Fluid transport in partially filled porous sol-gel silica glass

Franco D'Orazio*, Sankar Bhattacharja, William P. Halperin, Rosario Gerhardt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Measurements of low-frequency ac electrical conductivity of a porous glass filled with different amounts of a saline solution are compared with the self-diffusion coefficient of water measured in the same sample, reported previously [F. DOrazio et al., Phys. Rev. Lett. 63, 43 (1989)]. The two transport parameters are consistently related through the Einstein relation under saturation conditions. A more complex picture is revealed for the unsaturated sample, since the presence of a vapor phase enhances the self-diffusion coefficient. Conductivity experiments allow an independent assessment of the contribution to self-diffusion from the liquid phase. However, a comparison between the two experiments indicates that the role of the vapor phase is not well understood.

Original languageEnglish (US)
Pages (from-to)6503-6508
Number of pages6
JournalPhysical Review B
Issue number10
StatePublished - 1990

ASJC Scopus subject areas

  • Condensed Matter Physics


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