纳米TiO_2电泳粒子表面电荷的可控制备  

Preparation of TiO_2 Nano-particles with Controllable Surface Charges for Electrophoretic Display

作　　者：柳志杰[1] 李祥高[1] 王世荣[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《无机材料学报》2012年第6期649-654,共6页Journal of Inorganic Materials

基　　金：国家863计划(2008AA03A332);天津市科技支撑计划(11ZCKFGX01700)~~

摘　　要：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 TiO2nano-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 TiO2nano-particles can be achieved.

关 键 词：TiO2粒子 荷电性质 荷电量 可控制备 电泳 

分 类 号：TQ134[化学工程—无机化工] O648[理学—物理化学]