Chiral catalytic activities in magnetoelectrochemical etching

R. Aogaki^{1, 8} - R. Morimoto² - M. Asanuma³ - I. Mogi⁴ - A. Sugiyama⁵ - M. Miura⁶ - Y. Oshikiri⁷ - Y. Yamauchi⁸

¹ Polytechnic University, 2-20-12-1304, Ryogoku, Sumida-ku, Tokyo 130-0026, Japan
² Saitama Prefectural Showa Water Filtration Plant, 100 Shinjukushinden, Kasukabe, Saitama 344-0113, Japan
³ Yokohama Harbour Polytechnic College, 1 Honmokufuto, Naka-ku, Yokohama 231-0811, Japan
⁴ Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
⁵ Institute for Nanoscience and Nanotechnology, Waseda University, 513 Waseda-tsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan
⁶ Hokkaido Polytechnic College, 3-190 Zenibako, Otaru, Hokkaido 047-0292, Japan
⁷ Yamagata College of Industry and Technology, 2-2-1 Matsuei, Yamagata-shi, Yamagata 990-2473, Japan
⁸ National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

Abstract
Chiral catalytic activities of electrode surfaces fabricated by magnetoelectrochemical etching without oxygen adsorption in a vertical magnetohydrodynamic (MHD) flow have been theoretically examined. Then, the following points were clarified: under anionic specific adsorption, such activities arise from the screw dislocations of 2D pits. Their chirality is donated by microscopic vortexes termed micro-MHD flows, which are formed on the free surfaces covered with ionic vacancies. As a result, under upward (+) and downward (--) magnetic fields, D (dextrorotatory)- and L (levorotatory)-activities appear, respectively. Figs 11, Refs 12.