2007/10/31 by Henk Vocks, Debabrata Panja, Gerard T. Barkema +3 · 4 citations
Biochemistry, Genetics and Molecular Biology · Engineering · Materials Science · Physics and Astronomy · #Fuel Cells and Related Materials #Nanopore and Nanochannel Transport Studies #Thermal properties of materials #cond-mat.soft #cond-mat.stat-mech #physics.bio-ph #q-bio.BM
paper · pdf · doi:10.1088/0953-8984/20/9/095224
published as J. Phys.: Condens. Matter 20, 095224 (2008) · 14 pages, 6 figures, slightly shorter than the previous version; to appear in J. Phys.: Cond. Mat
arxiv created 2008/02/05 · openalex publication_date 2008/02/14 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We study pore-blockade times for a translocating polymer of length N , driven by a field E across the pore in three dimensions. The polymer performs Rouse dynamics, i.e., we consider polymer dynamics in the absence of hydrodynamical interactions. We find that the typical time for which the pore remains blocked during a translocation event scales as ∼ N (1+2ν)/(1+ν) / E , where is the Flory exponent for the polymer. We show, in line with our previous work, that this scaling behavior stems from polymer dynamics in the immediate vicinity of the pore—in particular, the memory effects in the polymer chain tension imbalance across the pore. This result, like numerical results from several other groups, violates the lower bound ∼ N 1+ν / E suggested earlier in the literature. We discuss why this lower bound is incorrect and show, on the basis of the conservation of energy, that the correct lower bound for the pore-blockade time for field-driven translocation is given by η N 2ν / E , where η is the viscosity of the medium surrounding the polymer.