1. Department
of Textiles, Ghent University, Technologiepark-Zwijnaarde 907, B-9052 Zwijnaarde, Belgium
2. Department of Materials Science and Engineering, Ghent University, Technologiepark-Zwijnaarde 903, B-9052 Zwijnaarde, Belgium
3. Department
Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium