Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: POSTERS Colloids, Nanoparticles and Aggregates
CPP 21.16: Poster
Mittwoch, 27. Februar 2008, 16:00–18:30, Poster A
Microstructured surfaces for templating colloidal particle assembly — •Melanie Pretzl1, Anne Horn1, Arnaud Chiche1, Ute Zettel1, Alexandra Schweikart1, Conghua Lu2, and Andreas Fery1 — 1Department of Physical Chemistry, University Bayreuth, 95440 Bayreuth — 2Max Planck Institute of Colloids and Surfaces, Wissenschaftspark Golm, 14476 Potsdam
Surfaces with patterned assemblies of colloidal particles are of interest for various tasks like controlling wetting, optical properties (optical bandgap materials), electronic properties (wire formation) or combinatorial chemistry (catalytic activity of Particles, Synthesis in hollow capsules).We present two complementary approaches for creating such surfaces which are complementary. Chemical patterning can be achieved by means of microcontact printing. We apply this technique to create surfaces which are patterned in their charge density and show that in this way the immobilization of charged Microcapsules and Micro-balloons (gas filled microcapsules) can be directed. These entities can serve as micro-reactors or sensors.Controlled wrinkling offers an alternate approach with which periodic, topographically structured surfaces can be created. We demonstrate that these surfaces, when dipped into colloidal suspensions, direct particle adsorption. The wrinkling approach is lithography free and periods as low as 150 nm can be achieved, such that assembly of nanoparticles is feasible. We show first examples of ordered assemblies of gold nanoparticles and viruses that were created using this approach and discuss their potential.