The forces that determine the a.c. electrokinetics of microparticles depend on the relative dielectric properties of the particles or biological cells with respect to their suspending media. A method for measurement of the properties of very small quantities of medium is therefore desirable.A suitable measurement chamber consisting of a planar interdigitated electrode array surrounded by an insulating pedestal can be fashioned by lithographic and micro-machining techniques. Volumes of 1μl or even less are measurable. The original purpose of the electrode structures, namely to microposition particles and single cells, is also described.
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