Dresden 2006 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 22: SYMPOSIUM Microfluidics II: Soft objects in flow, open geometries
CPP 22.3: Talk
Thursday, March 30, 2006, 14:45–15:00, ZEU 160
Electrophoretic mobility of DNA from Lattice Boltzmann simulations — •Sandeep Tyagi1 and Christian Holm1,2 — 1Frankfurt Institue for Advanced Studies, Max-von-Laue-strasse 1, D-60438 Frankfurt am Main, Germany — 2Max-Planck-Institut für Polymerforschung, Ackermannweg 10, D-55128 Mainz, Germany
We investigate the electrophoretic motion of DNA of various length under the influence of an applied DC electric field in the bulk and under confinement. The simulation method uses an implicit solvent model with an effective dielectric permittivity, but includes both long range hydrodynamic and full electrostatic interactions. The DNA is treated via a semi-flexible bead-spring model. The charged "beads" on the DNA and the associated free counterions are frictionally coupled to the solvent using a lattice Boltzmann solver due to Ahlrichs and Dünweg (J. Chem. Phys, Vol. 111, 1999). This efficient technique that scales linearly with the number of particles is demonstrated to produce experimentally known results for the dependence of the electrophoretic mobilities of DNA on the degree of polymerization. Chain conformations of DNA and the corresponding counterion distribution around the chains at various externally applied electric fields are probed. We also discuss the extension of this technique for studying electrophoretic motion of charged objects in slit-pore including dielectric boundaries.