Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 18, Issue 3, Pages 825-836Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/18/3/005
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We study the sedimentation equilibrium Of low salt Suspensions of binary mixtures of charged colloids, both by Monte Carlo simulations of an effective colloids-only system and by Poisson-Boltzmann theory of a colloid-ion mixture. We show that the theoretically predicted lifting and layering effect, which involves the entropy of the screening ions and a spontaneous macroscopic electric field (Zwanikken and van Roij 2005 Europhys. Lett. 71480), can also be understood oil the basis of an effective colloid-only system with pairwise screened-Coulomb interactions. We consider, by theory and by simulation, both repelling like-charged colloids and attracting oppositely charged colloids, and we find a re-entrant lifting and layering phenomenon when the charge ratio of the colloids varies from large positive through zero to large negative values.
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