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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Corrosion resistance of a self-curing waterborne epoxy resin coating / Gongwen Tang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 3 (05/2019) . - p. 895-904 Titre : Corrosion resistance of a self-curing waterborne epoxy resin coating Type de document : texte imprimé Auteurs : Gongwen Tang, Auteur ; Ting Ting Ren, Auteur ; Zhishan Yan, Auteur ; Linrong Ma, Auteur ; Xianhui Pan, Auteur ; Xiangyu Hou, Auteur ; Xin Huang, Auteur Année de publication : 2019 Article en page(s) : p. 895-904 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Anticorrosifs Anticorrosion Auto-réticulation Caractérisation Diisopropoxyde bisacétylacétonate de titane Epoxydes Résistance chimique Revêtements -- Propriétés physiques Revêtements -- Propriétés thermiques Revêtements organiques Revêtements protecteurs Spectroscopie d'impédance électrochimique Index. décimale : 667.9 Revêtements et enduits Résumé : Waterborne coatings have gained more and more attention as a method to protect the environment. However, the application of waterborne coatings to metals, especially for sufficient long-term protection in harshly corrosive environments, is still limited. Here, we report a self-curing waterborne coating with good corrosion resistance. First, a self-curing waterborne epoxy resin (SWEP) was synthesized by a chemical reaction between the epoxy resin and titanium diisopropoxide bisacetylacetonate in water. The structural characterizations via Fourier transform infrared spectroscopy and 13C nuclear magnetic resonance spectrsocopy confirmed the successful preparation of the SWEP resin. Differential scanning calorimetry and thermogravimetric analysis showed that the SWEP resin could be cured by heating without the use of any curing agents, and the cured coating exhibited good thermal resistance. The mechanical properties of the cured coatings were discussed in the context of the corresponding standards. The results confirmed that the physical properties of the SWEP coating were as good as those of a traditional two-component waterborne epoxy resin (DCWEP) coating. The chemical resistance analysis revealed that the water, acid and alkaline resistances of the SWEP coating all have significant improvements compared to those of the DCWEP coating. The electrochemical impedance spectroscopy and potentiodynamic polarization test implied that the SWEP coating provided better corrosion protection for metal substances than the DCWEP coating. Note de contenu : - MATERIALS AND METHODS : Materials - Preparation of the self-curing waterborne epoxy resin - Preparation of SWEP coatings - Characterization - RESULTS AND DISCUSSION : Synthesis of the SWEP coating - Thermal properties - Physical properties - Chemical resistance - Electrochemical impedance spectroscopy (EIS) DOI : 10.1007/s11998-018-00166-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-00166-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32600 [article]

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Self-driven directional dehydration enabled eco-friendly manufacture of chrome-free leather / Yawen Huang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 4 (Année 2022)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 4 (Année 2022) . - 12 p. Titre : Self-driven directional dehydration enabled eco-friendly manufacture of chrome-free leather Type de document : texte imprimé Auteurs : Yawen Huang, Auteur ; Hanzhong Xiao, Auteur ; Haoliang Pu, Auteur ; Ni Xue, Auteur ; Baicun Hao, Auteur ; Xin Huang, Auteur ; Bi Shi, Auteur Année de publication : 2022 Article en page(s) : 12 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alcool Caractérisation Déshydratation Peaux brutes -- Teneur en eau Tannage chrome free Zéolites Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Manufacture of eco-friendly chrome-free leather is of great significance for realizing sustainable development of leather industry. Conventional tanning theory believes that it is impossible to convert raw hide to leather without the utilization of cross-linking agent (e.g., chrome salts) among collagen fibers in raw hide. Here, we developed a brand-new leather manufacture strategy that relied on the composite dehydration media enabled self-driven directional dehydration mechanism to accomplish chrome-free leather manufacture for the first time, rather than followed the classic cross-linking mechanism that has been obeyed for more than one century in leather industry. We demonstrated that the essence of leather making is to regulate the water content in raw hide rather than to form cross-linkage among collagen fibers. The composite dehydration media comprised of anhydrous ethanol and molecular sieves (3A activated zeolite powder) successfully guaranteed continuous self-driven directional dehydration of raw hide by establishing stable water concentration gradient between raw hide and ethanol, which significantly increased the dispersity of collagen fibers in raw hide (with the water content reduced from 56.07% to 5.20%), thus obtaining chrome-free leather that is more ecological than chrome-tanned leather due to the elimination of any tanning agent. The as-prepared chrome-free leather exhibited outstanding tear force (174.86 N), tensile strength (24.56 N mm−2), elongation at break (53.28%) and dry-thermal stability, superior to chrome-tanned leather. Notably, the used composite dehydration media was recyclable for chrome-free leather manufacture, therefore facilitating an environmentally benign leather manufacture process. Our investigations are expected to open up a new conceptual leather making strategy that is applicable for realizing substantial manufacture of eco-friendly leather. Note de contenu : - Materials - Preparation of eco-friendly chrome-free leather - Dehydration of raw hide using anhydrous ethanol - Preparation of chrome-tanned leather - Selective adsorption of 3A activated zeolite powder to water from the water-ethanol mixture - Characterization DOI : https://doi.org/10.1186/s42825-022-00089-0 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-022-00089-0.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37582 [article]

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The further investigation of tanning mechanisms of typical tannages by ultraviolet-visible and near infrared diffused reflectance spectrophotometry / Junling Guo in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 7 (07/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 7 (07/2011) . - p. 226-231 Titre : The further investigation of tanning mechanisms of typical tannages by ultraviolet-visible and near infrared diffused reflectance spectrophotometry Type de document : texte imprimé Auteurs : Junling Guo, Auteur ; Xin Huang, Auteur ; Chao Wu, Auteur ; Xuepin Liao, Auteur ; Bi Shi, Auteur Année de publication : 2011 Article en page(s) : p. 226-231 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alun Glutaraldéhyde Groupement carboxyle Spectrométrie infrarouge Spectrophotométrie UV-Visible Spectroscopie de réflectance Sulfate d'aluminium Sulfate de chrome Sulfate de fer Sulfate de titane Sulfate de zirconium Tannage Tannage végétal Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The ultraviolet-visible and near-infrared diffuse reflection (UV-Vis-NIR DR) spectroscopy was employed for further understanding the mechanisms of three kinds of classical tannages, including aldehyde tanning, vegetable tanning and mineral tanning. The NIR DR spectra of glutaraldehyde tanned leather exhibited a decreased peak intensity of amino group at 1475 nm, suggesting that the main reaction groups of collagen in aldehyde tanning are amino groups. Comparing the NIR DR spectra of pickled pelt and vegetable tanned leather, it was proved that the vegetable tanning is based on the mechanism of multiple hydrogen bonding interaction, where the amino groups, carboxyl groups and peptide chains are involved. As for mineral tannages, the tanning mechanisms of chromium sulfate, zirconium sulfate, ferrum sulfate, titanium sulfate and aluminum sulfate were investigated. Based on UV-Vis-NIR DR analysis in the wavelength range of 200 to 2070 nm, it was confirmed that the main reactions involved in mineral tanning are the chelating interactions of metal ions with both the carboxyl groups and the amino groups of collagen, although the reactivity of metal salts toward carboxyl groups is higher than toward amino groups. The reactivity of metal salts toward carboxyl groups of collagen follows the sequence of chromium salt > zirconium salt > ferrum salt > titanium salt > aluminum salt. However, the reactivity of metal salts to amino groups of collagen is in the sequence of zirconium salt > chromium salt > ferrum salt > titanium salt > aluminum salt. Meanwhile, the peptide chain of collagen was also found to play an important role in fixation of metal ions during tanning process. Note de contenu : EXPERIMENTAL : Preparation of leather samples - UV-Vis-NIR DR determinations. RESULTS AND DISCUSSION : Comparison and analysis of DR spectra of CF, GA-CF and BT-CF - Comparison and analysis of DR spectra of metal salts tanned leathers. En ligne : https://drive.google.com/file/d/1XMCv5rwTd7b_YqA_uIwFpuqj1DFNGr8M/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12032 [article]

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