Wetting layers caused by surface ionization in a near-critical binary liquid mixture

Ripple, Dean C.; Wu, Xiao-Lun; Franck, Carl

doi:10.1103/physrevb.38.9054

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…5 (1 cr). The optical modeling of dielectric media used to interpret the ellipsometric results will break down for layer thicknesses of a few molecular spacings or less [3,28] Rather than assume a slab profile of the refractive index through the wetting layer, we use the more realistic profiles of Sec. IV to obtain P(z).…”

Section: Theory Of Measurementsmentioning

confidence: 99%

“…[3] for a detailed discussion of the appropriate amplitude ratios and notation, and we give here only the final results. For the coeKcient of the gradient term, we find m = ma~t~" , with i)v=0.…”

Section: Theory Of Adsorptionmentioning

confidence: 99%

“…[6] ). A previous paper [3] demonstrates how to determine f, from a universal scaling function and how two-scale universality determines all of the relevant thermodynamic parameters given experimental amplitudes of only two critically diverging quantities. Heady and Cahn [20] actually measured three critical amplitudes for the system PFMC and MC: surface tension, the coexistence curve, and the curvature of the free energy, which is proportional to f, .…”

Section: Theory Of Adsorptionmentioning

confidence: 99%

“…Dispersion forces [1,2], electrostatic forces [3,4], capillary waves [5], and the proximity of the liquid-liquid critical point [6] may all contribute to the adsorption. Along the coexistence curve, bulk A-rich and B-rich phases are both allowed, and the substrate will be wet by a macroscopically thick layer of 2-rich liquid.…”

Section: Introductionmentioning

confidence: 99%

“…With the liquid in the two-phase re-gion, we drive the liquids out of equilibrium and off coexistence by linearly ramping the temperature of the liquid mixture while continuously stirring. The equilibrium method has been documented elsewhere [3,7], but the nonequilibrium method is newly developed and described fully in this paper. In steady state the rate at which the temperature ramp pushes the system off coexistence balances the relaxation of the volume fraction of A, tb, back to its equilibrium value.…”

Section: Introductionmentioning

confidence: 99%

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Nonequilibrium study of the forces responsible for adsorption in a binary liquid mixture

Ripple

Franck

1991

Phys. Rev. A

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A new nonequilibrium technique is used to investigate the intermolecular forces that determine the thickness of wetting layers in the system methylcyclohexane plus perfluoromethylcyclohexane on silicon near the critical point of the liquids. When the liquids are subjected to a linear temperature ramp, the resulting deviation from equilibrium controls the thickness of the methylcyclohexane-rich wetting layer. Ellipsometric measurements of the layer thickness for thermodynamic states corresponding to temperatures 0.5 to 50 mK above the coexistence curve agree quantitatively with theoretical calculations. As the distance from coexistence decreases, the layer thickness smoothly increases and shows a crossover from adsorption dominated by the nonzero correlation length to adsorption dominated by dispersion forces. The measurements also confirm that correlations in the concentration decay exponentially, out to at least five correlation lengths. Equilibrium measurements on an o6'-critical concentration cell in the single-phase region agree with theory for temperatures greater than 0.2 K from the coexistence curve, but show marked irreproducibility within 0.2 K of the transition. PACS number(s): 68.45.Gd, 68.15.+e, 66.10.Cb

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Section: Theory Of Measurementsmentioning

confidence: 99%

Section: Theory Of Adsorptionmentioning

confidence: 99%

Section: Theory Of Adsorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonequilibrium study of the forces responsible for adsorption in a binary liquid mixture

Ripple

Franck

1991

Phys. Rev. A

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Wetting, adsorption and surface critical phenomena

Law

2001

Progress in Surface Science

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Off-critical wetting layer divergence at the liquid/vapor interface of binary liquid mixtures

Williamson

Weatherford

DenBeste

et al. 2022

The Journal of Chemical Physics

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Surface wetting phenomena impact chemistry, physics, biology, and engineering. The wetting behaviors of partially-miscible binary liquid systems are especially complex. Here we report evidence of universal behavior in the divergence of wetting layer growth at liquid-vapor interfaces of the cyclohexane + aniline, hexane + o-toluidine, and methanol + carbon disulfide systems. Layer growth on the micron scale was followed using visible light scattering from stirred samples. Layer thicknesses diverged with decreasing temperature when coexistence was approached from the one-phase region, but only for solutions richer in the higher density / higher surface tension component. The onset of divergence was <1 K above the bulk coexistence temperature; nearer the critical composition, the onset temperature was the critical temperature itself. All three systems showed identical divergent wetting properties after variable normalization. In contrast, no divergent wetting layer formation was seen in the benzene + 1,2-propanediol or water + phenol systems. The mathematical sign of the Hamaker constant correlates with the contrasting behaviors. Collectively, these results have implications for theoretical descriptions of adsorption layer growth and crossover behavior, for measurements of complete wetting temperatures, and for practical applications.

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Wetting layers caused by surface ionization in a near-critical binary liquid mixture

Cited by 8 publications

References 24 publications

Nonequilibrium study of the forces responsible for adsorption in a binary liquid mixture

Nonequilibrium study of the forces responsible for adsorption in a binary liquid mixture

Wetting, adsorption and surface critical phenomena

Off-critical wetting layer divergence at the liquid/vapor interface of binary liquid mixtures

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