The gibbs surface excess in binary miscibility gap systems

Nishioka, Gary M.; Lacy, L. L.; Facemire, B. R.

doi:10.1016/0021-9797(81)90176-4

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…This decrease is due to solute adsorption; hence, solute concentration at the surface is larger than in the bulk, leading to the hypothesis that phase segregation starts at the surface, at bulk concentrations below the saturation point. When studying the foam stability of organic solvents mixtures with partial miscibility, Nishioka et al 7 described adsorption as "a precursor to phase separation, with the surface offering a region for partial segregation of molecules prior to their more complete separation as a bulk phase". 7 Nishioka et al only referred to the enrichment process of the surface with solute, as other authors also have.…”

Section: Introductionmentioning

confidence: 99%

“…When studying the foam stability of organic solvents mixtures with partial miscibility, Nishioka et al 7 described adsorption as "a precursor to phase separation, with the surface offering a region for partial segregation of molecules prior to their more complete separation as a bulk phase". 7 Nishioka et al only referred to the enrichment process of the surface with solute, as other authors also have. 8−11 In the present work, the coexistence of two saturated surface phases lying in the liquid−air interfacial plane was investigated.…”

Section: Introductionmentioning

confidence: 99%

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Phase Segregation at the Liquid–Air Interface Prior to Liquid–Liquid Equilibrium

Bermúdez-Salguero

Gracia-Fadrique

2015

J. Phys. Chem. B

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Binary systems with partial miscibility segregate into two liquid phases when their overall composition lies within the interval defined by the saturation points; out of this interval, there is one single phase, either solvent-rich or solute-rich. In most systems, in the one-phase regions, surface tension decreases with increasing solute concentration due to solute adsorption at the liquid-air interface. Therefore, the solute concentration at the surface is higher than in the bulk, leading to the hypothesis that phase segregation starts at the liquid-air interface with the formation of two surface phases, before the liquid-liquid equilibrium. This phenomenon is called surface segregation and is a step toward understanding liquid segregation at a molecular level and detailing the constitution of fluid interfaces. Surface segregation of aqueous binary systems of alkyl acetates with partial miscibility was theoretically demonstrated by means of a thermodynamic stability test based on energy minimization. Experimentally, the coexistence of two surface regions was verified through Brewster's angle microscopy. The observations were further interpreted with the aid of molecular dynamics simulations, which show the diffusion of the acetates from the bulk toward the liquid-air interface, where acetates aggregate into acetate-rich domains.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%