Ag and Ag/TiO2 nano-dispersed systems for treatment of leathers with strong antifungal properties / Carmen Gaidau in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVI, N° 3 (03/2011)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CVI, N° 3 (03/2011) . - p. 102-109 Titre : Ag and Ag/TiO2 nano-dispersed systems for treatment of leathers with strong antifungal properties Type de document : texte imprimé Auteurs : Carmen Gaidau, Auteur ; Aurora Petica, Auteur ; Teodora Dragomir, Auteur ; Horia Iovu, Auteur ; Corina Andronescu, Auteur Année de publication : 2011 Article en page(s) : p. 102-109 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Antifongiques Antimicrobiens Argent Dioxyde de titane Dispersions et suspensions Electrochimie Nanoparticules Spectroscopie de photoélectrons Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The purpose of our work was to create leathers with enhanced antifungal and antimicrobial properties by treating with efficient and ecological agents. Using a simple and productive electrochemical method, stable and high purity nano-Ag based colloidal solutions containing 35 ppm Ag, with 4 nm diameter and – 44 mV zeta potential and Ag/TiO2 dispersed solutions containing 10g/l TiO2 and 45 ppm Ag, with 19.7 nm diameter and – 36.8 mV zeta potential, were obtained. Solutions obtained in this manner have affinity for wet blue or metal-free leather. Even though both colloidal silver solutions and Ag/TiO2 disperse solutions have a very good antifungal and antibacterial activity, only leather treated with Ag/TiO2, especially wet blue type, exhibits a strong antifungal activity up to 28 days of fungi exposure. Also, wet blue and metal-free leathers treated with colloidal silver solutions and Ag/TiO2 dispersed solutions present inhibitory action against Pseudomonas aeruginosa (ATCC 9027) and Staphylococcus aureus (ATCC 6538). XPS measurements, relating to composition and chemical state of the Ag on the leather surface, have shown that leather treated with Ag/TiO2 nano-dispersed systems has a greater content of silver Ag0 than in the case of colloidal silver solutions treatment, Ag being better deposited in the matrix of TiO2 nano-powder, and released gradually as silver ions Ag+. The new products give the perspective of a new range of ecologic products, with applications both in the area of leather articles for medical and everyday use, and in the area of materials for additional treatment of wet blue palletized leathers, etc. Note de contenu : METHODS : Synthesis of CSS and Ag/Tio2 nano-dispersed systems - Analyses of CSS and Ag/TiO2 nano-dispersed systems - Treatment of leathers with CS and Ag/TiO2 nano-dispersed systems - Analyses and leathers treated with CSS and Ag/TiO2 nano-dispersed. RESULTS AND DISCUSSION : Characteristics of CSS and Ag/TiO2 nano-dispersed systems - Antifungal charactristics of Ag and Ag/TiO2 nano-dispersed systems and treated leaters - Bacterial resistance of Ag solutions and Ag/TiO2 nano-dispersed systems and of leathers treated with these solutions - AAS and XPS analyses of silver in treated leathers - Technological and economical consideration of Ag/TiO2 nano-dispersed systems application in leather industry. En ligne : https://drive.google.com/file/d/1f7t3kHpZ9R6YbNLwxYtPbMWLXYi2KFIi/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11239 [article]

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Aluminum tanning of hide powder and skin pieces under microwave irradiation / Yue Liu in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 13 p. Titre : Aluminum tanning of hide powder and skin pieces under microwave irradiation Type de document : texte imprimé Auteurs : Yue Liu, Auteur ; Bin Song, Auteur ; Jinwei Zhang, Auteur ; Carmen Gaidau, Auteur ; Haibin Gu, Auteur Année de publication : 2020 Article en page(s) : 13 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Aluminium L'aluminium est un élément chimique, de symbole Al et de numéro atomique 13. C’est un métal pauvre, malléable, de couleur argent, qui est remarquable pour sa résistance à l’oxydation13 et sa faible densité. C'est le métal le plus abondant de l'écorce terrestre et le troisième élément le plus abondant après l'oxygène et le silicium ; il représente en moyenne 8 % de la masse des matériaux de la surface solide de notre planète. L'aluminium est trop réactif pour exister à l'état natif dans le milieu naturel : on le trouve au contraire sous forme combinée dans plus de 270 minéraux différents, son minerai principal étant la bauxite, où il est présent sous forme d’oxyde hydraté dont on extrait l’alumine. Il peut aussi être extrait de la néphéline, de la leucite, de la sillimanite, de l'andalousite et de la muscovite. L'aluminium métallique est très oxydable, mais est immédiatement passivé par une fine couche d'alumine Al2O3 imperméable de quelques micromètres d'épaisseur qui protège la masse métallique de la corrosion. On parle de protection cinétique, par opposition à une protection thermodynamique, car l’aluminium reste en tout état de cause très sensible à l'oxydation. Cette résistance à la corrosion et sa remarquable légèreté en ont fait un matériau très utilisé industriellement. L'aluminium est un produit industriel important, sous forme pure ou alliée, notamment dans l'aéronautique, les transports et la construction. Sa nature réactive en fait également un catalyseur et un additif dans l'industrie chimique ; il est ainsi utilisé pour accroître la puissance explosive du nitrate d'ammonium. Analyse thermique Cuirs et peaux Cuirs et peaux de chèvres Eaux usées -- Analyse Fourier, Spectroscopie infrarouge à transformée de Micro-ondes Microscopie électronique à balayage Poudre de peaux Tannage minéral Tannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminium Thermogravimétrie Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The application and mechanism study of microwave irradiation in traditional industries have attracted considerable attention owing to the unique thermal and athermal effects that could lead to unexpected benefits in high-efficiency and clean production. Herein, we report the investigation of the aluminum tanning under microwave irradiation upon using hide powder and skin pieces, respectively, as simulants of real hide or skin. The aluminum tanning process and the tanned products under microwave heating (MWH) were studied and compared with those of conventional water bath heating (WBH) as the controls. For the tanning system of hide powder, the tanning effluents were analyzed in terms of pH, conductivity, dielectric constant and aluminum content, and the tanned powder was investigated by differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, and FT-IR spectroscopy. For the skin piece system, the pH and aluminum content of tanning effluents were also determined, and at the same time, DSC, TG, SEM, FT-IR and shrinkage temperature were used to illustrate the actions of microwaves on the structure and properties of the tanned pieces. The results show that aluminum reactivity in the penetration and binding process of collagen fibers in hide powder and skin pieces improved using microwave treatment. The residual aluminum content was greatly reduced by microwave heating action, and the increased amount of aluminum with evener distribution was observed in the tanned products. Microwave irradiation also resulted in the tanned products with better thermal stability and thermal decomposition resistance. This work further promotes application of microwave treatments for aluminum-based tanning in leather industry. Note de contenu : - EXPERIMENTAL : Materials - Aluminum tanning of hide powder - Aluminum tanning of goatskin pieces - Analysis of tanning effluent, tanned hide powder and skin pieces - RESULTS AND DISCUSSION : Effect of microwave irradiation on the aluminum tanning of hide powder - Effect of microwave irradiation on the aluminum tanning of skin pieces - Table 1 : Analysis for the tanning effluents of hide powder under different heating methods - Table 2 : TG analysis of tanned hide powder obtained under different heating methods DOI : https://doi.org/10.1186/s42825-020-00037-w En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00037-w.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37456 [article]

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Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties / Aurora Petica in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p.1153-1163 Titre : Doped TiO2 nanophotocatalysts for leather surface finishing with self-cleaning properties Type de document : texte imprimé Auteurs : Aurora Petica, Auteur ; Carmen Gaidau, Auteur ; Madalina Ignat, Auteur ; Claudiu Sendrea, Auteur ; Liana Anicai, Auteur Année de publication : 2015 Article en page(s) : p.1153-1163 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Angle de contact Cuirs et peaux -- Finition Dioxyde de titane Hydrophilie Nanoparticules Photocatalyse Revêtement auto-nettoyant Index. décimale : 667.9 Revêtements et enduits Résumé : TiO2 nanoparticles (TiO2NPs) doped with N and Fe, exhibiting improved photocatalytic activity in the visible light region, were prepared and then applied onto leather surfaces. Diffuse reflectance spectra measurements evidenced the shifting of the absorption peak toward visible region and the enlargement of absorption band (the so-called “tail” of the band). Absorbance spectra for a 20 ppm methylene blue (MB) solution, in the presence of 0.1% (wt%) doped TiO2NPs after 1 h under visible light irradiation, showed the high efficiency of the doping. Doped TiO2NPs were embedded in composites material based on acrylic binder, nitrocellulose lacquer, and pigmented paste and were used for leather surface finishing. Self-cleaning properties were confirmed by spectrophotometrical measurements and CIELab color coordinates recording for the degradation of MB spots applied to the treated leather surface exposed to UVA (λ = 365 nm) and visible light irradiation. Leather treated with Fe–N co-doped TiO2NPs presents the highest activity for MB spot degradation under visible light irradiation. The photographic images of MB dye spots and ball pen ink lines indicate a complete degradation after 30 h of exposure to visible light. Water contact angle measurements in dynamic conditions evidenced the photo-induced hydrophilicity process on functionalized leather surface, supporting the degradation phenomena through water and oxidative species generation. Note de contenu : - EXPERIMENTAL : Synthesis of doped titania nanopowders - Leather surface treatment - Characterization methods - RESULTS AND DISCUSSION : Structural and morphological characterization - Optical properties of doped TiO2 nanopowders - Photocatalytic activity of the doped TiO2PNs - Self-cleaning characterization of the treated leather DOI : 10.1007/s11998-015-9711-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9711-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24973 [article]

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Influence of microwave on chromium complex composition in tanning liquor / Jinwei Zhang in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)  

[article]  inJOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 11 p. Titre : Influence of microwave on chromium complex composition in tanning liquor Type de document : texte imprimé Auteurs : Jinwei Zhang, Auteur ; Wuyong Chen, Auteur ; Carmen Gaidau, Auteur Année de publication : 2020 Article en page(s) : 11 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chromatographie par échange d'ions Chromatographie sur gel Complexes métalliques Liqueurs de tannage Micro-ondes Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Since microwave irradiation could promote hydrolysis and olation of chromium tanning liquor, but the influence of microwave on chromium complex component in the liquor was still unknown. Chromium sulphate solution (0% basicity) and 33% basicity chromium tanning liquor were subjected microwave (MW) and water bath (WB) heating, and the samples without any warming were regarded as control. Ion exchange chromatography (IEC) and gel filtration chromatography (GFC) were used to measure the charge composition and molecular size of chromium complexes in each sample. FT-IR was used to characterize the structure of chromium complexes in each composition separated by IEC. Moreover, the chromium tanning liquor after warming was used in hide powder tanning trials to illustrate whether microwave would affect its tanning ability. The results show there are more high positive charge and large molecular size complexes in chromium tanning liquor after warming but the phenomena are more significant in MW samples compared with WB due to non-thermal effect of microwave. In addition, microwave has more powerful effect on 33% basicity chromium tanning liquor hydrolysis and olation to generate larger molecular size complexes. In FT-IR results, the combination pattern between chromium and ligands are changed after warming but there is no difference between WB and MW. The chromium exhaustion and thermal stability of hide powder tanned with chromium tanning liquor after microwave irradiation are both higher. It could conclude that both thermal and non-thermal effects of microwave promote the process together, and the non-thermal effect leads to more high positive charge and large molecular size complexes and has stronger influence on high polarity system. In short, this work would provide theoretical basis for applying microwave in tanning agent modification and chrome tanning process further. Note de contenu : - EXPERIMENTAL : Reagents and materials - Instruments - Sample preparation - Determination methods - RESULTS AND DISCUSSION : The influence of microwave on chromium charge composition in tanning liquor - The influence of microwave on chromium molecular size in tanning liquors - The influence of microwave on chromium complex structure - The influence of microwave on tanning ability of chromium tanning liquor - Table 1 : The content of each component in 0% basicity chromium sulphate tanning liquor warmed under different methods - Table 2 : The content of each component in 33% basicity chromium sulphate tanning liquor warmed under different methods - Table 3 : FT-IR absorption peaks of SO42− in chromium complex from each component in 0% basicity chromium sulphate tanning liquor - Table 4 : FT-IR absorption peaks of SO42− in chromium complex from each component in 33% basicity chromium sulphate tanning liquor - Table 5 : The thermal behaviors and chrome content of hide powder tanned by chrome tanning liquor treated by different method DOI : https://doi.org/10.1186/s42825-020-00024-1 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-020-00024-1.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37334 [article]

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Microwave irradiation : an innovative routine to promote goat skin chrome tanning process / Jinweil Zhang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIV, N° 8 (08/2019)  

[article]  inJOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIV, N° 8 (08/2019) . - p. 287-292 Titre : Microwave irradiation : an innovative routine to promote goat skin chrome tanning process Type de document : texte imprimé Auteurs : Jinweil Zhang, Auteur ; Wuyomg Chenand, Auteur ; Carmen Gaidau, Auteur Année de publication : 2019 Article en page(s) : p. 287-292 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuirs et peaux de chèvres Micro-ondes Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The chemical reaction with microwave assistant has faster rate, higher yield and milder condition. In order to study the influence of microwave on chrome tanning process, the chrome tanning with microwave heating (MW) was carried out at different initial pH and terminal pH regraded as experimental samples and with water bath heating (WB) at corresponding condition was control in the study. The shrinkage temperature, chrome content and chrome distribution of wet blue were determined to obtain the influence of microwave on tanning effect. In addition, the pickled skins were modified by esterification and deamination and then the modified skins were tanned under microwave to know whether microwave would affect the combination sites between collagen and chromium complex or not. The results showed that microwave had positive effect on chrome tanning process, representing as higher shrinkage temperature and chrome content as well as more uniform chrome distribution for leather. Especially, the shrinkage temperature of MW leather exceeded 100°C when tanning terminal ending pH was only 3.3, indicating the tanning with microwave assistance could complete under a lower pH than the usual. Moreover, the combination sites between collagen and chromium of MW leather were the same as WB, indicating the effect of microwave could not change the combination sites. In sum, microwave could promote chrome tanning and make it finish at a milder condition, which might innovate the tanning technology and provide a new chrome tanning method in the future. Note de contenu : - EXPERIMENTAL : Materials - Tanning method : chrome tanning at different initial pH - Chrome tanning at different terminal Ph - Deaminated skin tanning - Esterified skin tanning - Test method : Ts measurement - Leather chrome content measurement - Chrome distribution uniformity determination - SEM/EDS analysis - RESULTS AND DISCUSSION : Influence of microwave on different initial pH chrome tanning - Influence of microwave on different final chrome tanning Ph - Influence of microwave on chrome combination sites En ligne : https://drive.google.com/file/d/15o7pNS84BLYZpTRQUJB9PsMjtE37Xs-T/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32788 [article]

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Preparation of antibacterial sheepskin with silver nanoparticles : potential for use as a mattress for pressure ulcer prevention / Weite Yang in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVII, N° 3 (03/2012)  

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The impact of acid rain on vegetable tanned leather / Yanping Gao in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 100, N° 3 (05-06/2016)  

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The thermal and non-thermal effects of microwave in the chrome tanning process / Jinwei Zhang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 2 (03-04/2020)  

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