报告
纳米孔
聚合物
化学物理
材料科学
单体
分子质量
半径
分子动力学
热力学
化学
物理
纳米技术
计算化学
核磁共振
复合材料
酶
计算机安全
计算机科学
作者
Abdelghani Oukhaled,Anne‐Laure Biance,Juan Pelta,L. Auvray,Laurent Bacri
标识
DOI:10.1103/physrevlett.108.088104
摘要
We investigate the entrance of single poly(ethylene glycol) chains into an α-hemolysin channel. We detect the frequency and duration of the current blockades induced by large neutral polymers, where chain radius is larger than pore diameter. In the semidilute regime, these chains pass only if the monomer concentration is larger than a well-defined threshold. Experiments are performed in a very large domain of concentration and molecular mass, up to 35% and 200 kDa, respectively, which was previously unexplored. The variation of the dwell time as a function of molecular mass shows that the chains are extracted from the semidilute solution in contact with the pore by a reptation mechanism.
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