Definition
The hydration force is a strong short-range repulsive force that acts between polar surfaces separated by a thin layer (<3 nm) of water (or some other polar solvents, when it is referred to as a solvation force), which decays quasi-exponentially with the surfaces’ spacing.
P 0 is the force amplitude, H is the surfaces spacing, and λ is the decay length. The hydration force has been observed in a wide variety of colloid and biological systems and determines the behavior of many diverse systems, such as the stability of colloidal dispersions and soap films, the swelling of clays, and the interactions of biological membranes and macromolecules. In addition, the hydration force does not obey the predictions of the Derjaguim-Landau-Verwey-Overbeek (DLVO) theory, which predicts the approach to van der Waals adhesion when the surfaces are close enough.
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Zhang, C. (2013). Hydration Force. In: Wang, Q.J., Chung, YW. (eds) Encyclopedia of Tribology. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-92897-5_466
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DOI: https://doi.org/10.1007/978-0-387-92897-5_466
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