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Abstract: We report extensive simulations of the relaxation dynamics of a self-avoidingpolymer confined inside a cylindrical pore. In particular, we concentrate onexamining how confinement influences the scaling behavior of the globalrelaxation time of the chain, t, with the chain length N and pore diameter D.An earlier scaling analysis based on the de Gennes blob picture led to t ~N^2D^1-3. Our numerical effort that combines molecular dynamics and MonteCarlo simulations, however, consistently produces different t-results for N upto 2000. We argue that the previous scaling prediction is only asymptoticallyvalid in the limit N >> D^5-3 >> 1, which is currently inaccessible tocomputer simulations and, more interestingly, is also difficult to reach inexperiments. Our results are thus relevant for the interpretation of recentexperiments with DNA in nano- and micro-channels.



Author: A. Arnold, B. Bozorgui, D. Frenkel, B.-Y. Ha, S. Jun

Source: https://arxiv.org/



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