The microwave effect on the properties of silica-coated TiO{sub 2} fine particles prepared using sol-gel method

Journal Article · Tue Apr 01 04:00:00 EDT 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.04.031· OSTI ID:21068247

Furusawa, Takeshi ^[1]; Honda, Kozue; Ukaji, Emi; Sato, Masahide ^[2]; Suzuki, Noboru ^[2]

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1. Department of Applied Chemistry, Faculty of Engineering, Utsunomiya University, Yoto 7-1-2, Utsunomiya 321-8585 (Japan)
2. Department of Information and Control Systems Science, Graduate School of Engineering, Utsunomiya University, Yoto 7-1-2, Utsunomiya 321-8585 (Japan)

The silica coating of TiO{sub 2} fine particle was conducted using microwave assisted sol-gel method and conventional sol-gel method to suppress its photo-catalytic activity. The amount and uniformity of silica coating on TiO{sub 2} surface were characterized by X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF), infrared spectroscopy (IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and zeta potential measurements. XPS and XRF results showed that the presence of catalyst and reaction time were important factors to reach high silica amounts. SEM, TEM, and zeta potential results indicated that dense film coating of SiO{sub 2} layer formed on TiO{sub 2} surface in conventional sol-gel method, whereas the nucleation coating was observed on sample prepared by microwave assisted sol-gel method. When photo-catalytic activities and ultraviolet (UV) shielding abilities of these samples were evaluated, the sample prepared by microwave processing showed higher inhibition of photo-catalytic activity and better UV shielding ability than the sample prepared by conventional method. These results suggested that the coating method significantly affected the photo-catalytic activity and UV shielding ability of coated TiO{sub 2}.

• OSTI ID: 21068247
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
INFRARED SPECTRA
MICROWAVE RADIATION
PHOTOCATALYSIS
SCANNING ELECTRON MICROSCOPY
SILICA
SILICON OXIDES
SOL-GEL PROCESS
SURFACE PROPERTIES
TITANIUM OXIDES
TRANSMISSION ELECTRON MICROSCOPY
X-RAY FLUORESCENCE ANALYSIS
X-RAY PHOTOELECTRON SPECTROSCOPY