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By monitoring the thermal noise of a vertically oriented micromechanical force sensor, we detect the viscoelastic response to shear for water in a subnanometer confinement. Measurements in pure water as well as under acidic and high-ionic-strength conditions relate this response to the effect of surface-adsorbed cations, which, because of their hydration, act as pinning centers restricting the mobility of the confined water molecules.
Bibliographical notePublisher: American Chemical Society
Ulcinas, A., Valdre, G., Snitka, V., Miles, M. J., Claesson, PM., & Antognozzi, M. (2011). Shear Response of Nanoconfined Water on Muscovite Mica: Role of Cations. Langmuir, 27(17), 10351 - 10355. https://doi.org/10.1021/la2021897