1. Laboratory of Physical Chemistry and Colloid Science, Wageningen University and Research Center, Dreijenplein 6, 6703 HB Wageningen, The Netherlands
2. Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands
3. Department of Physics, Harvard University, Cambridge, Massachusetts 02138
4. Biobased Products, Agrotechnology & Food Sciences Group, Wageningen University and Research Center, Bornsesteeg 59, 6708 PD Wageningen, The Netherlands