1. Nanoparticle
Process Technology and Center for Nanointegration Duisburg-Essen (CENIDE), University of Duisburg-Essen, 47057 Duisburg, Germany
2. Department
of Chemical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
3. Optical
Materials Engineering Laboratory, ETH Zurich, 8092 Zurich, Switzerland