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The presentation treats the successful projection of the structure of classical fluids to effective pair potentials for a 2D system of super-paramagnetic colloids under a rotating external magnetic field. Knowing the structure of a system in form of the radial distribution function from experiments, the aim is to find a simple pair potential that reproduces the pair structure. To this end, a search algorithm was designed and implemented. It can seek for the right parameters of a given potential, resulting in the best fitting radial distribution function. It is shown that this combination works well for finding the right parameters of a superposition of a Lennard Jones Potential and a Yukawa Potential. This approach was extended to an anisotropic (patchy) potential in an effort to reproduce very unusual structures found in experiments, such as network chains including a number of Y-junctions.

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Kathrin Müller, Heinrich-Heine Universität, Düsseldorf
THP Raum 104k
Contact: not specified