Berlin 2015 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 57: Complex Fluids and Soft Matter - Part I (joint session DY, CPP, BP)

CPP 57.4: Vortrag

Mittwoch, 18. März 2015, 15:45–16:00, BH-N 333

Dynamics of the Critical Casimir Effect in a Binary Fluid — •Sutapa Roy, Felix Höfling, and S. Dietrich — Max-Planck-Institut für Intelligente Systeme, Stuttgart and Institut für Theoretische Physik IV, Universität Stuttgart, Germany

A binary fluid mixture near its consolute point exhibits critical fluctuations of the local composition. While the static properties of the mixture are well described by the 3D Ising universality class [1], the dynamic properties involving conservation of particle number and concentration, energy, and momentum are classified as model H′ [2]. Confinement of critical fluctuations in such a mixture leads to critical Casimir forces (CCF) [3] acting on the confining surfaces.

We present results for the CCF in a symmetric binary Lennard-Jones model fluid, confined in a slit pore, close to its bulk critical point. Utilizing the computing resources of GPUs [4], molecular dynamics (MD) simulations were performed for system sizes of up to 216,000 particles and 5 orders of magnitude in time which is well beyond common computational efforts. Our results from MD and Monte Carlo simulations, for various static and dynamic quantities, both in bulk and in confinement, are compared to theory and experimental observations.
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