Berlin 2018 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 3: Complex Fluids and Colloids I (joint session CPP/DY)

DY 3.10: Talk

Monday, March 12, 2018, 12:00–12:15, C 264

On effective sphere models for self-diffusion of nonspherical particles — •Felix Roosen-Runge, Jin Suk Myung, Peter Schurtenberger, and Anna Stradner — Division of Physical Chemistry, Lund University, Sweden

Modeling diffusion of nonspherical particles presents an unsolved and considerable challenge, despite its importance for the understanding of crowding effects in biology and nanotechnology. A common approach is the mapping of nonspherical objects on effective spheres to subsequently approximate phenomena for nonspherical particles with the established predictions for spheres. Using hydrodynamic simulations, we show that this so-called effective sphere model fundamentally fails to represent the short-time self-diffusion of nonspherical particles even at low volume fractions and small to moderate nonsphericities. Based on analytical theory of hydrodynamic interactions, we discuss possible improvements for the modeling as well as the implications of our findings for studies employing effective spheres.