Berlin 2012 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Poster: Colloids and Complex Liquids

CPP 16.30: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Microrheology using Optical Tweezers — •Christof Gutsche, Olaf Ueberschär, Carolin Wagner, Tim Stangner, and Friedrich Kremer — Institute of Experimental Physics I, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany;

Optical Tweezers are ideal tools to carry out microfluidic and microrheological experiments with micrometer-sized objects. They enable one to measure without any mechanical contact forces acting on a particle with the extraordinary resolution of up to 5 fN. Experiments are presented on (i) the flow resistance of single DNA-grafted colloids in different media [1,2], (ii) the flow resistance of one blank colloid in a polymer solution [3] and (iii) the effective hydrodynamic radius of single DNA-grafted colloids as measured by fast Brownian motion analysis [5].

[1] C. Gutsche, M. Salomo, Y.W. Kim, R.R. Netz and F. Kremer. Microfluidic Nanofluidic 2(5), 381 (2006) ; [2] Y.W. Kim, V. Lobaskin, C. Gutsche, F. Kremer, P. Pincus and R.R. Netz. Macromolecules 42, 3650 (2009); [3] C. Gutsche and F. Kremer, M. Krueger and M. Rauscher, R. Weeber and J. Harting. J. Chem. Phys. 129, 084902 (2008); [4] C. Gutsche et al. Phys. Rev. E 76, 031403 (2007); [5] O. Ueberschär et al. Polymer 52, 1829 (2011)