1. Institute of Solid State Physics, Graz University of Technology, Petersgasse 16, 8010 Graz, Austria
2. Institute for Pharmaceutical Sciences, Department of Pharmaceutical Technology, Karl-Franzens University of Graz, 8010 Graz, Austria
3. Department of Physics, Department of Chemistry and Biochemistry, Concordia University, H4B 1R6 Montréal, Canada
4. Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16300, 00076 Aalto, Finland
5. Institute of Paper, Pulp and Fiber Technology, Graz University of Technology, 8010 Graz, Austria