Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.38: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Sensing Adhesion on the Nanoscale - Revealing the Contact Formation of Biomimetic Microstructures — •Jens W. Neubauer1, Johann Erath1, Dirk-Michael Drotlef2, Aránzazu del Campo2, and Andreas Fery1 — 1Universität Bayreuth, Bayreuth, Germany — 2Max-Planck-Institut für Polymerforschung, Mainz, Germany
Evolution has led to various bio-surfaces with specific functionalities. Mimicking the models of nature, the properties of man-made materials can be improved as well. For instance, adhesion can be enhanced by microstructuring of surfaces, as shown for gecko mimicked structures. To understand this effect the stress distribution in the contact area is of special interest.
Therefore, we developed a method for the detection of local contact stresses on biomimetic microstructured surfaces. This mechano-responsive system consists of a fluorescently labeled polymer brush. Its response to pressure loads was calibrated using an atomic force microscope. The brush response is sensitive to low pressures (10 kPa) with a spatial resolution better than human skin (1 µm). Under stress steric interactions arise in the polyelectrolyte brush. We investigated these interactions and compared them with existing polymer brush theories.
Using this polymer-based sensor, we studied the adhesive enhancement of microstructured surfaces combining a commercial setup (PVM-A, GeSim, Germany) with a confocal microscope. Hence, we were able to control the contact formation of the microstructured surface.