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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 20: Focus: Magnetic Soft Matter II

CPP 20.6: Hauptvortrag

Mittwoch, 25. März 2009, 11:15–11:45, ZEU 222

Using triaxial magnetic fields to form optimized particle composites — •James Martin — Sandia National Laboratories, Albuquerque, New Mexico, USA

Complex dynamics can be induced in magnetic particle suspensions by subjecting them to three orthogonal alternating magnetic fields. The range of behavior that can be induced is broad, including particle vortex formation and oscillating sheet-like structures. When such particle suspensions are polymerized in the triaxial field, a variety of surprising structures form -such as particle honeycombs and chain networks - due to the interaction of the viscosity divergence with the heterodyne field frequencies. Such materials are found to have highly optimized magnetic properties and we have completed extensive Brownian Dynamics simulations to understand the emergence of structure in these materials.