Slow Proton Transfer in Nanoconfined Water
| Autor: | Huib J. Bakker, Oleksandr O. Sofronov |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Proton 010405 organic chemistry Hydrogen bond General Chemical Engineering Diffusion General Chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Chemistry Membrane Chemical physics Ultrafast laser spectroscopy Femtosecond Physics::Atomic and Molecular Clusters Molecule Physics::Chemical Physics Spectroscopy Nuclear Experiment QD1-999 Research Article |
| Zdroj: | ACS Central Science ACS Central Science, Vol 6, Iss 7, Pp 1150-1158 (2020) |
| ISSN: | 2374-7943 |
| Popis: | The transport of protons in nanoconfined environments, such as in nanochannels of biological or artificial proton conductive membranes, is essential to chemistry, biology, and nanotechnology. In water, proton diffusion occurs by hopping of protons between water molecules. This process involves the rearrangement of many hydrogen bonds and as such can be strongly affected by nanoconfinement. We study the vibrational and structural dynamics of hydrated protons in water nanodroplets stabilized by a cationic surfactant using polarization-resolved femtosecond infrared transient absorption spectroscopy. We determine the time scale of proton hopping in the center of the water nanodroplets from the dynamics of the anisotropy of the transient absorption signals. We find that in small nanodroplets with a diameter Time-resolved infrared spectroscopy shows that the hopping of an excess proton from one water molecule to another water molecule occurs much slower in nanodroplets than in bulk. |
| Databáze: | OpenAIRE |
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