Thermodynamics of Formation of and Adsorption at Interfaces with a Floating Lens

Aratono, Makoto; Toyomasu, Takayuki; Ikeda, Norihiro; Takiue, Takanori

doi:10.1006/jcis.1999.6416

Cited by 12 publications

(11 citation statements)

References 27 publications

(36 reference statements)

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“…This is allowed when we assume that the oil molecules are insoluble in the aqueous phase . The calculated adsorbed amounts agree quite well with those of our model.…”

Section: Resultssupporting

confidence: 81%

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Fainerman¹,

Aksenenko

Makievski³

et al. 2019

Langmuir

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A two-component interfacial layer model was employed to describe the experimental results obtained for various surfactants. In contrast to the previous works, here it is shown that the adsorption activity of alkane depends on its interaction with the adsorbed surfactant and is proportional to the surface coverage by this surfactant. Also, it is assumed that this increase of the adsorption activity parameter is limited by some maximum value. This model provides a good description of the influence of hexane and dodecane, which results in the decrease of surface tension by 2−5 mN/m at very low surfactant concentrations. The adsorbed amounts of the surfactant and alkane molecules in this low surfactant concentration range have been calculated. The reorientation model of surfactant adsorption predicts a smaller number of alkane molecules per one surfactant molecule than that which follows from the Frumkin model.

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“…This is allowed when we assume that the oil molecules are insoluble in the aqueous phase . The calculated adsorbed amounts agree quite well with those of our model.…”

Section: Resultssupporting

confidence: 81%

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Fainerman¹,

Aksenenko

Makievski³

et al. 2019

Langmuir

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“…To analyze the interfacial tensions, we adopt the so-called “P convention” in which air, hexadecane, and water are chosen symmetrically as reference states and the four independent variables are chosen to be temperature T , pressure p , pressure within the oil lens p O , and molality of surfactant in the aqueous phase . (The additional degree of freedom arises from the curvature of the oil lens; the AW interface is assumed to be planar.)…”

Section: Resultsmentioning

confidence: 99%

“…These phenomena have attracted widespread attention because they have great practical value in fields such as oil recovery and are closely related to biological processes such as cell fusion. To understand these phenomena in more detail, we have adopted a suite of precise experimental techniques for studying interfaces in three-phase systems and we have developed a thermodynamic formalism that enables us to extract physical insights from the experimental results. ,, …”

Section: Introductionmentioning

confidence: 99%

Interfacial Films and Wetting Behavior of Hexadecane on Aqueous Solutions of Dodecyltrimethylammonium Bromide

et al. 2003

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The interfacial tensions and dihedral angles of hexadecane lenses on aqueous solutions of dodecyltrimethylammonium bromide (DTAB) were measured in air as a function of the molality of DTAB at 298.15 K and atmospheric pressure. The air/water interfacial tension of DTAB solution shows a break point that shifts to a lower concentration in the presence of a hexadecane lens. Ellipsometric measurements showed a continuous variation in ellipticity with concentration for pure DTAB solutions, but a discontinuous change in the ellipticity of the air/water interface in the presence of a hexadecane lens. This behavior can be viewed either as a first-order wetting transition driven by the adsorbed surfactant, or as a gaseousexpanded phase transition in the surfactant adsorbed film induced by the hexadecane. The formation of a microscopic oil film in equilibrium with a lens is rationalized by an attractive long-range potential across the thin film. From the measurement of dihedral angles, it was found that there was a concentration region where a lens exists stably even when complete wetting was expected from measured values of interfacial tensions.

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“…Of the few available studies that considered such systems, invariably the case of free drops has been considered, wherein the compound drops are entirely surrounded by the continuous phase fluid. 3,[14][15][16][17] In such a scenario, describing the geometry of equilibrium states becomes a comparatively simple solution of the Young-Laplace equation that accounts for the relative energies of the interfaces and drop volumes.…”

Section: Introductionmentioning

confidence: 99%

Compound sessile drops

et al. 2012

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Compound drops arise from the contact of three immiscible fluids and can assume various geometric forms based on the interfacial chemistry of the phases involved. Here we present a study of a new class of compound drops that is sessile on a solid surface. The possible geometries are demonstrated experimentally with appropriate fluid combinations and accounted for with a quantitative theoretical description. Although such systems are broadly controlled by relative interfacial energies, subtleties such as the van der Waals force and effects of micro-gravity, despite drop sizes being well below the capillary length, come into play in determining the equilibrium state that is achieved. The drying of a compound sessile drop was measured experimentally, and the process revealed a novel transition between different characteristic configurations of compound sessile drops. Such drops may prove to be useful as the first step towards development of functional surfaces in applications such as soft optics, photonics and surface encapsulation.

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Thermodynamics of Formation of and Adsorption at Interfaces with a Floating Lens

Cited by 12 publications

References 27 publications

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Particular Behavior of Surface Tension at the Interface between Aqueous Solution of Surfactant and Alkane

Interfacial Films and Wetting Behavior of Hexadecane on Aqueous Solutions of Dodecyltrimethylammonium Bromide

Compound sessile drops

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