Dispersion of Phosphonic Acids Surface-Modified Titania Nanocrystals in Various Organic Solvents

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• 作者：Toshihiko Arita ; Ken-ichi Moriya ; Tomoka Yoshimura ; Kimitaka Minami ; Takashi Naka ; Tadafumi Adschiri
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2010
• 出版时间：October 20, 2010
• 年：2010
• 卷：49
• 期：20
• 页码：9815-9821
• 全文大小：287K
• 年卷期：v.49,no.20(October 20, 2010)
• ISSN：1520-5045

文摘

Titanium dioxide (TiO₂, anatase) nanocyrstals tha can be transparently (perfectly) dispersed in several organic solvents were synthesized by organic-ligand-assisted hydrothermal synthesis. To analyze the dispersion behavior of surface-modified nanocrystals from the surface of the surface-modified nanocrystals, three types of surface-modified TiO₂ nanocrystals were prepared. Depending on the surface nature of the surface-modified TiO₂ nanocrystals, the nanocrystals showed different dispersion behaviors in organic solvents. In particular, the dispersion of surface-modified TiO₂ nanocrystals with carboxylic acid terminated surface modifier (TiO₂—COOH) varied strongly with changing solvent species. We investigated the dispersity of TiO₂—COOH in typical organic solvents using dynamic light scattering (DLS) measurements. One of the three-dimensional solubility parameters, namely, the Hansen solubility parameter, provided detailed information on the mechanism of the dispersion of TiO₂—COOH. Because of the carboxylic acid groups exhibited on the surface of the titania nanocrystals, the dispersion of TiO₂—COOH was very much affected by the hydrogen-bonding ability of the solvent. The hydrogen-donating/-accepting ability adequately described the dispersion of TiO₂—COOH in organic solvents.