摘要
本文用水热法制备了纳米氧化钛/多壁碳纳米管(TiO2/MWNT)的复合材料,将该复合材料在自然光下对大肠杆菌进行处理,用原子力显微镜(AFM)观察菌体在受其作用前后的变化过程,探讨该复合材料的抑菌机理。本文提供了直接的证据证明,该材料能在可见光下催化降解细菌壁膜导致大肠杆菌的死亡。此外,经复合材料作用后的菌体表面粗糙度变大,弹性系数由0.30 N/m下降至0.14 N/m。复合材料之所以具有比纯氧化钛更强的杀菌效果主要是碳纳米管的加入不但可改善纳米TiO2的分散性,更主要的是有利于氧化钛光生电子和空穴对的有效分离。
TiO2/multi-walled carbon nanotube （TiO2/MWNT） nancomposites were prepared by a hydrothermal method. Their antibacterial effect on E. coli under natural light was investigated by atomic force microscopy （AFM） through observing the E. coli envelope morphology before and after TiO2/ MWNT composites treatment. The direct evidence was provided to indicate that the composites can photocatalytie degrade the bacterial wall membrane leading to cell death under visible light. It was also found that the roughness of E. coli increases, and the spring constant decreases from 0. 30 N/m to 0. 14 N/m as a consequence of TiO2/MWNT composites action. The MWNT not only provided a large surface area support for the titania catalyst, but also stabilized the charge separation of electron and cavity by trapping the electron transferred from TiO2 , which was the main reason why the composites have better antibacterial effect than pure TiO2.
出处
《电子显微学报》
CAS
CSCD
2013年第4期337-343,共7页
Journal of Chinese Electron Microscopy Society
基金
国家自然科学基金资助项目(No.50902076
No.51072087)
山东省自然科学基金资助项目(Nos.ZR2011EMM018
ZR2012EMQ001)
高性能陶瓷和超微结构国家重点实验室开放基金(No.SKL201010SIC)
