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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