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Communication: Slow proton-charge diffusion in nanoconfined water.
Tibert H van der Loop1, Niklas Ottosson2, Thomas Vad3
1Van 't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands.
The Journal of Chemical Physics
|April 10, 2017
Summary
Proton charge mobility in tiny water droplets slows significantly as size decreases. This reduced diffusion in nanoconfined water impacts dielectric relaxation, with implications for hydrogen-bond network dynamics.
Area of Science:
- Physical Chemistry
- Nanotechnology
- Materials Science
Background:
- Proton charge mobility is crucial for many chemical and biological processes.
- Understanding proton transport in confined environments is essential for nanoscale applications.
- Water's hydrogen-bond network dynamics influence proton diffusion.
Purpose of the Study:
- To investigate proton-charge mobility in nanoscopic water droplets of varying sizes.
- To determine the relationship between droplet size and proton diffusion.
- To understand the impact of confinement on dielectric relaxation in water.
Main Methods:
- Utilized tuneable-sized nanoscopic water droplets.
- Measured dielectric relaxation processes.
- Determined proton-charge diffusion constants at the nanoscale.
Main Results:
- Proton-charge diffusion slows significantly in water droplets <5 nm in diameter.
- For droplets <1 nm, the diffusion constant is ~100 times smaller than in bulk water.
- A dielectric relaxation process was observed, linked to confined proton diffusion.
Conclusions:
- Proton-charge mobility is strongly size-dependent in nanoconfined water.
- Reduced mobility is attributed to a more rigid hydrogen-bond network in smaller droplets.
- Confinement effects on water's hydrogen-bond network are critical for understanding proton transport.