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- W4213305984 abstract "We explore the influence of salt addition on the structure of water interacting closely with a charged silica surface. Isolating these surface effects is challenging, even with surface-specific techniques like sum frequency generation (SFG), because of the presence of aligned water nanometers to microns away from the charged silica. Here we combine zeta potential and SFG intensity measurements with the maximum entropy method and reported heterodyne second harmonic and sum frequency generation results to deconvolute from the total signal intensity the SFG spectral contributions of the waters adjacent to the surface. Deconvolution reveals that at very low ionic strength the surface water structure is similar to that of a neutral silica surface near the point of zero charge with waters oriented in opposite directions. This result suggests the known metastability of silica near the PZC and the stability of silica in low ionic strength solutions may originate from the same source, these oppositely oriented surface-bound waters. Orientation changes are induced upon adding salt, which lead to a decrease in the total amount of aligned water at the surface." @default.
- W4213305984 created "2022-02-24" @default.
- W4213305984 creator A5062885782 @default.
- W4213305984 creator A5063832532 @default.
- W4213305984 date "2020-11-30" @default.
- W4213305984 modified "2023-10-16" @default.
- W4213305984 title "The Role of Ions on the Surface-Bound Water Structure at the Silica/Water Interface: Identifying the Spectral Signature of Stability" @default.
- W4213305984 doi "https://doi.org/10.26434/chemrxiv.13296587.v1" @default.
- W4213305984 hasPublicationYear "2020" @default.
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