Field driven polymer translocation through Nanochannel

Abstract

In this research, we used MC simulations in 2D to investigate the field driven polymer translocation through nanochannel with Bond Fluctuation Method. Thus we study the static properties of a polymer chain by calculating the mean-squared end-to-end distance hR2i and the average-squared radius of gyration Rg 2 of a polymer. Additionally, the scaling behavior of radius of gyration and end-to-end distance of field driven linear polymer, with their respective chain length N was investigated. And we got the scaling 1.4419, 1.9002, 1.9401, 1.9424, 1.9320, 1.8031 and 1.7116 for < R2 > and 1.4902, 1.9824, 2.0306, 2.0227, 2.0045, 1.8918 and 1.8177 for for < Rg2 > for the forces 0.0, 0.2, 0.4, 0.5, 0.6, 0.8 and 1.0 respectively. Moreover, we investigated the probability distribution of the escape time of polymers in the presence of external field and the most probabilistic times were calculated from probability distributions. Then, the influences of external force F and the chain length N on the escape time were studied and their scaling behavior were observed. i.e., as the chain length increased, the scaling exponent was decreased; unlike as the force increased, the scaling exponent was decreased. Finally, the effect of the channel size on the translocation time of the polymer were investigated. Then, for both constant F and N, our result indicates that translocation times increase rapidly with increasing chain length in a nonlinear way for short polymers.