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  • Title: Compression and stretching of a self-avoiding chain in cylindrical nanopores.
    Author: Jun S, Thirumalai D, Ha BY.
    Journal: Phys Rev Lett; 2008 Sep 26; 101(13):138101. PubMed ID: 18851496.
    Abstract:
    Force-induced deformations of a self-avoiding chain confined inside a cylindrical cavity, with diameter D, are probed using molecular dynamics simulations, scaling analysis, and analytical calculations. We obtain and confirm a simple scaling relation -fD approximately R(-9/4) in the strong-compression regime, while for weak deformations, we find fD = -A(R/R0) + B(R/R0)(-2), where A and B are constants, f the external force, and R the chain extension (with R0 its unperturbed value). For a strong stretch, we present a universal, analytical force-extension relation. Our results can be used to analyze the behavior of biomolecules in confinement.
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