Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 14, Issue 5, Pages 1301-1309Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c033001301J
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In this study, density functional theory-based MD simulations and SFG spectroscopy were used to investigate the response of water molecules on tunable hydrophilic interfaces. A microscopic metric was introduced to track the transition between hydrophobic and hydrophilic interfaces. This metric builds a bridge between molecular descriptors of hydrophilicity/hydrophobicity and spectroscopically measured quantities, providing a method to interpret experimental SFG signals quantitatively or qualitatively.
Uncovering microscopic hydrophilicity and hydrophobicity at heterogeneous aqueous interfaces is essential as it dictates physico/chemical properties such as wetting, the electrical double layer, and reactivity. Several molecular and spectroscopic descriptors were proposed, but a major limitation is the lack of connections between them. Here, we combine density functional theory-based MD simulations (DFT-MD) and SFG spectroscopy to explore how interfacial water responds in contact with self-assembled monolayers (SAM) of tunable hydrophilicity. We introduce a microscopic metric to track the transition from hydrophobic to hydrophilic interfaces. This metric combines the H/V descriptor, a structural descriptor based on the preferential orientation within the water network in the topmost binding interfacial layer (BIL) and spectroscopic fingerprints of H-bonded and dangling OH groups of water carried by BIL-resolved SFG spectra. This metric builds a bridge between molecular descriptors of hydrophilicity/hydrophobicity and spectroscopically measured quantities and provides a recipe to quantitatively or qualitatively interpret experimental SFG signals.
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