Molecular-Scale Density Oscillations in Water Adjacent to a Mica Surface
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- 24 September 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 87 (15) , 156103
- https://doi.org/10.1103/physrevlett.87.156103
Abstract
High-resolution specular x-ray reflectivity of the mica(001)-water interface under ambient conditions reveals oscillations in water oxygen density in the surface-normal direction, giving evidence of interfacial water ordering. The spacings between neighboring water layers in the near-surface, strongly oscillatory region are 2.5(2)–2.7(2) Å, approximately the size of the water molecule. The density oscillations extend to about 10 Å above the surface and do not strictly maintain a solvent-size periodicity as that in interfacial liquid metal and hard-sphere molecular liquids. We interpret this oscillatory density profile of the interfacial water as due to the “hard-wall” effect of the molecularly smooth mica surface.Keywords
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