PMID: 22587097May 17, 2012Paper

Dynamics of confined water reconstructed from inelastic x-ray scattering measurements of bulk response functions

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
Robert H CoridanGerard C L Wong

Abstract

Nanoconfined water and surface-structured water impacts a broad range of fields. For water confined between hydrophilic surfaces, measurements and simulations have shown conflicting results ranging from "liquidlike" to "solidlike" behavior, from bulklike water viscosity to viscosity orders of magnitude higher. Here, we investigate how a homogeneous fluid behaves under nanoconfinement using its bulk response function: The Green's function of water extracted from a library of S(q,ω) inelastic x-ray scattering data is used to make femtosecond movies of nanoconfined water. Between two confining surfaces, the structure undergoes drastic changes as a function of surface separation. For surface separations of ≈9 Å, although the surface-associated hydration layers are highly deformed, they are separated by a layer of bulklike water. For separations of ≈6 Å, the two surface-associated hydration layers are forced to reconstruct into a single layer that modulates between localized "frozen' and delocalized "melted" structures due to interference of density fields. These results potentially reconcile recent conflicting experiments. Importantly, we find a different delocalized wetting regime for nanoconfined water between surfaces with high ...Continue Reading

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Citations

Feb 13, 2014·The Review of Scientific Instruments·M LippmannO H Seeck
Dec 10, 2013·Physical Review Letters·P Boynton, M Di Ventra
Dec 12, 2012·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Allison N Dickey, Mark J Stevens

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