Dresden 2006 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 27: POSTER Polymer Physics and Materials
CPP 27.50: Poster
Donnerstag, 30. März 2006, 17:00–19:00, P2
Single DNA Molecules in Shear Flow — •David Steinmetz1 and Christian Wagner2 — 1Geb. 38, 3. OG, Zi. 3.19, Universität des Saarlandes, 66041 Saarbrücken — 2Geb. 38, 3. OG, Zi. 3.20, Universität des Saarlandes, 66041 Saarbrücken
We present investigations of single DNA molecules in an oscillatory shear flow, that is a typical form of a time dependent rheometric flow. The molecules are labelled with a fluorescent dye (POPO-3) and observed with a EPI fluorescence microscope. The viscosity of DNA solutions in oscillatory flows is a complex quantity and at the frequency corresponding to the inverse relaxation time of the single molecules, the elastic part of the viscosity should have a maximum. The microscopic response of the molecules to the oscillatory shear flow should also be maximal at this frequency. Our goal is to associate macroscopic behaviours with microscopic ones.