Colloidal brazil nut effect in sediments of binary charged suspensions

Abstract

Equilibrium sedimentation density profiles of charged binary colloidal suspensions are calculated by computer simulations and density functional theory. For deionized samples, we predict a colloidal ``brazil nut'' effect: heavy colloidal particles sediment on top of the lighter ones provided that their mass per charge is smaller than that of the lighter ones. This effect is verifiable in settling experiments.

4 pages, 4 figures

References in corpus (4)

• The Reverse Brazil Nut Problem: Competition between Percolation and Condensation
• Variational Approach to Hard Sphere Segregation Under Gravity
• Comment on "Reverse Brazil Nut Problem: Competition between Percolation and Condensation"
• Equilibrium sedimentation profiles of charged colloidal suspensions

Cited by in corpus (8)

• The polydisperse cell model: Non-linear screening and charge renormalization in colloidal mixtures
• The sediment of mixtures of charged colloids: segregation and inhomogeneous electric fields
• Sedimentation of binary mixtures of like- and oppositely charged colloids: the primitive model or effective pair potentials?
• Soft repulsive mixtures under gravity: brazil-nut effect, depletion bubbles, boundary layering, nonequilibrium shaking
• Colloidal Brazil nut effect in microswimmer mixtures induced by motility contrast
• Two-dimensional colloidal mixtures in magnetic and gravitational fields
• Jellium and Cell Model for Titratable Colloids with Continuous Size Distribution
• Realisation of the Brazil-nut effect in charged colloids without external driving