苯胺-SrTi(C2O4)2颗粒制备及其电流变性能

用沉淀法制备了苯胺-草酸氧钛锶（SrTi（C₂O₄）₂）颗粒。FTIR分析表明，苯胺已引入到SrTi（C₂O₄）₂颗粒的表面；XRD分析表明，苯胺-SrTi（C₂O₄）₂颗粒为含少量结晶的无定形态。采用SEM观察颗粒的形貌，结果表明，随反应体系中苯胺与钛原子物质的量比n_aniline/n_Ti的增大，苯胺-SrTi（C₂O₄）₂颗粒由近似球状（n_aniline/n_Ti =0）变为多面体状（n_aniline/n_Ti =2），而后变为棒状与团簇状颗粒的混合体系（n_aniline/n_Ti =3）。以苯胺-SrTi（C₂O₄）₂颗粒为分散相制备颗粒质量分数为66.7%电流变液，电流变性能测试结果表明，在n_aniline/n_Ti =2时，电流变液具有较高的剪切应力和剪切屈服强度、较大的漏电流密度。苯胺在颗粒制备过程中起控制颗粒形貌的作用，在电流变液体系中起极性分子的作用，其对苯胺-SrTi（C₂O₄）₂电流变液性能的影响是两种效应综合作用的结果。

Synthesis and electrorheological properties of aniline-SrTi(C2O4)2 particles

The aniline-strontium titanyl oxalate (aniline-SrTi(C₂O₄)₂) particles were prepared by a precipitation method. FTIR patterns show that aniline has been added to the surface of the SrTi(C₂O₄)₂ particles. XRD patterns indicate that the particles are amorphous structure with a little of crystallization. The morphology of the particles was observed by SEM, the results of which indicate that with the increase of the molar ratio of aniline toTi atoms, n_aniline/n_Ti, the smorphology of aniline-SrTi(C₂O₄)₂ particles change from approximate globular (n_aniline/n_Ti =0) to a polyhedron shape (n_aniline/n_Ti =2), and then a mixure consists of rod and cluster shaped particles (n_aniline/n_Ti =3). The electrorheological (ER) fluids were prepared with 66.7% mass fraction of aniline-SrTi(C₂O₄)₂ particles with different aniline contentand tested. The experimental results indicate that the ER fluid prepared by the particles with a molar ratio of n_aniline/n_Ti =2 present the largest field-induced shear stress, yield stress and leak current density. The aniline controls the particle morphology during the preparation of the particles, and acts as polar molecules in the ER fluids system. The influence of the aniline on properties of the ER fluids is a combined effect of the two roles.