title: Antibacterial and water purification activities of self-assembled honeycomb structure of aerosol deposited titania film.
abstract: A simple and rapid room-temperature aerosol deposition method was used to fabricate TiO(2) films for photokilling/photdegradation applications. TiO(2) particles were accelerated to supersonic speeds and fractured upon impacting a glass substrate to form a functional thin film, a process known as aerosol deposition. After deposition, the films were annealed at various temperatures, and their photokilling/photodegradation performances following ultraviolet (UV) exposure were evaluated by counting the number of surviving bacterial colonies, and by a methylene blue decolorization test. The photocatalytic performances of all TiO(2) films were obtained under weak UV exposure (0.6 mW/cm(2)). The film density, crystalline phase, and surface roughness (morphology) were measured by scanning electron microscopy, X-ray diffraction, UV-visible spectroscopy, and atomic force microscopy. The unique, self-assembled honeycomb structure of the aerosol deposited films contributed to the increase in surface area because of extreme roughness, which enhances the photokilling and photodegradation performance. Nonannealed films yielded the best photocatalytic performance due to their small crystalline sizes and large surface areas due to increased surface roughness.
authors.affiliation: School of Mechanical Engineering, Korea University, Seoul, 136-713 Korea.
authors.forename: Jung-Jae
authors.initials: JJ
authors.lastname: Park
authors.forename: Jong-Gun
authors.initials: JG
authors.lastname: Lee
authors.forename: Do-Yeon
authors.initials: DY
authors.lastname: Kim
authors.forename: Joo-Hyun
authors.initials: JH
authors.lastname: Hong
authors.forename: Jae-Jin
authors.initials: JJ
authors.lastname: Kim
authors.forename: Seungkwan
authors.initials: S
authors.lastname: Hong
authors.forename: Sam S
authors.initials: SS
authors.lastname: Yoon
mesh_terms: D000336:Aerosols / Q000737:chemistry; D000900:Anti-Bacterial Agents / Q000737:chemistry*; D015169:Colony Count, Microbial; D008751:Methylene Blue / Q000737:chemistry; D008853:Microscopy; D010782:Photolysis; D013057:Spectrum Analysis; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D000336:Aerosols; D000900:Anti-Bacterial Agents; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium; D008751:Methylene Blue