Berlin 2008 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 34: POSTERS Polymerphysics
CPP 34.51: Poster
Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A
Polyelectrolyte-Compression Forces between Spherical DNA Brushes — •Kati Kegler1, Martin Konieczny2, Gustavo Dominguez-Espinosa1, Christof Gutsche1, Matthias Salomo1, Friedrich Kremer1, and Christos N. Likos2 — 1Institute for Experimental Physics I, University of Leipzig, Linestr. 5, D-04103 Leipzig, Germany — 2Institute for Theoretical Physics II: Soft Matter, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225 Düsseldorf, Germany
Optical tweezers are employed to measure the forces of interaction between a single pair of DNA-grafted colloids in dependence of the molecular weight of the DNA-chains, and the concentration and valence of the surrounding ionic medium [1]. The resulting forces are short-range and set in as the surface-to-surface distance between the colloidal cores reaches the value of the brush height. The measured force-distance dependence is analyzed by means of a theoretical treatment based on the compression of the chains on the surface of the opposite-lying colloid. Quantitative agreement with the experiment is obtained for all parameter combinations. [2]
[1] K. Kegler, M. Salomo, and F. Kremer, PRL 98, 058304 (2007)
[2] Kati Kegler, Martin Konieczny, Gustavo Dominguez-Espinosa,Christof Gutsche, Matthias Salomo, Friedrich Kremer, and Christos N. Likos submitted to PRL