Christian Holm

Group leader

Office:	1.218
Phone:	+49(0)69 / 798 - 47505
Fax:	+49(0)69 / 798 - 47611
Email:	holm _at_ fias.uni-frankfurt.de
Address:	Christian Holm Frankfurt Institute for Advanced Studies Johann-Wolfgang-Goethe-Universität Ruth-Moufang-Str. 1 60438 Frankfurt am Main Germany

Research

My scientific interests are especially the study of complex charged soft matter by means of computer simulations, and the development of simple theoretical models to describe them. More precisely I am currently working on the solution properties and association behavior of flexible and semi-flexible polyelectrolytes in various solvents and under various salt concentrations and salt types. In addition I am interested in the effective pair interactions of charged colloidal particles and their phase behavior. This includes simple DNA models, and DNA protein interactions, as well as developing coarse grained models for DNA-Histone complexes. I also began investigations of ferrofluids, where special attention is given to the structure of the solution and the magnetic response functions. Another interest is the applicability of mean-field models for the description of models with long range interactions, and possible improvements beyond the mean-field approach. This include local density functional methods based on the Poisson-Boltzmann functional, as well as strong coupling theories such as Wigner-crystal methods. In addition I am interested in the development of fast methods for the computation of long range interactions. These include pure Coulomb as well as dipolar interactions in various geometries (3D-1D), and under various boundary conditions.

Publications

2007

• Dmytro Antypov, Christian Holm.
  Osmotic Coefficient Calculations for Dilute Solutions of Short Stiff-Chain Polyelectrolytes.
  Macromolecules 40(3):731–738, 2007.
  [PDF] (182 KB) [DOI]
• Berk Hess, Mehmet Sayar, Christian Holm.
  Stability of Hydrophobically Modified Poly(p-phenylene)sulfonate Bundles as Observed by Molecular Dynamics Simulation.
  Macromolecules 40(5):1703-1707, 2007.
  [PDF] (239 KB) [DOI]
• Alexey O. Ivanov, Sofia S. Kantorovich, Evgeniy N. Reznikov, Christian Holm, Alexander F. Pshenichnikov, Alexander V. Lebedev, Alexandros Chremos, Philip J. Camp.
  Magnetic properties of polydisperse ferrofluids: A critical comparison between experiment, theory and computer simulation.
  Physical Review E 75(6):061405, 2007.
  [PDF] (339 KB) [DOI]
• M. Sayar, C. Holm.
  Finite Size Polyelectrolyte Bundles at Thermodynamic Equilibrium.
  Europhysics Letters 77:16001, 2007.
  [PDF] (328 KB) [Preprint] [DOI]
• Alexey O. Ivanov, Sofia S. Kantorovich, Evgeniy N. Reznikov, Christian Holm, Alexander F. Pshenichnikov, Alexander V. Lebedev, Alexandros Chremos, Philip J. Camp.
  Magnetic properties of polydisperse ferrofluids: A critical comparison between experiment, theory and computer simulation.
  Physical Review E 75(6):061405, 2007.
  [PDF] (339 KB) [DOI]

2006

• Christian Holm, Alexey Ivanov, Sofia Kantorovich, Elena Pyanzina, Evgeniy Reznikov.
  Equilibrium properties of a bidisperse ferrofluid with chain aggregates: theory and computer simulations.
  Journal of Physics: Condensed Matter 18(38):S2737–S2756, 2006.
  [PDF] (1.0 MB) [DOI]
• Christian Holm, Alexey Ivanov, Sofia Kantorovich, Elena Pyanzina.
  Polydispersity influence upon magnetic properties of aggregated ferrofluids.
  Zeitschrift für Physikalische Chemie 220:105–115, 2006.
  [PDF] (261 KB) [DOI]
• Dmytro Antypov, Christan Holm.
  Optimal cell approach to osmotic properties of finite stiff-chain polyelectrolytes.
  Physical Review Letters 96:088302, 2006.
  [PDF] (163 KB) [DOI]
• Axel Arnold, Bernward A. Mann, Christian Holm.
  Simulating Charged Systems with ESPResSo.
  In Computer Simulations in Condensed Matter: from Materials to Chemical Biology, pages 193–222. Edited by M. Ferrario, G. Ciccotti, K. Binder. Part of Lecture Notes in Physics.
  Springer, Berlin, Germany, 2006.
  [PDF] (1.3 MB) [DOI]
• Berk Hess, Christian Holm, Nico van der Vegt.
  Modeling multi-body effects in ionic solutions with a concentration dependent dielectric permittivity.
  Physical Review Letters 96:147801, 2006.
  [PDF] (115 KB) [DOI]
• Berk Hess, Christian Holm, Nico van der Vegt.
  Osmotic Coeffcients of atomistic NaCl (aq) force-fields.
  The Journal of Chemical Physics 124:164509, 2006.
  [PDF] (354 KB) [DOI]
• H. J. Limbach, A. Arnold, B. A. Mann, C. Holm.
  ESPResSo – An Extensible Simulation Package for Research on Soft Matter Systems.
  Computer Physics Communications 174(9):704–727, 2006.
  [PDF] (318 KB) [DOI]
• Bernward Mann, Christian Holm, Kurt Kremer.
  The Swelling Behaviour of Charged Hydrogels.
  Macromolecular Symposia 237:90–107, 2006.
  [PDF] (563 KB) [DOI]
• Frank Mühlbacher, Christian Holm, Helmut Schiessel.
  Controlled DNA compaction within chromatin: The tail-bridging effect.
  Europhysics Letters 73(1):135–141, 2006.
  [PDF] (273 KB) [DOI]
• Frank Mühlbacher, Helmut Schiessel, Christian Holm.
  Tail-induced attraction between nucleosome core particles.
  Physical Review E 74:031919, 2006.
  [PDF] (811 KB) [DOI]