Propulsion and Interaction of Hot Brownian Swimmers

热布朗游泳者的推进和相互作用

• 批准号: 254960539
• 负责人: Professor Dr. Frank Cichos
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/254960539?language=en
• 关键词: Propulsion; Interaction; Hot; Brownian; Swimmers

Self-thermophoretic (hot) microswimmers are versatile and prototypical active particles driven by thermo-osmotic flows excited by heating at the particle surface and nearby substrates. Their interesting nonequilibrium Brownian fluctuations are theoretically and experimentally well under control. Our highly optimised parallel numerical code for supporting nonequilibrium molecular dynamics simulations establishes an independent platform to link experiment and theory. Based on the results of the preceding funding period, we will concert experiments, simulations, and theory to further elucidate the mutual interactions of swimmers and interactions with substrate surfaces. We will continue to employ the innovative technique of photon nudging for a force-free and torque-free manipulation and steering of hot swimmers, and extend it to allow for controlled measurements of the swim pressure and surface tension of flocks of hot swimmers experimentally. Theoretically, we will extend our recent progress in the systematic coarse-graining of interacting assemblies of so-called active-Brownian-particles (ABP), for which we could unambiguously derive formal expressions for the so-called swim pressure and the surface tension. We will extend this analysis to a (wet) microscopic model with momentum conservation, representing swimming by a velocity rather than by the classical (dry) ABP swim force. Eventually, we aim at an inclusion of the swimmer-specific interactions revealed by our simulations and experiments. In a more applied direction, it will be interesting to extend or supersede the physical interactions between our hot swimmers by specifically tailored artificial interactions. We plan to implement a feedback control via photon nudging as a mechanism for swimmers to mutually interact via an exchange of (delayed) information. These will be suitable to mimic the effect of information-triggered flocking in living systems. In the long run, this should turn our model system of hot swimmers into a versatile experimental laboratory to emulate generic active matter systems.

自我热（热）微晶状体是通过热渗透流的多功能和典型的活性颗粒，该颗粒是由热渗透流动驱动的，这是通过在粒子表面和底物附近加热而激发的。他们有趣的非平衡性棕色波动是理论上的，并且在实验上可以很好地控制。我们高度优化的平行数值代码，用于支持非平衡分子动力学模拟建立了一个独立的平台来链接实验和理论。根据上述资金期的结果，我们将进行协调实验，模拟和理论，以进一步阐明游泳者与底物表面相互作用的相互作用。我们将继续采用光子练习的创新技术，用于无力和无扭矩的操纵和热游泳者的转向，并将其扩展以对经过实验的热游泳者的游泳压力和表面张力进行控制。理论上，我们将扩展我们最近在所谓的活跃棕色粒子（ABP）的相互作用组件的系统粗粒度上进行的进展，为此，我们可以明确地为所谓的游泳压力和表面张力得出形式的表达。我们将将此分析扩展到具有动量保护的（湿）微观模型，代表以速度而不是经典（干）ABP游泳力量游泳。最终，我们的目标是包括我们的模拟和实验所揭示的游泳者特定相互作用。在更应用的方向上，它有兴趣通过专门定制的人工相互作用来扩展或取代热游泳者之间的物理相互作用。我们计划通过光子纽约实施反馈控制，以作为游泳者通过（延迟）信息交换相互作用的机制。这些将适合模仿生活系统中信息触发的羊群的影响。从长远来看，这应该将我们的热游泳者模型系统变成一个多功能的实验实验室，以模仿通用的活动物质系统。