分别以阴、阳离子表面活性剂和聚合物作为表面修饰剂, 以四氯乙烯、十二烷基苯和Isopar H作为分散介质, 研究纳米TiO2电泳粒子表面荷电性质及其荷电量的可控制备. 研究结果表明，阳离子表面活性剂修饰的TiO2粒子的ξ电位在四氯乙烯中呈负性, 在十二烷基苯和Isopar H中呈正性; 阴离子表面活性剂的修饰产物则相反. 进一步研究了十二烷基苯磺酸钠、十六烷基三甲基溴化铵和苯乙烯/二乙烯苯修饰的TiO2粒子体系中电荷控制剂的浓度对TiO2粒子荷电量的影响. 结果表明TiO2电泳粒子的ξ电位在电荷控制剂的临界胶束浓度附近存在极小值, 并随着浓度的增加而有规律地变化, 但荷电性质不改变. 根据这一规律可实现对粒子表面电荷的可控制备.
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
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