title: Studies on characteristics of nanostructure of N-TiO2 thin films and photo-bactericidal action.
abstract: Pseudomonas aeruginosa strain (AS1.50) and Bacillus subtilis strain (AS1.439) from Ming lake were decomposed by photocatalytic nanostructure N-TiO(2) thin films in a photo-reactor under UV irradiation. The different thickness nanostructure N-TiO(2) thin films coated on mesh grid were prepared by sol-gel method and immobilized at 500 degrees C (films A) or 350 degrees C (films B) for 1 h in a muffle furnace. The results showed that N-TiO(2) thin film B (8.18 nm thickness, 2.760 nm height and 25.15 nm diameter) has more uniform granular nanostructure and thinner flat texture than N-TiO(2) thin film A (12.17 nm thickness, 3.578 nm height and 27.50 nm diameter). The bactericidal action of N-TiO(2) thin film A and film B for Pseudomonas aeruginosa strain (AS1.50) and Bacillus subtilis varniger strain (AS1.439) were investigated in this work. More than 95% of photocatalytic bactericidal efficiency for Pseudomonas aeruginosa strain (AS1.50) and 75% for Bacillus subtilis strain (AS1.439) were achieved by using N-TiO(2) thin films-B for 70-80 min of irradiation during the photo-bactericidal experimental process. The results indicated that the photo-induced bactericidal efficiency of N-TiO(2) thin films probably depended on the characteristics of the films.
authors.affiliation: Department of Bioengineering, Jinan University, Guangzhou 510632, China. xuxuxu20042005@126.com
authors.forename: Ming-fang
authors.initials: MF
authors.lastname: Xu
authors.forename: Shan
authors.initials: S
authors.lastname: Lin
authors.forename: Xin-man
authors.initials: XM
authors.lastname: Chen
authors.forename: Yan-zhi
authors.initials: YZ
authors.lastname: Peng
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000494:pharmacology*; D001412:Bacillus subtilis / Q000187:drug effects / Q000528:radiation effects; D008567:Membranes, Artificial; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D017672:Nitrogen Compounds / Q000737:chemistry* / Q000494:pharmacology*; D010316:Particle Size; D010777:Photochemistry / Q000379:methods; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000528:radiation effects; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry* / Q000494:pharmacology*; D014466:Ultraviolet Rays
chemical_list: D000900:Anti-Bacterial Agents; D008567:Membranes, Artificial; D017672:Nitrogen Compounds; C009495:titanium dioxide; D014025:Titanium