Experimental study and model simulation of spinodal decomposition in a binary mixture under shear

Chan, C. K.; Perrot, F.; Beysens, Daniel

doi:10.1103/physreva.43.1826

Cited by 64 publications

(57 citation statements)

References 23 publications

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“…25,27,28 The domains cannot grow indefinitely in the shear-gradient direction but can attain a ratedependent nonequilibrium steady state; it is not clear whether the growth in the two perpendicular directions also saturates. 25,29 Shear may also be applied to induce phase separation in dynamically asymmetric mixtures. 30,31 Deviations from the ideal case also occur in the presence of walls and other fixed obstacles, which limit the attainable domain size, interfere with the buildup of a hydrodynamic flow field, and may have a preference for wetting by either constituent of the mixture.…”

Section: Introductionmentioning

confidence: 99%

“…An externally imposed shear flow both accelerates and hinders the phase separation process by the continuous transport, elongation, and resulting ruptures of the domains. 25,26 In combination with the interfacial driving force, these give rise to anisotropic growth of the domains, with two linear growth processes in the flow-vorticity plane and a possibly supralinear growth, ␣ Ͼ 1, in the sheargradient direction. 25,27,28 The domains cannot grow indefinitely in the shear-gradient direction but can attain a ratedependent nonequilibrium steady state; it is not clear whether the growth in the two perpendicular directions also saturates.…”

Section: Introductionmentioning

confidence: 99%

“…25,26 In combination with the interfacial driving force, these give rise to anisotropic growth of the domains, with two linear growth processes in the flow-vorticity plane and a possibly supralinear growth, ␣ Ͼ 1, in the sheargradient direction. 25,27,28 The domains cannot grow indefinitely in the shear-gradient direction but can attain a ratedependent nonequilibrium steady state; it is not clear whether the growth in the two perpendicular directions also saturates. 25,29 Shear may also be applied to induce phase separation in dynamically asymmetric mixtures.…”

Section: Introductionmentioning

confidence: 99%

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Spinodal decomposition of asymmetric binary fluids in a micro-Couette geometry simulated with molecular dynamics

Thakre

Otter

Padding

et al. 2008

The Journal of Chemical Physics

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. The spinodal decomposition of quenched polymer/solvent and liquid-crystal/solvent mixtures in a miniature Taylor-Couette cell has been simulated by molecular dynamics. Three stacking motifs, each reflecting the geometry and symmetry of the cell, are most abundant among the fully phase separated stationary states. At zero or low angular velocity of the inner cylindrical drum, the two segregated domains have a clear preference for the stacking with the lowest free energy and hence the smallest total interfacial tension. For high shear rates, the steady state appears to be determined by a minimum dissipation mechanism, i.e., the mixtures are likely to evolve into the stacking demanding the least mechanical power by the rotating wall. The partial slip at the polymer-solvent interfaces then gives rise to a new pattern: A stack of three concentric cylindrical shells with the viscous polymer layer sandwiched between two solvent layers. Neither of these mechanisms can explain all simulation results, as the separating mixture easily becomes kinetically trapped in a long-lived suboptimal configuration. The phase separation process is observed to proceed faster under shear than in a quiescent mixture. Related Articles

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spinodal decomposition of asymmetric binary fluids in a micro-Couette geometry simulated with molecular dynamics

Thakre

Otter

Padding

et al. 2008

The Journal of Chemical Physics

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“…This occurs during segregation in driven sheared systems 5,6,7 , flowing fluids 8 , shaken granular matter 9,10 , and non-equilibrium liquid-liquid binary mixtures 11 , and it has been reproduced in computer simulations of driven colloidal 12 and fluid 4,13 systems, for instance. Further examples are the anisotropies observed in both high-temperature superconductors 14,15 and electron gases 16,17 .…”

Section: Introductionmentioning

confidence: 99%

Nonequilibrium anisotropic phases, nucleation, and critical behavior in a driven Lennard-Jones fluid

2006

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We describe short-time kinetic and steady-state properties of the non-equilibrium phases, namely, solid, liquid and gas anisotropic phases in a driven Lennard-Jones fluid. This is a computationallyconvenient two-dimensional model which exhibits a net current and striped structures at low temperature, thus resembling many situations in nature. We here focus on both critical behavior and details of the nucleation process. In spite of the anisotropy of the late-time "spinodal decomposition" process, earlier nucleation seems to proceed by Smoluchowski coagulation and Ostwald ripening, which are known to account for nucleation in equilibrium, isotropic lattice systems and actual fluids. On the other hand, a detailed analysis of the system critical behavior rises some intriguing questions on the role of symmetries; this concerns the computer and field-theoretical modeling of non-equilibrium fluids.

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“…The shear flow deforms the domains, interfering with their growth so that it competes with the thermodynamic force driving the phase separation. Many theoretical [4][5][6][7] and experimental [8][9][10] studies have investigated the effect of the shear flow on the growth of the domains and the exponent α. In this work we focus on a different aspect of the effect of shear: eventually the binary fluid tends towards a dynamic, nonequilibrium steady state in which the coarsening instability is stopped by the shear flow [5,11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of shear flow on the stability of domains in two-dimensional phase-separating binary fluids

Frischknecht

1997

Phys. Rev. E

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We perform a linear stability analysis of extended domains in phase-separating fluids of equal viscosity, in two dimensions. Using the coupled Cahn-Hilliard and Stokes equations, we derive analytically the stability eigenvalues for long wavelength fluctuations. In the quiescent state we find an unstable varicose mode which corresponds to an instability towards coarsening. This mode is stabilized when an external shear flow is imposed on the fluid. The effect of the shear is seen to be qualitatively similar to that found in experiments. 64.75.+g,47.20.Hw,

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Experimental study and model simulation of spinodal decomposition in a binary mixture under shear

Cited by 64 publications

References 23 publications

Spinodal decomposition of asymmetric binary fluids in a micro-Couette geometry simulated with molecular dynamics

Spinodal decomposition of asymmetric binary fluids in a micro-Couette geometry simulated with molecular dynamics

Nonequilibrium anisotropic phases, nucleation, and critical behavior in a driven Lennard-Jones fluid

Effect of shear flow on the stability of domains in two-dimensional phase-separating binary fluids

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