Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 39: Colloids and Complex Liquids II - Dynamics and Mechanical Properties

CPP 39.6: Talk

Thursday, March 17, 2011, 11:45–12:00, ZEU 222

Colloidal particles in multiphase flow — •Florian Günther — TU Eindhoven

Emulsions stabilized by particle are ubiquitous in the food and cosmetics industry, but our understanding of the influence of microscopic fluid-particle and particle-particle interactions on the macroscopic rheology is still limited. In this contribution we present a simulation algorithm based on a multicomponent lattice Boltzmann model to describe the solvents combined with a molecular dynamics solver for the description of the solved particles. In nature colloids are generally not spherical, such as clay particles, which have a platelet like shape. As an example of anisotropic particles we study ellipsoids. Our model allows a wide variation of fluid properties, the aspect ratio m of the ellipsoid and arbitrary contact angles on the particle surfaces. We investigate some features of a single particle at a flat interface between two fluids such as the contact angle depending on particle attributes and the adsorption trajectories. Furthermore, we study the parameter dependence of the model and demonstrate its applicability by studying, at least for the special case of m=1, the formation and rheology of a ``bicontinuous interfacially jammed emulsion gel'' (bijel) and of a ``Pickering emulsion''.