8th Liquid Matter Conference September 6-10, 2011 Wien, Austria ...

Wed 711:10-14:00P5.117Dynamics in dispersions of charged particles: from bigcolloids to small proteinsGerhard Naegele 11 Research Centre Juelich, Institute of Complex Systems, Leo-Brandt Street, 52428,Juelich, GermanyWe report on our recent work on the dynamics of charged colloids and bio-molecules. The shorttimeand long-time dynamics of model systems of large, micron-sized colloids and small, nanosizedproteins is studied using simulation and many-body theory in conjunction with scatteringexperiments. Transport properties are discussed including shear viscosity and generalized sedimentationvelocity, translational and rotational diffusion coefficients, and scattering functions[1, 2]. The viscosity in dense systems of solvent-permeable particles and the validity of generalizedStokes-Einstein relations between their diffusion and rheological properties are explored[3]. A far-reaching dynamic scaling behavior relating long-time to short-time dynamics is shownto apply approximately to charged colloids [4]. We demonstrate that methods developed for colloidscan be successfully applied to solutions of proteins such as bovine serum albumin [5].[1] M. Heinen, A. J. Banchio, P. Holmqvist and G. Nägele, J. Appl. Cryst. 43, 970 (2010).[2] M. Heinen and G. Nägele, J. Chem. Phys. 134, 044532 ( 2011).[3] G. C. Abade, B. Cichocki, M. L. Ekiel-Jezewska, G. Nägele and E. Wajnryb, J. Chem. Phys.133, 084906 (2010) ; submitted to J. Chem. Phys. (2011).[4] P. Holmqvist and G. Nägele, Phys. Rev. Lett. 104, 058301 (2010).[5] Collaboration with biophysics group of F. Schreiber, Tübingen, Germany, submitted (2011).117