Colloidal interactions

Belloni, Luc

doi:10.1088/0953-8984/12/46/201

Cited by 307 publications

(406 citation statements)

References 197 publications

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“…where h MM (r) = g MM (r) − 1 and c eff (r) is the so-called effective direct correlation function [13,27]. An additional closure relation is needed to solve the OZ equation.…”

Section: Structurementioning

confidence: 99%

“…This procedure respects the leading role of the MI interaction, while the effect of MM correlations in this approach enters only on the level of the one-component (OCM) description. The latter approach can be modified in different ways to account for more pronounced role of macroion correlations and the resulting charge inhomogeneities using the Wigner-Seitz cell model [13]. In this case, the structure of the double layer reflects the inhomogeneous macroion (and hence the counterion) distribution via the cell construction.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the structure of the double layer reflects the inhomogeneous macroion (and hence the counterion) distribution via the cell construction. Numerical schemes based on the cell model and charge renormalization have been successful in describing properties of charged colloidal dispersions [5,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, the thermodynamic properties can be easily extracted from the same twocomponent (or multi-component) description that is used for calculation of the OCM effective charge and screening length, i.e. directly from the WS cell or jellium model [12,13,14,15,16,19,20]. These models are usually solved using the non-linear PB equation including only one colloidal particle, or MC simulation [5,12,21,22].…”

Section: Introductionmentioning

confidence: 99%

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Macroion correlation effects in electrostatic screening and thermodynamics of highly charged colloids

et al. 2006

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We study macroion correlation effects on the thermodynamics of highly charged colloidal suspensions using a mean-field theory and primitive model computer simulations. We suggest a simple way to include the macroion correlations into the mean-field theory as an extension of the renormalized jellium model of Trizac and Levin [Phys. Rev. E 69, 031403 (2004)]. The effective screening parameters extracted from our mean-field approach are then used in a one-component model with macroions interacting via Yukawa-like potential to predict macroion distributions. We find that inclusion of macroion correlations leads to a weaker screening and hence smaller effective macroion charge and lower osmotic pressure of the colloidal dispersion as compared to other mean-field models. This result is supported by a comparison to primitive model simulations and experiments for charged macroions in the low-salt regime, where the macroion correlations are expected to be significant.

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“…where h MM (r) = g MM (r) − 1 and c eff (r) is the so-called effective direct correlation function [13,27]. An additional closure relation is needed to solve the OZ equation.…”

Section: Structurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Macroion correlation effects in electrostatic screening and thermodynamics of highly charged colloids

et al. 2006

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“…A colloidal dispersion with non-adsorbing polymers form an especially useful model system. Various theoretical models of particle-polymer mixtures have been utilized in previous work, aiming to quantify the various interactions and to establish how they affect the macroscopic properties [5][6][7][8][9][10][11] . Several experimental methods are available to elucidate the structure of particlepolymer mixtures, which can then be compared with the model predictions [12][13][14][15][16][17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Theoretical predictions of structures in dispersions containing charged colloidal particles and non-adsorbing polymers

Xie

Turesson

Woodward

et al. 2016

Phys. Chem. Chem. Phys.

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We develop a theoretical model to describe structural effects on a specific system of charged colloidal polystyrene particles, upon the addition of non-adsorbing PEG polymers. This system has previously been investigated experimentally, by scattering methods, so we are able to quantitatively compare predicted structure factors with corresponding experimental data. Our aim is to construct a model that is coarse-grained enough to be computationally manageable, yet detailed enough to capture the important physics. To this end, we utilize classical polymer density functional theory, wherein all possible polymer configurations are accounted for, subject to a mean-field Boltzmann weight. We make efforts to counteract drawbacks with this mean-field approach, resulting in structural predictions that agree very well with computationally more demanding simulations. Electrostatic interactions are handled at the fully non-linear Poisson-Boltzmann level, and we demonstrate that a linearization leads to less accurate predictions. The particle charge is an experimentally unknown parameter. We define the surface charge such that the experimental and theoretical gel point at equal polymer concentration coincide. Assuming a fixed surface charge for a certain salt concentration, we find very good agreement between measured and predicted structure factors across a wide range of polymer concentrations. We also present predictions for other structural quantities, such as radial distribution functions, and cluster size distributions. Finally, we demonstrate that our model predicts the occurrence of

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