Effect of polymer-wall interaction On the translocation of a polymer Through nano-channel

Abstract

In this thesis, we present the effect of attractive polymer-wall interaction on the translocation of a polymer chain moving through nanochannel in the absence of external force using dynamical Monte Carlo simulations. An attractive interaction is introduced only inside the channel. To overcome the entropic barrier, we consider a polymer which is initially placed in the middle of the channel and study the system parameters that affect the escape time τesc of the polymer chain to completely exit from the middle of the channel on either end. In our computational study, the effect of interaction strength is treated for both static and dynamic properties of a linear chain polymers translocating through a nanochannel. The examined result shows that the scaling relation of the mean squared end-to-end distance and the mean squared radius of gyration of a linear polymer chain length N varies with the interaction strength . Similarly the dynamical properties of a linear chain polymer in the absence and presence of polymer-wall interaction have studied. The simulation results shows that the peak values of the probability distribution decreases as the interaction strength increases. The effect of polymer-wall interaction on the scaling exponent of τ ∼ N α also studied for unbiased translocation, with respect τesc the escape time and N the polymer length. Results show that the exponent α is dependent on the polymer-wall interaction. And also in this simulation work, we investigate the escaping time τ esc of the polymer chain moving through nanochannel is strongly dependent on the interaction strength and the chain length N of a linear polymers