Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: Colloids and Complex Liquids I
CPP 42.3: Vortrag
Donnerstag, 25. März 2010, 11:45–12:00, H39
Building complex arrays of colloidal particles by tuning their interactions with charged surfaces — •Christoph Hanske1, Andreas Fery1, and Alexander Wittemann2 — 1Department of Physical Chemistry II, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany — 2Department of Physical Chemistry I, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
Recently two-dimensional and three-dimensional mesostructures of colloidal particles have attracted the attention of material scientists due to their photonic properties. Whereas classical methods of particle deposition usually yield hexagonally ordered layers, more complex patterns are desired to vary the optical properties of the obtained materials. In order to control the interactions between particles and substrates, tailor-made colloids with a glassy core carrying a soft shell of polyelectrolyte brushes were synthesized. These particles are responsive to external stimuli like ionic strength or pH-value. Variation of these parameters does not only allow tuning the shape of the particles in solution, but also their interaction with charged surfaces. Formation of complex structures was accomplished by selective particle deposition on substrates chemically patterned by classic or lithography-free microcontact printing. In this contribution we will discuss decisive parameters governing the assembly into structured arrays which open up new avenues for building photonic materials.