Abstract
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.
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