:Prevention of Contamination from Electrodes by Using Titanium-Electrodes and Alternating Current

概要

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Experiments were carried out to remove soil particles from the capillary walls of cloth by electro-osmosis. One of the most important problems in the experiments was to prevent the contamination from carbon electrodes. By using titanium plates as electrodes, the problem could be perfectly solved. The apparatus and method were as follows : A soiled cloth was held between two perforated plastic plates and dipped in a wash bath, and electro-osmotic flow took place when an electric field was applied perpendicularly to the cloth by using the titanium electrodes changing the polarity every 15 sec. Three kinds of soiled cloth, cotton cloth soiled with carbon black or clay and polyester cloth soiled with carbon black were used in the electrokinetic washing experiments, and their zeta potentials were measured by streaming potential method, by which the electro-osmotic flow rate in the capillaries was estimated. Experimental results thus obtained were discussed under the theory derived on the basis of electrokinetic, hydrodynamic and the DLVO theories as a first approximation.
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