30A-B-2 Method for Measuring the Specific Gravity of a Particle to Calculate Its Dielectrophoretic Force(Dielectrophoretic Approach to Biomedical Applications)

概要

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Dielectrophoresis (DEP) is the motion of a matter caused by polarization effects in a non-uniform electric field. We have been studying to measure dielectrophretic force (DEP force) generated on a small particle by equipment which we developed. For calculating the DEP force, the specific gravity (mass density) of the target particle in the DEP device is necessary. In this paper we propose to measure the mass density of small particles with the "terminal velocity ". The terminal velocity of the polystyrene particle in the DEP device was measured. In θ=90°, we could not obtain the terminal velocity until 360 sec, because it seemed to fall "irregularly ". In order to solve the problems, how to measure the terminal velocity of a particle was proposed by us. This procedure gave us the mass density of polystyrene particle. This error of estimated value of mass density is up to 4%. The larger the particle size, the smaller the error.
2011-10-29