Abstract
We found that electrohydrodynamic (EHD) pressure is affected by a combination of surface conditions and shape of electrodes. A smooth surface of electrodes can generate a higher pressure in the low-current region. Under ac electric fields, rhythmic electrochemical oscillation of current is induced in the dielectric liquid C4F9OCH3. From the ac frequency dependence of rhythmic current, two types of relaxation time appeared. The relaxation times correspond to the Helmholtz layer and diffuse layer, which are regarded as an electric double layer. In the case of pressure as a function of ac frequency, a stable, high pressure was obtained using a smooth surface above the relaxation frequency of the diffuse layer.
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