Dielectrophoresis Force and the Electromechanical Responses of Elastomers
In our research, we investigated the electrorheological responses and dielectrophoresis force of the six elastomers at various electric field strengths and temperatures. For the electrorheological responses, the effect of temperature, between 300 and 370 K, on the storage modulus responses (ΔG′2kV/mm) and on the dielectric constants of elastomers were investigated under applied electric field strengths varying from 0 to 2 kV/mm. The acrylic elastomers (AR70, AR71, and AR72) have positive storage modulus responses and sensitivities with increasing temperature and dielectric constant. In the case of styrene copolymers (SAR, SBS, and SIS), the storage modulus responses and sensitivities increase and attain the maximum at the glass transition temperature of the hard segment. We studied the dielectrophoresis forces of the six elastomers by measured deflection distance under various electric field strengths (0–600 V/mm) and calculated the force from non-linear deflection theory of the cantilever. The results show that the dielectrophoresis forces of the six elastomers increase with increasing electric field strength. The acrylic elastomer AR71 had the lowest electrical yield point (75 V/mm) and it generated the highest force (389 μN at E = 600 V/mm). On the other hand, SIS had highest electrical yield point (400 V/mm) and it generated the lowest force (67 μN at E = 600 V/mm). The dielectrophoresis forces depend on many factors, such as dielectricity, conductivity, and storage modulus of the elastomers.
Pietro VINCENZINI and Giuseppe D'ARRIGO
R. Kunanuruksapong and A. Sirivat, "Dielectrophoresis Force and the Electromechanical Responses of Elastomers", Advances in Science and Technology, Vol. 54, pp. 114-119, 2008