摘要
在醇盐水解法制备TiO2颗粒的过程中加入尿素,制备TiO2/尿素核壳颗粒.采用SEM 和TEM对颗粒的形貌进行表征,结果表明TiO2/尿素颗粒呈规则球形,粒径为400-500nm,具有良好的单分散性和完整的核壳结构;FT-IR分析表明,尿素成功包覆在TiO2颗粒表面;XRD 分析表明,TiO2/尿素核壳颗粒呈无定形态.分别以TiO2/尿素核壳颗粒和纯TiO2颗粒为分散相制备同浓度的电流变液,性能测试结果表明,TiO2/尿素电流变液比纯TiO2电流变液具有更高的剪切屈服强度,且剪切应力在较宽的剪切速率范围内（〈1000s^-1）保持稳定.
Core-shell-structured TiO2/Urea nanoparticles were synthesized with tetrabutyl titanate and urea by using a hydrolysis method.The microstructure of the particles were observed by scanning electron microscope(SEM)and transmission electron microscopy(TEM),which indicated that the particles are monodispersed sphere(400-500nm)with complete core-shell structure.FT-IR results further proved that the surface of the TiO2 particles is coated with urea.X-ray diffrantion(XRD)results indicated that the particles present amorphous structure.Both TiO2/urea particles and TiO2 particles were used to prepare electrorheological(ER)fluids with the same particles volume fraction.Their ER properties were tested and compared.The results indicated that the TiO2/urea particles-based ER fluid presents much higher yield stress than the pure TiO2 particlesbased material.Besides,the shear stress of the TiO2/urea particles-based ER fluid keeps stable within a wide range of shear rate.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2015年第5期5147-5150,5154,共5页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51108062)
中央高校基本科研业务费专项资金资助项目(DUT13ZD(G)02)
关键词
核壳结构
TIO2
尿素
电流变液
剪切应力
core-shell-structure
TiO2
Urea
electrorheological fluid
shear stress
