Conformation and drift of a telechelic chain in porous media

    Authors

    A. Bhattacharya

    Comments

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    Abbreviated Journal Title

    J. Phys.-Condes. Matter

    Keywords

    POLYMER-CHAIN; MOLECULAR-DYNAMICS; MONTE-CARLO; SIMULATION; DIFFUSION; FLOW; Physics, Condensed Matter

    Abstract

    The conformation and drift properties of a telechelic chain moving through a porous host of randomly distributed static obstacles are studied using Brownian dynamics simulation for a Grest-Kremer bead-spring model of polymer. Static chain conformations exhibit non-monotonic behaviour as a function of the impurity density p(imp) at zero bias. The chain initially shrinks due to an entropic barrier as the density of the obstacles pimp is increased. In the presence of the obstacles it requires only a tiny bias for a long chain to be mostly stretched. We then study the drift property of the chain as a function of the bias and impurity density. The drift velocity of the chain saturates beyond a threshold bias F-crit(x). This observation can be useful in designing DNA sequencing methods based on electrophorefic mobility.

    Journal Title

    Journal of Physics-Condensed Matter

    Volume

    16

    Issue/Number

    44

    Publication Date

    1-1-2004

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    S5203

    Last Page

    S5211

    WOS Identifier

    WOS:000225708800018

    ISSN

    0953-8984

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