1. Department of Chemical and Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06269, USA
2. Polymer Program, Institute of Material Sciences, University of Connecticut, Storrs, Connecticut 06269, USA
3. Canadian Neutron Beam Centre, National Research Council Canada, Chalk River Laboratories, Chalk River, Ontario K0J 1J0, Canada
4. Department of Physical Chemistry of Drugs at Faculty of Pharmacy, Comenius University, 832 32 Bratislava, Slovakia
5. Frank Laboratory of Neutron Physics at Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
6. Department of Biomedical Engineering, University of Connecticut, Storrs, Connecticut 06269, USA