Effects of an attractive wall on the translocation of polymer under driving.
The effects of an attractive wall at the trans side on the translocation of an eight-site bond-fluctuation model (BFM) polymer through a pore in a membrane under driving are simulated by the dynamic Monte Carlo method. The attractive wall shows two contrary effects: its excluded volume effect reduces configuration entropy and thus hinders the translocation of the polymer, while its attraction decreases the energy and thus accelerates the translocation. At a critical polymer-wall interaction ε* ≈- 1, we find that the two effects compensate each other and the translocation time τ is roughly independent of the separation distance between the wall and the pore. The value ε* ≈- 1 is roughly equal to the critical adsorption point for the BFM polymer. Moreover, the value of the critical attraction is roughly independent of chain length N and chemical potential difference Δμ. At last, a scaling relation τ ∼ N(α) is observed for polymer translocation at a high value of NΔμ. Though the translocation time is highly dependent on the polymer-wall interaction and pore-wall separation distance, the exponent α is always about 1.30 ± 0.05 so long as NΔμ is large enough.
Department of Physics, Zhejiang University, Hangzhou 310027, People's Republic of China.
Wei-Ping
WP
Cao
Chao
C
Wang
Li-Zhen
LZ
Sun
Meng-Bo
MB
Luo
D000327:Adsorption; D002462:Cell Membrane / Q000378:metabolism; D007700:Kinetics; D055595:Mechanical Phenomena; D009010:Monte Carlo Method; D009038:Motion; D009068:Movement; D011108:Polymers / Q000737:chemistry* / Q000378:metabolism; D016062:Porosity
D011108:Polymers