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Measuring the Densities of Aqueous Glasses at Cryogenic Temperatures
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Chemical Purity by Dielectric Cryometry.

Gaylon S Ross, Lois J Frolen

    Journal of Research of the National Bureau of Standards. Section A, Physics and Chemistry
    |October 4, 2019
    PubMed
    Summary

    This study introduces a novel cryometric purity determination method using dielectric constant measurements. This approach offers high precision and wide applicability for various organic compounds.

    Area of Science:

    • Physical Chemistry
    • Analytical Chemistry

    Background:

    • Standard cryometric purity determination methods have limitations.
    • An intensive property measurement offers a more precise approach.

    Purpose of the Study:

    • To develop a new method for precise purity determination.
    • To assess the applicability of dielectric constant measurements for purity analysis.

    Main Methods:

    • Measuring dielectric constant as a function of fraction melted.
    • Correlating dielectric constant changes with temperature variations.
    • Testing the method on organic compounds with diverse properties.

    Main Results:

    • The dielectric constant method allows high-precision purity calculation.

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  • The method demonstrated wide applicability across various organic compounds.
  • A significant dielectric constant change with minimal temperature shift was observed for high-purity compounds.

    • Conclusions:

    • The dielectric constant method overcomes limitations of traditional cryometric techniques.
    • This method is suitable for a broad range of organic compounds.
    • Potential for automated temperature control in purity analysis was identified.