Capillary rise of active matter

活性物质的毛细管上升

• 批准号: 518780764
• 负责人: Professor Dr. Heiko Rieger
• 金额: --
• 依托单位: Bereich Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/518780764?language=en
• 关键词: Capillary; rise; active; matter

We study the capacity of active matter to rise in thin tubes against gravity and other related phenomena like wetting of vertical plates and spontaneous imbibition, where a wetting liquid is drawn into a porous medium. This capillary action or capillarity is well known in classical fluids and originates from attractive interactions between the liquid molecules and the container walls, and from the attraction of the liquid molecules among each other. Recently, we observed capillarity in a minimal model for scalar active matter with purely repulsive interactions, where an effective attraction emerges due to slowdown during collisions between active particles and between active particles and walls. Based on this observation we will answer three questions in this project: How robust is the capillary rise predicted by an active lattice gas model with respect to microscopic details of the considered active matter system? What is the mechanism behind the capillary rise in active matter system when attractive particle-wall interactions are absent and in how far are stationary particle currents responsible for it? Are there experimental realizations of the precited capillary rise of active matter, for instance by using active colloids and the experimental setup of the Lyon group, with whom we collaborate, and if yes, what are the underlying mechanisms.

我们研究了活跃物质在针对重力和其他相关现象（例如垂直板的润湿和自发吸收）中的薄管中升高的能力，其中将润湿液吸入多孔培养基中。这种毛细作用或毛细血管在经典流体中众所周知，起源于液体分子与容器壁之间的有吸引力的相互作用，以及彼此之间液体分子的吸引力。最近，我们在标量活动物质的最小模型中观察到毛细血管性，并纯粹是反相互作用的，在活动粒子之间以及活动粒子和壁之间的碰撞过程中，出现了有效的吸引力。基于此观察结果，我们将回答该项目中的三个问题：主动晶格气模型在被考虑的有效物质系统的微观细节方面预测的毛细管上升如何？当缺乏有吸引力的颗粒壁相互作用以及固定粒子电流导致它的固定颗粒壁相互作用时，毛细血管升高的机制是什么？是否有实验性实现活动物质的毛细血管升高，例如使用活跃的胶体和与我们合作的里昂组的实验设置，如果是的，则基本机制是什么。