Phase separation in mixtures of two sizes of silica particles dispersed in DMF on the addition of polystyrene

Zhou, Juan; Duijneveldt, Jeroen S. van; Vincent, Brian

doi:10.1080/00268976.2011.554331

Cited by 3 publications

(3 citation statements)

References 34 publications

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“…Although colloid-polymer mixtures have proven invaluable in elucidating the properties of single component fluids [5,7,8], surprisingly little attention has been given to binary colloidal mixtures. Investigations to date include sedimentation profiles where kinetics and equilib-rium phase behaviour can exhibit a complex interplay [9][10][11] and studies of dynamics where electrostatic interactions lead to non-intuitive behavior [12]. Studies of phase behaviour indicate a time-dependent stratification of the sediment into layers with differing composition [10,11].…”

Section: Introductionmentioning

confidence: 99%

“…Investigations to date include sedimentation profiles where kinetics and equilib-rium phase behaviour can exhibit a complex interplay [9][10][11] and studies of dynamics where electrostatic interactions lead to non-intuitive behavior [12]. Studies of phase behaviour indicate a time-dependent stratification of the sediment into layers with differing composition [10,11]. However, experience with single component colloids shows that complex behavior can occur under a gravitational field [13,14], and it is uncertain whether the stratification observed in [10,11] is thermodynamic or gravitational in origin.…”

Section: Introductionmentioning

confidence: 99%

“…Studies of phase behaviour indicate a time-dependent stratification of the sediment into layers with differing composition [10,11]. However, experience with single component colloids shows that complex behavior can occur under a gravitational field [13,14], and it is uncertain whether the stratification observed in [10,11] is thermodynamic or gravitational in origin.…”

Section: Introductionmentioning

confidence: 99%

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Composition inversion in mixtures of binary colloids and polymer

Zhang

Pinchaipat

Wilding

et al. 2018

The Journal of Chemical Physics

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Understanding the phase behaviour of mixtures continues to pose challenges, even for systems that might be considered "simple." Here, we consider a very simple mixture of two colloidal and one non-adsorbing polymer species, which can be simplified even further to a size-asymmetrical binary mixture, in which the effective colloid-colloid interactions depend on the polymer concentration. We show that this basic system exhibits surprisingly rich phase behaviour. In particular, we enquire whether such a system features only a liquid-vapor phase separation (as in one-component colloid-polymer mixtures) or whether, additionally, liquid-liquid demixing of two colloidal phases can occur. Particle-resolved experiments show demixing-like behaviour, but when combined with bespoke Monte Carlo simulations, this proves illusory, and we reveal that only a single liquid-vapor transition occurs. Progressive migration of the small particles to the liquid phase as the polymer concentration increases gives rise to composition inversion-a maximum in the large particle concentration in the liquid phase. Close to criticality, the density fluctuations are found to be dominated by the larger colloids.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composition inversion in mixtures of binary colloids and polymer

Zhang

Pinchaipat

Wilding

et al. 2018

The Journal of Chemical Physics

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Self-assembly in binary mixtures of spherical colloids

López-Godoy

Dı́az-Leyva

Kozina

2022

Advances in Colloid and Interface Science

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Polymers at Interfaces and the Interactions in Colloidal Dispersions

Vrij¹

1976

Pure and Applied Chemistry

1,193

1,107

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Solutions of different polymers in the same solvent are incompatible as a rule and show phase separation when they are mixed. H incompatibility is also to be observed in systems where one of the polymer components is replaced by colloidal particles, sterically stabilized by a cover of polymer chains, will be discussed in this Iecture.After a discussion of the applicability of statistical thermodynamical criteria for colloid stability we focus attention on the potential of average force between two particles, V(r), and the second virial coefficient, B2• First it is shown from general arguments that V(r) and B, always decrease in magnitude upon addition of particles identjcal to the particle pair considered. The decrease is particularly large for high molecular weight polymers.Subsequently, the analysis is extended, with the help of simple models, to mixtures of polymer colloid and polymer. It is predicted that B2 should decrease and may hecome negative when the molecular weight and concentration of the polymer are sufficiently )arge. For high molecular weight polymer this is of the order of aper cent or less. More polymer is needed for low molecular weights.The destabilization is intimately connected with the expulsion of polymer from the interstitial spaces between approaching particles hecause of "volume restriction"-and "osmotic" etiects.The predictions are in accordance with some experiments that were available. Finally the applicability of light scattering as an experimental tool in these stability problems is stressed. Results are also given of the incompatibility of two polymers in a sing)e solvent in which one of the polymers is masked i.e. does not scatter light.

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Phase separation in mixtures of two sizes of silica particles dispersed in DMF on the addition of polystyrene

Cited by 3 publications

References 34 publications

Composition inversion in mixtures of binary colloids and polymer

Composition inversion in mixtures of binary colloids and polymer

Self-assembly in binary mixtures of spherical colloids

Polymers at Interfaces and the Interactions in Colloidal Dispersions

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