Electrorheological fluids comprising dielectric particulates dispersed in a highly electrically insulating oily medium

摘要

The present invention relates to an electrorheological fluid which is capable of increasing viscosity under an application of electric potential difference.PPAn electrorheological fluid according to the present invention comprises dielectric particulates dispersed in a highly electrically insulating oily medium, in which the particulates are carbonaceous particulates having an atomic ratio of carbon atoms to hydrogen atoms (C/H) of 1.70-3.50 and an average particle size of from 0.01 to 100 &mgr;m, and the oily medium is an electrical insulating oil having a dielectric constant of not less than 3 and a volume resistivity of not less than 10.sup.9 &OHgr;·cm.