1. Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan
2. Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan
3. Materials Characterization Laboratories, Toray Research Center Inc., 3-7, Sonoyama 3-chome, Otsu, Shiga 520-8567, Japan