1. Biomedical Materials Group, Institute of Pharmacy, Martin Luther University Halle−Wittenberg, Heinrich Damerow Strasse 4, 06120 Halle (Saale), Germany
2. Interdisciplinary Center of Material Research, Martin Luther University Halle−Wittenberg, Heinrich Damerow Strasse 4, 06120 Halle (Saale), Germany
3. Fraunhofer Institute for Microstructure of Materials and Systems, Walter-Hülse-Strasse 1, 06120 Halle (Saale), Germany
4. Institute of Physics, Martin Luther University Halle−Wittenberg, 06099 Halle (Saale), Germany