Stefan Kesselheim

Stefan Kesselheim
PhD student

Office:	1.041
Fax:	+49 711 685-63658
Email:	Stefan.Kesselheim _at_ icp.uni-stuttgart.de
Address:	Stefan Kesselheim Institute for Computational Physics Universität Stuttgart Allmandring 3 70569 Stuttgart Germany

Research

Here is a little overview over my research topics. The common theme of these topics is the behaviour of charged systems under out-of-equilibrium conditions.

DNA tranlocation through nanopores

My main research topic is DNA translocation through nanopores. A detailed description of the project can be found here.

Ionic liquid based super capacitors

We work on a better understanding the behaviour on ionic liquids at interfaces, especially under a high applied voltage. My main contribution is an algorithm to take the electrode conductivity (e.g. of graphene) into account in molecular dynamics simulations.

Growth of colloidal crystals

We investigate the growth of colloidal crystal with molecular dynamics simulations. By coupling the particle dynamics with the Lattice Boltzmann Method, we could, for the first time, show that hydrodynamic interactions slow down the growth of colloidal crystals. A manuscript regarding this finding is submitted to Soft Matter.

Solution of the Poisson-Boltzmann Equation

We have developed a novel scheme to solve the Poisson Boltzmann equation with the finite element method including arbitrarily shaped objects with varying dielectric permittivity. In this method, the boundary conditions are determined iteratively. The methods allows for potential dependent surface charges (=charge regulation) and open boundaries.

Publications

• Stefan Kesselheim, Wojciech Müller, Christian Holm.
  Origin of Current Blockades in Nanopore Translocation Experiments.
  Physical Review Letters 112(1):018101, 2014.
  [PDF] (351 KB) [DOI]
• Thomas Ertl, Michael Krone, Stefan Kesselheim, Katrin Scharnowski, Guido Reina, Christian Holm.
  Visual Analysis for Space-Time Aggregation of Biomolecular Simulations.
  Faraday Discussions 169(0):167–178, 2014.
  [PDF] (2.7 MB) [DOI]
• Stefan Kesselheim, Christian Holm.
  Modeling DNA in Nanopores.
  In Electrostatics of Soft and Disordered Media, pages 315–334. Edited by R. David Dean, Jure Dobnikar, Ali Naji, Rudolf Podgornik.
  Pan Stanford Publishing, 2014.
  [DOI]
• Axel Arnold, Olaf Lenz, Stefan Kesselheim, Rudolf Weeber, Florian Fahrenberger, Dominic Röhm, Peter Košovan, Christian Holm.
  ESPResSo 3.1 – Molecular Dynamics Software for Coarse-Grained Models.
  In Meshfree Methods for Partial Differential Equations VI, pages 1–23. Edited by Michael Griebel, Marc Alexander Schweitzer. Part of Lecture Notes in Computational Science and Engineering, volume 89.
  Springer Berlin Heidelberg, 2013.
  [PDF] (380 KB) [DOI]
• Stefan Kesselheim, Marcello Sega, Christian Holm.
  Applying ICC$^{\star}$ to DNA translocation. Effect of dielectric boundaries.
  Computer Physics Communications 182(1):33–35, 2011.
  [PDF] (197 KB) [DOI]