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초록

Electrorheological behavior of suspensions using three diffderent carbonaceous particles was observed from various characterization methods. These differnt carbonaceous particle possess different oxygen content and weae prepared by thermal treatment All were from mesophase pitch which were cationic polymerized with naphthalene and HF/BF3 under high temperature (500~700 C). Special attention was put on different variables effecting on ER properties such as current density, temperature, electric field and weight fraction. We also measured the change of shear stress and shear viscosity from 20 C to 100 C to abserve the durability of carbonaceous ER fluid.