Preparation and antibacterial activity of polyvinyl alcohol/regenerated silk fibroin composite fibers containing Ag nanoparticles |
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| Authors: | Wenli Li Jianjun Wang Hengxuan Chi Guangzhao Wei Jian Zhang Lixing Dai |
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| Affiliation: | College of Chemistry, Chemical Engineering and Materials Science, Dushuhu Campus, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China |
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| Abstract: | Polyvinyl alcohol (PVA)/regenerated silk fibroin (SF)/AgNO3 composite nanofibers were prepared by electrospinning. A large number of nanoparticles containing silver were generated in situ and well‐dispersed nanoparticles were confirmed by transmission electron microscopy (TEM) intuitionally. Ultraviolet (UV)‐visible spectroscopy and X‐ray diffraction (XRD) patterns indicated that nanoparticles containing Ag were present both in blend solution and in composite nanofibers after heat treatment and after subsequent UV irradiation. By annealing the nanofibers, Ag+ therein was reduced so as to produce nanoparticles containing silver. By combining heat treatment with UV irradiation, Ag+ was transformed into Ag clusters and further oxidized into Ag3O4 and Ag2O2. Especially size of the nanoparticles increased with heat treatment and subsequent UV irradiation. This indicated that the nanoparticles containing silver could be regulated by heat treatment and UV irradiation. The antimicrobial activity of heat‐treated composite nanofibers was evaluated by Halo test method and the resultant nanofibers showed very strong antimicrobial activity. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 |
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| Keywords: | poly(vinyl alcohol) regenerated silk fibroin electrospinning Ag nanoparticles nanofibers |
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