抗菌性纤维素/纳米银复合膜的制备及表征

Preparation and Characterization of Antibacterial Cellulose/Silver Nanoparticles Films

利用新型碱脲溶剂溶解纤维素,与具有天然抗菌性能的纳米银(Ag NPs)结合,制备得到抗菌性的纤维素/纳米银复合膜材料。利用纤维素与聚乙烯吡咯烷酮(PVP)之间的氢键相互作用,选用PVP作为分散剂和保护剂,用传统还原法制备得到纳米银溶液,与纤维素溶液复合,经再生成膜。通过紫外分光光度计、透射电镜(TEM)、固体核磁13C CP/MAS NMR对纳米银和纤维素/纳米银复合膜的结构进行表征。结果表明,纳米银对纤维素的结构基本无影响,而PVP与纤维素之间存在较强的氢键作用使纳米银可在纤维素复合膜中稳定存在。该复合膜具有良好的力学性能。抗菌性测试结果表明,纤维素/纳米银复合膜具有极佳的抗菌性能,对大肠杆菌的抗菌活性在3以上,灭菌率高达99.9%。

Combined with silver nanoparticles （ AgNPs） with natural antibacterial property, cellulose dissolved by new Alkali urea solvent was used to prepared antibacterial cellulose/silver nanoparticles composite films. The AgNPs solution were synthesized by traditional method with polyvinyl pyrrolidone （PVP） as the dispersant and protective agent. And by the interaction of hydrogen-bond between cellulose and PVP, the resultant AgNPs solution combined with the cellulose solution, regenerating the film as a result. The structure of AgNPs and cellulose/AgNPs films were characterized by ultraviolet spectrophotometer, transmission electron microscopy （TEM） and solid state ^13C CP/MAS NMR. Results showed that AgNPs had no effect on the structure of cellulose and AgNPs was stable in the composite cellulose film because of the stronger interaction of hydrogen-bond between cellulose and PVP. The composite films exhibited good mechanical properties. And cellulose/AgNPs films also showed strong antibacterial activity, with the antibacterial activity against escherichia coil beyond 3 and the sterilization rate up to 99. 9%.