Tracer diffusion in polyatomic liquids. II

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Abstract
Tracer diffusion measurements taken over a wide range of temperature (25.0–142.7° C) are reported for nine solutes (Ar, CH4, Kr, Xe, R4 Sn: R = Me, Et, n-Pr, n-Bu) in cyclohexane. The measurements were made in a Taylor dispersion apparatus modified for pressurization and temperature control. Rough-hard-sphere theory, in which the diffusion coefficient is the product of a constant rotational factor, Enskog’s diffusivity of hard spheres, and a computer-generated backscattering coefficient, agrees well with the observed results. The theory furnishes new insights into the origins of the energy of activation of diffusion and explains trends not previously understood.

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