Dresden 2020 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 50: Poster Session III

CPP 50.4: Poster

Tuesday, March 17, 2020, 14:00–16:00, P1C

The role of non-adiabatic forces during the collapse of a 1D capillary system — •Anja Schreiber, Johannes Bleibel, and Martin Oettel — Institut für angewandte Physik, Universität Tübingen, Tübingen, Germany

We study the behavior of a one-dimensional system of colloidal particles trapped at a fluid interface using Brownian Dynamics (BD) simulations. Inter-facially 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. For a certain range of parameters, the system exhibits clustering behavior. After a characteristic timescale the system collapses globally and collectively to a close-packed patch, similar to a self gravitating fluid, and thus reaches the equilibrium state. Within studies of the impact of noise and starting position on the density profile during the clustering process, a significant discrepancy between simulation and Dynamical Density Functional Theory (DDFT) was found. Hence, it was concluded that non-adiabatic forces may contribute considerably to the dynamics. We obtain these non-adiabatic forces from applying an iterative scheme, developed for short-range interactions [1]. In order to investigate possible modifications for the DDFT, this method is adapted and appropriately modified for our long-ranged attractive system.

[1] D. de las Heras, J. Renner, and M. Schmidt, Phys.Rev. E 99, 023306 (2019)