RESULTS AND DISCUSSION : Thermal stability - Physical and mechanical properties - Water absorption and contact angle - Porous structure and micromorphology - Chemical structure characterization - Waste water assessment - Table 1 : Silicic acid-vegetable tannin combination tanning process - Table 2 : Shrinkage temperature of the samples - Table 3 : Weight loss rate and Tmax of the samples at different storage time - Table 4 : Analysis results of tannery wastewater DOI : https://doi.org/10.1186/s42825-021-00058-z En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00058-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37541 [article]

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Synthesis of sulfonated Sesamum indicum L. seed oil and its application as a fatliquor in leather processing / Adachukwu N. Nkwor in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p. Titre : Synthesis of sulfonated Sesamum indicum L. seed oil and its application as a fatliquor in leather processing Type de document : texte imprimé Auteurs : Adachukwu N. Nkwor, Auteur ; Pius O. Ukoha, Auteur ; Ikhazuagbe H. Ifijen, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Chimie analytique Composés organiques -- Synthèse Cuirs et peaux -- Propriétés mécaniques Emulsions Extraction (chimie) Huile de sésame Produits de nourriture du cuir Sulfonation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fatliquor is an oil-in-water emulsion that improves the physical properties of leather such as tensile strength, flexibility, and softness by lubricating the leather fibres. Sulfonated Sesamum indicum oil was synthesized, characterized, and examined for consideration as a substitute for imported fatliquor in Nigeria. The sulfonation of the oil was confirmed by the significant observations made in the FTIR, 1H NMR, 13C NMR, and 13C NMR DEPT analysis results. A remarkable difference was observed in the physicochemical properties results of both unsulfonated and sulfonated oils. The sulfonated sesame fatliquor was applied onto goatskin and compared with a commercial sulfated fatliquor in the processing of shoe upper leather using standard methods. The average results for tensile strength, double edge tear, elongation, and softness results for the commercial and synthesized fatliquors are as follows: 14.27 N/mm2; 13.77 N/mm2, 50.61 N; 60.11 N, 38.06%; 54.28%, 25.2; 25.0. A comparable level of lubrication of the leather treated with the sulfonated Sesamum indicum oil and that treated with the commercial leather fatliquor was revealed by the Sudan IV stain test as well as scanning electron microscopy analysis results. Experimental analyses, therefore, show that the as-synthesized sulfonated Sesamum indicum oil could be considered as a substitute for imported fatliquor in the leather industry. Note de contenu : - MATERIALS AND METHODS : Materials - Sample seed preparation - Extraction of Sesamum indicum oil - Sulfonation reaction procedure - Characterizations of S. indicum oil - Leather shoe upper manufacturing process - Strength/mechanical/physical properties of the shoe upper leathers - RESULTS AND DISCUSSION : Fatty acid composition - Sulfonation reaction process - Physiochemical properties of the oil - Structural analysis - NMR spectral characterisation - Stability of the 10% Fatliquor emulsions - Mechanical properties results - Table 1 : Fatliquoring process for shoe upper leather manufacture - Table 2 : Fatty acid profile of s. indicum oil - Table 3 : Physicochemical properties of unsulfonated and sulfonated s. indicum oil - Table 4 : Evaluation of the ft-ir spectra - Table 5 : 1h nmr evaluation of unsulfonated and sulfonated oils - Table 6 : Stability of 10% sulfonated s. indicum fatliquor towards pickle liquor, tan liquor and hard water - Table 7 : Tensile strength, elongation at break and double edge tear results - Table 8 : Strength of grain surface of leather test pieces DOI : https://doi.org/10.1186/s42825-021-00053-4 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00053-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37542 [article]

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Heat development at the knife roller during leather shaving / Tilman Witt in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p. Titre : Heat development at the knife roller during leather shaving Type de document : texte imprimé Auteurs : Tilman Witt, Auteur ; Anke Mondschein, Auteur ; Jens-Peter Majschak, Auteur ; Michael Meyer, Auteur Année de publication : 2021 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux Cuirs et peaux -- Analyse Cylindre à couteaux Dérayage Dérayures de cuir Eléments finis, Méthode des Thermocinétique Thermographie Thermométrie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather, which is regularly tanned from whole hides of up to 5 m2, needs a constant thickness over the entire surface in order to be processed into high-quality consumer goods such as shoes, furniture and car interiors. Precise adjustment of the thickness is achieved by shaving. On an industrial scale, rotating knife rollers are used to remove chips from the flesh side of semi-finished leathers whereby adjusting the specified thickness and generating a smooth surface. Care must be taken to prevent the temperature from rising above the denaturation temperature of the leather during shaving in order to avoid any loss of quality. Beside this, temperature rise is always a sign of friction showing avoidable energy expenditure. In order to localize the source of friction during shaving, actual temperature development at the roller knife is studied. Different measuring methods are used to evaluate the temperature increase at the blade roll of the shaving machine. The finite element method is used to thermally simulate the process. Measured temperatures, the geometry of the blade roll and process data are taken into account for modelling the temperature development close to the blade edge. The obtained results enhance the understanding of temperature generating processes during machine operation and allow conclusions about potential improvements in the design of the machine and blades. Note de contenu : - INTRODUCTION : Leather reactions to thermal stress - The shaving machine - Cutting principle and energy consumption - MATERIALS AND METHODS : Pre tanned leathers and shaving - Analysis of shaved hides - High speed infrared imaging - Temperature measurement of the cutting tool - Measurement of the roller turning speed - Thermal modelling with finite element method - Calculating the heat transfer coefficient - RESULTS : Thermography - Thermistor measurements - Transient finite element simulation - Analysis of shaved hides - Table 1 : Rizzi LW 3200 Shaving Machine Characteristics - Table 2 : Relevant material properties of steel - Table 3 : Selected material values for the surrounding fluid DOI : https://doi.org/10.1186/s42825-021-00057-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00057-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37543 [article]

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Collagen fiber membrane-derived chemically and mechanically durable superhydrophobic membrane for high-performance emulsion separation / Huifang Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : Collagen fiber membrane-derived chemically and mechanically durable superhydrophobic membrane for high-performance emulsion separation Type de document : texte imprimé Auteurs : Huifang Li, Auteur ; Wan Zheng, Auteur ; Hanzhong Xiao, Auteur ; Baicun Hao, Auteur ; Yujia Wang, Auteur ; Xin Huang, Auteur ; Bi Shi, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation Composés organométalliques Emulsions Fibrilles de collagène La fibrille de collagène est une structure constituée d'un assemblage de fibres de tropocollagène (assemblage de 3 protéines de collagène alpha (alpha 1 - alpha 1 - alpha 2) en une hélice droite. Hydrophobie Membranes (technologie) Nanoparticules -- Synthèse Polydiméthylsiloxane Le polydiméthylsiloxane —[O-Si(CH3)2]n—, ou poly(diméthylsiloxane) selon la nomenclature systématique, communément appelé PDMS ou diméthicone, est un polymère organominéral de la famille des siloxanes souvent présent dans les shampoings. On l'y ajoute pour augmenter le volume des cheveux mais il peut également aller boucher les pores du cuir chevelu et rendre les cheveux gras. C'est une des raisons pour lesquelles se laver les cheveux tous les jours est très déconseillé avec un shampooing contenant des silicones. Il existe également de l'amodiméthicone, qui est un dérivé du diméthicone. Le polydiméthylsiloxane est un additif alimentaire (E900), utilisé comme antimoussant dans les boissons (Coca-Cola BlāK). La chaîne de poly(diméthylsiloxane) forme également la structure de base des huiles et des caoutchoucs silicones. Séparation (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Developing high-performance separation membrane with good durability is a highly desired while challenging issue. Herein, we reported the successful fabrication of chemically and mechanically durable superhydrophobic membrane that was prepared by embedding UiO-66 as size-sieving sites within the supramolecular fiber structure of collagen fiber membrane (CFM), followed by the polydimethylsiloxane (PDMS) coating. The as-prepared CFM/UiO-66(12)/PDMS membrane featured capillary effect-enhanced separation flux and homogeneous porous channels guaranteed high separation efficiency. When utilized as double-layer separation membranes, this new type of composite membranes separated various surfactant stabilized water-in-oil microemulsions and nanoemulsions, with the separation efficiency high up to 99.993 % and the flux as high as 973.3 L m− 2 h− 1. Compared with commercial polytetrafluoro ethylene (PTFE) membrane, the advantage of the double-layer CFM/UiO-66(12)/PDMS membranes in separation flux was evident, which exhibited one order of magnitude higher than that of commercial PTFE membrane. The CFM/UiO-66(12)/PDMS membrane was acid-alkali tolerant, UV-aging resistant and reusable for emulsion separation. Notably, the CFM/UiO-66(12)/PDMS membrane was mechanically durable against strong mechanical abrasion, which was still capable of separating diverse water-in-oil emulsions after the abrasion with sandpaper and assembled as double-layer separation membranes. We anticipate that the combination of CFM and metal organic frameworks (MOFs) is an effective strategy for fabricating high-performance separation membrane with high mechanical and chemical durability. Note de contenu : - Materials - Synthesis of UiO-66 nanoparticles - Fabrication of the CFM/UiO-66(x)/PDMS membrane - Fabrication of the CFM/PDMS membrane - Preparation of water-in-oil emulsion - Emulsion separation of the CFM/UiO-66(x)/PDMS membrane - Chemical and mechanical durability - Characterization DOI : https://doi.org/10.1186/s42825-021-00060-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00060-5.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37544 [article]

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Anionic surfactant sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen by ultrasensitive microcalorimetry / Jie Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 6 p. Titre : Anionic surfactant sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen by ultrasensitive microcalorimetry Type de document : texte imprimé Auteurs : Jie Zhang, Auteur ; Chunhua Wang, Auteur ; Fengteng Zhang, Auteur ; Wei Lin, Auteur Année de publication : 2021 Article en page(s) : 6 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse conformationnelle Calorimétrie Collagène Stabilité thermique Surfactants Thermodynamique Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In this communication, sulfate dodecyl sodium (SDS)-induced thermodynamics and conformational changes of collagen were studied. We used ultrasensitive differential scanning calorimetry (US-DSC) to directly monitor the thermal transition of collagen in the presence of SDS. The results show that SDS affects the conformation and thermal stability of collagen very differently depending on its concentrations. At CSDS ≤ 0.05 mM, the enhanced thermal stability of collagen indicates the stabilizing effect by SDS. However, a further increase of SDS leads to the denaturation of collagen, verifying the well-known ability of SDS to unfold proteins. This striking difference in thermodynamics and conformational changes of collagen caused by SDS concentrations can be explained in terms of their interactions. With increasing SDS, the binding of SDS to collagen can be dominated by electrostatic interaction shifting to hydrophobic interaction, and the latter plays a key role in loosening and unfolding the triple-helix structure of collagen. The important finding in the present study is the stabilizing effect of SDS on collagen molecules at extreme low concentration. Note de contenu : - Experimental section : Materials - Sample preparation - Ultra-sensitive differential scanning calorimeter (US-DSC) measurements - The interaction between SDS and collagen by microcalorimetry DOI : https://doi.org/10.1186/s42825-021-00063-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00063-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37545 [article]

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Monitoring the mode of action of synthetic and natural biocides against Aeromonas hydrophila by Raman spectroscopy and chemometrics / Megha Mehta in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p. Titre : Monitoring the mode of action of synthetic and natural biocides against Aeromonas hydrophila by Raman spectroscopy and chemometrics Type de document : texte imprimé Auteurs : Megha Mehta, Auteur ; Yang Liu, Auteur ; Mark Waterland, Auteur ; Geoff Holmes, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aeromonas hydrophila Analyse multivariée Antimicrobiens Chimiométrie Cuirs et peaux -- Conservation Huile essentielle d'origan Inhibiteurs (chimie) Spectroscopie Raman Thiocyano-méthylthiobenzotiazole Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : We have investigated the mode of action of synthetic biocides, (2-(thiocyanomethylthio) benzothiazole(TCMTB), dichlorophen, (commonly used in leather industry for preservation) and natural biocides, oregano and eucalyptus oils, on Aeromonas hydrophila using Raman spectroscopy in collaboration with multivariate analysis and 2D correlation spectroscopy to evaluate whether Raman spectra acquired contained valuable information to study the action of biocides on bacterial cells. The growth of A. hydrophila in clear and outer edge zone of inhibition differ in their reaction with different biocides, which allows us to highlight the differences as a characteristic of two kinds of bacteria. Such classification helps identify oregano oil as the most effective biocide by altering clear and outer edge zone of bacteria. Standard disk diffusion assay method was used for screening biocide bacteria interactions and later analysed by Raman spectroscopy. The paper also presents the introduction of TCMTB and oregano oil into leather processing stages to examine and determine the antimicrobial effect as an application to real-world setting. Therefore, we conclude that Raman spectroscopy with appropriate computational tools constitutes a powerful approach for screening biocides, which provide solutions to all the industries using biocides including leather industry, considering the potentially harmful effect of biocides to humans and the environment. Note de contenu : - MATERIALS AND METHODS : Biocides and bacteria - Biocides, bacteria and leather treatment - Data acquisition and Raman spectral processing - RESULTS AND DISCUSSION : Disk diffusion agar plate test - Raman spectroscopy identifies biomolecular changes due to biocide treatment - Multivariate analysis - Two-dimensional correlation spectroscopy (2D-COS) - Antimicrobial effect of leather treated with biocides - Table 1 : Disk diffusion determined zones of inhibition (mm) for A. hydrophila strain after treatment with TCMTB, DCP, oregano oil and eucalyptus oil DOI : https://doi.org/10.1186/s42825-021-00062-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00062-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37546 [article]

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Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization / Yutang Zhou in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p. Titre : Strong synergistic effect of cationic hydrocarbon surfactant and novel nonionic tri-block short-chain fluorocarbon surfactant mixtures on surface activity, wettability and solubilization Type de document : texte imprimé Auteurs : Yutang Zhou, Auteur ; Yong Jin, Auteur ; Yichao Shen, Auteur ; Liangjie Shi, Auteur ; Shuangquan Lai, Auteur ; Yujia Tang, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Angle de contact Chimie des surfaces Colloides -- Stabilité Colorants Mélanges (chimie) Micelles Mouillabilité Polytétrafluoréthylène Solubilisation Surfactants Tension superficielle Thermochimie Transmittance La transmittance, en général, est le rapport caractérisant la transmission d'une grandeur dans un système. Elle se calcule par le rapport entre la grandeur en entrée et en sortie. En optique, la transmittance d'un matériau ou d'un filtre est la fraction du flux lumineux le traversant. Elle est également nommée facteur de transmission mais aussi transparence dans le domaine de la photographie. Index. décimale : 541.33 Chimie physique - Chimie des surfaces (Phénomènes superficiels) Résumé : Mixing hydrocarbon surfactants with fluorocarbon surfactants is still an important strategy to improve the economic benefits and performances of fluorocarbon surfactants and expand their range of application. Herein, we prepared a novel kind of hydrocarbon-fluorocarbon surfactant mixtures via mixing a cationic surfactant, cetyltrimethylammonium bromide (CTAB), with a tri-block nonionic short-chain fluorocarbon surfactant (F9EG13F9) in aqueous solution. The results showed that adding a small CTAB amount to F9EG13F9 (the molar fraction of CTAB in the mixture (x1) was 0.2) could greatly reduce its critical micelle concentrations (cmc) from 0.408 mmol/L to 0.191 mmol/L. At this x1, the contact angle of the mixture was the minimum (57.7 °) at 100 s on polytetrafluoroethylene film, which was even lower than that of F9EG13F9. Besides, CTAB/F9EG13F9 mixtures possessed better colloidal stability and solubilization ability toward hydrophobic dye (Sudan І) than F9EG13F9. The outstanding performances of binary surfactant mixtures benefited from the non-ideal mixing and strong synergistic effect evidence that CTAB/F9EG13F9 surfactant mixtures could be used in practical applications instead of individual F9EG13F9, thereby reducing the used cost of F9EG13F9. Note de contenu : - MATERIALS AND METHODS : Materials - Surface tension measurements - Conductivity measurements - Contact angle measurements - Transmittance measurements - Solubilization of hydrophobic dye - RESULTS AND DISCUSSION : Micellization behavior of binary mixtures - Adsorption behavior of binary mixtures - Thermodynamics of binary mixtures - Wettability of binary mixtures - Colloidal stability of binary mixtures - Solubilization of hydrophobic dye - Table 1 : Values of cmc and micellization parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 2 : Critical surface tension and adsorption parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 3 : Thermodynamic parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C - Table 4 : Solubilization parameters for CTAB/F9EG13F9 mixtures at different CTAB proportions at 25 °C DOI : https://doi.org/10.1186/s42825-021-00064-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00064-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37547 [article]

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Interaction mechanism of collagen peptides with four phenolic compounds in the ethanol-water solution / Xian Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 9 p. Titre : Interaction mechanism of collagen peptides with four phenolic compounds in the ethanol-water solution Type de document : texte imprimé Auteurs : Xian Liu, Auteur ; Xia Li, Auteur ; Zhangjun Huang, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2021 Article en page(s) : 9 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool Collagène Composés organiques volatils Dynamique moléculaire Eau Peptides Phénols Index. décimale : 547 Chimie organique : classer la biochimie à 574.192 Résumé : This study demonstrated the interaction mechanism of collagen peptides (CPs) with 4-ethylphenol (4-EP), phenol, guaiacol, and 4-ethylguaiacol (4-EG) in the ethanol-water solution. The ultraviolet visible spectroscopy, zeta potential tests and hydrogen nuclear magnetic spectroscopy manifested that CPs interacted with the phenolic compounds. Meanwhile, Isothermal titration calorimetry determination indicated that the CPs was hydrogen bonded with 4-EP in 52 %(v/v) ethanol-water solution, while the hydrophobic forces played a major role in the interaction of CPs with guaiacol and 4-EG, respectively. Moreover, hydrogen and hydrophobic bonds were involved in the interaction between CPs and phenol. Finally, Head Space-solid Phase Microextraction Gas Chromatography Mass Spectrometry analysis indicated that the content of phenolic compounds in model solution efficiently decreased with the presence of CPs. In the real liquor, it was found that the content of volatile compounds (including phenolic compounds) was obviously decreased after CPs added. Note de contenu : - MATERIALS AND METHODS : Material - UV-Vis measurements - Zeta potential determination - 1H NMR spectroscopy analysis - ITC detection - Solid-phase microextraction (SPME) - Gas chromatography-mass spectrometry (GC-MS) analysis - Statistics - RESULTS AND DISCUSSION : The Interaction between CPs and phenolic compounds in the ethanol-water solution - 1H NMR analysis - Thermodynamic parameters between CPs and phenolic compounds in the ethanol-water solution by ITC - The content of phenolic compounds in the ethanol-water solution - The content of volatile compounds in light-flavor types baijiu - Table 1 : Thermal parameters of collagen peptides reacted with phenolic compounds in 52 % ethanol-water solution - Table 2 : Effect of CPs on the content of phenolic compounds in the volatile components in 52 % ethanol-water solution as determined by HS-SPME-GC-MS - Table 3 : Effect of CPs on the content of volatile compounds in light-flavor types baijiu as determined by HS-SPME-GC-MS DOI : https://doi.org/10.1186/s42825-021-00065-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00065-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37548 [article]

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Preparation of aerogel and its application progress in coatings : a mini overview / Berhanu Telay Mekonnen in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 16 p. Titre : Preparation of aerogel and its application progress in coatings : a mini overview Type de document : texte imprimé Auteurs : Berhanu Telay Mekonnen, Auteur ; Wei Ding, Auteur ; Haiteng Liu, Auteur ; Song Guo, Auteur ; Xiaoyan Pang, Auteur ; Zhiwen Ding, Auteur ; Mohammed Hussein Seid, Auteur Année de publication : 2021 Article en page(s) : 16 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aérogels hydrocolloïdes Polymères Revêtements Silice La silice est la forme naturelle du dioxyde de silicium (SiO2) qui entre dans la composition de nombreux minéraux. La silice existe à l'état libre sous différentes formes cristallines ou amorphes et à l'état combiné dans les silicates, les groupes SiO2 étant alors liés à d'autres atomes (Al : Aluminium, Fe : Fer, Mg : Magnésium, Ca : Calcium, Na : Sodium, K : Potassium...). Les silicates sont les constituants principaux du manteau et de l'écorce terrestre. La silice libre est également très abondante dans la nature, sous forme de quartz, de calcédoine et de terre de diatomée. La silice représente 60,6 % de la masse de la croûte terrestre continentale. Sol-gel, Procédé Index. décimale : 667.9 Revêtements et enduits Résumé : Aerogels are predominantly mesoporous, extremely lightweight, low density (∼ 0.003 g/cm3) and thermally insulating materials. Over the years, aerogels have gained increasing attention due to their extraordinary properties (light, heat, sound, electricity and force) and application potentials in varieties of fields. Several studies have been carried out regarding aerogel preparation and its applications in coatings on different substrates. In this review, an overview of aerogels preparation and their application progress in coatings of most common substrates is presented. Attention is paid to aerogel coatings of textiles, leather, and substrates other than leather and textiles for special functionalities that could address the application progress in coatings. This review will help to inspire scientists and engineers towards novel aerogel materials and technologies to boost the industrial fabrication of flexible advanced materials. Note de contenu : - PREPARATION OF AEROGELS : Preparing the gel - Aging the gel - Drying the gel - COMMON AEROGELS : Silica-based aerogels - Polymer-based aerogels - Carbon aerogels - APPLICATION PROGRESS IN COATINGS : Aerogel coatings on textiles - Aerogel coatings on other substrates DOI : https://doi.org/10.1186/s42825-021-00067-y En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00067-y.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37549 [article]

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Preparation and assistant-dyeing of formaldehyde-free amphoteric acrylic retanning agent / Jian zhong Ma in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p. Titre : Preparation and assistant-dyeing of formaldehyde-free amphoteric acrylic retanning agent Type de document : texte imprimé Auteurs : Jian zhong Ma, Auteur ; Mengxin Wu, Auteur ; Zhenhua Tian, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Agents de tannage Colorants -- Propriétés tinctoriales Colorants acides Composés amphotériques Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux -- Propriétés organoleptiques Cuirs et peaux -- Propriétés physiques Cuirs et peaux -- Propriétés thermiques Cuirs et peaux -- Teinture Environnement -- Etudes d'impact Formaldéhyde Glutaraldéhyde Polyacryliques Retannage Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : With the enhancement of environmental protection consciousness, concerns have been raised about non-toxic and biodegradable leather retanning agents. According to the European standard 2002/231/EC, the free formaldehyde content of leather products should be less than 150 mg/kg. As one of the retanning agents in the market, the content of free formaldehyde in the Multifunctional retanning agent (MTA) is 372.22 mg/kg and higher than the limit value. In this work, glutaraldehyde as an alternative of formaldehyde was used to modify acrylic polymer and an amphoteric acrylic retanning agent was prepared. Then it was used in retanning process, and its retanning and assistant-dyeing properties were investigated. The results showed that the free formaldehyde content of amphoteric acrylic retanning agent modified with glutaraldehyde was only 4.17 mg/kg. Meanwhile, the presence of amino groups in the amphoteric acrylic retanning agent improved the dyeing properties of leather by electrostatic attraction. Compared with the leather treated with anionic acrylic retanning agent, the residual dye concentration of the dyeing effluent of the retanned leather with amphoteric acrylic retanning agent decreased from 17.4 mg/L to 10.0 mg/L, and the dyed leather had better resistances to friction and water-washing. In addition, the BOD5/COD value of the wastewater after Mannich base polymer retanning was only 0.32, indicating that the retanning agent was biodegradable. Moreover, the leather retanned with amphoteric acrylic retanning agent had good thermal stability, fullness and physical and mechanical properties. Note de contenu : - EXPERIMENTAL : Materials - Preparation of retanning agent - Application - Free formaldehyde content of leather - Free formaldehyde content of retanning agent - Leather surface color depth (K/S) - Color fastness to cycles of to-and-fro rubbing (wet/dry) - Color fastness to washing (discoloration) - Gain of leather - Physical-mechanical property - Softness - RESULTS AND DISCUSSION : Amination degree - 1H NMR spectra - FT-IR spectra - Analysis of molecular weight and molecular weight distribution - Zeta potential - Free formaldehyde content - Thermal properties - Dyeing properties - Physical-mechanical properties of leathers - Organoleptic properties of leathers - Environmental impact assessments - Table 1 : Specific operation of conventional and experimental processesa - Table 2 : GPC results of GAMP, MTA and P - Table 3 : The free formaldehyde contents of different retanning agents and corresponding retanned leathers - Table 4 : Blackness of leather before and after washing with soapy water five times and whiteness of wet and dry interlining cloths rubbed on the dyed leathers - Table 5 : Biochemical oxygen demand (BOD5) and Chemical oxygen demand (COD) of the wastewater after retanning DOI : https://doi.org/10.1186/s42825-021-00066-z En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00066-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37551 [article]

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Application of acidic protease in the pickling to simplify the pelt bating process / Xu Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 14 p. Titre : Application of acidic protease in the pickling to simplify the pelt bating process Type de document : texte imprimé Auteurs : Xu Zhang, Auteur ; Mengchu Gao, Auteur ; Sadaqat Ali Chattha, Auteur ; Yiwen Zhu, Auteur ; Biyu Peng, Auteur ; Yongbin Ye, Auteur Année de publication : 2021 Article en page(s) : 14 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse. Croûte (cuir) On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés. Cuirs et peaux Peptidases Picklage Le picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu. Trypsine La trypsine (EC 3.4.21.4) est une enzyme digestive du suc pancréatique qui a pour rôle de digérer les protéines. Elle est synthétisée par le pancréas sous forme de trypsinogène (proenzyme inactive), puis stockée dans les vésicules enzymatiques des cellules acineuses d'où elle est excrétée au moment de la digestion. L'activation du trypsinogène en trypsine est le résultat de l'hydrolyse d'un propeptide sous l'action de l'entérokinase ou par un effet d'autoactivation de la trypsine par elle-même. La cholecystokinine-pancréozymine active la sécrétion des enzymes (donc de la trypsine) dans le suc pancréatique. La trypsine est une endoprotéase qui hydrolyse les liaisons peptidiques dans lesquelles un acide aminé basique (Lys-|-Xaa ou Arg-|-Xaa) engage sa fonction acide (sauf dans le cas où l'acide aminé suivant (schématisé ici par "Xaa") est une Proline). Elle coupe en C-terminal de ces acides aminés. En d'autres mots, elle transforme les chaînes polypeptides en chaînes protéiques plus courtes pour permettre la digestion. Efficace à pH 7,5 - 8,5, elle est inactivée et digérée en quelques heures à pH neutre (=7) dans l'intestin. La trypsine participe à l'activation d'autres enzymes comme l'alpha-chymotrypsine par coupure hydrolytique de la chaîne polypeptidique du chymotrypsinogène. Cette enzyme sert également lors de la 2e semaine du développement embryonnaire humain. Elle est sécrétée par le trophoblaste afin de digérer la zone pellucide entourant le blastocyste. Ce phénomène s'appelle l'éclosion. Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Traditionally, universally used pelt bating technologies rely on the application of trypsin, neutral and alkaline microbial proteases but suffer from complicated operation, limited bating efficiency and unsatisfactory leather performance. Therefore, devising a new pelt bating approach to achieve high bating efficiency and excellent leather performance has always been wished for by the leather industry. To pursue this goal, years of persistent research work enabled us to develop a novel approach for pelt bating by means of acidic proteases in pickling process. Initially, basic enzymatic characteristics and bating effectiveness of several typical acidic proteases in pelt pickling medium were investigated; then, the bating effectiveness through the quantitative characterization of protease activity of the optimal acidic protease was compared with that of the conventional bating enzyme. The results indicated that all of the selected acidic proteases had good salt-tolerance and exhibited optimum activity at pH 3.0–4.0. The novel pickling-bating method based on microbial origin acidic protease L80A led to an outstanding performance on pelt bating at the dosage of 150 U/mL of collagenolytic activity. The bating effectiveness of acidic protease L80A was comparable to and even better than that of trypsin BEM due to its moderate proteolytic ability. Moreover, the deep and even penetration of acidic protease in the pelt permitted it to produce soft, organoleptically stable and overall better quality crust leather than that of the conventional trypsin bating method. Additionally, pelt bating was performed along with the pickling process without extra inactivation and washing operation, making the bating operation more efficient, economical, and environment friendly. Results had made us to conclude that this cutting-edge acidic proteases based pickling-bating method could be the first step/ way forward to replace the decades-old traditional pelt bating technology. Note de contenu : - MATERIALS AND METHODS : Materials - Assay of proteolytic activity on casein substrate - Assay of proteolytic activity on collagen fiber substrate - Effect of salt concentration on the collagenolytic activity of acidic proteases - Bating pickling pelt with typical proteases - Comparison of the bating effectiveness of acidic protease L80A and trypsin BEM - Determination of soluble protein (SP) concentration in bating liquor - Determination of hydroxyproline concentration in bating liquor - Determination of chromium content in spent tanning liquors and wet blue - Histological analysis of collagen and elastin fiber - Scanning electron microscopy (SEM) analysis - Test of softness and physical properties of crust leather - RESULTS : Proteolytic characteristics of typical acidic proteases - Comparison bating effectiveness of different acidic proteases in pickling process - Relationship between collagenolytic activity and bating effect of pickling pelts - Comparison of bating effectiveness of the novel pickling-bating and conventional trypsin bating method - Table 1 The selected proteases - Table 2 Enzymatic characteristics of acidic proteases (25 ℃, pH 3.5) - Table 3 Amounts of proteases, soluble protein, hydroxyproline in the bating liquor and the softness of crust leather treated by the same dosage of caseinolytic activity (25℃, pH 3.5) - Table 4 Amounts of proteases, soluble protein, hydroxyproline in the bating liquor and the softness of crust leather treated by the same dosage of collagenolytic activity (25℃, pH 3.5) - Table 5 Relation of the softness and physical properties of the crust leathers to the collagenolytic activity of protease L80A (25℃, pH 3.5) - Table 6 Amounts of protease and testing results of the effluents and crust leathers DOI : https://doi.org/10.1186/s42825-021-00068-x En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00068-x.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37552 [article]

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Facile and scalable preparation of ZIF-67 decorated cotton fibers as recoverable and efficient adsorbents for removal of malachite green / Linhua Li in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 15 p. Titre : Facile and scalable preparation of ZIF-67 decorated cotton fibers as recoverable and efficient adsorbents for removal of malachite green Type de document : texte imprimé Auteurs : Linhua Li, Auteur ; Rui Zou, Auteur ; Jianwu Lan, Auteur ; Jiaojiao Shang, Auteur ; Baojie Dou, Auteur ; Hongyu Liu, Auteur ; Shaojian Lin, Auteur Année de publication : 2021 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Absorbants et adsorbants Colorants -- Adsorption Colorants -- Elimination Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Décoloration Eaux usées -- Epuration Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Recently, metal–organic frameworks (MOFs) have received considerable attention as highly efficient adsorbents for dye wastewater remediation. However, the immobilization of MOFs on the substrate surfaces to fabricate easy recyclable adsorbents via a facile route is still a challenge. In this work, ZIF-67/cotton fibers as adsorbents for dye removal were prepared in a large-scale using a simple coordination replication method. The successful fabrication of the ZIF-67/cotton fibers was confirmed by FTIR, XRD, XPS, SEM and BET analysis, respectively. As expected, the as-prepared ZIF-67/cotton fibers exhibited high adsorption capacity of 3787 mg/g towards malachite green (MG). Meanwhile, the adsorption kinetics and isotherm obeyed the pseudo-second-order kinetics and Langmuir model, respectively. Moreover, its removal efficiency towards MG was not significantly influenced by the pH and ionic strength of aqueous solution. Most importantly, the ZIF-67/cotton fibers can remove MG from synthetic effluents, and it can be easily regenerated without filtration or centrifugation processes, with the regeneration efficiency remaining over 90% even after 10 cycles. Additionally, the ZIF-67/cotton fibers presented excellent antimicrobial performance against E. coli and S. aureus. Hence, the distinctive features of the as-prepared ZIF-67/cotton fibers make it promisingly applicable for the colored wastewater treatment. Note de contenu : - EXPERIMENTAL SECTION : Materials - Preparation of ZIF-67/cotton fibers - Characterization - MG adsorption experiments - Adsorption of synthetic effluents - Evaluation of antibacterial activity - RESULTS AND DISCUSSION : Chemical composition of ZIF-67/cotton fibers - Surface morphology of ZIF-67/cotton fibers - Surface area of ZIF-67/cotton fibers - Adsorption kinetics - Adsorption isotherm - Effect of ionic strength on the adsorption capacity - Effect of pH on the adsorption capacity - Adsorption mechanism - Recyclability - Dynamic adsorption - Adsorption of synthetic dye effluent - Antibacterial activity - Table 1 : Chemical composition of the synthetic effluent - Table 2 : Comparison of the adsorption capacity of the ZIF-67/cotton fibers towards MG with other adsorbents DOI : https://doi.org/10.1186/s42825-021-00069-w En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00069-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37553 [article]

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Evaluation and improvement of the oxidative stability of leather fatliquors / Yue Yu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : Evaluation and improvement of the oxidative stability of leather fatliquors Type de document : texte imprimé Auteurs : Yue Yu, Auteur ; Min Huang, Auteur ; Jiaqi Lv, Auteur ; Zeng Yunhang, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antioxydants Essais accélérés (technologie) Huiles et graisses Produits de nourriture du cuir Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Fatliquor oxidation may give leather unpleasant odor, and excessive amounts of Cr(VI) and volatile organic compounds. The accurate evaluation and improvement of the oxidative stability of fatliquors are of great significance to high-quality leather manufacturing. We proposed a set of practical methods for evaluating the oxidative stability of fatliquors on the basis of oxidation induction time, change in iodine value (∆ IV), and change in acid value (∆ AV) under accelerated oxidation conditions (at 100 °C with 10 L/h of air). Oxidation induction time is a highly sensitive marker for quantifying the oxidative stability of fatliquors, and ∆ IV and ∆ AV that are low cost and easy to operate are useful in evaluating the oxidative stability of fatliquors when the oxidation induction time is less than 22 h. The number of double bonds in fatliquors is an important factor affecting oxidative stability. The sulfation modification of fatliquors that greatly reduces double bonds and the addition of antioxidants, especially butylated hydroxyanisole and butylated hydroxytoluene, markedly improve oxidative stability of fatliquors. Note de contenu : - MATERIALS AND METHODS : Materials - Accelerated oxidation tests for fatliquors - Attenuated total reflection Fourier transform infrared spectrum of modified rape oils - Accelerated oxidation tests for modified rape oils - Accelerated oxidation tests for sulfated rape oil with antioxidants - RESULTS AND DISCUSSION : Establishment of methods for evaluating the oxidative stability of fatliquors - Effect of modification method on the oxidative stability of fatliquors - Effect of antioxidant on the oxidative stability of fatliquors DOI : https://doi.org/10.1186/s42825-021-00070-3 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00070-3.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37554 [article]

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Quantitative extraction of chromium VI and III from tanned leather : a comparative study of pretreatment methods / Mónica Gisel Arellano-Sánchez in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 13 p. Titre : Quantitative extraction of chromium VI and III from tanned leather : a comparative study of pretreatment methods Type de document : texte imprimé Auteurs : Mónica Gisel Arellano-Sánchez, Auteur ; Christine Devouge-Boyer, Auteur ; Marie Hubert-Roux, Auteur ; Carlos Afonso, Auteur ; Mélanie Mignot, Auteur Année de publication : 2021 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chrome hexavalent Complexes métalliques Cuir Ethylène diamine tétra acétique L'EDTA (Ethylène Diamine Tétra Acétique), ou acide éthylène diamine tétraacétique, est un acide diaminotétracarboxylique de formule C10H16N2O8. L'EDTA comporte six sites basiques, quatre correspondant aux bases conjuguées (carboxylates) des fonctions carboxyliques et deux correspondant aux fonctions amines. Ces sites basiques sont également des centres ligands, faisant de l'EDTA un ligand hexadentate (ou parfois tétradentate, lorsque seuls les sites carboxyliques sont utilisés). C'est d'ailleurs sa principale caractéristique, son fort pouvoir chélatant (ou complexant) par lequel il forme des complexes métalliques très stables, ce qui en fait un traitement en cas d'intoxication aux métaux lourds comme le plomb, avec une concentration adaptée (Voir Applications et chélation). Dans les complexes, l'EDTA est lié aux cations métalliques sous la forme d'une de ses bases conjuguées9. Extraction (chimie) Spéciation (chimie) Technique des plasmas Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In this study, seven pretreatment methods for chromium speciation in tanned leather were evaluated: acidic mineralization, ethylenediaminetetraacetic acid (EDTA) extraction, diethylenetriaminepentaacetic acid (DTPA) extraction, alkaline extraction (NH4OH), ammonium nitrate extraction (NH4NO3), water extraction, and phosphate buffer extraction. Acidic mineralization permitted the decomposition of the organic matter and ensured the complete digestion of leathers, giving access to the total content of chromium in each sample using inductively coupled plasma-atomic emission spectrometry (ICP-AES). From all the extractant media tested, EDTA proved to be the most efficient, allowing the extraction of Cr(VI) and Cr(III) as a Cr(III)-EDTA complex, quantitatively. Method validation is presented for EDTA extraction and direct mineralization. For the EDTA extraction, method detection limit (MDL) and method quantification limit (MQL) for total Cr in leather were 3.4 ppb and 11.2 ppb (µg of total Cr per L of extraction solution), respectively. Due to the lack of leather certified reference materials (CRMs) for Cr(VI), accuracy was evaluated by spiking leather samples with a Cr(VI) solution. The spike recovery of EDTA microwave assisted extraction ranged from 91.0 to 108.6%. Interday precision was also evaluated and all variation coefficients were below 5%, for both mineralization and EDTA extraction. This article provides an efficient procedure to extract quantitatively chromium from leather, while maintaining the speciation, which can be further followed by ion chromatography-inductively coupled plasma-mass spectrometry (IC-ICP-MS). Note de contenu : - EXPERIMENTAL : Instrumentation - Materials - Total chromium determination - Sample preparation - Mineralization (or acidic digestion) - EDTA extraction - DTPA extraction - Alkaline extraction - Ammonium nitrate extraction - Water extraction - Phosphate buffer extraction - Sample spiking - Speciation by IC-ICP-MS - RESULTS AND DISCUSSION : Evaluation of different pretreatment methods - Validation of the method - Speciation by IC-ICP-MS - Table 1 : Pretreatment and determination methods for hexavalent chromium in leather samples - Table 2 : Optimized operating conditions for ICP-AES and ICP-MS - Table 3 : Extraction rates of different pretreatment methods. Comparison between direct mineralization and : a EDTA extraction ; b DTPA extraction ; c NH4OH extraction ; d NH4NO3 extraction ; e water extraction ; f phosphate buffer extraction ; 3 different samples were analyzed each day - Table 4 : Interday precision of: a direct mineralization ; b EDTA extraction. 3 different samples were analyzed each day - Table 5 : Spike recovery for : a direct mineralization ; b EDTA extraction DOI : https://doi.org/10.1186/s42825-021-00071-2 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00071-2.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37555 [article]

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A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans / Qingyong Sun in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 10 p. Titre : A deeper exploration of the relation between sulfonation degree and retanning performance of aromatic syntans Type de document : texte imprimé Auteurs : Qingyong Sun, Auteur ; Yunhang Zeng, Auteur ; Ya-Nan Wang, Auteur ; Yue Yu, Auteur ; Bi Shi, Auteur Année de publication : 2021 Article en page(s) : 10 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Composés aromatiques Dynamique moléculaire Pénétration (physique) Précipitation (chimie) Retannage Simulation, Méthode de Sulfonation Syntans Tannage synthétique Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : It is well-known that the sulfonation degree (DS) of aromatic syntan is an important factor affecting its retanning performances. But the quantitative relation between DS and syntan property and the influencing mechanism of DS on syntan property are not clarified. In this work, five phenolic formaldehyde syntans (PFSs) with the same polymerization degree but varying DS were prepared to investigate the effect of DS on the properties of syntan and crust leather. It was found that the absolute value of zeta potential and the particle size of PFS decreased with increasing DS in aqueous solution. Molecular dynamic simulation results proved that the DS of PFS was a major contributor to electrostatic interaction and hydrogen bonding in the PFS–water system and greatly affected the aggregation and dispersion of PFS in aqueous solution. The PFS with a low DS was prone to aggregate to large particles in aqueous solution because of low intermolecular electrostatic repulsion and less hydrogen bonds and therefore can be used to increase the thickness and tightness of leather. The PFS with a high DS presented a small particle size with more anionic groups in aqueous solution, thereby sharply decreasing the positive charge of leather surface and facilitating the penetration of the post-tanning agents into the leather. These results might be scientifically valid for rational molecular design of syntans and more productive use of syntans in leather making. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of PFSs with different DSs - Determination of DS of PFS - Determination of zeta potential and particle size of PFS - MD simulation - Retanning and fatliquoring - Determination of zeta potential and pIs of retanned leather - Analysis of PFS penetration in leather - Determination of uptake rate of PFS by leather - Determination of thickness increase rate of leather - Determination of leather softness - RESULTS AND DISCUSSION : Effect of DS on zeta potential and particle size of PFS - Effect of DS of PFS on pI of retanned leather - Effect of DS on penetration of PFS in retanned leather - Effect of DS on uptake of PFS by leather - Effect of DS of PFS on thickness and softness of crust leather - Table 1 : Simulation details - Table 2 : Retanning process - Table 3 : Retanning and fatliqouring processes DOI : https://doi.org/10.1186/s42825-021-00073-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00073-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37556 [article]

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Sweet sorghum for phytoremediation and bioethanol production / Ming-Zhao Xiao in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 23 p. Titre : Sweet sorghum for phytoremediation and bioethanol production Type de document : texte imprimé Auteurs : Ming-Zhao Xiao, Auteur ; Qian Sun, Auteur ; Si Hong, Auteur ; Wei-Jing Chen, Auteur ; Bo Pang, Auteur ; Zhi-Yan Du, Auteur ; Wen-Bin Yang, Auteur ; Zhuohua Sun, Auteur ; Tong-Qi Yuan, Auteur Année de publication : 2021 Article en page(s) : 23 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bioéthanol cadmium Le cadmium est un élément chimique de symbole Cd et de numéro atomique 48. Le cadmium est un métal blanc argenté ayant des propriétés physiques proches de celle du zinc. Il fond à 320,9 °C et bout à 767 °C. Lors de l'ébullition du cadmium, il se dégage des vapeurs jaunes toxiques. Sa masse spécifique est de 8 650 kg/m³. Il est ductile (capacité à l’étirement), malléable (capacité à la mise en forme) et résiste à la corrosion atmosphérique, ce qui en fait un revêtement de protection pour les métaux ferreux. Les propriétés chimiques du cadmium sont semblables à celles du zinc. L'ion cadmium est déplacé par le zinc métallique en solution : il est moins réactif que le zinc. Il s'oxyde très peu à température ambiante et brûle dans l'air en donnant l'oxyde anhydre CdO, insoluble dans un excès d'hydroxyde de sodium. Il réagit avec les acides et les bases. Le cadmium est soluble dans l'acide nitrique dilué et dans les acides chlorhydrique et sulfurique concentrés et chauds. La masse molaire atomique du Cadmium est de 112,4 g/mol. Chrome hexavalent Déchets -- Elimination Phytoremédiation Sols -- Décontamination Sorgho et constituants Index. décimale : 628.53 Pollution de l'air et lutte antipollution Résumé : As an energy crop, sweet sorghum (Sorghum bicolor (L.) Moench) receives increasing attention for phytoremediation and biofuels production due to its good stress tolerance and high biomass with low input requirements. Sweet sorghum possesses wide adaptability, which also has high tolerances to poor soil conditions and drought. Its rapid growth with the large storage of fermentable saccharides in the stalks offers considerable scope for bioethanol production. Additionally, sweet sorghum has heavy metal tolerance and the ability to remove cadmium (Cd) in particular. Therefore, sweet sorghum has great potential to build a sustainable phytoremediation system for Cd-polluted soil remediation and simultaneous ethanol production. To implement this strategy, further efforts are in demand for sweet sorghum in terms of screening superior varieties, improving phytoremediation capacity, and efficient bioethanol production. In this review, current research advances of sweet sorghum including agronomic requirements, phytoremediation of Cd pollution, bioethanol production, and breeding are discussed. Furthermore, crucial problems for future utilization of sweet sorghum stalks after phytoremediation are combed. Note de contenu : - CHARACTERISTICS AND GROWTH CONDITIONS : Characteristics - Agronomic requirements - PHYTOREMEDIATIONOF CD POLLUTION : Physiological and biochemical responses, and the Cd accumulation mechanisms under Cd stress - Cd Phytoremediation capacity - Promoting Cd removal - Characteristics of sweet sorghum in Cd phytoremediation - Potential bioethanol yield of sweet sorghum under Cd stress - BIOETHANOL PRODUCTION FROM SSS : Soluble sugars to bioethanol - SSB to bioethanol - Stalk to bioethanol - SCREENING AND BREEDING OF IDEOTYPES - Table 1 : Experiments relating to the sweet sorghum phytoremediation - Table 2 : Summary of literatures on sweet sorghum juice fermentation - Table 3 : Chemical pretreatment and bioethanol fermentation of SSB DOI : https://doi.org/10.1186/s42825-021-00074-z En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00074-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37557 [article]

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Sustainable and invisible anti-counterfeiting inks based on waterborne polyurethane and upconversion nanoparticles for leather products / Jun Xiang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 3 (Année 2021)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 3 (Année 2021) . - 11 p. Titre : Sustainable and invisible anti-counterfeiting inks based on waterborne polyurethane and upconversion nanoparticles for leather products Type de document : texte imprimé Auteurs : Jun Xiang, Auteur ; Jianxun Lin, Auteur ; Zhonghui Wang, Auteur ; Shenglin Zhou, Auteur ; Zhenya Wang, Auteur ; Qiang Yan, Auteur ; Yidong Liu, Auteur ; Haojun Fan, Auteur Année de publication : 2021 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Contrefaçon -- Lutte contre Cuir Encre en phase aqueuse Mesures biophysiques Nanoparticules Polyuréthanes Produits commerciaux -- Contrefaçon Rayonnement infrarouge Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Counterfeit leather products infringe the intellectual property rights of the business, cause enormous economic loss, and negatively influence the business enthusiasm for innovation. However, traditional anti-counterfeiting materials for leather products suffer from complicated fabrication procedures, photobleaching, and high volatile organic compound (VOC) emissions. Here, a sustainable and invisible anti-counterfeiting ink composed of waterborne polyurethane and water-dispersible lanthanide-doped upconversion nanoparticles (UCNPs) featuring ease of preparation, high photostability, non-toxicity, low VOC emissions, and strong adhesion strength for leather products is designed and synthesized. After decorating on the surface of leather products, the obtained patterns are invisible under normal light conditions. Upon irradiation at 808 nm, the invisible patterns can be observed by naked eyes due to the visible light emitted by 808 nm excited UCNPs. Our approach described here opens a new pathway to realize the long-term, stable anti-counterfeiting function of leather products. Note de contenu : - MATERIALS AND METHODS : Materials - Experimental methods - Measurements - RESULTS AND DISCUSSION : OA-UCNPs nanoparticles - PVP-UCNPs nanoparticles - The WPU dispersion - The sustainable and invisible ACI - Application DOI : https://doi.org/10.1186/s42825-021-00076-x En ligne : https://link.springer.com/content/pdf/10.1186/s42825-021-00076-x.pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37558 [article]

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