1. Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, CH-8093 Zurich, Switzerland, BMG Engineering AG, Ifangstrasse 11, CH-8952 Schlieren, Switzerland, Zurich University of Applied Sciences, Schloss, CH-8820 Wädenswil, Switzerland, and Electron Microscopy ETH Zurich (EMEZ), CH-8093 Zurich, Switzerland