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Surface tension
About: Surface tension is a research topic. Over the lifetime, 25410 publications have been published within this topic receiving 695471 citations.
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TL;DR: In this paper, a series of old and new equilibrium tension models are reviewed and evaluated for single premicellar ionic surfactants at the air-water interface with or without added salt with a common ion.
328 citations
15 Mar 1989
TL;DR: In this paper, the existence of negative interfacial tension at liquid/liquid interfaces was shown to be a real phenomenon between monopolar surfaces (i.e., surfaces with mainly H-acceptor properties) and polar liquids.
Abstract: In a previous paper it was shown that negative interfacial tensions between predominantly monopolar surfaces (i.e., surfaces with mainly H-acceptor properties) and polar liquids are real phenomena. Such negative interfacial tensions do however decay rapidly. For miscible liquids, the decay of the interface is, in general, so rapid that it practically excludes measurement of interfacial tension. However, if one liquid is present in the form of a gel, and if the other liquid is placed as a drop upon the gel, there is often enough time to measure contact angles. This may be done at various concentrations of the liquid encased in the gel, and an extrapolation made to zero concentration of the gelling agent. With this method we found the existence of negative interfacial tensions at liquid/liquid interfaces.
328 citations
TL;DR: In this article, the effect of the ionic liquid forming anion and cation on the physical properties is analyzed systematically and the density, viscosity, and surface tension data sets of 13 ionic liquids formed by imidazolium, pyrinium, or pyrrolidinium cations paired with dicyanamide (DCA−), tetrafluoroborate (BF4−), thiocyanate (SCN−), methylsulfate (MeSO4−) anions are reported.
Abstract: Density, viscosity, and surface tension data sets of 13 ionic liquids formed by imidazolium, pyridinium, or pyrrolidinium cations paired with dicyanamide (DCA−), tetrafluoroborate (BF4−), thiocyanate (SCN−), methylsulfate (MeSO4−), and trifluoroacetate (TFA−) anions are reported. The properties were measured at temperatures between (293 and 363) K. The effect of the ionic liquid forming anion and cation on the physical properties is analyzed systematically. As expected, the measured density, viscosity, and surface tension of the studied ionic liquids decreased with an increment in temperature. The density measurements were linearly correlated as a function of temperature, and the viscosities were fitted to a Vogel−Fulcher−Tamman equation. The density and surface tension data were used to estimate expansivity coefficients and surface thermodynamic properties of the ionic liquids. The physical properties are determined by the nature, size, and possible interactions of the ions forming the liquid. In general...
327 citations
TL;DR: It was shown that, for the former three amino acids, known to have a positive surface tension increment, their perturbation of the surface free energy of water is consistent with their preferential exclusion from the protein surface.
327 citations
TL;DR: In this article, the effect of weak solute−solvent attractions on the solvation of nonpolar molecules in water at ambient conditions using an extension and improved parameterization of the theory of solvation due to Lum, Chandler, and Weeks was studied.
Abstract: We have studied the effect of weak solute−solvent attractions on the solvation of nonpolar molecules in water at ambient conditions using an extension and improved parameterization of the theory of solvation due to Lum, Chandler, and Weeks [J. Phys. Chem. B 1999, 103, 4570]. With a reasonable strength of alkane−water interactions, an accurate prediction of the alkane−water interfacial tension is obtained. As previously established for solutes with no attractive interactions with water, the free energy of solvation scales with volume for small solutes and with surface area for large solutes. The crossover to the latter regime occurs on a molecular length scale. It is associated with the formation of a liquid−vaporlike interface, a drying interface, between the large hydrophobic solute and liquid water. In the absence of attractions, this interface typically lies more than one solvent molecular diameter away from the hard sphere surface. With the addition of attractive interactions between water and the har...
327 citations