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- W2412892778 abstract "Incoherent neutron scattering by water confined in carbon nanohorns was measured with the backscattering spectrometer SPHERES and analyzed in exemplary breadth and depth. Quasielastic spectra admit $ensuremath{delta}$-plus-Kohlrausch fits over a wide $q$ and $T$ range. From the $q$ and $T$ dependence of fitted amplitudes and relaxation times, however, it becomes clear that the fits do not represent a uniform physical process, but that there is a crossover from localized motion at low $T$ to diffusive $ensuremath{alpha}$ relaxation at high $T$. The crossover temperature of about 210 to 230 K increases with decreasing wave number, which is incompatible with a thermodynamic strong-fragile transition. Extrapolated diffusion coefficients $D(T)$ indicate that water motion is at room temperature about 2.5 times slower than in the bulk; in the supercooled state this factor becomes smaller. At even higher temperatures, where the $ensuremath{alpha}$ spectrum is essentially flat, a few percentages of the total scattering go into a Lorentzian with a width of about $1.6phantom{rule{0.28em}{0ex}}ensuremath{mu}mathrm{eV}$, probably due to functional groups on the surface of the nanohorns." @default.
- W2412892778 created "2016-06-24" @default.
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- W2412892778 date "2016-02-02" @default.
- W2412892778 modified "2023-10-18" @default.
- W2412892778 title "Crossover from localized to diffusive water dynamics in carbon nanohorns: A comprehensive quasielastic neutron-scattering analysis" @default.
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- W2412892778 doi "https://doi.org/10.1103/physreve.93.022104" @default.
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