Abstract
A solid particle in an oil phase under a direct current voltage exhibited two types of motions: revolving and spinning. Its kinetic energy output as a micromotor was quantified based on Stokes’ drag and viscous torque. With the use of this method, the dependence of a micromotor’s energy output on the applied voltage and solute concentration are discussed in this paper. The electric energy input to the system is calculated, and the energy conversion efficiency is discussed. The quantification of energy conversion efficiency of micromotor systems enables researchers to discuss the micromotor systems with different particles, solutions, experimental setup, etc., on a common base. This makes the comparison of micromotors between different studies possible and will accelerate the development of micromotor systems. • A solid microparticle showed motions between electrodes. • The revolving motion was driven by viscous drag. • The spinning motion was driven by viscous torque. • The energy conversion efficiency was calculated based on the output and input power.
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