The sediment of mixtures of charged colloids: segregation and inhomogeneous electric fields

Details The sediment of mixtures of charged colloids: segregation and inhomogeneous electric fields The sediment of mixtures of charged colloids: segregation and inhomogeneous electric fields

2005-04-18

arxiv.org/abs/cond-mat/0504437v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1209/epl/i2005-10096-0

We theoretically study sedimentation-diffusion equilibrium of dilute binary, ternary, and polydisperse mixtures of colloidal particles with different buoyant masses and/or charges. We focus on the low-salt regime, where the entropy of the screening ions drives spontaneous charge separation and the formation of an inhomogeneous macroscopic electric field. The resulting electric force lifts the colloids against gravity, yielding highly nonbarometric and even nonmonotonic colloidal density profiles. The most profound effect is the phenomenon of segregation into layers of colloids with equal mass-per-charge, including the possibility that heavy colloidal species float onto lighter ones.

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