| TiO2在水及丙二醇介质中表面电性质的研究 |
| Study on Surface Charge Properties of Titanium Dioxide in Water and Propylene Glycol |
| 作者 | 单位 | | 刘付胜聪 | 湖南大学材料科学与工程学院,长沙,410082 | | 李玉平 | 湖南大学材料科学与工程学院,长沙,410082 | | 胡智荣 | 湖南大学材料科学与工程学院,长沙,410082 | | 卢 君 | 湖南大学材料科学与工程学院,长沙,410082 | | 肖汉宁 | 湖南大学材料科学与工程学院,长沙,410082 |
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| 摘要: |
| 关键词: TiO2 丙二醇 表面电性质 质子迁移 |
| 基金项目: |
| Abstract: Surface charge properties of titanium dioxide in water and propylene glycol have been discussed by proton-transfer phenomena.Electrophoresis shows significant differences between each type of titanium dioxide particles and between the two dispersion media.In aqueous solvent,the sign of the charge for titanium dioxide would change due to pH and surface chemical composition.However,in propylene glycol pH value could not result in the sign of the charge for uncoated titanium dioxide. Furthermore,the change due to pH and surface chemical composition. However, in propylene glycol pH value could not result in
the sign of the charge for uncoated titanium dioxide. Furthermore, the
effects of both alumina and silica coatings and media on the surface charge properties of titanium dioxide are due to proton-transfers. The acidity of hydroxyl groups on oxides surface is believed to be the direct reason that make them have different charge properties in solvents. It is favorable for the hydroxyl groups on the surface of particles to donate protons, as was observed by negative charge pertaining for dispersion in water at most values of pH. While in propylene glycol titanium dioxide particles are forced to accept protons, resulting in positively charged particles. Small amounts of water have a significant effect on the sign of the charge for uncoated titanium dioxide. |
| Keywords: titanium dioxide propylene glycol surface charge property proton-transfer |
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| 刘付胜聪,李玉平,胡智荣,卢 君,肖汉宁.TiO2在水及丙二醇介质中表面电性质的研究[J].无机化学学报,2004,20(1):79-83. |
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