Berlin 2018 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 17: Focus: Droplets (joint session DY/CPP)

DY 17.2: Vortrag

Montag, 12. März 2018, 15:45–16:00, BH-N 334

Equilibrium versus non-equilibrium positioning of droplets — •Samuel Krüger^1,2, Christoph A. Weber⁴, Jens-Uwe Sommer^2,3, and Frank Jülicher¹ — ¹Max Planck Institute for the Physics of Complex Systems — ²Leibniz Institute of Polymer Research Dresden e.V — ³Technische Universität Dresden, Institute of Theoretical Physics, Dresden, Germany — ⁴Division of Engineering and Applied Sciences, Harvard University, Cambridge, USA

The position of droplets can be controlled by concentration gradients of a component which affect phase separation. A concentration gradient can be generated by an external potential or by boundary conditions. While systems with external potentials belong to the class of equilibrium systems, applying boundary conditions corresponds to a non-equilibrium scenario. We aim to understand what is the difference between these two scenarios and how the positioning is affected. To this end, we consider a ternary system where two components phase separate while a third component regulates their phase separation. We use Monte-Carlo simulations to compare the positioning of droplets between the two scenarios. In both scenarios we find that the droplet is positioned toward the region of low or high regulator concentration depending on their interaction parameters. The essential differences are the set of interaction parameter where the switch of position occurs. The positioning of droplets is relevant in cells prior to cell division or applications in microfluidic devices such as aqueous computing.