| 摘要 |
PURPOSE:To obtain the titled substrate having superior adsorbing power and suitable for use as the material of a stationary phase for chromatography by anodically oxidizing the surface of an Al or Al alloy substrate at high current density in a prescribed soln. and by treating the oxidized surface with colloid. CONSTITUTION:An Al or Al alloy substrate is immersed in a prescribed soln. at 20-60 deg.C, and the surface of the substrate is anodically oxidized at 5-60A/dm<2> high current density at which electric discharge is not caused between the substrate and the soln. The oxidized surface is treated with colloidal oxide or sulfide of Mg, Al or the like. By this method, the resulting oxide film is provided with a three-layered structure consisting of a barrier layer, a porous layer and a layer having an acicular structure, and colloidal particles are physically adsorbed on the layer having the acicular structure to give an increased specific surface area. Accordingly, the capillary action and permeability of the substrate to various solns. are improved, and superior surface activity is given. |
