Abstract
In a recent paper we made a calculation of the interfacial tension σ in a binary liquid solution. This involved consideration of the effects of composition gradient, and involved a characteristic length δz giving the distance up or down the gradient over which a molecule was influenced by its neighbors. An equation was derived which related σ to δz, the coexistence curve, properties of the critical point, and the thickness Δz of the interface. This equation has now been applied to3He-4He solutions, and its relation to scaling laws for the tricritical exponents has been discussed. This requires estimates of effective values of the tricritical exponents in the temperature range actually used from measurements in the literature of σ and other quantities, and from an estimate of δz from the de Broglie wavelength, Δz has been estimated to be about 80Å at0.022 deg below the critical temperature. This has been compared to an estimate of the correlation length.
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Supported by the National Science Foundation.
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Rice, O.K. Interfacial tension near the tricritical point of3He-4He solutions. J Low Temp Phys 29, 269–273 (1977). https://doi.org/10.1007/BF00655094
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DOI: https://doi.org/10.1007/BF00655094