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Using the Isopiestic Method to Study Hygroscopic Properties of Soluble Solutes

  • Anatoly G. TereshchenkoEmail author
Article
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Abstract

Hygroscopic properties of a soluble crystalline solid are determined by the water activity of the saturated solution that is present on the crystal surface of the substance. If the substance contains impurities, then they are also found in the saturated solution and affect the solution’s water activity and, consequently, the hygroscopic properties of the substance. The isopiestic method is used to determine water activities of solutions and, thus, is a universal and accurate technique for examining the hygroscopic properties of substances. This review paper considers the specific requirements for the isopiestic method when used to study the hygroscopicity of substances. Additionally, it provides recommendations with regard to the device and appropriate methods for the processing and presentation of research results. The effect of heterogeneous soluble impurities on the hygroscopic properties of solids was studied. It is demonstrated that isopiestic investigations of concentrated and saturated solutions can be applied to study the hygroscopic properties of pure solids, and to evaluate the effect of impurities on the hygroscopic properties of substances.

Keywords

Water vapor sorption Hygroscopic properties Effect of impurities Isopiestic method 

Notes

Acknowledgements

The author expresses gratitude to T.A. Fateeva (National Research Tomsk Polytechnic University) for the provided figures, and O.S. Kvashnina (National Research Tomsk Polytechnic University) for the English language support. The research was carried out at Tomsk Polytechnic University within the framework of Tomsk Polytechnic University Competitiveness Enhancement Program Grant, Project Number TPU CEP_IHTP_73\2017.

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Authors and Affiliations

  1. 1.National Research Tomsk Polytechnic University (TPU)TomskRussia

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