Hamburg 2001 – wissenschaftliches Programm

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DY: Dynamik und Statistische Physik

DY 46: Poster

DY 46.73: Poster

Donnerstag, 29. März 2001, 15:45–18:15, Foyer S\ 3

Attraction between Like-Charged Colloids — •Rene Messina, Christian Holm, and Kurt Kremer — Max Planck Institut, Ackermannweg 10, 55128 Mainz, Germany

We report a mechanism which can lead to long range attraction between like-charged spherical macroions, stemming from the existence of metastable ionized states. We show that the ground state of a single highly charged colloid plus a few excess counterions is overcharged. For the case of two highly charged macroions in their neutralizing divalent counterion solution we demonstrate that, in the regime of strong Coulomb coupling, the counterion clouds are very likely to be unevenly distributed, leading to one overcharged and one undercharged macroion. However if the charge symmetry is broken, i. e. when the two colloidal bare charges are different in magnitude, these ionized states become stable.