Journal of Inorganic Materials ›› 2012, Vol. 27 ›› Issue (6): 649-654.DOI: 10.3724/SP.J.1077.2012.00649

• Research Paper • Previous Articles     Next Articles

Preparation of TiO2 Nano-particles with Controllable Surface Charges for Electrophoretic Display

LIU Zhi-Jie, LI Xiang-Gao, WANG Shi-Rong   

  1. (School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China)
  • Received:2011-07-11 Revised:2011-09-02 Published:2012-06-20 Online:2012-05-07
  • About author:LIU Zhi-Jie. E-mail: liuzhijiesyfx@126.com
  • Supported by:

    National High Technology Research and Development Program of China (2008AA03A332); Tianjin Science and Technology Commission (11ZCKFGX01700)

Abstract: Preparation of TiO2 nano-particles with controllable surface charges for electrophoretic display was investigated in ethylene tetrachloride, Isopar H and dodecylbenzene, in which TiO2 nano-particles were modified by anionic surfactants, cationic surfactants and polymers, respectively. The research results showed that TiO2 nano-particles modified by cationic surfactants had negative charges in ethylene tetrachloride, while it had positive charges in Isopar H and dodecylbenzene, the nano-particles modified by anionic surfactants had the opposite character. The influence of concentration of charge control agents on TiO2 nano-particles surface charges was discussed, in which TiO2 nano-particles were modified by sodium dodecylbenzenesulphonate, hexadecyl trimethyl ammonium bromide and styrene/divinylbenzene, respectively. It was shown that ξ potential of TiO2 nano-particles had a minimum value near the critical micelle concentrations of the charge control agents, and a regular change with the increasing concentration, while the property of ξ potential was still maintained. So, preparation of controllable surface charges of TiO2 nano-particles can be achieved.v

Key words: TiO2 particles, charge property, charge concentration, controllable preparation, electrophoresis

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