Abstract
Electrorheological fluid stably dispersing surfactant coated barium tianante and magnetic fluid dispersing surfactant coated magnetite have been mixed. This mixure (Magneto-electrorheological fluids) is that ultrafine barium titanate and magnetite (size=10nm) are stably dispersed in insulated oil. The magnetite particles make elongated agglomerates in the dirrection of magnetic field and barium titanate ones make agglomerates in the direction of electric field in the oil. The mixed fluid have been thinly sandwiched between transparent electrodes. This thin fluid film can penetrate visible ray under no electrric field and scatter visible ray under electric filed in the direction perpendicular to the plane of the thin film. Response time until scattering the visible ray by applying electric field depends on the fluid viscosity and decay time until penetrating it in the initial state can be shortened by not only Brownian motion but also applying magnetic field in the direction parallel to the thin film.
