PLA基纳米结构银薄膜的抗菌性能

在低温条件下,利用磁控溅射技术,在聚乳酸非织造布表面沉积不同厚度的纳米结构银薄膜,研究PLA基纳米结构银薄膜厚度对样品抗菌性能的影响。采用振荡烧瓶法测试样品的抗菌性能,利用原子力显微镜(AFM)分析纳米结构银薄膜表面形态及粒径,应用EDX分析薄膜表面的元素分布。结果表明:随着薄膜厚度的增大,样品抗菌性能提高;溅射时间延长,薄膜厚度增大,膜层的致密性改善,单位面积上的银含量增加,膜层表面积增大,银离子释放几率增大,是提高抗菌性能的主要原因;当纳米结构银薄膜厚度为1 nm时,对大肠杆菌和金黄色葡萄球菌的抑菌率均达到100%。

Antibacterial properties of PLA nonwovens deposited with nanostructured silver films

Nanostructured silver films of different thicknesses were deposited on the surface of PLA nonwovens by magnetron sputter coating,and the effect of film thickness on antibacterial properties of the prepared samples was studied.Shake flask test was used to assess the antibacterial properties of all samples.Atomic force microscope(AFM) was employed to observe the surface morphology of nanostructured silver films and the grain size of silver particles was analyzed.EDX was used to analyze the surface elemental distribution.The results showed that the antibacterial properties were improved as the film thickness increased.AFM images revealed that as the sputtering time was prolonged,the film thickness increased,the film became compacter,and the specific area of the film also increased,thus,the release rate of silver ions increased,which led to improved antibacterial properties.EDX test results indicated that increase in film thickness led to increase in silver weight percentage per unit surface,causing improved antibacterial properties.Moreover,when the film thickness was 1 nm,the inhibition percentage of Staphylococcus aureus and Escherichia coli were 100%.