Regensburg 2016 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster: Colloids and Complex Fluids

CPP 12.18: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

The dynamical phase diagram of the capillary attraction induced collapse of colloidal monolayers at fluid interfaces — Johannes Bleibel¹, Alvaro Domínguez Alvarez², •Hans Joachim Schöpe¹, and Martin Oettel¹ — ¹Eberhards Karls Universität Tübingen, Auf der Morgenstelle 10, 72026 Tübingen, Germany — ²Física Teórica, Universidad de Sevilla, Apdo. 1065, 41080 Sevilla, Spain

We investigate the evolution of a system of colloidal particles, trapped at a fluid interface and interacting via capillary attraction in theory, simulation and experiment. We address the clustering behavior of an initially homogeneous particle distribution and the collapse of a radially symmetric distribution of finite size. It investigated both theoretically by using a perturbative approach inspired by cosmological models and numerically by means of Brownian dynamics (BD) and dynamical density functional theory (DDFT). Furthermore our investigation includes hydrodynamic interactions. We find an accelerated dynamics in the collapse regime. The qualitative phenomenology summarized in the dynamical phase diagram however, remains unchanged. Colloidal particle about 20 micrometer in size trapped at a water decane interface serve as the experimental counterpart. Particles trajectories can easily monitored by bright field microscopy. This allows a direct comparison between theory and experiment.