Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Poster: Colloids and Complex Liquids

CPP 16.26: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Rotational behavior of thermophoretic driven Janus particles at a hard wall. — •Andreas Bregulla¹, Ralf Seidel², Michael Mertig³, Klaus Kroy⁴, and Frank Chichos¹ — ¹Molecular Nanophotonics Group, University Leipzig — ²DNA Motors Group, University of Technology Dresden — ³Physikalische Chemie, Technische Universität Dresden — ⁴Soft Condensed Matter Theory Group, University Leipzig

Janus particles are particles with asymmetric surface properties of their two half spheres. Due to this asymmetry they become of large interest as building blocks for new self-organized structures or they provide new unique optical properties if one site of the sphere is coated by noble metal films. In the latter case of a metallic coating of one half, the metal can be used as optically driven heat source to generate an asymmetric temperature distribution around the particle. This asymmetric temperature distribution leads to a thermophoretically driven directed motion of the particle as recently demonstrated. The detailed mechanisms of this driven motion is,however, not clear. Especially the contributions of local charge distributions, field enhancements and the interaction with substrate is unknown. In this contribution we investigate the rotational motion of gold capped polystyrene spheres nears a boundary with help of darkfield imaging and demonstrate that the interaction with the surface leads to a restricted rotational motion.