Abstract
The results of 3He gas pulsed NMR spin–lattice relaxation study in high-porosity (84.9%–97.9%) nematically ordered Al2O3 aerogels at 1.5 and 4.2 K are presented. The linear dependence of T 1 on gas pressure is observed in aerogels that are pre-plated by helium-4. Nitrogen pre-plating prior to helium-4 pre-plating weakly decreases the 3He gas spin–lattice relaxation rate. A few possible mechanisms plausibly involved in 3He nuclear magnetic relaxation in aerogels are considered. The suggested nuclear spin–lattice relaxation model due to some magnetically ‘dirty’ aerogel fibers allows to estimate the effective mean free path of 3He atoms in aerogel.
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