1. Laboratoire d′Étude des Microstructures, ONERA-CNRS, BP 72, 92322 Châtillon CEDEX, France
2. Department of Biotechnology and Chemical Technology, Aalto University School of Chemical Technology, P.O. Box 16100, FI-00076 Aalto, Finland
3. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong
4. Institute of Textiles and Clothing, Hong Kong Polytechnic University, Kowloon, Hong Kong
5. Department of Applied Physics and Center for New Materials, Aalto University School of Science, P.O. Box 15100, FI-00076 Aalto, Finland