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Injection of a Self-propelled polymer into a Small Circular Cavity

Chinese Journal of polymer Science 2024年第6期42卷 886-894页

作者： Chao Wang Yan-Li Zhou Xiao Yang Fan Wu Meng-Bo Luo Department of Physics Taizhou UniversityTaizhou318000China Department of Physics Zhejiang UniversityHangzhou310027China

The injection of a polymer chain into a small circular cavity under tangential self-propelled force is studied by using Langevin dynamics simulation.Results indicate that the injection dynamics of the active polymer shows strong correlation with the polymer conformation inside the cavity depending on the polymer rigidity(k_(b)).The injection timeτvaries nonmonotonously with increasing k_(b),and reaches its minimum at k_(b)^(*).When k_(b) is small(k_(b)≪k_(b)^(*)),the polymer is nearly random coil in the cavity,and spends a long time at the final stage of the injection process due to the large repulsion between monomers inside the cavity.When k_(b) is moderate(k_(b)∼k_(b)^(*)),the part of polymer inside the cavity forms spiral configuration under the tangential active force,and the whole polymer moves synchronously with a constant velocity during the injection process,leading to a small injection time.When k_(b) is large(k_(b)≫k_(b)^(*)),the polymer is nearly straight at the initial stage of the injection process,and takes a long time to bend itself,leading to a large injection time.

关键词： active polymer Injection Dynamics Simulation

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Translocation of a Self-propelled polymer through a Narrow Pore

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Chinese Journal of polymer Science 2022年第12期40卷 1670-1678,I0010页

作者： Chao Wang Han-Xian Hu Yan-Li Zhou Bin Zhao Meng-Bo Luo Department of Physics Taizhou UniversityTaizhou 318000China Department of Physics Zhejiang UniversityHangzhou 310027China

Recent studies indicate that active polymers often show curious conformational and dynamical properties.Specially,rigid polymers with self-propelled tangential forces can move directionally and even push a cargo.Motivated by this,the tran slocation of an active bead-spring polymer through a narrow pore is studied simulationly in this work.Each bead of the polymer is propelled by a tangential active force(f) along the contour of the polymer.Simulation results show that the active polymer translocates through the pore in a railway-motion manner.The tran slocation velocity v of the polymer is determined only by f,resulting that the translocation time(r) as a function of the polymer length(N)and the active force fcan be expressed as τ∝ Nf,which is independent of the rigidity of the polymer.Our results indicate that the tran slocation dynamics of active polymers is quite different from that of passive polymers.

关键词： active polymer Translocation Dynamics Simulation

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