Rice husk-based nano-sized silica particles were prepared using both acid and thermal treatment methods for applications to electro-responsive electrorheological (ER) fluids when dispersed in silicone oil. The morphology of the nano-sized silica particles was observed by scanning electron microscopy, and their chemical structure and thermal stability were examined by Fourier-transform infrared spectroscope and thermo-gravimetric analysis, respectively. The ER properties of the nano-sized silica particle-based ER suspension was investigated using a rotation rheometer under various electric field strengths, showing a conduction mechanism with a slope of 1.5 for a plot of the yield stress versus the applied electric field strength. In addition, its shear stresses increased with increased electric field strengths along with ER efficiency and became stable over the entire shear rate range when the electric field reached 2.0 kV/mm. Typical solid-like behaviors of the ER suspension was also confirmed by both higher storage moduli than the loss moduli and shear relaxation modulus property.

使用酸和热处理方法制备了基于稻壳的纳米级二氧化硅颗粒，用于分散在硅油中的电响应性电流变（ER）流体。通过扫描电子显微镜观察纳米级二氧化硅颗粒的形貌，并分别通过傅立叶变换红外光谱仪和热重分析法检查其化学结构和热稳定性。使用旋转流变仪在各种电场强度下研究了纳米级二氧化硅颗粒基ER悬浮液的ER特性，显示了屈服应力与应力的关系曲线的斜率为1.5的传导机理施加的电场强度。此外，其剪切应力随着电场强度的增加以及ER效率的增加而增加，并且在电场达到2.0 kV / mm时在整个剪切速率范围内变得稳定。还通过比损失模量和剪切弛豫模量特性更高的储能模量证实了ER悬浮液的典型固体状行为。