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

• Kesselheim, Stefan and Müller, Wojciech and Holm, Christian.
  "Origin of Current Blockades in Nanopore Translocation Experiments".
  Physical Review Letters 112(018101), 2014.
  [PDF] (351 KB) [DOI] [URL]
• Ertl, Thomas and Krone, Michael and Kesselheim, Stefan and Scharnowski, Katrin and Reina, Guido and Holm, Christian.
  "Visual Analysis for Space-Time Aggregation of Biomolecular Simulations".
  Faraday Discussions 169(167–178), 2014.
  [PDF] (3 MB) [DOI]
• Stefan Kesselheim and Christian Holm.
  "Modeling DNA in Nanopores".
  In Electrostatics of Soft and Disordered Media, pages 315–334. Editors: R. David Dean and Jure Dobnikar and Ali Naji and Rudolf Podgornik,
  Pan Stanford Publishing, 2014.
  [DOI]
• Axel Arnold and Olaf Lenz and Stefan Kesselheim and Rudolf Weeber and Florian Fahrenberger and Dominic Röhm and Peter Košovan and Christian Holm.
  "ESPResSo 3.1 – Molecular Dynamics Software for Coarse-Grained Models".
  In Meshfree Methods for Partial Differential Equations VI, volume 89 of Lecture Notes in Computational Science and Engineering, pages 1–23. Editors: M. Griebel and M. A. Schweitzer,
  Springer Berlin Heidelberg, 2013.
  [PDF] (380 KB) [DOI] [URL]
• Stefan Kesselheim and Marcello Sega and Christian Holm.
  "Applying ICC* to DNA translocation. Effect of dielectric boundaries".
  Computer Physics Communications 182(1)(33–35), 2011.
  [PDF] (197 KB)