Large enhancement in electrorheological activity of mesoporous cerium-doped TiO₂ from high surface area and robust pore walls

Considering the importance of large interfacial or surface polarization to strong electrorheological (ER) effect, we developd a high surface area mesoporous doped TiO₂ ER material by using block-copolymer. By comparing the ER experiments between samples with mesopore and without mesopore, we demonstrate a very large enhancement in ER activity of mesoporous ER material and its yield stress is 100 times that of the pure TiO₂ ER material and 5-8 times that of single doped TiO₂ without mesoporous structure. We give a preliminary discussion about the improvement in ER activity based on previous dielectric analysis.