title: Potent antibacterial activity of a novel silver nanoparticle-halloysite nanotube nanocomposite powder.
abstract: Halloysite nanotubes (HNTs), natural nanotube, have been developed as a support for loading of antibacterial agents. Firstly, HNTs were modified by silane coupling agent (KH-792). And then, modified HNTs were immersed in silver nitrate solution and a complex reaction between the two amino groups of KH-792 and silver ions formed, leading to large clusters on the surface of HNTs. Finally, these silver containing clusters were converted into silver nanoparticles (Ag NPs) with about 5nm diameter by reduction process. A new antibacterial agent, Ag NPs/HNTs, was characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning transmission electron microscopy-energy dispersive X-ray analysis (STEM-EDX). The antibacterial test indicated that Ag NPs/HNTs showed good antibacterial performance against Gram-negative bacteria (Escherichia coli) and Gram-positive bacteria (Staphylococcus aureus).
authors.affiliation: School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, PR China. zhangyatao@zzu.edu.cn
authors.forename: Yatao
authors.initials: Y
authors.lastname: Zhang
authors.forename: Yifeng
authors.initials: Y
authors.lastname: Chen
authors.forename: Haoqin
authors.initials: H
authors.lastname: Zhang
authors.forename: Bing
authors.initials: B
authors.lastname: Zhang
authors.forename: Jindun
authors.initials: J
authors.lastname: Liu
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry*; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000494:pharmacology*; D000077215:Clay; D004926:Escherichia coli / Q000187:drug effects; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008826:Microbial Sensitivity Tests; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry / Q000648:ultrastructure; D043942:Nanotubes / Q000737:chemistry / Q000648:ultrastructure; D011208:Powders; D018030:Silver Compounds / Q000138:chemical synthesis / Q000494:pharmacology*; D013211:Staphylococcus aureus / Q000187:drug effects
chemical_list: D000538:Aluminum Silicates; D000900:Anti-Bacterial Agents; D011208:Powders; D018030:Silver Compounds; D000077215:Clay