Regensburg 2004 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.63: Poster

Donnerstag, 11. März 2004, 16:00–18:00, Poster D

Macromolecule- Flow Interaction — •Achim Jung and Christian Wagner — Experimentalphysik, Universität des Saarlandes

We present measurements on the flow of diluted polymer solutions in basic flow geometries. Our goal is to connect the statistical conformation of the macromolecules with macroscopic sample parameters such as shear or elongational viscosity. An example of basic flow geometry is the extensional flow in a droplet detachment process where the sample is confined in the thread between droplet and nozzle. Existing theoretical models are not able to explain our findings on the elongational viscosity of diluted polyelectrolyte DNA-solutions in different salinities and thus with different polymer chain flexibilities. In order to gain more insight into the microscopic conformations of the macromolecules we are setting up optical tweezers. The focus of our microscopic studies will be the meaning of hydrodynamic interaction, an effect that has been neglected in most of the theoretical predictions of macroscopic material parameters.