A hydrogen-bonding structure in self-formed nanodroplets of water adsorbed on amorphous silica revealed: Via surface-selective vibrational spectroscopy

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Water adsorption onto a material 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 long time, the interfacial structure of the adsorbed water has not been fully recognized in many cases. In this study, the hydration structure of water adsorbed on a vapor/silica interface at room temperature was studied via heterodyne-detected vibrational sum-frequency generation spectroscopy. The vibrational spectra of the interfacial molecules obtained here were different from those estimated via conventional sum-frequency generation spectroscopy. Interestingly, our results suggest that, at low humidity, the adsorbed water on silica forms nanodroplets instead of a uniform film. Because no silanol group was found to be hydrogen-bonding free, it was concluded that water molecules gather around the silanol group to form strongly hydrogen-bonded droplets. At high humidity, while the adsorbed water partially behaves like a bulk liquid, deprotonation of the silanol was not observed, unlike the case of silica surfaces in contact with bulk liquid water.

本文言語English
ページ(範囲)27031-27036
ページ数6
ジャーナルPhysical Chemistry Chemical Physics
22
46
DOI
出版ステータスPublished - 14 12月 2020

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