Molecule-based electrorheological material assembled using β-cyclodextrin as substrate

Molecule-based electrorheological (ER) materials as a novel type of ER materials, the inclusion compound [H-2(beta-CD-A)-PTA] between p-toluenesulfonic acid (PTA, guest) and H-2(beta-CD-A) (host) that is dicarboxylic acid of beta-cyclodextrin (beta-CD), and the rare earth (RE) complexes [(beta-CD-A)-PTA](3)RE2 (RE=La, Gd, Y) of H-2(beta-CD-A)-PTA, were synthesized. The ER performance and dielectric property of the materials were studied. Our results show that the molecule-based ER materials assembled using beta-cyclodextrin as a substrate, especially the inclusion compound and its rare earth (RE) complexes exhibit clear ER effect. The inclusion PTA can markedly enhance the ER performance of H-2(beta-CD-A) material. The ER activity of the yttrium complex is the highest among these materials. The characteristic of the molecule in molecule-based ER materials is an important factor in influencing ER property.