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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 11: New Instruments and Methods
CPP 11.10: Talk
Tuesday, March 27, 2012, 12:15–12:30, C 243
Soft colloidal probe AFM for quantifying mechanoresponsive brushes — •Johann Erath1, Johanna Bünsow2, Wilhelm T. S. Huck2,3, and Andreas Fery1 — 1Physical Chemistry II, University Bayreuth, Universitätsstraße 30, 95440, Bayreuth, Germany — 2Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB21EW, UK — 3Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
The aim of this contribution is to introduce a novel concept for self-reporting force sensors based on mechano-responsive polyelectrolyte brushes, which translate deformation and tension directly into changes of fluorescence intensity[1]. Force sensing experiments were performed with a combination of an atomic force microscope (AFM) with a confocal laser scanning microscope (CLSM), using the soft colloidal probe (SCP) technique. On the basis of the JKR theory, we developed a quantitative understanding of the force distribution underneath the PDMS bead, which shows that the sensor does response to compression and tension. We find an excellent pressure sensitivity in the order of 1 kPa and a lateral resolution better than 1 micron. Beside the basic concept of the technique we will show perspectives for mapping pressure fields.
[1] Bünsow, J.; Erath, J.; Biesheuvel, M.; Fery, A.; Huck, W. T. S., Angewandte Chem. Int. Ed., 50, (2011) 9629-9632 Highlighted by Nature Materials 2011, 10, p. 724