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Thermal diffusion forced Rayleigh scattering setup optimized for aqueous mixtures.

Simone Wiegand1, Hui Ning, Hartmut Kriegs

  • 1Forschungszentrum Jülich GmbH, IFF-Weiche Materie, D-52428 Jülich, Germany. s.wiegand@fz-juelich.de

The Journal of Physical Chemistry. B
|December 7, 2007
PubMed
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A new infrared thermal diffusion setup avoids dyes for aqueous mixtures, enabling accurate thermal diffusion studies. This method is validated for water/ethanol and organic mixtures, offering reliable Soret coefficient measurements.

Area of Science:

  • Physical Chemistry
  • Thermodynamics
  • Transport Phenomena

Background:

  • Dye addition in thermal diffusion studies can introduce artifacts, particularly in complex aqueous systems like surfactants.
  • Accurate measurement of thermal diffusion is crucial for understanding transport phenomena in various mixtures.

Purpose of the Study:

  • To develop and validate an infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS) setup for studying thermal diffusion in aqueous and organic mixtures.
  • To eliminate the need for dye additives in aqueous systems, preventing potential experimental artifacts.

Main Methods:

  • Utilized a thermal diffusion forced Rayleigh scattering (TDFRS) setup operating at a 980 nm writing wavelength, leveraging water's natural absorption.
  • Validated the IR-TDFRS setup using water/ethanol mixtures (0.5-0.95 weight fraction) across 15-35°C.

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  • Investigated binary mixtures of dodecane, isobutylbenzene, and 1,2,3,4-tetrahydronaphthalene at 25°C.

    • Main Results:

    • The IR-TDFRS setup demonstrated excellent agreement with literature data for water/ethanol mixtures.
    • The setup accurately measured Soret coefficients for organic binary mixtures, showing good agreement with benchmark data.
    • Successfully performed measurements on aqueous systems without the addition of any dye.

    Conclusions:

    • The developed IR-TDFRS setup is effective for investigating thermal diffusion in both aqueous and organic mixtures.
    • The avoidance of dye additives in aqueous systems enhances the reliability of thermal diffusion measurements.
    • This technique provides a valuable tool for studying complex fluid behavior and transport properties.