title: Study on the heat resistant property of Ag/4A antibacterial agent.
abstract: The heat resistant property of silver-loading zeolite 4A antibacterial agent (SLZ) was investigated by heat treatment methodology. The morphological and structural changes of the specimens were characterized by using differential thermal analyzer (TG-DTA), scanning electron microscopy, and X-ray diffraction techniques. The particle size of the specimens was measured by Malvern instruments zetasizer systems, and silver content of specimens was determined by inductively coupled plasma spectrometer. Escherichia coli (E. coli) was chosen as indicators of fecal contamination to evaluate the antibacterial effect of the specimens by minimum inhibitory concentration method. The service life of the specimens was also tested. The experimental results indicated that as heat-treatment temperature increases, the particle size increases, more aggregating occurs, silver content decreases, the color of SLZ gradually changes from white to brown, and the antibacterial ability falls. The release rate of Ag(+) cation from SLZ became slow after heat treatment at 400, 450, and 500 degrees C, thus resulting in prolonged service life of SLZ. When the heat-treatment temperature approached 800 degrees C, the collapse of SLZ structure occurred, and the crystals of SiO(2) and Al(2)O(3) were formed after recrystallization. Consequently, the heat resistant temperature of SLZ can be as high as 500 degrees C. SLZ could be used in antibacterial plastics, antibacterial fibers, or biomedical materials.
authors.affiliation: Key Laboratory of Interface Science and Engineering, Advanced Materials of Taiyuan University of Technology, Ministry of Education, Taiyuan, 030024, China. wshou10@163.com
authors.forename: Xu
authors.initials: X
authors.lastname: Bingshe
authors.forename: Hou
authors.initials: H
authors.lastname: Wensheng
authors.forename: Wang
authors.initials: W
authors.lastname: Shuhua
authors.forename: Wei
authors.initials: W
authors.lastname: Liqiao
authors.forename: Jia
authors.initials: J
authors.lastname: Husheng
authors.forename: Liu
authors.initials: L
authors.lastname: Xuguang
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects; D006358:Hot Temperature; D008027:Light; D008826:Microbial Sensitivity Tests; D018030:Silver Compounds / Q000737:chemistry* / Q000494:pharmacology; D017641:Zeolites / Q000737:chemistry* / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D018030:Silver Compounds; D017641:Zeolites