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• W4296554328 endingPage "8683" @default.
• W4296554328 startingPage "8677" @default.
• W4296554328 abstract "The acid–base properties of surfaces significantly influence catalytic and (photo)electrochemical processes. Estimation of acid dissociation constants (pKa values) for colloids is commonly performed through electroanalytical techniques or spectroscopic methods employing label molecules. Here, we show that polarimetric angle-resolved second harmonic scattering (AR-SHS) can be used as an all-optical, label-free probe of colloid surface pKa values. We apply AR-SHS to dispersions of 100 nm anatase TiO2 particles to extract surface potential and surface susceptibility, a measure of interfacial water orientation, as a function of pH. The surface potential follows changes in surface charge density, while the interfacial water orientation inverts at pH ∼4.8, ∼6, and ∼7.6. As the variation in bulk pH modifies the populations of Ti–OH2+, Ti–OH, and Ti–O– interfacial groups, a change in water orientation reports on the ratio of protonated/deprotonated species. Such observation allows for pKa evaluation from plots of surface susceptibility versus pH. A Nerstian trend in the surface potential is additionally demonstrated." @default.
• W4296554328 created "2022-09-21" @default.
• W4296554328 creator A5020448180 @default.
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• W4296554328 date "2022-09-12" @default.
• W4296554328 modified "2023-10-03" @default.
• W4296554328 title "Water Orientation at the Anatase TiO₂ Nanoparticle Interface: A Probe of Surface p<i>K</i>_a Values" @default.
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• W4296554328 doi "https://doi.org/10.1021/acs.jpclett.2c02453" @default.
• W4296554328 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36094378" @default.
• W4296554328 hasPublicationYear "2022" @default.
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