Abstract
The Taylor dispersion technique has been used for measuring binary mutual diffusion coefficients for mixtures of 1,2,3,4-tetrahydronaphthalene (THN), isobutylbenzene (IBB) and dodecane (C12 H 26) at 0.5:0.5 mass fraction symmetric points, and for 0.9:0.1 mass fraction in IBB- C12 H 26. From the Stokes–Einstein equation and our experimental results, the limiting diffusion coefficients, D 0, and the equivalent solvated radii, R s, have been estimated at infinitesimal concentration of these species (TNH, IBB and C12 H 26). The measured diffusion coefficients are used to estimate activity coefficients of the components in the mixture, contributing to a better understanding of the structure of such systems and of their thermodynamic behaviour at different concentrations. We have also investigated the diffusion properties for a ternary system containing equal mass fractions of all the components (0.33THN: 0.33IBB: 0.33C12 H 26) and at 298.15 K.
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Acknowledgments
The authors are grateful for funding from the Coimbra Chemistry Centre, which is supported by the Fundação para a Ciência e a Tecnologia (FCT), Portuguese Agency for Scientific Research, through the programmes UID/QUI/UI0313/2013 and COMPETE. C.I.A.V.S. also thanks the FCT for support through Grant SFRH/BPD/92851/2013.
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This article belongs to the Topical Collection: Advances in Gravity-related Phenomena in Biological, Chemical and Physical Systems. Guest Editors: Valentina Shevtsova, Ruth Hemmersbach
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Santos, C.I.A.V., Shevtsova, V., Burrows, H.D. et al. Optimization of Taylor Dispersion Technique for Measurement of Mutual Diffusion in Benchmark Mixtures. Microgravity Sci. Technol. 28, 459–465 (2016). https://doi.org/10.1007/s12217-016-9498-5
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DOI: https://doi.org/10.1007/s12217-016-9498-5