| 초록 |
In this study, mesoporous silica (mSiO2) particle with various aspect ratios was fabricated by simple modified Stöber method to investigate the geometrical effect on the electrorheological performance. Particularly, three kinds of mSiO2 particles are fabricated as sphere, short-rod, and long-rod with aspect ratio of 1, 2, and 3, respectively. Notably, the mSiO2-based ER fluids showed enhanced ER performance with increasing aspect ratio; such a phenomenon was related to the flow resistance and mechanical stability of fluids. Also, the dielectric property of mSiO2-based ER fluids was investigated to reveal the geometrical effect on interfacial polarization of particles according to the dielectric loss model. This simply designed study suggests a facile method to enhance the ER activity with controlling the aspect ratio of material. |
