Properties of aniline-modified strontium titanyl oxalate-based electrorheological suspension
Properties of aniline-modified strontium titanyl oxalate-based electrorheological suspension
复制标题
苯胺改性草酸钛锶基电流变悬浮液的性能
DOI：
10.1088/0964-1726/23/7/075018
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发表时间：
2014-07-01
影响因子：
4.1
通讯作者：
Qi, Min
中科院分区：
文献类型：
--
作者：
Niu, Chenguang;Dong, Xufeng;Qi, Min
采用沉淀法制备苯胺改性草酸钛锶（STO）颗粒。通过X射线衍射分析、傅里叶变换红外光谱法和热重分析来分析颗粒的结构。使用扫描电子显微镜分析颗粒的形态。结果表明 STO 和苯胺之间形成了化学键。通过调节苯胺与Ti的摩尔比，苯胺改性STO颗粒的形貌可以是球形、多面体以及由纳米颗粒簇和微米棒状颗粒组成的混合物。测试了基于纯 STO 和苯胺改性 STO 的 ER 流体的电流变 (ER) 性能、温度效应、触变性和沉降稳定性。结果表明，所有性能很大程度上取决于颗粒制造过程中苯胺的含量。苯胺/Ti摩尔比为2的电流变液在温度变化时表现出最高的剪切应力、屈服应力、漏电流密度和最稳定的电流变行为。原因是颗粒具有多面体形态并吸收了极性苯胺分子。由于苯胺/Ti摩尔比为3的颗粒形成稳定的空间网格结构，电流变液比其他液体表现出更好的触变性和沉降稳定性。
Aniline-modified strontium titanyl oxalate (STO) particles were fabricated with a precipitation method. The structures of the particles were analyzed by x-ray diffraction analyses, Fourier transform infrared spectrometry and thermogravimetric analysis. Scanning electron microscopy was used to analyze the morphology of the particles. The results indicate chemical bonds are formed between STO and aniline. By tuning the molar ratio of aniline to Ti, the morphology of the aniline-modified STO particles can be sphere, polyhedron and a mixture composed of clusters of nano particles and micro rod-like particles. Electrorheological (ER) properties, temperature effect, thixotropy and sedimentation stability of the ER fluids based on the pure STO and the aniline-modified STO were tested. The results indicate all the properties strongly depend on the content of the aniline during the fabrication process of the particles. The ER fluid with a molar ratio of aniline/Ti of 2 presents the highest shear stress, yield stress, leak current density and the most stable ER behavior at changing temperatures. The reason is the particles have polyhedron morphology and absorbed polar aniline molecules. Because of the stable space grid structure formed by the particles with a molar ratio of aniline/Ti of 3, the ER fluid exhibits better thixotropy and sedimentation stability than the others.