1. Research Initiative for Supra-Materials, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
2. Department of Materials Chemistry, Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
3. Central Research Laboratories, DIC Corporation, 631, Sakado, Sakura, Chiba 285-8668, Japan