Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 28: Poster Session II
MM 28.24: Poster
Dienstag, 17. März 2015, 18:30–20:30, Poster E
Measuring the Stress Distribution of Bio-Inspired Adhesives in Contact — •Jens W. Neubauer1, Longjian Xue2, Johann Erath1, Dirk-Michael Drotlef2, Aránzazu del Campo2, and Andreas Fery1 — 1Physikalische Chemie II, Universität Bayreuth, Bayreuth, Germany — 2Max-Planck-Institut für Polymerforschung, Mainz, Germany
The responsiveness and the strong restoring forces of polyelectrolyte brushes can be utilized to sense stresses on the microscale. Therefore, a polycationic brush was labeled with a fluorescent dye allowing to measure local pressures as low as 10 kPa from the mechano-response with a lateral resolution better than human skin (1 µm).
Applying a defined pressure with soft colloidal probe AFM, the fluorescence was observed with a confocal microscope. After calibration, the pressure distribution under bio-inspired microstructured adhesives in contact could be determined from the fluorescence of the polymer brush. The contact formation of the adhesives was controlled with a commercial setup (PVM-A, GeSiM).
Furthermore, the steric interactions of the polyelectrolyte brush were investigated. By force-mapping a pattern with brush-free areas, the separation on the polyelectrolyte brush could be defined without reaching the constant compliance regime.