Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: POSTER: Dynamics and Diffusion

CPP 21.8: Poster

Mittwoch, 28. März 2007, 16:00–18:30, Poster B

Relaxation and transport properties of the macromolecules in solution: effects of the friction tensors — •Alexander Uvarov and Stephan Fritzche — Institut für Physik, Universität Kassel, D--34132 Kassel, Germany; uvarov@physik.uni-kassel.de.

Many problems in bio-- and chemical physics involve the transport and relaxation properties of macromolecules which immersed in solution. A few well-known examples refer to the dielectric and nuclear magnetic relaxation as well as to the depolarization of the fluorescence light. During the past decade, therefore, a large number of experiments and molecular dynamic simulations (MDS) have been carried out in order to describe the relaxation properties of the macromolecules.

In the present contribution, we explore the question of how the bead-bead and bead--solvent interaction affects the relaxation processes of macromolecules. The behaviour of the friction tensor parameters [1] are analyzed for N--bead chain and for quite different thermodynamical regimes of the solution. The results from our semi--phenomenological theory are found to compare very well with experiment [2] and MD simulations [3] over a wide range of of macromolecule--solvent mass as well as interaction strength ratios.

[1] A. Uvarov and S. Fritzsche, Phys. Rev. E73, 011111 (2006); Chem. Phys. Lett, 401, 296 (2005); Phys. Rev. Lett. submitted (2006).

[2] B. Chen, E. Sigmund and W. P. Halperin, Phys. Rev. Lett. 96, 145502 (2006).

[3] J. R. Schmidt and J. L. Skinner, J. Phys. Chem. B. 108, 6767 (2004); J. Chem. Phys. 19, 8062 (2003).