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.

我们研究了活性物质在细管中抵抗重力上升的能力以及其他相关现象，如垂直板的润湿和自发吸胀，其中润湿液体被吸入多孔介质。这种毛细作用或毛细现象在经典流体中是众所周知的，并且源自液体分子与容器壁之间的吸引相互作用，以及源自液体分子彼此之间的吸引。最近，我们观察到毛细作用的标量活性物质与纯粹的排斥相互作用的最小模型，其中出现了有效的吸引力，由于活性粒子之间的碰撞和活性粒子和墙壁之间的减速。基于这一观察结果，我们将回答三个问题，在这个项目中：如何强大的毛细上升预测的活性晶格气模型相对于所考虑的活性物质系统的微观细节？当不存在有吸引力的粒子与壁相互作用时，活性物质系统中毛细上升背后的机制是什么？静止粒子流在多大程度上对此负责？是否有实验实现了活性物质的毛细上升，例如通过使用活性胶体和里昂小组的实验装置，我们与他们合作，如果是的，潜在的机制是什么。