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You are here: Home Events Prof. Andreas Fery "Functional polymeric/colloidal assemblies: Novel approaches from a nano-mechanics perspective"

Prof. Andreas Fery "Functional polymeric/colloidal assemblies: Novel approaches from a nano-mechanics perspective"

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Department of Physical Chemistry II, University of Bayreuth

What
  • Seminar
When Nov 11, 2011
from 01:15 PM to 02:00 PM
Where IMTEK ‐ Institut für Mikrosystemtechnik, Raum 02 (2.OG) 016/018, Haus 101, Georges-Köhler-Allee 106
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The assembly of molecular or colloidal building-blocks into functional macroscopic-structures is one of the most active areas of materials research. Mechanical concepts can provide interesting perspectives for both characterization and assembly of these materials.

In the first part, we discuss recent developments in AFM force spectroscopy: The combination of colloidal-probe AFM with state-of-the-art optical microscopy is a powerful tool for quantifying mechanics, adhesion and optical properties of ultrathin coatings and deformable colloidal particles . Especially mechano-sensitive systems, which translate mechanical stimuli into optically detectable response, can be investigated. We discuss the example of “artificial skins” based on pressure induced fluorescence quenching in brush systems in detail.

In the second part, we introduce controlled wrinkling as a “low tech”-alternative to techniques like e-beam lithography for surface patterning.  We show that sub-micron topographical and chemical patterns can be achieved on large areas using these mechanical instabilities. The assembly of colloidal particles into optically functional structures is one of the most promising applications of this concept . We demonstrate first examples of plasmonic nanoparticle assemblies and discuss their application to surface enhanced Raman spectroscopy.
 

Fery, A.; Weinkamer, R., Mechanical Properties of Micro- and Nanocapsules : Single-capsule measurements. Polymer 2007, 48, 7221-7235.
Buensow, J.; Erath, J.; Biesheuvel, P. M.; Fery, A.; Huck, W. T. S., Direct Correlation Between Local Pressure and Fluorescence Output in Mechanoresponsive Polyelectrolyte Brushes. Angewandte Chem. Int. Ed. 2011, 50 (41), 9629-9632.
Schweikart, A.; Horn, A.; Böker, A.; Fery, A., Wrinkles for templating and structure formation on the micro- and nanoscale. Advances in Polymer Science 2010, 227, 75-99.
Pazos-Perez, N.; Ni, W.; Schweikart, A.; Alvarez-Puebla, R.; Fery, A.; Liz-Marzan, L., Highly uniform SERS substrates formed by wrinkle-confined drying of gold colloids. Chemical Science 2010, 1 (2), 174-178.
 

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