Abstract
We study the dynamics of the nuclear spins in a liquid entrapped in nanosized cavities. This spin system is like a solid system where all the spins are coupled equally with the same interaction constant. It is shown that, under the high temperature approximation, the system is described by the two-temperature quasi-equilibrium density matrix. We find that the mixing rate W and the local dipolar field ωloc depend on the cavity size V, shape F, and cavity orientation. For a large number of spins N the rate W decreases as the inverse square root of the number of spins, and is proportional to the concentration of the molecules, C. The spin-lattice relaxation rates, 1/T1ρ and 1/T1d, are proportional to C2/N. An NMR study of the dynamics of a spin system allows extraction of the cavity size and shape, its orientation relative to the magnetic field, and the molecular concentration.
Original language | English |
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Pages (from-to) | 9200-9204 |
Number of pages | 5 |
Journal | Soft Matter |
Volume | 8 |
Issue number | 35 |
DOIs | |
State | Published - 1 Jan 2012 |
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics