Low-dimensional effects on frequency dependence of proton NMR relaxation in liquid cyclohexane confined to porous glasses
✍ Scribed by P. Koziol; S.D. Nelson; J. Jonas
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 292 KB
- Volume
- 201
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
1H NMR spin-lattice relaxation times were measured for cyclohexane confined to sol-gel porous silica glasses with 17.2 and 20.4A pore radii. The relaxation times were measured at five different frequencies: 9.2,60, 180,300 and 500 MHz. Additionally the measurements of the spin-lattice relaxation times in the rotating frame, T,, were performed with the frequency of the spinlocking pulse 4 x I 03-8.5 x I O4 rad/s. At low frequencies a linear dependence of I / T,, versus log w was found. In the studied frequency range the relaxation rates change with frequency and pore size as predicted by the theory of restricted translational diffusion in two-dimensional systems.