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- W2020408544 abstract "At low temperatures, liquids imbibed into nanoporous materials form frozen solid cores in the interior of pores. Inbetween the cores and the pore walls, there exists a layer of nonfrozen liquid. As demonstrated here by nuclear magnetic resonance magnetization transfer and cryoporometry experiments, pools of nuclear spins that reside in those two separate domains, core and liquid layer, exchange nuclear Zeeman magnetization. This exchange is detectable in these materials thanks to the high contact area. Based on this phenomenon, we propose a new method for measuring the surface-to-volume ratio and for accessing the pore space morphology in nanoporous materials. By monitoring the magnetization transfer process, information can be obtained: (i) on the geometrical characteristics of the porous space and (ii) on the diffusivity of nuclear magnetization in the frozen phase. The diffusive transport of nuclear magnetization in the frozen core can be contributed by two mechanisms: spatial atomic/molecular diffusion and spin diffusion through nuclear dipole–dipole interaction. For the water–ice system in controlled porous glasses of known morphology, we can separate these two mechanisms to obtain an estimate of the proton diffusion coefficient of 4×10−16 m2/s in ice at 255 K." @default.
- W2020408544 created "2016-06-24" @default.
- W2020408544 creator A5033726095 @default.
- W2020408544 creator A5061981173 @default.
- W2020408544 date "2002-07-16" @default.
- W2020408544 modified "2023-10-16" @default.
- W2020408544 title "The morphology of coexisting liquid and frozen phases in porous materials as revealed by exchange of nuclear spin magnetization followed by H1 nuclear magnetic resonance" @default.
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- W2020408544 doi "https://doi.org/10.1063/1.1488585" @default.
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