Microstructure of a near-critical colloidal dispersion under stationary shear flow

Wang, Hao; Lettinga, M. P.; Dhont, Jan K. G.

doi:10.1088/0953-8984/14/33/304

Cited by 14 publications

(11 citation statements)

References 28 publications

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“…The dashed and solid lines represent the results of our simulations, using the pair-potentials in eq. (8) and (9). In the charged system, the prefactor and the inverse screening length has been used as a fit-parameter.…”

Section: Results: Three-body Distribution Functionsmentioning

confidence: 99%

Triplet correlations in two-dimensional colloidal model liquids

Ruß¹,

Zahn²,

Grünberg³

2003

J. Phys.: Condens. Matter

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Three-body distribution functions in classical fluids have been theoretically investigated many times, but have never been measured directly. We present experimental three-point correlation functions that are computed from particle configurations measured by means of video-microscopy in two types of quasi-two-dimensional colloidal model fluids: a system of charged colloidal particles and a system of paramagnetic colloids. In the first system the particles interact via a Yukawa potential, in the second via a potential Γ/r 3 . Varying the particles density in the charged system, or, the interaction strength Γ in the magnetic system, one can systematically explore how triplet correlations behave if the coupling between the particles changes. We find for both systems very similar results: on increasing the coupling between the particles one observes the gradual formation of a crystal-like local order due to triplet correlations, even though the system is still deep inside the fluid phase. These are mainly packing effects as is evident from the close resemblance between the results for the two systems having completely different pair-interaction potentials. To demonstrate that triplet correlations are significant not only locally, but also when integrated over the whole volume we consider the Born-Green equation and show that in a strongly interacting system this equation can be satisfied only with the full triplet correlation function but not with three-body distribution functions obtained from superposing pair-correlations (Kirkwood superposition approximation).

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Section: Results: Three-body Distribution Functionsmentioning

confidence: 99%

Triplet correlations in two-dimensional colloidal model liquids

Ruß¹,

Zahn²,

Grünberg³

2003

J. Phys.: Condens. Matter

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“…In this section, an existing theory [32,41] on the shearinduced distortion of the Ornstein-Zernike structure factor will be briefly reviewed. One of the assumptions involved in deriving an explicit expression for the structure factor is incorrect on close approach to the critical point, and will be reconsidered in the subsequent section.…”

Section: Theoretical Prediction Without Distortions Of Short-rangmentioning

confidence: 99%

“…Here we shall consider a theory that applies to near-critical dispersions of colloidal spheres, that has been developed by one of the authors (J.K.G.D.) [32,41]. In this theory, it is assumed that the shear-induced distortions of short-ranged microstructural order can be neglected.…”

Section: Introductionmentioning

confidence: 99%

Microstructural response of a near-critical colloid-polymer mixture to shear flow

2004

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Long-ranged microstructural order of a near-critical colloid-polymer mixture under stationary and oscillatory shear flow is studied by means of time-resolved small-angle light scattering. The distance from the critical point, the shear rate, and the frequency of oscillation are systematically varied. Unexpected shear-induced distortions of critical microstructural order is observed in directions perpendicular to the flow direction, more so on closer approach of the gas-liquid critical point. The measured distortion of long-ranged order can be quantitatively understood on the basis of an approximate solution of the Smoluchowski equation, provided that a nonanalytical distortion of short-ranged microstructural order is assumed. These short-ranged microstructural changes, induced by the flow, account for the observed distortion perpendicular to the flow direction, and are responsible for the shear-induced shift of the location of the gas-liquid critical point. The importance of short-ranged correlations renders the behavior of critical systems under shear flow nonuniversal. The origin of the nonanalytic dependence of short-ranged distortions on the shear rate remains unclear. Including these short-ranged microstructural distortions, we find a good agreement between theory and experiment for both stationary and oscillatory shear flow.

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“…In addition, the three-particle correlations has an essential impact for different processes in condensed systems. Thus, an account for three-particle correlations is required to explain the dynamic heterogeneity in liquids [5,6], to describe of transport properties in chemical reactions [4,7], to study the structural heterogeneity of materials at mechanical deformations [8,9], to detect the nuclei of on ordered phase (i.e. crystalline, quasicrystalline) [10,11], to describe the amorphization of liquids at rapid cooling [2,4,12].…”

Section: Introductionmentioning

confidence: 99%

Three-particle correlations in liquid and amorphous aluminium

Galimzyanov

Мокшин

2017

Physica A: Statistical Mechanics and its Applications

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Analysis of three-particle correlations is performed on the basis of simulation data of atomic dynamics in liquid and amorphous aluminium. A three-particle correlation function is introduced to characterize the relative positions of various three particles -the so-called triplets. Various configurations of triplets are found by calculation of pair and three-particle correlation functions. It was found that in the case of liquid aluminium with temperatures 1000 K, 1500 K, and 2000 K the three-particle correlations are more pronounced within the spa-* Corresponding author

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Microstructure of a near-critical colloidal dispersion under stationary shear flow

Cited by 14 publications

References 28 publications

Triplet correlations in two-dimensional colloidal model liquids

Triplet correlations in two-dimensional colloidal model liquids

Microstructural response of a near-critical colloid-polymer mixture to shear flow

Three-particle correlations in liquid and amorphous aluminium

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