Short-time transport properties in dense suspensions: From neutral to charge-stabilized colloidal spheres

Banchio, Adolfo J.; Nägele, Gerhard

doi:10.1063/1.2868773

Cited by 173 publications

(351 citation statements)

References 95 publications

(184 reference statements)

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“…which includes a correction term 7.9 φ 3 that describes the viscosity contribution arising from binary particle correlations. It is of cubic order since in deionized systems the peak position of the radial distribution function scales like φ −1/3 [12]. We can see in figure 5 that this expression conforms rather well with the ASD data on deionized suspensions.…”

Section: High-frequency Viscositysupporting

confidence: 71%

“…The ASD simulation results for neutral hard spheres, and charge-stabilized spheres at zero added salt, are depicted in figures 1 and 2, respectively, for volume fractions φ as indicated. It should be noted that [12]. In contrast to this, in saltfree suspensions of strongly charged spheres, H(q m ) increases sublinearly in φ at small concentrations, characterized by an exponent of about 0.4.…”

Section: Hydrodynamic and Short-time Diffusion Functionsmentioning

confidence: 76%

“…In dilute deionized systems, one can approximate the integral using a schematic model for g(x). This leads to the result (see [12] for its derivation) Displayed are our ASD simulation data in comparison with the hard-sphere simulation fit formula of Ladd in equation (9), and the expression in equation (11) for deionized suspensions that derives from a schematic model of the pair distribution function. which includes a correction term 7.9 φ 3 that describes the viscosity contribution arising from binary particle correlations.…”

Section: High-frequency Viscositymentioning

confidence: 99%

“…Very recently [12], we have reported on a comprehensive simulation study on the short-time dynamics of charged colloidal spheres described in the OCM model. In the following, an extension of this study will be presented with additional new results.…”

Section: Short-time Dynamic Propertiesmentioning

confidence: 99%

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Hydrodynamic and electrokinetic effects on the dynamics of charged colloids and macromolecules

Banchio

McPhie

Nägele

2008

J. Phys.: Condens. Matter

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Abstract. We explore dynamic processes in suspensions of charge-stabilized colloidal particles and biological macromolecules. Various short-time transport properties including diffusion functions and the high-frequency viscosity, have been calculated by means of a recently developed accelerated Stokesian Dynamics simulation tool. This has allowed us to study dense suspensions with many-body hydrodynamic interactions. The results of this study are used to explore the validity of generalized StokesEinstein relations, and the possibility of measuring self-diffusion at a finite scattering wave number. The influence of the electrolyte ion dynamics on the colloidal longtime self-diffusion in non-dilute suspensions of small colloids is determined using a many-component mode-coupling theory that accounts for the inter-ionic hydrodynamic interactions. We investigate the influence of the asymmetry in the electrolyte ion charges and mobilities on the friction experienced by the charged colloids. It is shown that these asymmetries affect the electrolyte friction significantly, and that the electrolyte friction contribution to self-diffusion decreases with increasing colloid concentration.Hydrodynamic and electrokinetic effects in charge-stabilized colloids 2

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Section: High-frequency Viscositysupporting

confidence: 71%

Section: Hydrodynamic and Short-time Diffusion Functionsmentioning

confidence: 76%

Section: High-frequency Viscositymentioning

confidence: 99%

Section: Short-time Dynamic Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Hydrodynamic and electrokinetic effects on the dynamics of charged colloids and macromolecules

Banchio

McPhie

Nägele

2008

J. Phys.: Condens. Matter

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“…These theories have been verified by experiments on various colloidal systems with different pair-interaction potentials [15,16,17,18].…”

Section: Short-time Evanescent Wave Dynamicsmentioning

confidence: 69%

The intensity correlation function in evanescent wave scattering

Cichocki

Wajnryb

Bławzdziewicz

et al. 2010

The Journal of Chemical Physics

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As a first step towards the interpretation of dynamic light scattering with evanescent illumination, in order to probe dynamics near walls, we develop a theory for the initial slope of the intensity auto-correlation function for suspensions of interacting spheres. An expression for the first cumulant is derived that is valid for arbitrary concentrations, which generalizes a well-known expression for the short-time, wave-vector dependent collective diffusion coefficient in bulk to the case where a wall is present. Explicit expressions and numerical results for the various contributions to the initial slope are obtained within a leading order virial expansion. The dependence of the initial slope on the components of the wave vector parallel and perpendicular to the wall, as well as the dependence on the evanescent-light penetration depth are discussed. For the hydrodynamic interactions 1 between colloids and between the wall, which are essential for a correct description of the near-interface dynamics, we include both far-field and lubrication contributions. Lubrication contributions are essential to capture the dynamics as probed in experiments with small penetration depths. Simulations have been performed to verify the theory, and to estimate the extent of the concentration range where the virial expansion is valid. The computer algorithm developed for this purpose will also be of future importance for the interpretation of experiments, and to develop an understanding of near-interface dynamics, at high colloid concentrations.

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Phase Behavior of Bowl‐Shaped Colloids: Order and Dynamics in Plastic Crystals and Glasses

Meijer

Crassous

2018

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Charged fluorescent bowl-shaped colloids consisting of a polystyrene core surrounded by a poly(N-isopropylmethacrylamide) shell are obtained by nanoengineering spherical composite microgels. The phase diagram of these soft bowl-shaped colloids interacting through long-range Yukawa-type interactions is investigated using confocal laser scanning microscopy. The bowl-shaped structure leads to marked differences in phase-behavior compared to their spherical counterpart. With increasing number density, a transition from a fluid to a plastic crystal phase, with freely rotating particles, followed by a glass-like state is observed. It is found that the anisotropic bowl shape frustrates crystallization and slows down crystallization kinetics and causes the glass-like transition to shift to a significantly lower volume fraction than for the spheres. Quantitative analysis of the positional and orientational order demonstrates that the plastic crystal phase exhibits quasi-long range translational order and orientational disorder, while in the disordered glass-like phase the long-range translational order vanishes and short-range rotational order appears, dictated by the specific bowl shape. It is further shown that the different structural transitions are characterized by decoupling of the translational and orientational dynamics.

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Short-time transport properties in dense suspensions: From neutral to charge-stabilized colloidal spheres

Cited by 173 publications

References 95 publications

Hydrodynamic and electrokinetic effects on the dynamics of charged colloids and macromolecules

Hydrodynamic and electrokinetic effects on the dynamics of charged colloids and macromolecules

The intensity correlation function in evanescent wave scattering

Phase Behavior of Bowl‐Shaped Colloids: Order and Dynamics in Plastic Crystals and Glasses

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