Fluidity of bound hydration layers

Uri Raviv, Jacob Klein*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

535 Scopus citations


We have measured the shear forces between solid surfaces sliding past each other across aqueous salt solutions, at pressures and concentrations typical of naturally occurring systems. In such systems the surface-attached hydration layers keep the compressed surfaces apart as a result of strongly repulsive hydration forces. We find, however, that the bound water molecules retain a shear fluidity characteristic of the bulk liquid, even when compressed down to films 1.0 ± 0.3 nanometer thick. We attribute this to the ready exchange (as opposed to loss) of water molecules within the hydration layers as they rub past each other under strong compression.

Original languageAmerican English
Pages (from-to)1540-1543
Number of pages4
Issue number5586
StatePublished - 30 Aug 2002
Externally publishedYes


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