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Published on: July 4, 2016
Proton Dipolar Spin-Lattice Relaxation in Nano-channels of Natrolite
M Paczwa1, A A Sapiga2, M Olszewski1
1Department of Mathematical and Physics, Institute of Physics, University of Szczecin, Wielkopolska str.-15, 70-451 Szczecin, Poland.
Abstract:
The 1H nuclear magnetic resonance (NMR) spectra and the dipolar spin-lattice relaxation time T1D for 1H in the natural natrolite (Na2Al2Si3O10·2H2O) have been measured in the temperature range of 190-390 K. From the temperature transformations of 1H NMR spectra, it follows that at T > 300 K, the diffusion of water molecules along the nano-channels is observed. From experimental T1D data, it follows that the 180° flip motion of the water molecules takes place in natrolite. At low temperature (T < 250 K), the dipolar interaction with paramagnetic impurities as a relaxation mechanism of 1H nuclei becomes significant.
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