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Studying the porosity of graphite foil with different densities: pore space model and gas permeability

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Abstract

The study is aimed to deepen the understanding of the interrelation between density, open and closed porosity as well as gas permeability of compressed graphite foils with a density ranging from 0.5 to 1.8 g·cm−3 designed especially for sealing applications. The pore structure of the graphite foil samples is experimentally measured by several complementary methods: low-temperature N2 adsorption, method of saturation with liquids (hydrostatic weighting), mercury porosimetry, and helium leak detection for gas permeability measurement. A comparative study of the porosity obtained by mercury porosimetry and by saturation with water and isopropanol, made it possible to propose a reliable express method for determining and controlling the porosity of dense graphite foil. It was found that the characteristic pore size and open porosity of graphite foil decreases with increasing its density from 0.5 to 1.8 g·cm−3 leading to a decrease in helium gas permeability of the foils. An average capillary diameter, the number of capillaries and their effective cross-sectional area was calculated on the basis of the dependence of helium gas permeability on foil density and gas pressure. The obtained data were applied for describing the pore structure of the graphite foils with low density and explanation of their low gas permeability.

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Acknowledgements

The work was carried out within the framework of the state program of world-class scientific and educational centers (assignment number FEWG-2021-0014) for the youth laboratory on the research direction “Studying gas permeability and physicochemical properties of sealing composite and carbon materials.”

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Authors and Affiliations

  1. Department of Chemistry, Moscow State University, 119899, Moscow, Russia

    A. L. Yurkov, A. P. Malakho, A. V. Ivanov & V. V. Avdeev

  2. Tula State University, pr. Lenina 92, Tula, 300012, Russia

    A. L. Yurkov, A. P. Malakho & E. A. Chernova

  3. Department of Materials Science, Moscow State University, 119992, Moscow, Russia

    E. A. Chernova

  4. Moscow Engineering Physics Institute Molecular Physics Department, National Research Nuclear University MEPhI Moscow, Kashirskoe Highway, 31, 115409, Moscow, Russia

    A. A. Belogorlov

Authors
  1. A. L. Yurkov
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  2. A. P. Malakho
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  3. A. V. Ivanov
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  4. E. A. Chernova
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  5. A. A. Belogorlov
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  6. V. V. Avdeev
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Correspondence to A. P. Malakho or E. A. Chernova.

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Yurkov, A.L., Malakho, A.P., Ivanov, A.V. et al. Studying the porosity of graphite foil with different densities: pore space model and gas permeability. J Mater Sci 57, 21156–21171 (2022). https://doi.org/10.1007/s10853-022-07677-9

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  • DOI: https://doi.org/10.1007/s10853-022-07677-9

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