The Equilibrium Properties and Microstructure of Mixtures of Colloidal Particles with Long-Range, Soft Repulsions

Hunt, William; Zukoski, Charles F.

doi:10.1006/jcis.1998.5954

Cited by 10 publications

(4 citation statements)

References 42 publications

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“…Binary suspension can be prepared in a controlled way [62,63] and their structural correlation, dynamics and phase diagrams can be explored. Depending on the size and charge ratio different freezing diagrams (azeotropic, spindle, eutectic) [64,65,66,67] have been obtained in the experiments. Since the nonadditivity ∆ depends on the composition, this might point to the fact that details of the variation of ∆ with composition and also with the phases itself (fluid or crystal) determines the shape of the freezing diagrams.…”

Section: Discussionmentioning

confidence: 99%

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Allahyarov

Löwen

2009

J. Phys.: Condens. Matter

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Based on primitive model computer simulations with explicit microions, we calculate the effective interactions in a binary mixture of charged colloids with species A and B for different size and charge ratios. An optimal pairwise interaction is obtained by fitting the many-body effective forces. This interaction is close to a Yukawa (or Derjaguin-Landau-Verwey-Overbeek (DLVO)) pair potential but the AB cross-interaction is different from the geometric mean of the two direct AA and BB interactions. As a function of charge asymmetry, the corresponding nonadditivity parameter is first positive, then significantly negative and is then positive again. We finally show that an inclusion of nonadditivity within an optimal effective Yukawa model gives better predictions for the fluid pair structure than DLVO theory.

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Section: Discussionmentioning

confidence: 99%

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Allahyarov

Löwen

2009

J. Phys.: Condens. Matter

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“…Using lattice sums, a rich variety of different crystalline structures was reported to be stable, including A m B n structures with triangular, square, rectangular, and rhombic lattices, with a basis comprising various structures of A and B particles. For smaller susceptibility asymmetry, stable intermediate AB 2 and A 2 B crystals besides A and B triangular crystals were found. Here, we consider pure triangular A, pure triangular B, and substitutionally disordered triangular solid (DS) phases as the candidate structures, and density functional theory is used to study the freezing transitions.…”

Section: The Modelmentioning

confidence: 96%

“…with β = 1/k B T and λ ν as the thermal de Broglie wavelength of the νth component. The excess part that arises due to interparticle interaction is related to the two-particle direct pair correlation function of the fluid c (2) νν (|r 2 − r 1 |) as…”

Section: Density Functional Theory and Freezing Transitionsmentioning

confidence: 99%

“…Binary mixtures can exhibit rich equilibrium phase diagrams including eutectic, azeotropic, and spindle shapes as a function of composition, together with compound solids with various compositions of the two species [1][2][3][4][5][6]. Therefore, binary systems provide an ideal testbed for solidification and vitrification processes, including homogeneous and heterogeneous nucleation and crystal growth [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Density functional theory of freezing for binary mixtures of 2D superparamagnetic colloids

Mukherjee

Mishra

Löwen

2014

J. Phys.: Condens. Matter

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Density functional theory of freezing is used to study the phase diagram of a binary mixture of superparamagnetic colloidal particles in two dimensions. The particles interact via a purely repulsive potential that scales as the inverse cube of the inter-particle separation. This corresponds to a magnetic dipole interaction where the dipoles are induced by an external magnetic field applied normal to the plane. The pair correlation functions needed as input information in the density functional theory are calculated by the hypernetted chain integral equation closure. Considering the freezing into a disordered triangular solid phase, a spindle phase diagram is found for the susceptibility ratio 0.9 of the species, which changes to an azeotrope at a ratio 0.8. A eutectic-like phase diagram with an intervening solid phase emerges for the susceptibility ratio 0.7. The results are verifiable in real-space experiments on superparamagnetic colloids in external magnetic fields.

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Solidification Experiments in Single‐Component and Binary Colloidal Melts

Palberg

Lorenz

Schöpe

et al. 2008

Phase Transformations in Multicomponent Melts

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The Equilibrium Properties and Microstructure of Mixtures of Colloidal Particles with Long-Range, Soft Repulsions

Cited by 10 publications

References 42 publications

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Nonadditivity in the effective interactions of binary charged colloidal suspensions

Density functional theory of freezing for binary mixtures of 2D superparamagnetic colloids

Solidification Experiments in Single‐Component and Binary Colloidal Melts

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