Influence of attractive forces on the solvent mediated potential of mean force between colloidal particles

Amokrane, S.

doi:10.1063/1.476166

Cited by 28 publications

(46 citation statements)

References 41 publications

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“…Good agreement was also found in a similar study of star-polymer colloid mixtures 61 where accurate star-polymer-wall potentials 62 are derived based on a coarse-graining approach 63 . In contrast, if the density of a hard-core depletant increases, then the superposition approximation is known to break down for increasing packing fraction 60,64 . The fact that the superposition approximation works well for the soft colloids at the higher densities, also raises an interesting question as to why the soft-colloid picture itself breaks down at the higher densities.…”

Section: Depletion Potentials From the Superposition Approximationmentioning

confidence: 99%

Polymer induced depletion potentials in polymer-colloid mixtures

Louis

Bolhuis

Meijer

et al. 2002

The Journal of Chemical Physics

138

151

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The depletion interactions between two colloidal plates or between two colloidal spheres, induced by interacting polymers in a good solvent, are calculated theoretically and by computer simulations. A simple analytical theory is shown to be quantitatively accurate for case of two plates. A related depletion potential is derived for two spheres; it also agrees very well with direct computer simulations. Theories based on ideal polymers show important deviations with increasing polymer concentration: They overestimate the range of the depletion potential between two plates or two spheres at all densities, with the largest relative change occurring in the dilute regime. They underestimate the well depth at contact for the case of two plates, but overestimate it for two spheres. Depletion potentials are also calculated using a coarse graining approach which represents the polymers as "soft colloids": good agreement is found in the dilute regime. Finally, the effect of the polymers on colloid-colloid osmotic virial coefficients is related to phase behavior of polymer-colloid mixtures.

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Section: Depletion Potentials From the Superposition Approximationmentioning

confidence: 99%

Polymer induced depletion potentials in polymer-colloid mixtures

Louis

Bolhuis

Meijer

et al. 2002

The Journal of Chemical Physics

138

151

View full text Add to dashboard Cite

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“…When an attractive tail is added to the small sphere± large sphere interaction we may invoke previous arguments developed for analysing the potential of mean force at in® nite dilution [27]. Because of the attraction of the big spheres by the bulk¯uid of small ones, the pure depletion e ect is counterbalanced.…”

Section: Comparison Of the Pivot Cluster Algorithm Withmentioning

confidence: 98%

“…On the other hand, starting from the observation that some real suspensions exhibit more complex behaviour [19,20], attractive forces have been considered by various authors (see, e.g., [21± 25] and references therein) mostly from the sticky hard sphere model [26] for mixtures. More recently, work from one of us [27] emphasized the modi® cation by attractive forces of the potential of the mean force at in® nite dilution. The role of non-purely-hard interactions was investigated also by Kinoshita et al [28] in the case of macroparticles in aqueous electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric mixture of hard particles with Yukawa attraction between unlike ones: a cluster algorithm simulation study

MALHERBE¹

1999

Molecular Physics

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The in¯uence of a Yukawa attraction between unlike species on the structure of an asymmetric mixture of hard particles is investigated. A recently proposed cluster algorithm for the simulation of hard particle¯uids is extended in order to treat the Yukawa tail. Starting with nonoverlapping hard core con® gurations generated by the cluster algorithm, the attractive tail is treated according to a standard Metropolis scheme. Preliminary results on the e ect of the Yukawa attraction on the pair distribution of the larger particles and the potential of mean force at in® nite dilution con® rm important changes in comparison with pure hard sphere mixtures.

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“…In general, the indirect, solvent-mediated, solute-solute interactions depend on both the solute-solvent and solvent-solvent ones, and thus may be very difficult to evaluate [6,7,20,28,29]. We will now report several very simplified cases.…”

Section: Excluded Volume Depletion Forcesmentioning

confidence: 99%

“…Several other studies of depletion forces, which go beyond the entropic HS approach by taking into account more refined representions of the solute-solvent and solvent-solvent interactions, are also available in the recent literature [6,7,20,28,29].…”

Section: Excluded Volume Depletion Forcesmentioning

confidence: 99%

Multicomponent adhesive hard sphere models and short-ranged attractive interactions in colloidal or micellar solutions

et al. 2006

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We investigate the dependence of the stickiness parameters t ij = 1/(12τ ij ) -where the τ ij are the conventional Baxter parameters -on the solute diameters σ i and σ j in multicomponent sticky hard sphere (SHS) models for fluid mixtures of mesoscopic neutral particles. A variety of simple but realistic interaction potentials, utilized in the literature to model short-ranged attractions present in real solutions of colloids or reverse micelles, is reviewed. We consider: i) van der Waals attractions, ii) hard-sphere-depletion forces, iii) polymer-coated colloids, iv) solvation effects (in particular hydrophobic bonding and attractions between reverse micelles of waterin-oil microemulsions). We map each of these potentials onto an equivalent SHS model, by requiring the equality of the second virial coefficients. The main finding is that, for most of the potentials considered, the size-dependence of t ij (T, σ i , σ j ) can be approximated by essentially the same expression, i.e. a simple polynomial in the variable σ i σ j /σ 2 ij , with coefficients depending on the temperature T , or -for depletion interactions -on the packing fraction η 0 of the depletant particles.

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Influence of attractive forces on the solvent mediated potential of mean force between colloidal particles

Cited by 28 publications

References 41 publications

Polymer induced depletion potentials in polymer-colloid mixtures

Polymer induced depletion potentials in polymer-colloid mixtures

Asymmetric mixture of hard particles with Yukawa attraction between unlike ones: a cluster algorithm simulation study

Multicomponent adhesive hard sphere models and short-ranged attractive interactions in colloidal or micellar solutions

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