Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Interfaces and Thin Films

CPP 13.33: Poster

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

Controlling Colloidal Self-Assembly with Gradient Wrinkle Substrates in Combinatorial Experiments — Stephanie Hiltl, Jens Oltmans, and •Alexander Böker — DWI an der RWTH Aachen e.V., Lehrstuhl für Makromolekulare Materialien und Oberflächen, RWTH Aachen, D-52056 Aachen, Germany

We prepare wrinkle gradients in oxidized top layers on elastic poly(dimethylsiloxane) (PDMS) substrates covering several millimeters of the sample. While the amplitude of the gradient structure ranges from 7-230 nm, the wavelength spans several hundred nanometers (250-900 nm). Crucial for the gradient preparation is partial shielding of the PDMS sample during plasma oxidation. We take advantage of the newly developed surface geometry for combinatorial experiments regarding the assembly of microgels as a model particle system. By variation of the ratio of particle radius vs. wrinkle wavelength, we scan and optimize the influence of the wrinkle dimensions on particle shape, particle-sample interaction and the particle assembly in a single experiment.