S-1 Supporting Information Interaction Between Soft Nanoparticles and Phospholipid Membranes – Effect of the Polymer Grafting Density on Nanoparticle Adsorption Marek Sokolowski, 1 Zehra Parlak, 2 Christopher Bartsch, 1 Stefan Zauscher, 2 * Michael Gradzielski 1 * 1 Stranski Laboratorium für Physikalische Chemie, Technische Universität Berlin, Straße des 17 Juni 124, 10623 Berlin, Germany *michael.gradzielski@tu-berlin.de 2 NSF Research Triangle Materials Research Science and Engineering Center, Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA *zauscher@duke.edu