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Thermodynamic properties of fluids confined in nanopores differ from thoseobserved in the bulk. To investigate the effect of nanoconfinement on watercompressibility, we performed water sorption experiments on two nanoporousglass samples while concomitantly measuring the speed of longitudinal and shearultrasonic waves in these samples. These measurements yield the longitudinaland shear moduli of the water laden nanoporous glass as a function of relativehumidity that we utilized in the Gassmann theory to infer the bulk modulus ofthe confined water. This analysis shows that the bulk modulus (inverse ofcompressibility) of confined water is noticeably higher than that of the bulkwater at the same temperature. Moreover, the modulus exhibits a lineardependence on the Laplace pressure. The results for water, which is a polarfluid, agree with previous experimental and numerical data reported fornon-polar fluids. This similarity suggests that irrespective of intermolecularforces, confined fluids are stiffer than bulk fluids. Accounting for fluidstiffening in nanopores may be important for accurate interpretation of wavepropagation measurements in fluid-filled nanoporous media, including inpetrophysics, catalysis, and other applications, such as in porous materialscharacterization.

Ultrasonic Study of Water Adsorbed in Nanoporous Glasses