论文标题

活性介导的小球,以线圈在较差的溶剂中的柔性聚合物过渡

Activity Mediated Globule to Coil Transition of a Flexible Polymer in Poor Solvent

论文作者

Paul, Subhajit, Majumder, Suman, Janke, Wolfhard

论文摘要

了解自我推测在活性丝对象的构象特性中的作用与生物学相关。在这种情况下,我们考虑了一种灵活的珠子弹力模型聚合物,并在非键键单体之间进行了吸引力和排斥性的相互作用,每个珠子的活性都沿其内在的自我推测方向起作用。我们在从良好的溶剂状态下淬灭后,我们以过度阻尼的极限研究其动力学。我们观察到,尽管动作途径仍然相似,但由于动作途径仍然相似,因此比球形成时间的缩放指数比被动情况小。有趣的是,对于高度活动,当自我推测在相互作用的能量上占主导地位时,聚合物变得更加扩展。在其稳定状态下,通过其回旋半径测量的聚合物的空间延伸的变化显示了两个完全不同的缩放制度:相应的弗洛里指数从$ 1/3 $变为$ 3/5 $,类似于从球状状态到自避免行走的聚合物的过渡。这可以通过系统中存在的三个能量尺度的相互作用来解释,即“弹道”,热和相互作用能量。

Understanding the role of self-propulsion on the conformational properties of active filamentous objects has relevance in biology. In this context, we consider a flexible bead-spring model polymer for which along with both attractive and repulsive interactions among the non-bonded monomers, activity for each bead works along its intrinsic direction of self-propulsion. We study its kinetics in the overdamped limit, following a quench from good to poor solvent condition. We observe that with low activities, though the kinetic pathways remain similar, the scaling exponent for the relaxation time of globule formation becomes smaller than that for the passive case. Interestingly, for higher activities when self-propulsion dominates over interaction energy, the polymer becomes more extended. In its steady state, the variation of the spatial extension of the polymer, measured via its gyration radius, shows two completely different scaling regimes: The corresponding Flory exponent changes from $1/3$ to $3/5$ similar to a transition of the polymer from a globular state to a self-avoiding walk. This can be explained by an interplay among three energy scales present in the system, viz., the "ballistic", thermal, and interaction energy.

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