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Fluctuation-induced interactions in colloidal suspensions

胶体悬浮液中波动引起的相互作用

基本信息

批准号：
269422592
负责人：
Professor Dr. Alfred Hucht
金额：
--
依托单位：
Forschungsgruppe Theoretische Physik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/269422592?language=en
关键词：
Fluctuation induced interactions colloidal suspensions

项目摘要

Based on previous and current work in our group, in this project we want to develop a simulation method for many-particle systems interacting through fluctuation-induced critical Casimir forces. In contrast to previous theoretical work, the critical Casimir forces are modeled quasi "ab initio", as the fluctuating medium inducing these forces is exactly taken into account using appropriate statistical methods. Hence the origin of the fluctuation-induced forces is included in the method without any approximations. The cluster Monte Carlo algorithm developed in a current master thesis shall be used to model colloidal suspensions within critical binary liquid mixtures, which show a great variety of effects in experiments. Especially we want to study the influence of the particles on the critical medium and how the phase transition in the medium is modified.Fluctuation-induced interactions such as critical Casimir forces are generally non-additive and therefore can only approximately be described as sum of two-body interactions. Using the proposed method we want to analyze the accuracy of this approximation and the importance of higher order contributions such as three-body terms.At the beginning of the project the cluster Monte Carlo algorithm shall be enhanced in several ways (e.g. extension to three space dimensions, inclusion of varying surface couplings). Then the critical behavior of both the particle system and the fluctuating medium shall be characterized. Furthermore, many-particle effects shall be investigated resulting from the non-additivity of the fluctuation-induced forces which are important near the critical point of the medium. Finally the studies shall be extended to polydisperse systems and to Janus particles, where a rich behavior is expected.

基于我们小组以前和现在的工作，在这个项目中，我们想开发一种模拟方法，通过波动诱导的临界Casimir力的多粒子系统相互作用。与以前的理论工作相比，临界Casimir力是准“从头算”建模的，因为诱导这些力的波动介质是完全考虑使用适当的统计方法。因此，波动引起的力的起源包括在该方法中，而没有任何近似。在当前的硕士论文中开发的簇蒙特卡罗算法应被用来模拟临界二元液体混合物中的胶体悬浮液，这在实验中表现出各种各样的效果。特别是我们想研究粒子对临界介质的影响以及介质中的相变是如何被修改的。涨落引起的相互作用，如临界Casimir力，通常是不可加的，因此只能近似地描述为两体相互作用的总和。使用所提出的方法，我们要分析这种近似的准确性和更高的阶贡献的重要性，如三体terms.At项目的开始，集群蒙特卡罗算法应增强在几个方面（例如，扩展到三维空间，包括不同的表面耦合）。然后，颗粒系统和波动介质的临界行为应被表征。此外，还应研究由波动诱导力的非加性引起的多粒子效应，这在介质临界点附近很重要。最后，研究将扩展到多分散系统和Janus颗粒，其中预期有丰富的行为。