Quantum Effect in the Diffusion of Gases in Liquids at 25°C

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Abstract
The study of the diffusion of gas solutes in CCl4 by Ross and Hildebrand is extended and refined to give the following figures for 105D in square centimeters per second at 25°C: in CCl4: He, ∼20; Ne, ∼6.3 (subject to determination of solubility) ; O2, 3.8; SF6, 1.7. In (C4F9)3N; He, ∼13; H2, 6.5; D2, 5.55; Ne, ∼5.3; N2, 2.35; Ar, 2.75. The method is shown to yield not merely relative but absolute values of diffusivity. The product 1021Dσ2, where σ is the molecular diameter, rises in CCl4 from 45 for the heavier gases to 132 for He; in (C4F9)3N from 32 to 86 for He. There is a linear relation between these values and the square of the quantum parameters of de Boer. The quantum effect is much stronger in CCl4 than in (C4F9)3N in accord with their internal pressures, 3350 and 2170 atm, respectively.

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