1. EMPI, Institute for Energy and Materials Processes─Fluid Dynamics, University of Duisburg-Essen, 47057 Duisburg, Germany
2. EMPI, Institute for Energy and Materials Processes─Reactive Fluids, University of Duisburg-Essen, 47057 Duisburg, Germany
3. CENIDE, Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, 47057 Duisburg, Germany