Publication Date:
2015-12-19
Description:
The forced translocation of homopolymers through αβα sandwich-like compound channels was investigated by Monte Carlo simulation. The interaction between polymer and part α is strongly attractive, whereas that between polymer and part β is purely repulsive. Simulation results show that the translocation is influenced obviously by the length of part β ( L β ) and the starting position of part β ( L α1 ). For small L β , the translocation is mainly governed by the escaping process, and polymer is trapped near the exit of the channel. However, the translocation time can be tuned by varying L α1 and the fastest translocation can be achieved at relatively large L α1 . Whereas for large L β and small L α1 , the translocation is mainly controlled by the filling process. It is difficult for polymer to enter the channel, and polymer is trapped at the first αβ interface. Finally, the dynamics for the filling process and the escaping process are discussed from the view of free-energy landscape, respectively.
Electronic ISSN:
1931-9223
Topics:
Chemistry and Pharmacology
,
Physics
