Studies on the Removal of Soil Particles by Electro-osmotic Flow

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Abstract
The removal of soil particles from the capillary walls of cotton cloth was investigated by using electro-osmotic washing method. A cotton cloth soiled with iron (III) oxide or polystyrene latex particles was held between two plastic plates which had windows at the center and dipped in a washing bath.When an electric field was applied perpendicularly to the cloth by setting titanium electrodes and applying alternating current, the electro-osmotic flow took place in the capillaries of the cloth and hence the particles were removed from capillary walls. Zeta-potentials of particles and cloths were measured by ultramicro-electrophoresis and streaming potential methods respectively. The relative hydrodynamic force by electro-osmosis was estimated on the basis of Bernoulli theorem and the total potential energies of interaction between particles and fibers were calculated on the basis of heterocoagulation theory. It was found that the detergent efficiency depended on the magnitude of potential barrier for the removal of particles (VTmax - VTmin) and the strength of electric field. The results obtained suggest that the electro-osmotic flow in capillaries of cloths acts effectively in producing the force to remove soil particles from walls.

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