College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
Dalton Trans. 2013 Jul 21;42(27):10042-55. doi: 10.1039/c3dt50504a. Epub 2013 May 28.
Flower-like BaTiO3/Fe3O4 hierarchically structured particles composed of nano-scale structures on micro-scale materials were synthesized by a simple solvothermal approach and characterized by the means of X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), magnetic testing and rotary viscometer. The influences on the morphology and structure of solvothermal times, type and amount of surfactant, EG : H2O ratio, etc. were studied. Magnetic testing results show that the samples have strong magnetism and they exhibit superparamagnetic behavior, as evidenced by no coercivity and the remanence at room temperature, due to their very small sizes, observed on the M-H loop. The saturation magnetization (M(s)) value can achieve 18.3 emu g(-1). The electrorheological (ER) effect was investigated using a suspension of the flower-like BaTiO3/Fe3O4 hierarchically structured particles dispersed in silicone oil. We can observe a slight shear-thinning behavior of shear viscosity at a low shear rate region even at zero applied electric field and a Newtonian fluid behavior at high shear rate regions.
花状 BaTiO3/Fe3O4 分级结构粒子由纳米结构组成，在微尺度材料上，通过简单的溶剂热法合成，并通过 X 射线粉末衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、磁测试和旋转粘度计进行了表征。研究了溶剂热时间、表面活性剂种类和用量、EG:H2O 比等对形貌和结构的影响。磁测试结果表明，由于其尺寸非常小，在 M-H 回路上观察到，样品具有强磁性，并表现出超顺磁性行为，即室温下没有矫顽力和剩余磁化强度。饱和磁化强度（M(s)）值可达 18.3 emu g(-1)。使用分散在硅油中的花状 BaTiO3/Fe3O4 分级结构粒子悬浮液研究了电流变（ER）效应。即使在零外加电场下，在低剪切速率区域也可以观察到剪切粘度的轻微剪切变稀行为，而在高剪切速率区域则表现出牛顿流体行为。
