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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.16: Poster
Mittwoch, 24. März 2010, 17:30–19:00, Poster B2
Intaglio Printing of Nanoparticles using Nanostructured Wrinkled Substrates — •Stephanie Hiltl1, Anne Horn1, Andreas Fery2, and Alexander Böker1 — 1Lehrstuhl für Makromolekulare Oberflächen und Materialien and DWI an der RWTH Aachen e.V., RWTH Aachen University, D-52056 Aachen, Germany — 2Lehrstuhl für Physikalische Chemie II, Universität Bayreuth, D-95440 Bayreuth, Germany
In the present project we make use of wrinkled PDMS (Polydimethylsiloxane) substrates to guide the assembly of rod-like TMV (tobacco mosaic viruses) particles. Additionally, an effective method to print the particles from the wrinkles on plain substrates is established.
The nanostructured substrates are produced by oxidizing stretched PDMS with an air plasma, generating a hard oxide top layer. When the PDMS is relaxed the mechanical contrast between the hard top and the elastomeric bottom layer results in sinoidal structured surfaces. In order to assemble the viruses on the wrinkled PDMS surface, we use a simple spin coating technique. Regular virus stripes with variable line spacings are generated over large areas in a lithography free process [1]. Wrinkled substrates with pre-aligned TMV are used as "inked" stamps to transfer the virus on flat substrates. The distance of the virus stripes is determined by the wavelength of the stamp. A small amplitude (few tens of nanometers) is crucial for intaglio printing as the ink (virus) is situated in the grooves of the structure. The residual water film, from spin coating the virus, serves as transfer medium for the particles.
[1] Horn et al., Faraday Discuss., 2009, 143, 143-150