Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 28: Colloids and Complex Liquids I
CPP 28.6: Vortrag
Mittwoch, 28. März 2012, 16:30–16:45, C 130
Well-defined colloidal clusters by combined chemical and topographical templating — •Christoph Hanske1, Alexander Wittemann2, and Andreas Fery1 — 1Physical Chemistry II, University of Bayreuth, Germany — 2Physical Chemistry I, University of Bayreuth, Germany
Assemblies of colloidal particles are promising building blocks for future lab-on-a-chip devices such as sensors. Recently, we have introduced the creation of large-scale ordered arrays of particles using wrinkled elastomers (1, 2). These wrinkled stamps are accessible by the systematic exploitation of buckling instabilities without any lithographic steps. By placing a wrinkled stamp onto a droplet of colloidal suspension, liquid filled channels are formed confining the particles. Due to capillary forces close packed arrays are formed during drying. While the procedure is applicable to a wide range of particles, successful colloidal assembly strongly depends on interfacial properties. In this contribution we concentrate on the influence of the wettability of both the stamps and the substrates on the deposition process. Furthermore, local variations of the wettability can be achieved by microcontact printing. Combing such chemically patterned substrates with topographical templating in wrinkles allows us to create colloidal clusters in highly regular arrangements.
1. Lu, C.; Möhwald, H.; Fery, A. Soft Matter 2007, 3, 1530-1536.
2. Schweikart, A.; Fortini, A.; Wittemann, A.; Schmidt, M.; Fery, A. Soft Matter 2010, 6 (23), 5860-5863.