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- W1984920367 abstract "$^{29}mathrm{Si}$ nuclear relaxation experiments were performed in different forms of silica (alcogel, aerogel, amorphous, and crystallized) doped with paramagnetic impurities. Magic-angle spinning is used to quench the nuclear-spin diffusion. Under this condition, the saturation recovery of the $^{29}mathrm{Si}$ magnetization follows a power law in a very large time range (up to 5 orders of magnitude). This nonexponential relaxation m(t)ensuremath{sim}${mathit{t}}^{mathrm{ensuremath{alpha}}}$ reflects the mass distribution in the sample: M(r)ensuremath{sim}${mathit{r}}^{mathit{D}}$ with ensuremath{alpha}=D/6. In aerogels, the measured fractal dimension Densuremath{approxeq}2.2 is in agreement with that determined by small-angle x-ray scattering. In densified materials, a dimension Densuremath{approxeq}3 is actually observed." @default.
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- W1984920367 date "1990-07-30" @default.
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- W1984920367 title "NMR determination of the fractal dimension in silica aerogels" @default.
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- W1984920367 doi "https://doi.org/10.1103/physrevlett.65.614" @default.
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