Dresden 2009 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: POSTERS Interfaces and Thin Films
CPP 28.3: Poster
Mittwoch, 25. März 2009, 17:00–19:00, P3
Controlled Wrinkling as a novel method for the fabrication of patterned surfaces — •Alexandra Schweikart1, Conghua Lu2, and Andreas Fery1 — 1University of Bayreuth, Physical Chemistry Department II, Bayreuth, Germany — 2MPI for Colloids and Interfaces, Department of Interfaces, Golm, Germany
Surfaces that are patterned on the sub-micron- or nanoscale are of great interest as building blocks for devices in areas as diverse as photonics (diffraction gratings), sensorics (pressure sensors), biotechnology (direction of cell growth), catalysis and stamps for microcontact printing. We present a new, lithography-free approach for creating such surfaces that is based on controlled wrinkling. Wrinkles develop if a soft substrate covered by a hard film is exposed to strain. Given the case that strain is controlled well and homogenous, wrinkle patterns are highly regular. They can be of sub-micron periodicity while the lateral dimensions of the substrate can be macroscopic. We use this approach to direct colloidal crystal assembly by using a template assisted self-assembly process. In the first part, we discuss recent experiments on the mechanics of surface wrinkling on the micron/submicron scale. In the second part, we focus on applications of wrinkled surfaces for structuring and templating. Here, we show that the interaction between colloidal particles and wrinkled substrates as well as capillary forces direct colloids and nanoparticles into wrinkles with high regularity.