Patent ID: 6235185
Filing Date: 2001-05-22
Classification: C25B

Abstract:
A method of producing ultrafine particles of a metal oxide, comprising the steps of:providing an electrolytic bath having an anode and a cathode and partitioned into chambers by at least one ion exchange layer;providing an electrolytic solution containing metal ions as a starting material for the ultrafine metal oxide particles in a chamber on the anodic side of one ion exchange layer;providing an alkaline electrolytic solution in a chamber on the cathodic side of the ion exchange layer; andapplying a voltage between the anode and the cathode to cause the metal ions to transfer from the anodic side chamber to the cathodic side chamber through the ion exchange layer, whereby the ultrafine metal oxide particles having diameters of not greater than 1 .mu.m are precipitated in the alkaline electrolytic solution in the cathodic side chamber.