1. Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan, Materials and Chemicals Research Laboratory, Idemitsu Kosan Company Ltd., Chiba, Tokyo, Japan, and Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8505, Japan