Physics

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A Monte Carlo Study on a 3-Dimensional Comb Polymer Translocation Through a Nanopore Driven by an Electric Field
(Addis Ababa University, 2024-01) Bruh Tesfa; Tatek Yergou
A lattice Monte Carlo study of comb polymers translocation through a nanopore subject to an electric field is presented. Our approach is universal in a sense that we are not limited to single file translocations. Instead, we investigated single file translocations as a particular case in this universal approach. In this way, we have made an extensive study on the translocation dynamics of comb polymers as a function of field strength, pore size, and the comb polymer’s topology. We were able to show the existence of a critical field strength for any particular system. The difference between the most probable translocation time and the mean translocation time is minimum at the critical field strength. Also, the critical field strength helped us to identify two regimes of translocations with different properties. We named them as smooth and chaotic translocations. These results should also be valid for linear polymers because linear polymers are comb polymers without side chains. In addition, we took advantage of the side chains of comb polymers to study the pore-polymer interaction in an unprecedented way by varying the side chain lengths. This enabled us explain the varied values of _ in h_ i _ N_, where h_ i is the mean translocation time and N is the chain length of a linear polymer, in the literature.