![](./images/home.jpg)
![](./images/bar_spacer.gif)
Catégories
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
Etendre la recherche sur niveau(x) vers le bas
Phytochemical screening and determination of tannin content of compounds from acacia xanthophloea as viable tanning agents for the leather industry / Michael Cheloti in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 106, N° 5 (09-10/2022)
![]()
[article]
Titre : Phytochemical screening and determination of tannin content of compounds from acacia xanthophloea as viable tanning agents for the leather industry Type de document : texte imprimé Auteurs : Michael Cheloti, Auteur ; Wangila Phanice, Auteur ; Kiprop Ambrose, Auteur ; Arthur Onyuka, Auteur ; Derese Solomon, Auteur ; Wekesa Ingrid, Auteur ; Sasia Alvin, Auteur ; Mukavi Justus, Auteur Année de publication : 2022 Article en page(s) : p. 218-233 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acacia et constituants
Agents de tannage
Caractérisation
Chimie végétale
Criblage
Phénols
Tanins végétauxIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Acacia xanthophloea species, a tropical plant and a member of the Fabacea family is a ubiquitous and native shrub of the Eastern and Southern Africa regions. Although plant species in the Fabacea family are known as a source of tannins, very little is known about their phytochemistry. This study aimed at determining the suitability of Acacia xanthophloea as a viable tanning agent for the leather industry. The crude extract of Acacia xanthophloea was phytochemically screened using a series of qualitative tests while the total phenolic content and tannin content of the Acacia crude extract was determined spectrophotometrically using the Folin-Ciocalteu method. The functional groups of the compounds in the crude extract were determined using FTIR while Scanning Electronic Microscopy (SEM) was used to determine the surface morphological changes that take place during the tanning process. Results of phytochemical screening indicated the presence of: alkaloids, glycosides, flavonoids, phenolic compounds and saponins. Total phenolic content at 249.1mg TAE/g and total tannin content at 39.8mg TAE/g (16%) is reported. The results of this study indicate that the organic extract of Acacia xanthopholea could be a good source of tannins for leather tanning. Note de contenu : - METHODS : Sample collection - Sample preparation and extraction - Phytochemical screening - Total phenolic content - Tannin content - Fourier transform infrared spectroscopy (FTIR) characterisation - SEM analysis
- RESULTS AND DISCUSSION : Phytochemical screening - Tannin content (TPC) - FTIR characterisation of the crude extract - Scanning electronic microscope (SEM) analysis
- Table 1 : Summary of the test for the phytochemicals, observations and the results
- Table 2 : Total phenolic content, total non-tannin content and total tannin content
- Table 3 : Shows attributes of FTIR spectra acquired for bark crude extract of Acacia xanthophloeaEn ligne : https://drive.google.com/file/d/14IkrqSFxaH65b7xkokAtUw1zSBuEyZhf/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38197
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 106, N° 5 (09-10/2022) . - p. 218-233[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23641 - Périodique Bibliothèque principale Documentaires Disponible Piezoresistive characterization of graphene/metakaolin-based geopolymeric mortar composites / Caterina Lamuta in JEC COMPOSITES MAGAZINE, N° 126 (01-02/2019)
![]()
[article]
Titre : Piezoresistive characterization of graphene/metakaolin-based geopolymeric mortar composites Type de document : texte imprimé Auteurs : Caterina Lamuta, Auteur ; Luigi Bruno, Auteur ; Sebastiano Candamano, Auteur ; Leonardo Pagnotta, Auteur Année de publication : 2019 Article en page(s) : p. 62-65 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Caractérisation
GéopolymèresLes géopolymères sont la réciproque des polymères organiques. À la place de dérivés du pétrole et de la chaîne carbonée, on utilise de la matière minérale composée de silice et d’alumine.
Les géopolymères sont basés sur des alumino-silicates désignés sous le terme poly(sialate), qui est une abréviation de poly(silico-oxo-aluminate) ou (-Si-O-Al-O-)n (soit n le degré de polymérisation). La structure chimique de la Figure 1 montre un géopolymère poly(sialate-siloxo) résultant d'une géosynthèse de poly(silisique) acide (SiO2)n et de potassium alumino-silicate, en milieu alcalin (KOH, NaOH). Dans cette structure, le groupement sialate (Si-O-Al-O-) est un agent de réticulation.
On pense que le mécanisme de la synthèse géochimique se fait par l'intermédiaire d'oligomères (dimère, trimère) qui constituent les véritables groupements structuraux unitaires formant une structure macromoléculaire tridimensionnelle.
GraphèneLe 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.
Kaolin
Matériaux piézoélectriques
Mortier
Nanoparticules
PiézorésistanceLa piézorésistance est le changement de résistance électrique d'un matériau dû à une contrainte mécanique.
Résistance électriqueIndex. décimale : 668.4 Plastiques, vinyles Résumé : Geopolymers are recently developed ceramic materials produced by alkaline activation of thermally activated natural materials such as metakaolin. Due to their promising application in the field of structural components, the presence of a piezoresistive affect is a very useful property for such materials because it allows the real time self-monitoring of civil infrastructures. As observed for cement-based materials, the use of a conductive filler can enhance the piezoresistive response by avoiding measuring issues related to the electrical polarization. In this work we present preliminary results about the piezoresistive characterization of a metakaolin based geopolymeric mortar filled with graphene nanoplatelets. Note de contenu : - Samples preparation
- Piezoresistive characterization
- Fig. 1 : Optical micrograph of the geopolymer/graphene composite with a graphene content higher than 1%wt. The presence of a graphene macro-cluster can be clearly observed (black spot)
- Fig. 2 : Geopolymeric sample with silver paint/copper wire electrodes and glued strain gauge
- Fig. 3 : a) Electrical resistance strain signal ; b) variation of the electrical resistance versus strain for a compression loading/unloagind cycle
- Table 1 : Young's modulus values, E, maximum gauge factor Gf and relative frequency of the input current at which the maximum G, was obtained, for all the materials producedEn ligne : https://drive.google.com/file/d/1MGC2SuqfRkvliZ3-9-pFAuMO3VnhWyIz/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31799
in JEC COMPOSITES MAGAZINE > N° 126 (01-02/2019) . - p. 62-65[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20472 - Périodique Bibliothèque principale Documentaires Disponible Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings / Sushil S. Pawar in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 4 (07/2022)
![]()
[article]
Titre : Pigmented silicone/epoxy novel blends for preparation of stratified nontoxic foul release coatings Type de document : texte imprimé Auteurs : Sushil S. Pawar, Auteur ; R. Baloji Naik, Auteur ; Sangram K. Rath, Auteur ; T. K. Mahato, Auteur ; Balasubramanian Kandasubramanian, Auteur Année de publication : 2022 Article en page(s) : p. 1269-1285 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Alliages polymères
Animaux marins
Anticorrosifs
Anticorrosion
Caractérisation
Concentration pigmentaire volumique
Epoxydes
Essais d'adhésion
Formulation (Génie chimique)
Pigments inorganiques
Revêtements antisalissures
Revêtements autostratifiants
Revêtements organiques
SiliconesLes silicones, ou polysiloxanes, sont des composés inorganiques formés d'une chaine silicium-oxygène (...-Si-O-Si-O-Si-O-...) sur laquelle des groupes se fixent, sur les atomes de silicium. Certains groupes organiques peuvent être utilisés pour relier entre elles plusieurs de ces chaines (...-Si-O-...). Le type le plus courant est le poly(diméthylsiloxane) linéaire ou PDMS. Le second groupe en importance de matériaux en silicone est celui des résines de silicone, formées par des oligosiloxanes ramifiés ou en forme de cage (wiki).Index. décimale : 667.9 Revêtements et enduits Résumé : Incompatible polymer blends of epoxy and silicone were used for the preparation of single-coating system having anticorrosive and foul release properties by self-stratifying process. The single-coat application consists of a fixed 20 pigment volume concentration (PVC) anticorrosive bottom coat based on epoxy with a mixture of pigments like iron oxide, barytes, and zinc phosphate, and a fixed 10 PVC hydrophobic topcoat consisting of silicone resin and titanium dioxide pigment. Both the coatings were prepared separately in triple role and ball mill, respectively. Three different coating compositions were prepared by mixing silicone and epoxy coatings in different weight ratios (70:30, 80:20, and 90:10). Required amount of hardener, crosslinker, and catalyst were added to these prepared compositions separately prior to application and were thoroughly mixed and applied on mild steel and glass specimens. The prepared stratified coatings were named as STR-1, STR-2, and STR-3. The formation of self-stratification was confirmed by optical microscopy, FE-SEM, FTIR spectroscopy, and contact angle measurement. The coating systems were evaluated for adhesion, tensile strength, corrosion resistance, pseudobarnacle adhesion properties, and accumulation of foulant studies by immersion of test coupons in seawater. It is confirmed that there exists a most favorable stratified coating composition in terms of silicone and epoxy weight ratios which showed performance enhancement in terms of the hydrophobicity and foul release properties compared to other coating compositions. Note de contenu : - EXPERIMENTAL : Materials - Preparation of epoxy-based anticorrosive coating (bottom coat) and silicone-based fouling release coating (topcoat) - composition for 10 PVC silicone coating - Formulations of stratified fouling release coatings
- CHARACTERIZATION METHODS : Physical properties - FTIR spectroscopy - Measurement of contact angle - FESEM study - Electrochemical impedance spectroscopy (EIS) - Investigation of pseudobarnacle adhesion strength - Assessment of foul release property of stratified coatings in seawater - Resistance to corrosion under cathodic protection
- Table 1 : The composition for 20 PVC epoxy coating
- Table 2 : The composition for 10 PVC silicone coating
- Table 3 : Physical properties of stratified coatings
- Table 4 : Pseudobarnacle adhesion test of stratified coatings
- Table 5 : Experimental details for resistance to cathodic protectionDOI : https://doi.org/10.1007/s11998-021-00610-4 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00610-4.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38053
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 4 (07/2022) . - p. 1269-1285[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 23574 - Périodique Bibliothèque principale Documentaires Disponible Pine tannin extraction from residues of pine forest exploitation / Mireia Conde in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 6 (06/2020)
![]()
[article]
Titre : Pine tannin extraction from residues of pine forest exploitation Type de document : texte imprimé Auteurs : Mireia Conde, Auteur ; Felipe Combalia, Auteur ; Lluis Ollé, Auteur ; Anna Bacardit, Auteur Année de publication : 2020 Article en page(s) : p. 215-221 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Agents de tannage
Biomasse
Bois -- Déchets
Caractérisation
Chimie analytique
Chromatographie
Déchets organiques -- Recyclage
Ecorces
Extraction (chimie)
Pins et constituants
Recyclage (déchets, etc.)
Tanins végétauxIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The main aim of this study is to use the vegetable extract obtained from the residues of pine forest exploitation as a source of tannins that, acting both as a tanning and retanning agent, can replace other vegetable extracts and chrome in leather tanning. The study thus proposes a bio resource more sustainable to use in tanning process that avoids the use of chemical products that are detrimental to our health and can have an impact on the biodegradable nature of the final tanned leather. Furthermore, in addition to the benefits of using a new, fully biodegradable tanning material (Biodegradability of vegetable tanned leather is poor than chrome tanned leather), this is a locally sourced product, which allows the carbon footprint to be notably reduced (Vegetable tanning contributes more carbon foot print than chrome tanning). Additionally, it should be possible to add value to forestry residues over a short period of time, which would undoubtedly contribute to improving forest management in Spain and would also be beneficial in many ways. Note de contenu : - EXPERIMENTAL : Collection of residual forest biomass - Physical modification - Chemical analysis
- RESULTS AND DISCUSSION : Initial analysis of tanning agents of the by-products - Physical modification of by-products - Physical characterization of the bark - Characterization of tannins in pine by-products by HPLC-UVDOI : https://doi.org/10.34314/jalca.v115i6.3821 En ligne : https://drive.google.com/file/d/1kaPjaufGo4eVp1r8r_Z4p1goLoIx9sCG/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34323
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 6 (06/2020) . - p. 215-221[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21821 - Périodique Bibliothèque principale Documentaires Disponible Plasma deposition of silver nanoparticles onto poly(ethylene terephthalate) surfaces for the preparation of antimicrobial materials / Hanène Salmi-Mani in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 20, N° 4 (07/2023)
![]()
[article]
Titre : Plasma deposition of silver nanoparticles onto poly(ethylene terephthalate) surfaces for the preparation of antimicrobial materials Type de document : texte imprimé Auteurs : Hanène Salmi-Mani, Auteur ; Grégory Balthazar, Auteur ; J. Atkins, Auteur ; Caroline Aymes-Chodur, Auteur ; Patrick Ribot, Auteur ; Gabriel Terreros, Auteur ; Nadine Barroca-Aubry, Auteur ; Christophe Regeard, Auteur ; Philippe Roger, Auteur Année de publication : 2023 Article en page(s) : p. 1395-1405 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact
Antibactériens
Argent
Caractérisation
Essais d'adhésion
Evaluation
Micro-ondes
Nanoparticules
Polyéthylène téréphtalate
Projection au plasma
Rayonnement ultraviolet
Revêtements
ThiolsIndex. décimale : 667.9 Revêtements et enduits Résumé : Poly(ethylene terephthalate) (PET) films were surface-modified according to microwave plasma activation allowing for dithiol functions grafting (1,6-hexanedithiol) in order to fabricate self-assembled photogenerated silver nanoparticles monolayers. The present study was carried out in constant discharge power conditions and the impact of the plasma treatment on PET wettability properties were reported. PET material modifications were characterized at various stages of the process : plasma activation, dithiol functionalization, and nanosilver grafting according to several experimental techniques : water contact angle measurements and X-ray photoelectron spectroscopy (XPS). The surface topography was studied by atomic force microscopy (AFM). Finally, antibacterial properties of PET material including silver nanoparticles were evaluated to determine the probability to reduce the surface bacterial adhesion of Staphylococcus aureus strain selected as pathogenic bacteria model. Surface grafted with silver nanoparticles was found to be particularly reactive and led to an inhibition of S. aureus adhesion around 96.2% in comparison with the unmodified PET material. Note de contenu : - EXPERIMENTAL PART
- General materials
- PET-plasma modification and thiol functionalization
- In situ photogeneration of silver nanoparticles
- Antibacterial activity assessment
- Bacterial adhesion tests
- Equipment and characterization
- Plasma reactor
- UV irradiation
- Contact angle measurements
- Atomic force microscopy (AFM) measurements
- X-ray photoelectron spectroscopy (XPS) measurements
- RESULTS AND DISCUSSION :
- Preliminary study : effect of plasma treatment
- Table 1 : Elemental composition (%) of untreated PET, PET-plasma, PET-plasma-SH, and PET-plasma-SH-Ag substratesTable 2 Water contact angles after each step of the treatment : (a) Untreated PET, (b) PET-plasma, (c) PET-plasma-SH, and (d) PET-plasma-SH-AgDOI : https://doi.org/10.1007/s11998-022-00752-5 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-022-00752-5.pdf?pdf=button% [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39724
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 20, N° 4 (07/2023) . - p. 1395-1405[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 24153 - Périodique Bibliothèque principale Documentaires Disponible Plasma surface treatment and modification for carbon, flax, and glass fibers / Inès Serrano Pascual in MAN-MADE FIBERS INTERNATIONAL, Vol. 73, N° 4 (2023)
![]()
PermalinkPoly(lactic acid)/acrylonitrile butadiene styrene nanocomposites with hybrid graphene nanoplatelet/organomontmorillonite : effect of processing temperatures / Mohd Bijarimi in INTERNATIONAL POLYMER PROCESSING, Vol. XXXV, N° 4 (08/2020)
![]()
PermalinkPoly(methyl methacrylate) intercalated layered double hydroxide film with enhanced alkaline corrosion resistance for aluminum alloy AA6061 / Po-Yi Liu in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)
![]()
PermalinkPolyacrylate ester-based polycarboxylate (PCE) as a new leather retanning agent / Miquel Canudas in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 3 (03/2019)
![]()
PermalinkPolyaniline encapsulated a-zirconium phosphate nanosheet for enforcing anticorrosion performance of epoxy coating / Yue Situ in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
![]()
PermalinkPolycaprolactone tridentate ligand corrosion inhibitors coated on biodegradable Mg implant / Hamouda M. Mousa in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 4 (07/2021)
![]()
PermalinkPolydopamine-coated silk yarn for improving the light fastness of natural dyes / Sanhanut Kesornsit in COLORATION TECHNOLOGY, Vol. 135, N° 2 (04/2019)
![]()
PermalinkPolydopamine functional reduced graphene oxide for enhanced mechanical and electrical properties of waterborne polyurethane nanocomposites / Shengwen Zhang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 6 (11/2018)
![]()
PermalinkPolyelectrolytes fabrication on magnesium alloy surface by layer-by-layer assembly technique with antiplatelet adhesion and antibacterial activities / Mengke Peng in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 3 (05/2019)
![]()
PermalinkPolyimide–polyester hybrid UV-curable powder coating / Hamideh M. Shokouhi Mehr in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)
![]()
PermalinkPolylactic acid polyols in urethane reactive hot-melt and solventborne adhesives / William D. Coggio in ADHESIVES & SEALANTS INDUSTRY (ASI), Vol. 27, N° 3 (03/2020)
![]()
PermalinkPolymer structure characterization / Richard A. Pethrick / Cambridge [Royaume-Uni] : The Royal Society of Chemistry (2007)
PermalinkDes polymères dans les batteries Li-ion aux batteries à électrolytes polymères / Laurent Bernard in L'ACTUALITE CHIMIQUE, N° 456-457-458 (11-12/2020 - 01/2021)
PermalinkLes polymères de précision : du laboratoire à l'industrie / Jean-François Lutz in L'ACTUALITE CHIMIQUE, N° 456-457-458 (11-12/2020 - 01/2021)
PermalinkPolymerizable allyl anionic and nonionic emulsifier: synthesis and properties of its emulsion for architectural coating / Ye Wang in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 6 (11/2021)
![]()
Permalink