Extended Fluctuation-Dissipation Theorem for Driven Colloidal Suspensions

驱动胶体悬浮液的扩展涨落耗散定理

• 批准号: 60433802
• 负责人: Professor Dr. Udo Seifert
• 金额: --
• 依托单位: II. Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/60433802?language=en
• 关键词: Extended; Fluctuation; Dissipation; Theorem; Driven

The fluctuation-dissipation theorem is both of great practical importance for the calculation of transport properties from computer simulations in a wide range of applications as well as of fundamental theoretical interest. So far these calculations have been mainly restricted to equilibrium. During the first funding period we have shown how to extend the fluctuation-dissipation theorem to non-equilibrium steady states involving only measurable quantities. Based on this result we will study a model colloidal suspension driven into non-equilibrium by simple shear flow. We will test to which extent a simple description in terms of an „effective temperature“ is feasible. The influence of flow-induced hydrodynamic interactions between particles on these new fluctuation-dissipation relations will be determined. As a concrete application we will prepare a special state which is only possible in non-equilibrium – a shear-melted suspension – and study the interplay of single-particle diffusion and mobility through our generalized fluctuation-dissipation theorem.

涨落耗散定理对于从计算机模拟中计算输运性质在广泛的应用中具有重要的实际意义，并且具有基本的理论意义。到目前为止，这些计算主要限于平衡。在第一个资助期间，我们展示了如何将波动耗散定理扩展到仅涉及可测量量的非平衡稳态。在此基础上，我们将研究一个由简单剪切流驱动进入非平衡态的模型胶体悬浮体。我们将检验用“有效温度”进行简单描述的可行性。将确定这些新的波动耗散关系的流动引起的颗粒之间的流体动力相互作用的影响。作为一个具体的应用，我们将准备一个特殊的状态，这是唯一可能在非平衡-剪切熔化悬浮液-和研究的相互作用，单粒子扩散和流动性，通过我们的广义波动耗散定理。

项目成果

Driven Brownian particle as a paradigm for a nonequilibrium heat bath: Effective temperature and cyclic work extraction.

驱动布朗粒子作为非平衡热浴的范例：有效温度和循环功提取

• DOI: 10.1103/physreve.95.050103
• 发表时间: 2017
• 期刊: Physical review. E
• 作者: R. Wulfert;M. Oechsle;T. Speck;U. Seifert
• 通讯作者: U. Seifert

Discontinuous thinning in active microrheology of soft complex matter.

• DOI: 10.1103/physreve.94.062610
• 发表时间: 2016-02
• 期刊: Physical review. E
• 作者: R. Wulfert;U. Seifert;T. Speck

Nonequilibrium depletion interactions in active microrheology.

活跃微流变学中的非平衡耗尽相互作用

• DOI: 10.1039/c7sm01737e
• 发表时间: 2017
• 期刊: Soft matter
• 影响因子: 3.4
• 作者: R. Wulfert;U. Seifert;T. Speck
• 通讯作者: T. Speck

Effective confinement as origin of the equivalence of kinetic temperature and fluctuation-dissipation ratio in a dense shear-driven suspension.

有效约束是稠密剪切驱动悬浮液中动力学温度和波动耗散比等价的起源

• DOI: 10.1103/physreve.85.021103
• 发表时间: 2012
• 期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
• 作者: B. Lander;U. Seifert;T. Speck
• 通讯作者: T. Speck