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首页> 美国卫生研究院文献>Scientific Reports >Self-assembly preparation of SiO2@Ni-Al layered double hydroxide composites and their enhanced electrorheological characteristics
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Self-assembly preparation of SiO2@Ni-Al layered double hydroxide composites and their enhanced electrorheological characteristics

机译：SiO2 @ Ni-Al层状双氢氧化物复合材料的自组装制备及其增强的电流变特性

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摘要

The core-shell structured SiO2@Ni-Al layered double hydroxide (LDH) composites were prepared via self-assembly of Ni-Al LDH on the surface of SiO2 spheres. Only coating a layer of ultrathin Ni-Al LDH sheet, the resulting SiO2@Ni-Al LDH composites exhibit significantly enhanced electrorheological (ER) characteristics compared to conventional bare SiO2 spheres. The monodispersed SiO2 spheres with average diameters of 260 nm were synthesized by the hydrolysis of tetraethyl orthosilicate (TEOS), while the shell part, Ni-Al LDH sheet was prepared by the hydrothermal procedure. The morphology of the samples was investigated via scanning transmission electron microscopy (STEM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The structure of the samples was characterized by X-ray diffraction (XRD). The species and distribution of elements in samples were confirmed by X-ray photoelectron spectroscopy (XPS), Energy dispersive analysis of X-ray (EDX) and elemental mapping in STEM. Subsequently, the ER characteristics of the composites dispersed in insulating oil were characterized by a rotational rheometer. The electric field-stimulated rheological performances (yield stress, viscosity, modulus, etc.) were observed under an external electric field, which is different from the Newtonian state in the free electric field.
机译：通过在SiO2球体表面自组装Ni-Al LDH，制备了核壳结构的SiO2 @ Ni-Al层状双氢氧化物（LDH）复合材料。仅涂覆一层超薄的Ni-Al LDH薄板，与传统的SiO2裸球相比，所得的SiO2 @ Ni-Al LDH复合材料显示出显着增强的电流变（ER）特性。通过原硅酸四乙酯（TEOS）的水解合成平均直径为260nm的单分散SiO2球，而水热法制备壳部分Ni-Al LDH片。通过扫描透射电子显微镜（STEM），扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究样品的形态。样品的结构通过X射线衍射（XRD）表征。通过X射线光电子能谱（XPS），X射线能量色散分析（EDX）以及STEM中的元素映射确认了样品中元素的种类和分布。随后，通过旋转流变仪表征了分散在绝缘油中的复合材料的ER特性。在外部电场下观察到电场刺激的流变性能（屈服应力，粘度，模量等），这与自由电场中的牛顿状态不同。

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