2020
DOI: 10.1039/d0cp03207g
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A hydrogen-bonding structure in self-formed nanodroplets of water adsorbed on amorphous silica revealed via surface-selective vibrational spectroscopy

Abstract: Water adsorption onto materials surface is known to change macroscopic surface properties such as wettability and friction coefficient. While the role of the adsorbed water has been discussed for a...

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Cited by 19 publications
(30 citation statements)
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References 33 publications
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“…63 Yet we caution that inferring the number density of water molecules contributing to each mode is difficult as we do not know the hyperpolarizability magnitudes or the orientation distribution of the different water populations, which adds to the complexity in interpreting these Stern layer spectra. 58,73 The positively signed 3600 cm -1 peak, which was observed in the intensity spectra and previously assigned to either isolated silanol groups [66][67] or dangling water molecules over hydrophobic sites, [68][69] is present in the Stern layer spectra and remains positively signed over the entire titration (Fig. 3c).…”
Section: 𝑑𝑧supporting
confidence: 56%
See 1 more Smart Citation
“…63 Yet we caution that inferring the number density of water molecules contributing to each mode is difficult as we do not know the hyperpolarizability magnitudes or the orientation distribution of the different water populations, which adds to the complexity in interpreting these Stern layer spectra. 58,73 The positively signed 3600 cm -1 peak, which was observed in the intensity spectra and previously assigned to either isolated silanol groups [66][67] or dangling water molecules over hydrophobic sites, [68][69] is present in the Stern layer spectra and remains positively signed over the entire titration (Fig. 3c).…”
Section: 𝑑𝑧supporting
confidence: 56%
“…These features arise from ordered and polarized interfacial water in the electrical double layer as described above, 42 although there is debate whether the 3600 cm -1 mode originates from isolated silanols [66][67] or water molecules dangling over hydrophobic silica sites. [68][69] At pH 10, the integrated SF intensity, which approximates the amount of net ordered and polarized water in the entire electrical double layer, is the largest (Fig. 1b).…”
Section: 𝑑𝑧mentioning
confidence: 99%
“…The positively signed 3600 cm -1 peak, which was observed in the intensity spectra and previously assigned to either isolated silanol groups [57][58] or dangling water molecules over hydrophobic sites, [59][60] is present in the Stern layer spectra and remains positively signed over the entire titration (Fig. 3c).…”
Section: How Water Dipole Populations In the Stern And Diffuse Layer ...supporting
confidence: 57%
“…These features arise from ordered and polarized interfacial water in the electrical double layer as described above, 34 although there is debate whether the 3600 cm -1 mode originates from isolated silanols [57][58] or water molecules dangling over hydrophobic silica sites. [59][60] At pH 10, the integrated SF intensity, which approximates the amount of net ordered and polarized water in the entire electrical double layer, is the largest (Fig. 1b).…”
Section: Resultsmentioning
confidence: 99%
“…As such, this work provides a general route to decipher the surface water structure under a variety of experimental conditions. Therefore, where previous attempts to measure the spectrum of surface waters on silica have modified the system through the addition of salt or other means to completely suppress the diffuse layer contribution, ,, our work allows their relative contributions to be disentangled when both are present.…”
mentioning
confidence: 99%