Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Poster: Colloids and Complex Liquids
CPP 38.21: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Like-charge attraction in confined colloidal systems — •Dmitriy Rozhkov1, Sofia Kantorovich1,2, and Marcello Sega2 — 1Ural State University, Lenin av. 51, Ekaterinburg, 620000, Russia — 2Institute fuer Computerphysik, Universitaet Stuttgart, Pfaffenwaldring 27, 70569, Stuttgart, Deutschland
In Ref. [1] it was shown that DNA molecules in aqueous solution stretched spontaneously along the walls of a glass nanochannel. The attraction of negatively charged spherical colloidal particles to the wedges was also observed. Both effects seem surprising as they demonstrate the attraction of likely charged objects in presence of monovalent salt. At the moment there is no definitive explanation for this effect. Here we use molecular dynamic simulations performed using ESPresSo [2] in order to elucidate the problem using a model system, composed by one colloidal particle and monovalent salt at different concentrations. The results of molecular dynamics simulations are also compared to the solution of the Poisson Boltzmann equation.
[1] M. Krishnan et al, Nano Lett., 7 (5) 1270 (2007) [2] H-J Limbach et al, Comput. Phys. Commun. 174(9) (704-727), 2006