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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and antibacterial activity of polyvinyl alcohol/regenerated silk fibroin composite fibers containing Ag nanoparticles
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Preparation and antibacterial activity of polyvinyl alcohol/regenerated silk fibroin composite fibers containing Ag nanoparticles

机译：含银纳米粒子的聚乙烯醇/再生丝素蛋白复合纤维的制备及抑菌活性

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摘要

Polyvinyl alcohol (PVA)/regenerated silk fibroin (SF)/AgNO_3 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 Ag_3O_4 and Ag_2O_2. 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.
机译：通过电纺丝法制备了聚乙烯醇（PVA）/再生丝素蛋白（SF）/ AgNO_3复合纳米纤维。原位产生大量含有银的纳米颗粒，并且通过透射电子显微镜（TEM）直观地确认了分散良好的纳米颗粒。紫外线（UV）可见光谱和X射线衍射（XRD）图谱表明，热处理后和随后的紫外线照射后，共混溶液和复合纳米纤维中均存在含银的纳米颗粒。通过退火纳米纤维，其中的Ag +被还原，从而产生包含银的纳米颗粒。通过将热处理与紫外线照射相结合，Ag〜+转变为Ag团簇，并进一步氧化为Ag_3O_4和Ag_2O_2。纳米颗粒的尺寸尤其随着热处理和随后的UV照射而增加。这表明可以通过热处理和紫外线照射来调节含有银的纳米颗粒。通过Halo试验法评价了热处理后的复合纳米纤维的抗菌活性，所得纳米纤维显示出非常强的抗菌活性。

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