Phase Behavior of Colloids in Binary Liquid Mixtures

Jayalakshmi, Yalia; Kaler, Eric W.

doi:10.1103/physrevlett.78.1379

Cited by 55 publications

(66 citation statements)

References 8 publications

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“…Such a solvent-mediated flocculation, which can be interpreted as indirect evidence for the critical Casimir force, has indeed been observed for silica spheres suspended in a binary liquid mixture of water and lutidine [30,31,32,33] (see also Ref. [34] and references therein) as well as in other binary mixtures [35,36,37,38]. However, only recently, the first direct experimental evidence of the critical Casimir force has been reported concerning the force between a spherical colloidal particle and a homogeneous [39] or chemically patterned [40,41] wall.…”

Section: Introductionmentioning

confidence: 66%

Critical Casimir interaction of ellipsoidal colloids with a planar wall

Kondrat

Harnau

Dietrich

2009

The Journal of Chemical Physics

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Based on renormalization group concepts and explicit mean field calculations we study the universal contribution to the effective force and torque acting on an ellipsoidal colloidal particle which is dissolved in a critical fluid and is close to a homogeneous planar substrate. At the same closest distance between the substrate and the surface of the particle, the ellipsoidal particle prefers an orientation parallel to the substrate and the magnitude of the fluctuation induced force is larger than if the orientation of the particle is perpendicular to the substrate. The sign of the critical torque acting on the ellipsoidal particle depends on the type of boundary conditions for the order parameter at the particle and substrate surfaces, and on the pivot with respect to which the particle rotates.

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Section: Introductionmentioning

confidence: 66%

Critical Casimir interaction of ellipsoidal colloids with a planar wall

Kondrat

Harnau

Dietrich

2009

The Journal of Chemical Physics

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“…wf (σ (3.43) (This expression for u 4 does not yet include contributions due to a discrete arrangement of the substrate atoms on a lattice; in this respect see Ref. [30].)…”

Section: Critical Wetting Transitions At Coexistencementioning

confidence: 99%

“…Near a first-order phase separation of the bulk solvent this adsorption may lead to the coating of the colloids by wetting films which snap into a bridgelike structure if two colloids come close to each other. This coagulation can become so pronounced that it results in flocculation [1][2][3][4][5]. Such experiments have inspired several theoretical investigations [6][7][8][9][10][11][12][13][14][15][16] which have shed light on various features of these complex phenomena.…”

Section: Introductionmentioning

confidence: 99%

Wetting of curved surfaces

Bieker

Dietrich

1998

Physica A: Statistical Mechanics and its Applications

115

128

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As a first step towards a microscopic understanding of the effective interaction between colloidal particles suspended in a solvent we study the wetting behavior of one-component fluids at spheres and fibers. We describe these phenomena within density functional theory which keeps track of the microscopic interaction potentials governing these systems. In particular we properly take into account the power-law decay of both the fluid-fluid interaction potentials and the substrate potentials. The thicknesses of the wetting films as a function of temperature and chemical potential as well as the wetting phase diagrams are determined by minimizing an effective interface potential which we obtain by applying a sharp-kink approximation to the density functional. We compare our results with previous approaches to this problem.

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“…Several other experimental studies followed, using different solvents and colloids. [18][19][20][21][22][23][24] In addition the effect of adding salt was investigated 25 and it was found that adding sufficient Mg 2+ ions resulted in the aggregation line flipping from the lutidine-rich phase to the water-rich phase. The phenomenon of reversible colloidal aggregation in near-critical solvents appears to be quite general.…”

Section: Introductionmentioning

confidence: 99%

Critical Casimir interactions and colloidal self-assembly in near-critical solvents

Tasios

Edison

Roij

et al. 2016

The Journal of Chemical Physics

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A binary solvent mixture close to critical demixing experiences fluctuations whose correlation length, ξ, diverges as the critical point is approached. The solvent-mediated (SM) interaction that arises between a pair of colloids immersed in such a near-critical solvent can be long-ranged and this so-called critical Casimir interaction is well-studied. How a (dense) suspension of colloids will self-assemble under these conditions is poorly understood. Using a two-dimensional lattice model for the solvent and hard disks to represent the colloids, we perform extensive Monte Carlo simulations to investigate the phase behaviour of this model colloidal suspension as a function of colloid size and wettability under conditions where the solvent reservoir is supercritical. Unlike most other approaches, where the solvent is modelled as an implicit background, our model employs an explicit solvent and treats the suspension as a ternary mixture. This enables us to capture important features, including the pronounced fractionation of the solvent in the coexisting colloidal phases, of this complex system. We also present results for the partial structure factors; these shed light on the critical behaviour in the ternary mixture. The degree to which an effective two-body pair potential description can describe the phase behaviour and structure of the colloidal suspension is discussed briefly.

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Phase Behavior of Colloids in Binary Liquid Mixtures

Cited by 55 publications

References 8 publications

Critical Casimir interaction of ellipsoidal colloids with a planar wall

Critical Casimir interaction of ellipsoidal colloids with a planar wall

Wetting of curved surfaces

Critical Casimir interactions and colloidal self-assembly in near-critical solvents

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