Unveiling Heterogeneity of Interfacial Water through the Water Bending Mode
| Autor: | Lisa B. Dreier, Takakazu Seki, Chun-Chieh Yu, Yuki Nagata, Shumei Sun, Ellen H. G. Backus, Kevin Machel, Kai Zhong, Mischa Bonn |
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| Přispěvatelé: | IoP (FNWI), Soft Matter (WZI, IoP, FNWI) |
| Rok vydání: | 2019 |
| Předmět: |
Physics::Biological Physics
Quantitative Biology::Biomolecules Letter Materials science Intermolecular force Mode (statistics) 02 engineering and technology Bending 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Spectral line shape Condensed Matter::Soft Condensed Matter Chemical physics General Materials Science Physics::Chemical Physics Physical and Theoretical Chemistry 0210 nano-technology Physics::Atmospheric and Oceanic Physics |
| Zdroj: | The Journal of Physical Chemistry Letters Journal of Physical Chemistry Letters, 10(21), 6936-6941. American Chemical Society |
| ISSN: | 1948-7185 |
| DOI: | 10.1021/acs.jpclett.9b02748 |
| Popis: | The water bending mode provides a powerful probe of the microscopic structure of bulk aqueous systems because its frequency and spectral line shape are responsive to the intermolecular interactions. Furthermore, interpreting the bending mode response is straightforward, as the intramolecular vibrational coupling is absent. Nevertheless, bending mode has not been used for probing the interfacial water structure, as it has been yet argued that the signal is dominated by bulk effects. Here, through the sum-frequency generation measurement of the water bending mode at the water/air and water/charged lipid interfaces, we demonstrate that the bending mode signal is dominated not by the bulk but by the interface. Subsequently, we disentangle the hydrogen-bonding of water at the water/air interface using the bending mode frequency distribution and find distinct interfacial hydrogen-bonded structures, which can be directly related to the interfacial organization of water. The bending mode thus provides an excellent probe of aqueous interfacial structure. |
| Databáze: | OpenAIRE |
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