Document Detail

Additional effects of silver nanoparticles on bactericidal efficiency depend on calcination temperature and dip-coating speed.
MedLine Citation:
PMID:  21724887     Owner:  NLM     Status:  MEDLINE    
There is an increasing interest in the application of photocatalytic properties for disinfection of surfaces, air, and water. Titanium dioxide is widely used as a photocatalyst, and the addition of silver reportedly enhances its bactericidal action. However, the synergy of silver nanoparticles and TiO(2) is not well understood. The photocatalytic elimination of Bacillus atrophaeus was examined under different calcination temperatures, dip-coating speeds, and ratios of TiO(2), SiO(2), and Ag to identify optimal production conditions for the production of TiO(2)- and/or TiO(2)/Ag-coated glass for surface disinfection. Photocatalytic disinfection of pure TiO(2) or TiO(2) plus Ag nanoparticles was dependent primarily on the calcination temperature. The antibacterial activity of TiO(2) films was optimal with a high dip-coating speed and high calcination temperature (600°C). Maximal bacterial inactivation using TiO(2)/Ag-coated glass was also observed following high-speed dip coating but with a low calcination temperature (250°C). Scanning electron microscopy (SEM) showed that the Ag nanoparticles combined together at a high calcination temperature, leading to decreased antibacterial activity of TiO(2)/Ag films due to a smaller surface area of Ag nanoparticles. The presence of Ag enhanced the photocatalytic inactivation rate of TiO(2), producing a more pronounced effect with increasing levels of catalyst loading.
Nhung Thi Tuyet Le; Hirofumi Nagata; Mutsumi Aihara; Akira Takahashi; Toshihiro Okamoto; Takaaki Shimohata; Kazuaki Mawatari; Yhosuke Kinouchi; Masatake Akutagawa; Masanobu Haraguchi
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-07-01
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  77     ISSN:  1098-5336     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-08-05     Completed Date:  2011-12-15     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5629-34     Citation Subset:  IM    
Department of Preventive Environment and Nutrition, Institute of Health Biosciences, University of Tokushima Graduate School, Tokushima City, Tokushima, Japan.
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MeSH Terms
Anti-Bacterial Agents / pharmacology*
Bacillus / drug effects*,  radiation effects
Disinfectants / pharmacology
Glass / chemistry
Hot Temperature*
Metal Nanoparticles / chemistry*,  ultrastructure
Microbial Sensitivity Tests / methods*
Microscopy, Electron, Scanning
Silicon Dioxide / pharmacology
Silver / pharmacology*
Time Factors
Titanium / pharmacology
Ultraviolet Rays
Reg. No./Substance:
0/Anti-Bacterial Agents; 0/Disinfectants; 15FIX9V2JP/titanium dioxide; 7440-22-4/Silver; 7440-32-6/Titanium; 7631-86-9/Silicon Dioxide

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