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Freiburger Materialforschungszentrum
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79104 Freiburg, Germany

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You are here: Home Events Dr. Stefan Walheim "Polymer-based Nanotechnology and Self-Assembled Monolayers: From Polymer Blend Lithography to the Salvinia-Effect"

Dr. Stefan Walheim "Polymer-based Nanotechnology and Self-Assembled Monolayers: From Polymer Blend Lithography to the Salvinia-Effect"

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Institute of Applied Physics (AP) and Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT)

What
  • Seminar
When Dec 16, 2015
from 02:15 PM to 03:00 PM
Where Seminarraum, FIT, Georges-Köhler-Allee 105, Freiburg
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Nano-patterning of surfaces is of vital importance for many fields of Nanotechnology. We develop methods for the structuring of surfaces based on nano phase separation in thin polymer films and by Atomic Force Microscopy (AFM) structuring techniques. The resulting patterns typically measure only one nanometer in height – they consist of films with molecular thickness: Self-Assembled Monolayers (SAMs). All patterning processes presented here have the potential to be scaled up e.g. for roll-to-roll processing, making them interesting for ship coatings, solar cells or battery applications.

With our Monolayer Polymer Blend Lithography (Monolayer PBL) we are able to pattern large areas, harnessing the structure formation in a polymer blend film. By subsequent assembly of e.g. optically switchable molecules, metals, inorganic particles like ZnO, metal-organic compounds like SCMOLs or SURMOFs or biological macromolecules like DNA or proteins we are able to achieve a variety of unique functional surfaces. Here, we use AFM techniques 1. to investigate the growth process (topography) and 2. to probe the functionality of the resulting patterns (piezo-response, optical switchability, mechanical and electrical characterization).

With Metal Polymer Blend Lithography (Metal PBL) we produce with the same ease metal films with 1 billion holes/inch2 or 1 billion metal island/inch2 with adjustable plasmonic properties.

We introduce ordered, arbitrary, layout-defined patterns into the phase morphology of a block-copolymer film being otherwise only stochastically structured. Based on this approach we can (phase-)structure the active surface of a topographically flat stamp for ink-based printing with a unique stamping resolution of 20 nm (Nano-Contact Printing).

In a biomimetic approach we are combining the described techniques to produce superhydrophobic salvinia-type surfaces. These air-retaining surfaces have a high potential of applications as drag reducing ship coatings.

1. C. Huang, A. Förste, S. Walheim, Th. Schimmel: Polymer-Blend-Lithography of Metal Films: large-area patterning with over 1 billion holes/inch2 , Beilstein J. Nanotechnol. 6, 1205–1211 (2015)
2. C. Huang, M. Moosmann, J. H. Jin, T. Heiler, S. Walheim, Th. Schimmel: Polymer blend lithography: A versatile method to fabricate nanopatterned self-assembled monolayers, Beilstein Journal of Nanotechnology 3, 620-628 (2012)
3. R. Petrosyan, C. A. Bippes, S. Walheim, D. Harder, D. Fotiadis, Th. Schimmel, D. Alsteens, D. J. Müller: Single-Molecule Force Spectroscopy of Membrane Proteins from Membranes Freely Spanning Across Nanoscopic Pores, Nano Letters 15 (5) 3624-3633 (2015)

 

invited by Dr. Michael Sommer

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