On the Correlation of Tracer Diffusion Coefficients

Harris, Kenneth R.

doi:10.1021/je9600663

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…At x TBA ∼ 0.1 and x TBA ∼ 0.15 it is possible to fit D as a function of molar volume and temperature using an analogue of an equation used for self-diffusion , and tracer diffusion in nonaqueous molecular liquids, either unassociated such as n -hexane or H-bonded such as methanol. Details are given in Table and Appendix 1 .…”

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confidence: 99%

Diffusion and Structure in Water−Alcohol Mixtures: Water + tert-Butyl Alcohol (2-Methyl-2-Propanol)

Harris

Newitt

1999

J. Phys. Chem. A

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Data are reported for the intradiffusion coefficient of water (D w ) in aqueous solutions of 2-methyl-2-propanol (tert-butyl alcohol, TBA) as a function of pressure, temperature, and composition. In previous work (Harris and Newitt, J. Phys. Chem. B, 1998, 102, 8874), we have shown that for this system at mole fraction x TBA ∼ 0.025 and low temperatures, D w shows a maximum with increasing pressure to a greater relative extent than does the self-diffusion coefficient in pure water under the same conditions. It was concluded that this is consistent with the concept that the water is more structured in the TBA solution at this composition. Our present results confirm this at other concentrations below x TBA ∼ 0.06. This is also consistent with a previous, but unpublished, study of TBA intradiffusion by Woznyj, and the NMR relaxation and chemical shift results of Yoshida et al. (J. Chem. Phys., 1998, 108,1360. At higher concentrations, the normal behavior of a diminution of the diffusion coefficient with increasing pressure occurs. This is not consistent with ordering of hydration water suggested by certain models based on the presence of clathrate-like hydrates in solution.

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confidence: 99%

Diffusion and Structure in Water−Alcohol Mixtures: Water + tert-Butyl Alcohol (2-Methyl-2-Propanol)

Harris

Newitt

1999

J. Phys. Chem. A

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Quantification the diffusion-induced fractionation of 1H217O isotopologue in air accompanying the process of water evaporation

Pierchała

Różański

Duliński

et al. 2022

Geochimica et Cosmochimica Acta

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Modelling advection and diffusion of water isotopologues in leaves

Cuntz

Ogée²,

Farquhar

et al. 2007

Plant Cell & Environment

129

157

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We described advection and diffusion of water isotopologues in leaves in the non-steady state, applied specifically to amphistomatous leaves. This explains the isotopic enrichment of leaf water from the xylem to the mesophyll, and we showed how it relates to earlier models of leaf water enrichment in non-steady state. The effective length or tortuosity factor of isotopologue movement in leaves is unknown and, therefore, is a fitted parameter in the model. We compared the advection-diffusion model to previously published data sets for Lupinus angustifolius and Eucalyptus globulus. Night-time stomatal conductance was not measured in either data set and is therefore another fitted parameter. The model compared very well with the observations of bulk mesophyll water during the whole diel cycle. It compared well with the enrichment at the evaporative sites during the day but showed some deviations at night for E. globulus. It became clear from our analysis that night-time stomatal conductance should be measured in the future and that the temperature dependence of the tracer diffusivities should be accounted for. However, varying mesophyll water volume did not seem critical for obtaining a good prediction of leaf water enrichment, at least in our data sets. In addition, observations of single diurnal cycles do not seem to constrain the effective length that relates to the tortuosity of the water path in the mesophyll. Finally, we showed when simpler models of leaf water enrichment were suitable for applications of leaf water isotopes once weighted with the appropriate gas exchange flux. We showed that taking an unsuitable leaf water enrichment model could lead to large biases when cumulated over only 1 day.

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On the Correlation of Tracer Diffusion Coefficients

Cited by 3 publications

References 26 publications

Diffusion and Structure in Water−Alcohol Mixtures: Water + tert-Butyl Alcohol (2-Methyl-2-Propanol)

Diffusion and Structure in Water−Alcohol Mixtures: Water + tert-Butyl Alcohol (2-Methyl-2-Propanol)

Quantification the diffusion-induced fractionation of 1H217O isotopologue in air accompanying the process of water evaporation

Modelling advection and diffusion of water isotopologues in leaves

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