Dresden 2017 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 8: Statistical Physics far from Thermal Equilibrium

DY 8.15: Vortrag

Montag, 20. März 2017, 18:45–19:00, ZEU 118

Solvent Coarsening around a Colloid upon Cooling — •Sutapa Roy¹, S Dietrich¹, and Ania Maciolek² — ¹Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569 Stuttgart, Germany and IV. Institut für Theoretische Physik, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — ²Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, PL-01-224 Warsaw, Poland

We investigate temperature-gradient induced coarsening of a cooling binary solvent around a spherical colloidal particle, using numerical calculations and analytical theory. Our phenomenological model impersonates recent experiments in which, upon laser heating of a Janus colloid, the surrounding binary liquid mixture develops concentration gradient. Evidence of 'non-localized' coarsening is provided around a Janus colloid even if the colloid temperature is above the bulk demixing critical temperature of the solvent.