Kang Su Hyung, Choi Hyoung Jin
Department of Polymer Science and Engineering, Inha University, Incheon 22212, Korea.
Program of Environmental and Polymer Engineering, Inha University, Incheon 22212, Korea.
Materials (Basel). 2021 Dec 23;15(1):101. doi: 10.3390/ma15010101.
ZnFeO particles initially synthesized through a simple solvothermal method were coated using polyindole (PIn) to prepare an actively controllable core-shell typed hybrid material under both electric and magnetic fields. An advantage of this process is not needing to add the stabilizers or surfactants commonly used for uniform coating when synthesizing core or shell-structured particles. The synthesized ZnFeO/PIn particles have a lower density than conventional magnetic particles and have suitable properties as electrorheological (ER) particles. The expected spherical shape of the particles was proven using both scanning electron microscopy and transmission electron microscopy. The chemical characterization was performed using Fourier-transform infrared spectroscopy and X-ray diffraction analysis. To analyze the rheological properties, a ZnFeO/PIn based suspension was prepared, and dynamic rheological measurements were performed for different electric field strengths using a rotary rheometer. Both dynamic and elastic yield stresses of the ER fluid had a slope of 1.5, corresponding to the conductivity model. Excellent ER effect was confirmed through rheological analysis, and the prepared ER fluid had a reversible and immediate response to repeated electric fields.
最初通过简单的溶剂热法合成的ZnFeO颗粒用聚吲哚（PIn）进行包覆，以在电场和磁场下制备一种可主动控制的核壳型混合材料。该过程的一个优点是在合成核或壳结构颗粒时无需添加通常用于均匀包覆的稳定剂或表面活性剂。合成的ZnFeO/PIn颗粒的密度低于传统磁性颗粒，并且具有作为电流变（ER）颗粒的合适性能。使用扫描电子显微镜和透射电子显微镜都证明了颗粒预期的球形形状。使用傅里叶变换红外光谱和X射线衍射分析进行化学表征。为了分析流变性能，制备了基于ZnFeO/PIn的悬浮液，并使用旋转流变仪对不同电场强度进行了动态流变测量。ER流体的动态屈服应力和弹性屈服应力都有一个1.5的斜率，与电导率模型相对应。通过流变分析证实了优异的ER效应，并且制备的ER流体对重复电场具有可逆且即时的响应。
