| 초록 |
Various alkaline earth metal-doped hollow silica/titania particles (EM-HST) are successfully fabricated via sol-gel method followed by sonication-mediated etching and re-deposition (SMER) method to study the effect of metal doping on electrorheological (ER) performance. Particularly, three kinds of alkaline earth metal hydroxides are used to synthesize alkaline earth metal (Ca, Sr, Ba)-doped hollow silica/titania particles. Noticeably, this simple etching method successfully increases both anti-sedimentation and dielectric property of ER fluids in one-step process. In particular, the EM-HST-based ER fluids exhibits higher shear stress compared to the non-metal doped hollow silica/titania- and non-hollow silica/titania-based ER fluids. This experiment suggests a simple method to increase the ER performance by facile etching method. |
