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Citation: Qin Cao, Wang Ting-Jie, Jin Yong. The Coating Process of Nano-scale Hydrous Silica Film on TiO₂ Particles by Chemical Deposition in Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2002, 18(10): 884-889. doi: 10.3866/PKU.WHXB20021004 shu

The Coating Process of Nano-scale Hydrous Silica Film on TiO₂ Particles by Chemical Deposition in Aqueous Solution

1.
Department of Chemical Engineering, Tsinghua University, Beijing　100084

Received Date: 21 January 2002
Available Online: 15 October 2002

The coating process of nano-scale hydrous silica film on TiO2 pigmentary particles by chemical deposition in aqueous solution has been investigated. Through the analysis of TEM images and dissolving the samples with hot sulfuric acid, it is proved that a uniform dense film of hydrous silica on TiO2 pigmentary particles is produced. Samples were taken in the coating process and analyzed by X-ray photoelectron spectroscopy (XPS),X-ray fluorescence (XRF),zeta-potential analyzer and transmission electron microscope (TEM). The silica composition and structure of the film on the coated particles in the coating process were measured and analyzed. It is inferred that polymeric silicate ions first hydrolyze into Si(OH)4,the later then reacts with OH－ groups on the surface of TiO2 particles. The silica acids subsequently produced condense on the surface of the core particles, forming a nano-scale film of polymerized silica. 　　According to the chemical shift of binding energy of Ti 2p,Si 2p and O 1s on the coated particles, the Ti－O－Si bond formation is inferred at the interface of the film and the surface of TiO2 particles. The thickness of the film increases with coating time and aging time. Zeta potential measurement shows that a very thin film coating of 0.5％ mass fraction can change the electrokinetic’s behavior of the particle surface remarkably.
- Titanium dioxide;Coating;Silica;Chemical deposition;Modification
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The Coating Process of Nano-scale Hydrous Silica Film on TiO2 Particles by Chemical Deposition in Aqueous Solution

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通讯作者: 陈斌, bchen63@163.com

The Coating Process of Nano-scale Hydrous Silica Film on TiO₂ Particles by Chemical Deposition in Aqueous Solution