Volume 104, Number 6, December 2013
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||14 January 2014|
Expansion dynamics of a self-avoiding polymer in a cylindrical pore
1 National Institute of Supercomputing and Networking, Korea Institute of Science and Technology Information Daejeon 305-806, Korea
2 Department of Physics and Astronomy, University of Waterloo - Waterloo, Ontario, Canada N2L 3G1
3 Department of Physics Education, Chosun University - Gwangju 501-759, Korea
Received: 7 October 2013
Accepted: 10 December 2013
Inspired by recent bacterial chromosome experiments in narrow channels, we simulate the expansion (and internal) dynamics of a self-avoiding polymer under cylindrical confinement. The chain is trapped in a piston, compressed up to of its equilibrium length, and released unidirectionally from the right end of the piston. Our results suggest that the chain initially expands like a concentrated hard-sphere system, enters a subdiffusive regime at an intermediate time, and eventually relaxes globally to its equilibrium size. Using our results, we test a few theoretical models (e.g., a Flory-type approach), in which the blob-blob or monomer-monomer interaction determines “expansion forces,” clarifying their applicability. Our results can be used for exploring further the polymer aspect of bacterial chromosomes.
PACS: 87.16.A- – Theory, modeling, and simulations / 87.15.H- – Dynamics of biomolecules
© EPLA, 2013
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