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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 25: Interfaces and Thin Films II

CPP 25.3: Talk

Tuesday, March 13, 2018, 10:15–10:30, PC 203

Self-propulsion of Janus Particles near a brush Surface: Impact of the Brush Chain Length — •Mojdeh Heidari¹, Santiago Muinos Landin², Frank Cichos², and Regine von Klitzing¹ — ¹Smart Matter at Interfaces, Department of Physics, Technical University of Darmstadt, Alarich-weiß-straße 10, 64287 Darmstadt, Germany — ²Molecular Nanophotonics Group, Peter Debye Institute for Soft Matter Physics, Faculty of Physics and Earth Sciences, Universität Leipzig, Linnéstraße 5, 04103 Leipzig, Germany

GoldAu-polystyrene Janus particles demonstrate a thermophoretic induced motion under laser illumination (λ=532 nm). The plasmons in the gold cap of the particle get excited and cause the particle to create a local temperature gradient. Such out-of-equilibrium condition at the surface of the particle leads to its self-propulsion.

In this study we explore the 2D self-propulsion of Janus particles between two glass substrates. The substrate is functionalized with PNIPAM brushes. Our former experiments have proved that particles express an enhanced self-propulsion close to PNIPAM-brush. Here we alter the brush thickness and subsequently investigate its impact on the self-propulsion of the particle. Trajectories of particles are represented under different laser intensities.