Self-organization of growing and decaying particles

Карпов, В. Г.; Oxtoby, David W.

doi:10.1103/physreve.55.7253

Cited by 19 publications

(8 citation statements)

References 13 publications

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“…So any chemical reaction driving the drops is ruled out. One possible mechanism for the motion of drops is the dependence of the I-N interfacial tension on the dopant concentration, which is similar to that proposed by Karpov and Oxtoby [2]. A nematic droplet expels the dopant as it grows.…”

mentioning

confidence: 85%

“…The explanation for such domain growth, which is faster than that due to diffusive coalescence, was provided by the coalescence-induced coalescence mechanism and attraction due to the overlap of concentration fields of nearby drops [20]. More recently, it was predicted, in the context of nucleating clusters, that a flow along the droplet surface, resulting from the nonuniform distribution of solutes around it, can lead to directed motion of the clusters [2]. The phenomena we report in this Letter is distinctly different from these two.…”

mentioning

confidence: 97%

“…Understanding different mechanisms leading to such directed motion is also of importance in materials processing. Motivated by these, many processes that can lead to such motion have been predicted [1][2][3][4][5][6][7][8][9]. Examples are conversion of chemical energy to mechanical work [5], osmotic work obtained by transporting solvent molecules along the gradient [10], and gradients in solute concentration resulting from a chemical reaction catalyzed by the particle surface [6].…”

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confidence: 99%

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Self-Propulsion of Nematic Drops: Novel Phase Separation Dynamics in Impurity-Doped Nematogens

et al. 2006

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We report a novel phase separation dynamics, mediated by self-propelled motion of the nucleated drops, in a mixture of a nematogen and an isotropic dopant. We show that surface flow, induced by the gradient in the concentration of the dopant expelled by the growing drops, provides the driving force for the propulsion of nematic droplets. While the liquid crystal-isotropic transition is used here to demonstrate the phenomenon, self-propulsion should be observable in many other systems in which the dynamics of a conserved order parameter is coupled to a nonconserved order parameter.

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confidence: 97%

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Self-Propulsion of Nematic Drops: Novel Phase Separation Dynamics in Impurity-Doped Nematogens

et al. 2006

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“…In related works, Karpov and Karpov and Oxtoby noticed that capillary forces drive the motion of nucleating droplets along a composition gradient, leading to particle clustering and direct coalescence. A similar phenomenon was also observed by Santonicola et al, who noticed that convection starts to occur as soon as the temperature of the mixture reaches its critical value, well before the appearance of nucleating droplets.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evidence of the Motion of a Single Out-of-Equilibrium Drop

2007

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We show experimentally that when a single, neutrally buoyant drop is injected into a binary mixture either it remains quiescent or it moves, depending on whether the composition of the drop and that of the surrounding phase coincide with the equilibrium concentrations. In general, the movement of out-of-equilibrium drops, which is called diffusiophoresis, is induced by the Korteweg body force. This force is proportional to the chemical potential gradient and is therefore nonzero only when the system is in chemical nonequilibrium. In this letter, we show experimentally that this movement occurs for a single drop as well, even when the initial condition is (almost) isotropic. This instability, although it does not have a complete analytical explanation, has been predicted in the numerical simulations by Vladimirova et al. (Vladimirova, N.; Malagoli, A.; Mauri, R. Phys. Rev. E 1999, 60, 2037).

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“…In the meantime, Pilat and Prem proposed a device that makes use of diffusiophoresis to scrub the pollutant particles from the air. Their idea was further improved by Wang et al Karpov and Oxtoby investigated theoretically the capillary flow of liquid drops induced by the concentration gradient, which was supported recently by experimental observations made by Molin et al Molin et al predicted that a 10−100 μm drop might move at a speed exceeding 10 μm/s. As for drops suspended in electrolyte solutions, Baygents and Saville studied numerically the diffusiophoresis of a single liquid drop or bubble with a finite element method; hence their results are applicable to only very dilute suspensions.…”

Section: Introductionmentioning

confidence: 88%

Diffusiophoresis of Concentrated Suspensions of Liquid Drops

Lou

Lee

2008

J. Phys. Chem. C

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The diffusiophoresis of concentrated suspensions of liquid drops subject to a small electrolyte gradient is analyzed theoretically at arbitrary levels of surface potential and double-layer thickness. The effect of doublelayer polarization and double-layer overlapping is taken into account. Kuwabara's unit cell model is employed in modeling the suspension system, and a pseudospectral method based on Chebyshev polynomial is adopted to solve the resulting general electrokinetic equations. Key factors are examined such as the thickness of the electric double layer, the magnitude of the surface potential, the volume fraction of liquid drops, and the viscosity of the internal fluid. The results presented here add another dimension to the previous corresponding study of rigid particles by considering the internal flow of liquid drops, characterized by their viscosity. It is found, among other things, that the lower the viscosity of the internal fluid, the greater the diffusiophoretic velocity of liquid drops. In particular, the diffusiophoretic velocity of an invicid drop is about 3 times higher than that of a rigid one, whereas it is about 2 times higher for a liquid drop with a viscosity similar to that of the suspending medium. The surfactant that might be absorbed on the droplet surface is crucial to the overall observations made above, though.

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Self-organization of growing and decaying particles

Cited by 19 publications

References 13 publications

Self-Propulsion of Nematic Drops: Novel Phase Separation Dynamics in Impurity-Doped Nematogens

Self-Propulsion of Nematic Drops: Novel Phase Separation Dynamics in Impurity-Doped Nematogens

Experimental Evidence of the Motion of a Single Out-of-Equilibrium Drop

Diffusiophoresis of Concentrated Suspensions of Liquid Drops

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