等离子体改性多孔聚合物材料负载银纳米粒子的抗菌性能

Antibacterial Performance of Plasma-modified Porous Polymer Materials Loaded with Silver Nanoparticles

在材料表面均匀稳定地负载纳米银粒子并提高其抗菌性能是目前面临的一项挑战。为此利用纳秒脉冲放电预处理结合化学浸渍法制备了一种纳米银-多孔聚合物复合材料。利用原子力显微、X射线光电子能谱测试分析了等离子体改性前后多孔聚合物材料表面物理性能和化学成分的变化。利用扫描电子显微镜和X射线光电子能谱分析了纳米银在多孔聚合物材料表面的分布情况。以大肠杆菌和白色念球菌为测试菌种,测试在不用放电处理时间、脉冲峰值电压、硝酸银浓度以及作用时间下纳米银-多孔聚合物复合材料的抗菌性能。结果表明,等离子体改性时间为20min、脉冲峰值电压30kV的条件下,在10mmol/L的硝酸银溶液中浸渍得到的复合材料在作用时间为5h时,对大肠杆菌和白色念球菌的杀菌率仍高达99.3%和98.9%,展现出良好的抗菌效果。

It is a challenge to load silver nanoparticles uniformly and stably on the surface of materials and improve their antibacterial properties.In this study,we prepared nanosilver-porous polymer composite materials using nanosecond pulsed discharge pretreatment and chemical impregnation post-treatment.The porous polymer materials before and after modified and the distribution of silver nanoparticles on the surface of the porous polymer materials were analyzed using atomic force microscope,scanning electron microscopy and X-ray photoelectron spectroscopy.At different discharge treatment time,pulse peak voltages,and silver nitrate concentrations,the antimicrobial properties of the porous polymer materials before and after nanosilver loading were tested using escherichia coli and candida albicans as test strains.It was found that the composite materials obtained by impregnation in 10 mmol/L of silver nitrate solution under modification time of 20 min and peak pulse voltage of 30 kV still had a high bactericidal rate,and it was 99.3%and 98.9%for Esche-richia coli and Candida albicans at an action time of 5 h,exhibiting excellent antimicrobial effects.