1. Institute of Physics, University of Tartu, W.Ostwaldi 1, Tartu 50411, Estonia
2. Laboratory of Advanced Fibers, Department of Materials Meet Life, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland
3. Laboratory for Particles-Biology Interactions, Department of Materials Meet Life, Swiss Federal Laboratories for Materials Science and Technology (Empa), Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland
4. Nanoparticle Systems Engineering Laboratory, Institute of Energy and Process Engineering (IEPE), Department of Mechanical and Process Engineering (D-MAVT), ETH Zurich, Sonneggstrasse 3, Zurich 8092, Switzerland
5. National Institute of Chemical Physics & Biophysics, Akadeemia tee 23, 12618, Tallinn, Estonia
6. Institute of Molecular and Cell Biology, University of Tartu, Riia 23, 51010 Tartu, Estonia