Skip to main content
Log in

Effect of Water Saturation on the Electrical Conductivity of Microporous Silica Glass

  • Published:
Transport in Porous Media Aims and scope Submit manuscript

Abstract

The electrical conductivity of porous dielectric materials saturated with water is usually determined by the bulk water conduction. However, the unsaturated state can be affected by a water film covering the unsaturated grain surface. Thus far, a few studies have been conducted on the study of the electrical conductivity with respect to water film covering the grain surface. In this study, the electrical conductivities of the Shirasu porous glass with three different uniform pore sizes (1.0, 0.5, and 0.2 \(\upmu \mathrm{m}\)) soaked in various NaCl solutions (0.001, 0.01, and 0.1 \(\mathrm{mol} {\mathrm{L}}^{-1}\)) were measured using an impedance meter while being dried at different water saturations. The resulting complex conductivities were fitted by a three-component Cole–Cole model to obtain Cole–Cole parameters. The conductivity values in these parameters were compared with the calculated conductivity values using tortuosities of surface and bulk conduction obtained from two different circuit models. The parallel model of bulk and surface water conduction could not reproduce accurate experimental results; however, the parallel plus series model, including the series connection of water film and bulk water around the meniscus, produced better results. This new model is expected to provide an improved quantitative evaluation of the electrical conductivity of unsaturated porous materials.

Article Highlights

  • Electrical conductivity of the Shirasu porous glass at different water saturations was measured.

  • The relationship between tortuosity of bulk and surface, and water saturation was obtained.

  • A new model was proposed for explaining experimental results.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8

Similar content being viewed by others

References

Download references

Acknowledgements

RU was supported by a Research Assistantship from the Graduate School of Science, Osaka University. We would like to thank Editage for English language editing. RU thanks Shogo Komori for valuable discussion. RU also thanks Toshiyuki Yokota for his support. Finally, we would like to thank two anonymous reviewers for their helpful reviews.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Ryosuke Umezawa.

Ethics declarations

Conflict of interest

The authors declare that they have no conflict of interest.

Availability of data and material

The datasets used and/or analyzed during the current study are available from the corresponding author on request.

Additional information

Publisher's Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Umezawa, R., Katsura, M. & Nakashima, S. Effect of Water Saturation on the Electrical Conductivity of Microporous Silica Glass. Transp Porous Med 138, 225–243 (2021). https://doi.org/10.1007/s11242-021-01601-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s11242-021-01601-6

Keywords

Navigation