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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Complex Fluids and Soft Matter (joint session DY/CPP)
CPP 51.5: Talk
Friday, March 22, 2024, 10:30–10:45, BH-N 243
Nonequilibrium evolution in long-range attractive systems: initial state dependence and averaging in simulations and theory — •Johannes Bleibel1 and Martin Oettel2 — 1Fachbereich Physik, Universität Tübingen, Tübingen, Germany — 2Institut für angewandte Physik, Universität Tübingen, Tübingen, Germany
We investigate the dynamics of the so–called capillary collapse of colloidal particles trapped a fluid interface with 1D Brownian Dynamics (BD) simulations and Dynamical Density Functional Theory (DDFT). Interfacially trapped, micrometer–sized colloidal particles interact via long–ranged capillary attraction. The interaction is formally analogous to screened Newtonian gravity with the capillary length λ as the tuneable screening length. Within intensive studies of the dynamics in 2D, it turned out that radially averaged DDFT only captures the dynamics at initial times and largely deviates from simulation results later on. This discrepancy has been traced to the role of an initially averaged configuration in DDFT[1].
In order to shed light on the precise role of initial fluctuations in the averaging process and subsequent dynamics both in BD simulations and DDFT, we investigate the dynamics of infinitely long rods trapped at a fluid interface and thus study the dynamics of a long–ranged attractive 1D fluid under a temperature quench. We apply several distinct averaging recipes for initial conditions and noise and discuss possible effects of averaging in an alternative description using Power Functional Theory (PFT).
[1] Bleibel, Domínguez, Oettel, JPCM 28, 244021 (2016)
Keywords: Liquid Interfaces; Dynamic Density Functional Theory (DDFT); Power Functional Theory (PFT); Brownian Dynamics; Soft Matter