Synthesis and electrorheological properties of polar molecule-dominated TiO2 particles with high yield stress
Synthesis and electrorheological properties of polar molecule-dominated TiO2 particles with high yield stress
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DOI：
10.1007/s00397-010-0452-y
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发表时间：
2010-04
期刊：
影响因子：
2.3
通讯作者：
Xuehui Liu;Jianjun Guo;Yuchuan Cheng;Gaojie Xu;Yong Li;P. Cui
中科院分区：
文献类型：
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作者：
Xuehui Liu;Jianjun Guo;Yuchuan Cheng;Gaojie Xu;Yong Li;P. Cui
采用简单的溶胶-凝胶法合成了两种不同粒径的非晶态二氧化钛粒子，并用X射线衍射仪、场发射扫描电子显微镜和傅里叶变换红外光谱对其进行了表征。电流变测试结果表明，二氧化钛/硅油悬浮液具有显著的电流变效应。室温下，在4千伏/毫米的直流电场下，静态剪应力最高可达130千帕(剪切率为0.2%S− 1)。粒子表面的极性分子对观察到的巨型电流变效应起着决定性的作用，这种效应是由相邻粒子之间的极性分子在空隙中的排列引起的。
Two types of amorphous TiO2particles with different particle sizes were synthesized by a simple sol–gel method and were characterized by X-ray diffraction analysis, field emission scanning electron microscopy, and Fourier transform infrared spectrometry. The electrorheological (ER) results show that the TiO2/silicone oil suspensions exhibited a remarkable ER effect. The static shear stress can be up to 130 kPa (shear rate 0.2 s− 1) under the DC electric field of 4 kV/mm at room temperature. The polar molecules present on the particles’ surface play a decisive role for the observed giant ER effect, which arises from the alignment of polar molecules in the gap between neighboring particles.