Regensburg 2019 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 32: Complex Fluids and Soft Matter (joint session DY/CPP)
DY 32.6: Talk
Wednesday, April 3, 2019, 16:30–16:45, H3
Self-organized lattices and coalescence of droplets in freely suspended liquid crystal films — •Christoph Klopp1, Torsten Trittel1, Kirsten Harth2, Alexey Eremin1, and Ralf Stannarius1 — 1Otto von Guericke University, Institute for Physics, 39106 Magdeburg, Germany — 2Universiteit Twente, Physics of Fluids and Max Planck Center for Complex Fluid Dynamics, 7500 AE Enschede, The Netherlands
Colloids in freely suspended smectic films are an excellent system to study self-organisation in restricted (2D) dimensionality. The dynamics of the colloids in such films is fully 2D. We demonstrate the formation of two-dimensional hexagonal lattices of isotropic droplets stabilized by repulsive interactions in freely suspended films [1]. The dynamics of single droplets in a six-neighbor cage can be described using the Saffman model for mobility in a 2D fluid. We show that the modified model reproduces the experimental observations, the droplet mobility in the lattice depends only on the ratio of cage and droplet sizes, irrespective of droplet sizes. At higher temperatures, droplets coalesce. Droplets on free-standing films have the shapes of flat lentils and their coalescence dynamics are expected to be intermediate between 2D and 3D cases [3]. We measured the coalescence which is on a time scale of milliseconds depending on the radii of the involved droplets.
[1] Clark N., et al., 2017. Adv. Space. Res. 60 737
[2] Eremin, A., Baumgarten, S., Harth, K., Stannarius, R., 2011. Pys. Rev. Lett. 107, 268301.
[3] Hopper R., 1984, J. Am. Ceram. Soc. 67, C-262