Regensburg 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: Poster: Micro and Nanofluidics
CPP 30.14: Poster
Wednesday, March 24, 2010, 17:30–19:00, Poster C
Micro-rheology on polymer-grafted colloids — •Christof Gutsche1, Matthias Krüger2, Markus Rauscher3, Rudolf Weeber4, Jens Harting4, Yong Woon Kim5, Roland R. Netz6, and Friedrich Kremer1 — 1Institute of Experimental Physics I, Leipzig University, Germany — 2Fachbereich Physik, Universität Konstanz, Germany — 3Max-Planck-Institut für Metallforschung, Stuttgart, Germany — 4Institut für Computerphysik, Universität Stuttgart, Germany — 5School of Physics, Korea Institute for Advanced Study, Korea — 6Physics Department, Technical University Munich, 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 interaction between two single colloids in media of varying ionic strength [1], (ii) the flow resistance of one blank colloid in a polymer solution [2] and (iii) the flow resistance of single DNA-grafted colloids in different media [3,4].
[1] C. Gutsche et al. Phys. Rev. E 76, 031403 (2007) [2] C. Gutsche et al. J. Chem. Phys. 129, 084902 (2008) [3] C. Gutsche et al. Microfluidic Nanofluidic 2(5), 381 (2006) [4] Y.W. Kim et al. Macromolecules 42, 3650 (2009)