1. Kao Corporation, 1334, Minato Wakayama-shi, Wakayama 640-8580, Japan
2. Institute for Materials Chemistry and Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
3. ERATO Takahara Soft
Interfaces Project, Japan Science and Technology Agency, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan