Effective Screening of Hydrodynamic Interactions in Charged Colloidal Suspensions

Riese, D.O.; Wegdam, G.H.; Vos, Willem L.; Sprik, R.; Fenistein, Denis; Bongaerts, J.H.H.; Grübel, G.

doi:10.1103/physrevlett.85.5460

Cited by 78 publications

(108 citation statements)

References 23 publications

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“…For systems with added salt, the values of these short-time properties are located in between the zero-salt and infinite-salt (zero-charge) limits. Whereas the majority of experimentally available scattering data on charge-stabilized suspensions is in agreement with the ordering relations in equations (8) [22,23], a violation of these relations has been purportedly observed in certain scattering experiments [25,26]. Colloidal hard spheres have a common static and hydrodynamic length scale given by the particle radius a.…”

Section: Hydrodynamic and Short-time Diffusion Functionsmentioning

confidence: 70%

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: Hydrodynamic and Short-time Diffusion Functionsmentioning

confidence: 70%

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

Banchio

McPhie

Nägele

2008

J. Phys.: Condens. Matter

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“…Taking this advantage, the studies of concentrated colloidal suspensions have been energetically conducted, and the understanding of hydrodynamic interactions of diffusive motion has been developed. [36][37][38][39][40] Though the DLS experiments are conducted with full coherent light source, visible laser, the light source of XPCS is not usually fully coherent. Here, we will consider about the coherence of the X-ray obtained from the third generation synchrotron radiation source, which is a chaotic source with Gaussian intensity distribution.…”

Section: X-ray Photon Correlation Spectroscopymentioning

confidence: 99%

Surface and Interface Analyses of Polymer Brushes by Synchrotron Radiation

et al. 2013

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In the present review, we focus on the characterization of polymer brushes by quantum beam, which is regarded as a promising probe of surface and interface analysis. The polymer brushes were prepared on various shapes of surface, and proved to be benefit to various applications. Among them, the polymer brushes grafted on sphere nanoparticles and flat substrates are investigated as representative cases. The static structure of polymer brushes, especially the chain dimension of polymer brushes grafted on nanoparticles and a flat substrate, have been studied by small angle X-ray scattering (SAXS) and neutron reflectivity (NR), respectively. The microscopic dynamical properties of polymer brushes are also expected to be revealed by quantum beam. X-ray photon correlation spectroscopy (XPCS), a technique using a coherent X-ray, is one of the promising methods for microscopically understanding of dynamical properties of polymer brushes. Some of our recent studies about dynamical behavior of polymer brush immobilized nanoparticle by XPCS are also presented.

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“…Many-body HI in mobilesphere suspensions merely enlarge the effective suspension viscosity without reducing the range of the HI [32,33]. In fact, one of the first applications of the ASD simulation tool has been, in combination with experiment and theory, to show that the collective diffusion in low-salt charge-stabilized suspensions can be understood without the assumption of hydrodynamic screening [14,15,34].…”

Section: Introductionmentioning

confidence: 99%

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

Banchio

Nägele

2008

The Journal of Chemical Physics

173

319

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We present a detailed study of short-time dynamic properties in concentrated suspensions of charge-stabilized and of neutral colloidal spheres. The particles in many of these systems are subject to significant many-body hydrodynamic interactions. A recently developed accelerated Stokesian Dynamics (ASD) simulation method is used to calculate hydrodynamic functions, wavenumber-dependent collective diffusion coefficients, self-diffusion and sedimentation coefficients, and high-frequency limiting viscosities. The dynamic properties are discussed in dependence on the particle concentration and salt content. Our ASD simulation results are compared with existing theoretical predictions, notably those of the renormalized density fluctuations expansion method of Beenakker and Mazur, and earlier simulation data on hard spheres. The range of applicability, and the accuracy of various theoretical expressions for short-time properties, are explored through comparison with the simulation data. We analyze in particular the validity of generalized StokesEinstein relations relating short-time diffusion properties to the high-frequency limiting viscosity, and we point to the distinctly different behavior of de-ionized charge-stabilized systems in comparison to hard spheres.

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Effective Screening of Hydrodynamic Interactions in Charged Colloidal Suspensions

Cited by 78 publications

References 23 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

Surface and Interface Analyses of Polymer Brushes by Synchrotron Radiation

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

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