Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Colloids and Complex Liquids II
CPP 36.2: Vortrag
Mittwoch, 2. April 2014, 15:15–15:30, ZEU 114
The collapse of colloidal monolayers by capillary attraction — Johannes Bleibel1, Alvaro Dominguez2, and •Martin Oettel1 — 1Institut für Angewandte Physik, Universität Tübingen — 2Fisica Teorica, Universidad de Sevilla
We investigate the evolution of a system of colloidal particles trapped at a fluid interface and interacting via capillary attraction, as function of the range of the capillary interaction and temperature. We address the collapse of a homogeneous particle distribution and of a radially symmetric (disk--shaped) distribution of finite size, both theoretically by using a perturbative approach inspired by cosmological models, as well as numerically by means of Brownian Dynamics and Dynamical Density Functional Theory. We find a ``dynamic phase diagram'', exhibiting a smooth crossover from collective (gravitational--like) collapse to local (spinodal--like) clustering. In the crossover region, the evolution exhibits a peculiar shock wave behavior at the outer rim of the disk--shaped distribution.