Chem. J. Chinese Universities ›› 2018, Vol. 39 ›› Issue (5): 1009.doi: 10.7503/cjcu20170556

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Simulation Study on the Migration of Polymer in Periodic Channels Under Weak Driving Force

ZHOU Yanli, CHEN Yingcai, WANG Chao*   

  1. Department of Physics, Taizhou University, Taizhou 318000, China
  • Received:2017-08-14 Online:2018-04-03 Published:2018-04-03
  • Contact: WANG Chao
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.11604232) and the Natural Science Foundation of Zhejiang Province, China(Nos.LQ14A040006, LY16A040004).

Abstract:

The migration of polymer in periodical channels under weak electrical driving force was studied by Langevin dynamics simulation. The channel was patterned alternately by part α and part β with the same length. The interaction between polymer and channel α was attractive, while that between polymer and channel β was purely repulsive. The results show that there are obvious trapped stages during the migration of polymer in periodical channels. The manner for polymer escaping from the trapped stage is dependent on the channel width. For narrow channel case, polymer keeps linear configuration and the movement seems like snake motion during the migration. The escape of polymer from the trapped stage needs the participation of the whole polymer, resulting that the mobility changes periodically with polymer length. At positions of the extreme point of the mobility, there are simple relations between the projected length of polymer and the period of the channel. For wide channel case, polymer keeps hair-pin or coil configuration and the movement seems like worm motion during the migration. Specially, when polymer is long, polymer can escape from the trapped stage by elongating the head part of the polymer, leading to the independent of the mobility on polymer length. The results may be helpful for polymer separation and controlled movement by using periodic channels.

Key words: Polymer, Migration, Periodical channel, Langevin dynamics simulation

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