Picosecond self-diffusion in ethanol-water mixtures

Tilo Seydel, Robert M. Edkins, Katharina Edkins

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Abstract

We report the self-diffusion in ethanol-water mixtures as a function of the water-ethanol ratio measured at different temperatures using quasi-elastic neutron spectroscopy (QENS). For our protiated samples, QENS is mainly sensitive to the dominant ensemble averaged incoherent scattering from the hydrogen atoms of the liquid mixtures. The energy range and resolution render our experiment sensitive to the picosecond time scale and nanometer length scale. These observation scales complement different scales accessible by nuclear magnetic resonance techniques. Subsequent to testing different models, we find that a simple jump diffusion model averaging over both types of molecules, water and ethanol, best fits our data.
Original languageEnglish
Pages (from-to)9547-9552
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume21
Issue number18
Early online date16 Apr 2019
DOIs
Publication statusPublished - 16 Apr 2019

Keywords

  • quasi-elastic neutron scattering (QENS)
  • aqueous ethanol mixtures
  • ethanol
  • ethanol and water

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    Increased rate of solvent diffusion in a prototypical supramolecular gel measured on the picosecond timescale

    Seydel, T., Edkins, R. M., Jones, C. D., Foster, J. A., Bewley, R., Aguilar, J. A. & Edkins, K., 21 Jun 2018, Chemical Communications, 49, p. 6340-6343 4 p.

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