发表机构
Indian Institute of Technology Madras（印度马德拉斯理工学院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过DPD模拟发现，伸展型活性促进聚合物平行排列并增强液滴运动持久性，收缩型活性导致垂直组织并维持近弹道运动，揭示了活性流体动力学对内部结构与运动性的调控机制。
AI 中文摘要
我们使用耗散粒子动力学（DPD）模拟研究了限制在悬浮于流体中的柔软可变形液滴内的半柔性活性聚合物。沿聚合物主链的伸展型和收缩型力偶极子产生不同的流体动力学流场，这些流场介导了聚合物链段之间的有效相互作用。伸展型活性促进平行排列和横向吸引，而收缩型活性则倾向于垂直组织，导致定性不同的集体行为。活性产生的流动与可变形界面强耦合，选择性地增强与长波长液滴变形相关的低阶球谐模式。活性还驱动界面弛豫偏离被动毛细行为，伸展型和收缩型液滴表现出不同的模式依赖动力学。内部组织和界面涨落的这些差异强烈影响液滴的运动性。伸展型活性随着聚合物数量的增加产生越来越持久的液滴运动，而收缩型活性可以维持长寿命的近弹道运动，其持续时间敏感地依赖于聚合物数量和活性强度。我们的结果证明了活性流体动力学如何控制受限活性物质系统中内部结构、界面涨落和涌现运动性之间的相互作用。
英文摘要
We study semiflexible active polymers confined within a soft, deformable droplet suspended in a fluid using dissipative particle dynamics (DPD) simulations. Extensile and contractile force dipoles along the polymer backbone generate distinct hydrodynamic flow fields that mediate effective interactions between polymer segments. Extensile activity promotes parallel alignment and lateral attraction, whereas contractile activity favors predominantly perpendicular organization, leading to qualitatively different collective behavior. The activity-generated flows couple strongly to the deformable interface, selectively enhancing low-order spherical-harmonic modes associated with long-wavelength droplet deformations. Activity also drives the interfacial relaxation away from passive capillary behavior, with extensile and contractile droplets exhibiting distinct mode-dependent dynamics. These differences in internal organization and interfacial fluctuations strongly influence droplet motility. Extensile activity produces increasingly persistent droplet motion with increasing polymer number, whereas contractile activity can sustain long-lived near-ballistic motion whose duration depends sensitively on polymer number and activity strength. Our results demonstrate how active hydrodynamics governs the interplay between internal structure, interfacial fluctuations, and emergent motility in confined active matter systems.
