Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5-2, 1-1-1 Higashi, Tsukuba 305-8565, Japan, CREST, Japan Science and Technology Corporation (JST), Kawaguchi Center Building, 4-1-8, Honcho, Kawaguchi 332-0012, Japan, and Department of Industrial Chemistry, Faculty of Engineering, and Institute of Colloid and Interface Science, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan (At 2004-08-26)