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Special Discussions of the Faraday Society Vol -1

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Bursting of soap films. Part 4.—The behaviour of ions on a crowded surface

Response of an equilibrium film to external disturbances

Aqueous foam films stabilized by a non-ionic surface-active agent

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Composition and energy relationships for some thin lipid films, and the chain conformation in monolayers at liquid-liquid interfaces

Interaction energy of emulsion droplets and the influence of adsorbed layers on it

Cohesive properties of thin films of liquids adhering to a solid surface

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Thermodynamic properties of thin films of some dipolar liquids adjacent to fused silica surfaces

Boundary viscosity of polydimethylsiloxane liquids and their binary mixtures

Boundary layers of pure liquids at the Graphon surface

Contact between a gas bubble and a solid surface and froth flotation

Interfacial energies of clean mica and of monomolecular films of fatty acids deposited on mica, in aqueous and non-aqueous media

General discussion ( Special Discussions of the Faraday Society Vol -1 )

Measurement of forces between colloidal particles

Boundary layers between silver iodide and aqueous solutions at low temperatures

Boundary layer near the surface of a solid body and low-frequency dielectric dispersion

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Nuclear magnetic resonance studies of water in disperse systems

Interlayer water in vermiculite: thermodynamic properties, packing density, nuclear pulse resonance, and infra-red absorption

Neutron scattering studies of hydrated layer silicates

General discussion ( Special Discussions of the Faraday Society Vol -1 )

Measurement of viscosity of liquids in quartz capillaries

Preliminary studies of thick surface films

Thickness of very thin films in elastohydrodynamic lubrication

Mechanical properties of very thin surface films

Smectic model for liquid films on solid surfaces. Part 1.—Application to monolayer boundary lubrication

General discussion ( Special Discussions of the Faraday Society Vol -1 )

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Interfacial energies of clean mica and of monomolecular films of fatty acids deposited on mica, in aqueous and non-aqueous media

Content Provider	Royal Society of Chemistry (RSC)
Author	Kay, Susan M. Price, Andrea G. Bailey, Anita I.
Copyright Year	1970
Abstract	The influence of a variety of media on solid/fluid interfacial energies has been measured by a cleavage technique. The solid used was mica, chosen because of its near perfect cleavage and ideal bulk properties. Solid/vapour and solid/liquid interfacial energies, γSV and γSL, were measured by cleaving specimens in the form of strips, first, in an atmosphere of the vapour and then with the specimens completely immersed in the corresponding liquid. Samples of mica coated with monomolecular films of fatty acids were constructed in such a way that separation took place between the oppositely oriented films. Polar and non-polar liquids and vapours were used in these experiments. The results allow an investigation into the validity of Young's equation for contact angles which are zero or positive. For well-behaved systems in which no adsorption takes place during the cleavage, the relation is valid. For fatty acid films in an aqueous environment, it is necessary to introduce an additional term into the relation to preserve the equality, thus γSL=γSV–γLV cos θ+γH·. The energy γH has been associated with entropic effects occurring in the liquid phase. Its existence shows that there are measurable anisotropies in the water. The results can be explained if a single layer of the water in the immediate vicinity of the hydrophobic interface, is assumed to become preferentially oriented.Model-building experiments have been used to estimate the number of water molecules involved in the interaction and a value of 213 cal/mol of oriented water was obtained for the energy involved. This allows one to predict values for the free energy of solution of small hydrophobic molecules in water, which are in good agreement with those of Frank and Evans. The effect disappears in a concentrated solution of urea indicating that the structure of the liquid near the interface is, in this case, effectively the same as it is in bulk, i.e., the urea has caused a breakdown in the ordered structure in the neighbourhood of the interface. This is consistent with current views of the denaturant action of urea on proteins and other bimolecules.
Starting Page	118
Ending Page	127
Page Count	10
File Format	PDF
ISSN	03709302
Volume Number	1
Journal	Special Discussions of the Faraday Society
DOI	10.1039/SD9700100118
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Urea Adsorption Anisotropy Evans Fatty acid Godfrey Evans Denatured alcohol Hydrophobe Frank Mica Thermodynamic free energy
Content Type	Text
Resource Type	Article

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Effect of Energy Deficiency during Late Pregnancy in Chios Ewes on Free Fatty Acids, b-Hydroxybutyrate and Urea Metabolites

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Ellipsometric and gas-volumetric investigation of adsorption reactions on clean silicon and germanium

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Interfacial energies of clean mica and of monomolecular films of fatty acids deposited on mica, in aqueous and non-aqueous media

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