摘要
以改性的TiO2粒子为显色粒子,四氯乙烯为分散介质,油溶红为染料,加入分散剂制备了电泳显示液。选用不同类型的有机表面活性剂和硅烷偶联剂对纳米TiO2粒子进行表面改性。用红外光谱(FT-IR)表征了改性粒子的表面组成和结构,并通过透射电镜(TEM)观察了粒子的形态、粒径及分散情况。采用静态沉降法考察了改性后的粒子在四氯乙烯中的分散稳定性,并利用自行设计的电泳仪对粒子的电场响应特性进行了测试。结果表明,用阴离子表面活性剂十二烷基苯磺酸钠(SDBS)改性的粒子其分散稳定性和带电性最好。随后探讨了SDBS用量和反应时间对粒子分散性和带电性的影响,得到改性的最佳工艺条件为:改性剂用量为TiO2含量的15%,反应时间为1 h。改性后的粒子分散性和带电性有明显的提高,粒子对电场有可逆响应且具备一定的双稳性。
Titanium dioxide was surface modified by organic species in order to prepare materials for use in stable electrophoretic inks （E Ink） also containing Oil Soluble Red, a dispersant and tetrachloroethylene （TCE）. The modified materials were characterized by Fourier transform infrared spectroscopy （FT-IR）. The electrophoretic properties of samples in TCE were investigated by static sedimentation experiments and electrophoresis. The type of organic material used for the surface modification influences both dispersibility and charge properties of the particles. On the whole, particles modified by anionic surfactants show superior properties. The processing conditions were investigated in detail using sodium dodecylbenzene sulfonate （SDBS） as the modifier. The re- sults show that the settling time of the modified TiO2 can exceed 200 h with a response time of 30 s under opti- mized modification conditions where the proportion of surfactant is 15 % and reaction time is 1 h. This suggests that SDBS-modified TiO2 is suitable for use as an electrophoretic material.
出处
《北京化工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第3期11-14,共4页
Journal of Beijing University of Chemical Technology(Natural Science Edition)
基金
国家'863'计划(2004AA302010)
教育部重大项目(305005)
关键词
二氧化钛
有机改性
分散性
带电性
titanium dioxide
organic modification
dispersibility
charge properties
