| 초록 |
Various earth-alkaline metal-doped hollow silica/titania spheres (EM-HST) are successfully synthesized via simple sonication-mediated etching and re-deposition method to investigate effect of EM-doping on electrorheological (ER) activity. In particular, three kinds of earth-alkaline metal hydroxides are used as etchant to fabricate earth-alkaline metal (Ca, Sr, Ba)-doped hollow silica/titania spheres. Notably, this facile etching method effectively enhanced both dispersion stability and dielectric property of ER materials in one-step method. Under our experimental condition, Ca-doped hollow silica/titania sphere exhibits six-fold higher ER performance compared to non-metal doped hollow silica/titania sphere due to short band gap of Ca metal. This newly designed experiment suggests simple methods to enhance the ER performance effectively using various earth-alkaline metal hydroxides. |
