Rotational diffusion in concentrated colloidal dispersions of hard spheres

Degiorgio, Vittorio; Piazza, Roberto; Jones, Robert B.

doi:10.1103/physreve.52.2707

Cited by 124 publications

(208 citation statements)

References 20 publications

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“…In future extensions of this simulation work, we will address the short-time diffusion and rheology of particles with a non-negligible attractive interaction part such as globular lysozyme proteins, and we will study the dynamics in binary colloidal mixtures. (21)), and the experimental data of Degiorgio et al [74]. The 2nd-order virial expression remains valid up to φ = 0.45.…”

Section: Discussionmentioning

confidence: 48%

“…For optically anisotropic spheres, characterized in their orientation by a unit vectorû(t), rotational dynamics can be probed by experimental techniques sensitive to their orientation [40,74]. In a depolarized dynamic light scattering measurement, e.g., the rotational self-dynamic correlation function [39],…”

Section: The Microscopic Expression For H(q) Is Given By [70]mentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 48%

Section: The Microscopic Expression For H(q) Is Given By [70]mentioning

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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“…The rotational diffusion coefficient is extracted from the gradual depolarization of the phosphorescence emitted from the excited state decay. An advantage of TPA compared to other techniques like depolarized dynamic light scattering 13,17 ͑DDLS͒ and nuclear magnetic resonance 18 ͑NMR͒ is that the required tracer particles are relatively easy to synthesize. Phosphorescent labeling is straightforward 19 and can be applied to a variety of tracer colloids, which can be surface-functionalized to control the particle interactions.…”

Section: Introductionmentioning

confidence: 99%

Rotational dynamics of colloidal tracer spheres in suspensions of charged rigid rods

Koenderink

Aarts

Philipse

2003

The Journal of Chemical Physics

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The short-time rotational dynamics of colloidal silica tracer spheres in suspensions of rigid silica rods is investigated, using time-resolved phosphorescence anisotropy, as a function of tracer radius a T , rod volume fraction , and the range Ϫ1 of the double-layer repulsions between the like-charged rods and tracer spheres. A large tracer size a T and a small screening length Ϫ1 appear to maximize hydrodynamic hindrance of tracer diffusion for given . The marked -dependence of the rotational dynamics is primarily determined by the large excluded volumes of the high-aspect ratio rods. Stokes-Einstein-Debye ͑SED͒ scaling of the rotational diffusion coefficients with the inverse viscosity of the rod suspensions holds fairly well, expect for small a T and large Ϫ1 . The ionic strength dependence of deviations from SED scaling is rationalized in terms of an effective hard-rod model with the bare length L replaced by an effective length Lϩ4 Ϫ1 .

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“…In this work, we solve this problem by using PFA (Teflon copolymerized with perfluoroalkylvinyl ether) spheres with a refractive index n ) 1.36, very close to that of water (n ) 1.33). Moreover, PFA particles are optically anisotropic, 10,11 giving the interesting opportunity to study the hindered rotational and translational mobility of the colloids in xanthan solutions by depolarized dynamic light scattering (DDLS). The PFA spheres have a radius of 93 nm, which is an order of magnitude smaller than the colloid size in many practical situations, such as suspensions of pesticide particles 3 and oilin-water emulsions.…”

Section: Introductionmentioning

confidence: 99%

Morphology and Kinetics of Phase Separating Transparent Xanthan−Colloid Mixtures

et al. 2003

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We present a study on the morphology and kinetics of depletion-induced phase separation in aqueous xanthan-colloid mixtures with light microscopy and small angle light scattering (SALS), using fluorinated colloids with a refractive index close to that of water to prevent complications of multiple scattering. Microscopy with the direction of observation perpendicular to gravity enabled us to observe the development of the microstructure during the entire phase separation process including the formation of a macroscopic interface. Bicontinuous structures typical of a spinodal decomposition mechanism were observed at early times. These structures coarsened in time until hydrodynamic flow resulted in lane formation. Close to the binodal, a nucleation-and-growth mechanism was observed with formation of droplets. The coarsening kinetics were studied in more detail with SALS and turbidity measurements. Above polysaccharide concentrations at which entanglements become dominant, a slower coarsening and macroscopic phase separation were found because of the high continuous phase viscosity.

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Rotational diffusion in concentrated colloidal dispersions of hard spheres

Cited by 124 publications

References 20 publications

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

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

Rotational dynamics of colloidal tracer spheres in suspensions of charged rigid rods

Morphology and Kinetics of Phase Separating Transparent Xanthan−Colloid Mixtures

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