1. Department of Bioproducts and Biosystems, Aalto University, Vuorimiehentie 1, P.O. Box 16300, Espoo, FI-00076 Aalto, Finland
2. Key Centre for Polymers and Colloids, School of Chemistry, and The University of Sydney Nano Institute (Sydney Nano), The University of Sydney, Sidney, 2006 NSW, Australia
3. Department of Applied Physics, Aalto University, Puumiehenkuja 2, P.O. Box 13500, Espoo, FI-00076 Aalto, Finland