TANAKA LAB. Physics of Soft Condensed Matter The University of Tokyo Graduate School of Engineering Department of Applied Physics The University of Tokyo Institute of Industrial Science Department of Fundamental Engineering
Entrance > Research > Polymer, Liquid Crystal, Colloid, Membrane, Protein > External Field > Interplay between Wetting and Phase Separation
Polymer, Liquid Crystal, Colloid, Membrane, ProteinLiquid, Glass, GelLight and Soft Matter
Phase Separation in a Normal Fluid MixtureViscoelastic Phase SeparationPhase Separation of Colloidal SuspensionsNumerical Simulations of Viscoelastic Phase SeparationMicro-Phase Separation in Diblock CopolymerInterplay between Wetting and Phase SeparationPhase Separation under External FieldsDynamic Control of the Smectic MembranesCritical Phenomena in Polymer SolutionsCoil-Globule Transition of a Single PolymerColloidal ‘Atom’Colloidal Gel NetworkElectrophoretic Separation of Charged ParticlesAggregation of Charged Colloidal SystemsSurface-Assisted Monodomain Formation of a Lyotropic Liquid CrystalShear-Induced Topological Transitions in a Membrane SystemSpontaneous Onion-Structure FormationSelf-Organization in Phase Separation of a Lyotropic Liquid CrystalTransparent Nematic Phase in a Liquid-Crystal-Based MicroemulsionColloidal Aggregation in a Nematic Liquid CrystalPhase Separation of a Mixture of an Isotropic Liquid and a Liquid CrystalSpontaneous Partitioning of Particles in a Membrane System

Interplay between Wetting and Phase Separation

Interplay between Wetting and Phase Separation Here we consider how phase-separation kinetics and morphology are affected by the preferential wetting of a solid surface by one component of a binary fluid mixture. The behaviour is crucially dependent upon whether the spinodal decomposition is bicontinuous-type or droplet-type, i.e. the composition symmetry. Near a symmetric composition, wetting effects are strongly delocalized by hydrodynamic effects unique to bicontinuous phase separation. We discuss the physical mechanism of the unusually fast lateral growth of wetting domains found by Wiltzius and Cumming, the thickening dynamics of wetting layers, and pattern evolution under the influence of surface fields, focusing on the roles of hydrodynamics. We point out a novel possibility of double phase separation: that the quick hydrodynamic reduction of the interface area may spontaneously destabilize the phase-separated macroscopic domains and induce secondary phase separation. We also consider effects of the preferential wetting of immobile and mobile particles by one component of a fluid mixture on phase separation and the resulting complex pattern evolution. It is demonstrated that hydrodynamics always plays crucial roles in the pattern evolution of a phase-separating fluid mixture interacting with solid surfaces.

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