1. Institute for Fiber Engineering, Shinshu University (IFES) Interdisciplinary Cluster for Cutting Edge Research (ICCER) Shinshu University 3‐15‐1 Tokida Ueda Nagano 386‐8567 Japan
2. Division of Molecular ScienceGraduate School of Science and Technology Gunma University 1‐5‐1 Tenjin‐cho Kiryu Gunma 376‐8515 Japan
3. Department of Textile Science and TechnologyGraduate School of Science and Technology Shinshu University 3‐15‐1 Tokida Ueda Nagano 386‐8567 Japan