Gaidau C.,RandD National Institute for Textile and Leather |
Petica A.,INCDIE ICPE CA |
Trandafir V.,RandD National Institute for Textile and Leather |
Ciobanu C.,Petru Poni Institute of Macromolecular Chemistry |
Martinescu T.,Science Nappa Com Ltd
32nd Congress of the International Union of Leather Technologists and Chemist Societies, IULTCS 2013 | Year: 2013
Leather and sheepskins for medical use are natural materials based on collagen and keratin, well known for preventive and curative properties, suitable for treatment of orthopedic, diabetic or bedsore diseases. The microbiological resistance of leather and sheepskins for medical use is an important characteristics and could be obtained by using quaternary ammonium compounds in washing process, phenol active ingredients in wet or dry finishing stages. In our paper we have investigated the possibility of designing new materials based on nanosilver particles and new technologies for application on medical leathers and sheepskins. The new compounds, nanosilver colloidal solutions obtained by chemical and electrochemical synthesis routes were characterized by DLS (Dynamic Light Scattering), TEM (Transmission Electron Microscopy) and UV- vis spectroscopy. Nanosilver colloidal solutions with 20-40 ppm Ag concentration and particle size of 5 nm were obtained by electrochemical method and have shown a high stability when was prepared with additives based on polyvynilpirrolidone. Colloidal silver solutions were chemically synthesized by reduction of silver nitrate solutions with sodium citrate solution when 137 ppm Ag concentration and 5 nm particle size were obtained. The correlation of different kinds of treatments, silver concentration in leather with antifungal and antibacterial resistance of new collagen supports doped with nanosilver particles was done by using AAS, XPS, antibiogram method for Penicillium glaucum, Aspergillus niger, Trichoderma viride Scopulariopsis brevicaulis, Paecilomyces variotii and diffusimetric method for Staphylococcus aureus, Acinetobacter baumannii, Stenotrophomonas maltophilia and Pseudomonas aeruginosa.