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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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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