Wetting-induced effective interaction potential between spherical particles

Abstract

Using a density functional based interface displacement model we determine the effective interaction potential between two spherical particles which are immersed in a homogeneous fluid such as the vapor phase of a one-component substance or the A-rich liquid phase of a binary liquid mixture composed of A and B particles. If this solvent is thermodynamically close to a first-order fluid-fluid phase transition, the spheres are covered with wetting films of the incipient bulk phase, i.e., the liquid phase or the B-rich liquid, respectively. Below a critical distance between the spheres their wetting films snap to a bridgelike configuration. We determine phase diagrams for this morphological transition and analyze its repercussions on the effective interaction potential. Our results are accessible to force microscopy and may be relevant to flocculation in colloidal suspensions.

30 pages, RevTeX, 8 Figures

Cited by in corpus (29)

• Critical Casimir effect in classical binary liquid mixtures
• Effective forces in colloidal mixtures: from depletion attraction to accumulation repulsion
• Coefficient of restitution for wet particles
• Colloquium: Phase transitions in polymers and liquids in electric fields
• Collective behavior of colloids due to critical Casimir interactions
• Effective forces between colloids at interfaces induced by capillary wave-like fluctuations
• Trapping colloids near chemical stripes via critical Casimir forces
• Solvent mediated interactions between model colloids and interfaces: A microscopic approach
• The Importance of Boundary Conditions for Fluctuation Induced Forces between Colloids at Interfaces
• Attractive interaction and bridging transition between neutral colloidal particles due to preferential adsorption in a near-critical binary mixture
• Solvent mediated interactions close to fluid-fluid phase separation: microscopic treatment of bridging in a soft core fluid
• Microscopic theory of solvent mediated long range forces: influence of wetting
• Structure and aggregation of colloids immersed in critical solvents
• Effective pair interactions between colloidal particles at a nematic-isotropic interface
• Interaction and flocculation of spherical colloids wetted by a surface-induced corona of paranematic order
• Bridging transitions for spheres and cylinders
• Stability of Binary Mixtures in Electric Field Gradients
• Mesoscopic analysis of Gibbs' criterion for sessile nanodroplets on trapezoidal substrates
• Liquid bridging of cylindrical colloids in near-critical solvents
• Depletion force in the infinite-dilution limit in a solvent of nonadditive hard spheres
• Bridging of liquid drops at chemically structured walls
• Effective Pair Interaction of Patchy Particles in Critical Fluids
• Bridging transitions and capillary forces for colloids in a slit
• Wetting behavior of a colloidal particle trapped at a composite liquid-vapor interface of a binary liquid mixture
• Scaling of wetting and pre-wetting transitions on nano-patterned walls
• Analytical Form of Forces in Hydrophobic Collapse
• Solvation forces in Ising films with long-range boundary fields: density-matrix renormalization-group study
• Effect of line tension on axisymmetric nanoscale capillary bridges at the liquid-vapor equilibrium
• Effective Hamiltonian for a liquid-gas interface fluctuating around a corrugated cylindrical substrate in the presence of van der Waals interactions