Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session G25: Liquid Crystals III
11:30 AM–2:30 PM,
Tuesday, March 15, 2022
Room: McCormick Place W-187A
Sponsoring
Unit:
DSOFT
Chair: Tim Atherton, Tufts
Abstract: G25.00007 : Hydrodynamics in quasi 2D liquid crystal films - lattice structures, coalescence & coarsening -*
12:42 PM–12:54 PM
Presenter:
Christoph Klopp
(Institut of experimental physics)
Author:
Christoph Klopp
(Institut of experimental physics)
Here, we demonstrate and describe different phenomena dealing with isotropic droplets and smectic islands (flat circular regions) in thin quasi 2D smectic films onboard the International Space Station (ISS). We investigated the arrangement of liquid droplets in lattice-like structures and their direct interactions, including 3D droplet coalescence in these quasi 2D system [6-8]. We developed new models for the lattice structures and compared our results for the droplet coalescence with existing models for liquid lens coalescence on liquid and solid surfaces.
Additionally we analyzed the coarsening dynamics of ensembles of flat circular regions thicker than the background film – so-called smectic islands - that is based on direct island coalescence or the exchange of material through the background film (Ostwald ripening).
Since coarsening is an important phenomenon concerning the stability of liquid emulsions or the structure of foams, we compared our results with other systems and analyzed the dominant process for the 2D coarsening dynamics.
*The authors acknowledge ?nancial support for theOASIS project from NASA Grant NNX-13AQ81G, NSFMRSEC Grant DMR 1420736, and from the DLR withinprojects OASIS-Co 50WM1127 and 50WM1430.
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