Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster: Colloids and Complex Liquids
CPP 20.31: Poster
Dienstag, 12. März 2013, 18:15–20:15, Poster C
Wettability controlled transfer of colloidal assemblies from wrinkled elastomers — Christoph Hanske1, •Mareen Müller1, Vera Bieber1, Moritz Tebbe1, Sarah Jessl1, Alexander Wittemann2, and Andreas Fery1 — 1University of Bayreuth, Germany — 2University of Konstanz, Germany
Assemblies of nanoparticles are promising building blocks for future sensoric devices. Highly ordered arrays of nanoparticles can be realized by convective assembly on surface-wrinkled elastomers.[1] Recently, this lithography-free procedure was developed further to allow subsequent particle transfer to solid substrates, which is a prerequisite for many technological applications.[2] Compatibility with a variety of functional particles was also demonstrated. In this contribution we discuss the roles of capillary forces and surface wettability for the wet transfer of colloidal assemblies. In contrast to adhesion-based printing or lift-off methods, conformal contact between the particles and the target substrate is not required. However, successful particle transfer depends on the wettability of the target substrate and is inhibited efficiently by a hydrophobic monolayer.[3] We demonstrate that chemically patterned substrates are sufficient to control the particle transfer locally with excellent precision. Our method is robust enough to conduct multiple deposition steps, resulting in hierarchical colloidal structures with potential applications in plasmonic sensing or the construction of metamaterials. [1] C. Lu, et al., Soft Matter 2007, 3, 1530. [2] M. Müller, et al., Nanoscale 2012, 4, 2491. [3] C. Hanske, et al., Langmuir 2012. 10.1021/la304028f