de Haan Hendrick W, Slater Gary W
Physics Department, University of Ottawa, Ottawa, Ontario, Canada.
Phys Rev E Stat Nonlin Soft Matter Phys. 2010 May;81(5 Pt 1):051802. doi: 10.1103/PhysRevE.81.051802. Epub 2010 May 14.
The unbiased translocation of a coarse-grained polymer through a nanopore is investigated via Langevin dynamics simulations for polymers ranging from N=19 to 299 monomers in length and pore widths r p ranging from 1 to 10 times the monomer diameter. The exponent α derived from the scaling of the translocation time τ with respect to the molecular weight N is found to be heavily dependent on r p and increases from a value of 2.2 for r p=1.0 up to a saturation value of 3. The details of the translocation process also reveal that the average number of monomers in the pore [n p] not only varies as translocation proceeds but that for any polymer where the radius of gyration is greater than the radius of the available pore width, [n p] decreases with increasing N. Using these data to rescale the results according to a blob picture, the results retain sensitivity on the pore geometry as α varies from 2.2 to 2.65--a range which covers all results reported in previous studies.
通过朗之万动力学模拟，研究了长度从N = 19到299个单体、孔宽度r p从单体直径的1倍到10倍的粗粒聚合物通过纳米孔的无偏转运。发现从转运时间τ相对于分子量N的标度得出的指数α强烈依赖于r p，并且从r p = 1.0时的2.2值增加到饱和值3。转运过程的细节还表明，孔中单体的平均数量[n p]不仅随着转运的进行而变化，而且对于任何回转半径大于可用孔宽度半径的聚合物，[n p]随着N的增加而减少。根据“链段”图像使用这些数据重新缩放结果，结果在α从2.2变化到2.65时仍对孔几何形状敏感——该范围涵盖了先前研究中报道的所有结果。
