Abstract
A new method is proposed for the measurement of zeta potential of particles dispersed in insulating solvent such as developers used in electrophotography. It is theoretically expected that the electrophoretic deposition current between two parallel electrodes and absorbance of the liquid decay exponentially during the process of electrophoresis, provided that the drift velocity of toner particles is sufficiently lower than their diffusion velocity. The transit time can be determined directly from the time constant of the decay of current or absorbance. The zeta potential of particle can be calculated from the above values of transit time and measured values of viscosity and the dielectric constant of the solvent. The other parameters of toner particles, such as mass, radius and electric charge, can also be determined. This theory has been verified by the experimental results.
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