摘要
以十二烷基硫酸钠(SDS)为表面改性剂,用溶胶凝胶方法制备出无定型改性纳米氧化钛颗粒,平均粒径为100 nm．颗粒表面改性极大地提高了纳米氧化钛与硅油的浸润性和所配制电流变液的力学性能．颗粒浓度为3．0 g／ml时,材料显示最佳的电流变效应,其静态剪切应力值可达130 kPa(4 kV／mm直流电场)．与微米电流变液比较,纳米电流变液的抗沉降性能有较大的改善．颗粒的纳米粒径尺度、与基液良好的润湿性是形成改性纳米颗粒强电流变效应的主要原因．
The SDS-modified titania nano-particles were prepared by the sol-gel method, which showed the good oleophilicity and the strong ER effect. The average size of the spherical modified particles is about 100nm. The wettability curve slope of modified particles was as five times as that of unmodified particles. With the improvement of dispersing and contact state, the ER fluid showed the best ER effect and its static yield stress was over 130 kPa when its particle concentration was 3.0 g/ml under 4 kV/mm DC. Furthermore, this ER fluid was also found to show excellent suspended stability. The particles with nano-scale size and good wettability to the oil medium are importance for the strong ER effect.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2006年第4期417-421,共5页
Chinese Journal of Materials Research
基金
国家自然科学基金50272054
国家杰出青年基金50025207
西北工业大学博士创新基金CX200515资助项目.~~
关键词
无机非金属材料
纳米氧化钛
表面改性
浸润性
强电流变效应
inorganic non-metallic materials, nano-titania, surface-modification, oleophilicity strong electrorheological effect
