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Soft Matter and Biological Physics

Eur. Phys. J. E 7, 65-71 (2002)
DOI: 10.1140/epje/i200101124

Drift of a polymer chain in a porous medium -A Monte Carlo study

K. Avramova and A. Milchev

Institute for Physical Chemistry, Bulgarian Academy of Sciences, G. Bonchev Str., Block 11, 1113 Sofia, Bulgaria


(Received 20 August 2001 and Received in final form 19 November 2001)

We investigate the drift of an end-labeled telehelic polymer chain in a frozen disordered medium under the action of a constant force applied to the one end of the macromolecule by means of an off-lattice bead spring Monte Carlo model. The length of the polymers N is varied in the range 8<N<128, and the obstacle concentration in the medium C is varied from zero up to the percolation threshold $C\approx 0.75$. For field intensities below a C-dependent critical field strength $B_\ab{c}$, where jamming effects become dominant, we find that the conformational properties of the drifting chains can be interpreted as described by a scaling theory based on Pincus blobs. The variation of drag velocity with C in this interval of field intensities is qualitatively described by the law of Mackie-Meares. The threshold field intensity $B_\ab{c}$ itself is found to decrease linearly with C.

36.20.-r - Macromolecules and polymer molecules.
36.20.Ey - Conformation (statistics and dynamics).
82.45.-h - Electrochemistry and electrophoresis.

© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2002