Dynamics of Guest Water Molecules in Pillared Mordenite Studied by 1H NMR Relaxation.

Autor: Shelyapina, Marina G., Nefedov, Denis Yu., Antonenko, Anastasiia O., Hmok, H'Linh, Egorov, Andrei V., Egorova, Maria I., Ievlev, Alexandr V., Yocupicio-Gaxiola, Rosario, Petranovskii, Vitalii, Antúnez-García, Joel, Fuentes, Sergio
Zdroj: Applied Magnetic Resonance; Oct2023, Vol. 54 Issue 10, p915-928, 14p
Abstrakt: The dynamics of H2O molecules confined in mesopores of about 3.4 nm in size, formed by amorphous SiO2 pillars separating 2D mordenite nanolayers, was probed by 1H nuclear magnetic relaxation. 1H nuclear magnetic resonance (NMR) spectra evidence the presence of water with different local surroundings and mobility. The temperature dependence of 1H spin–lattice relaxation T1 and relaxation in rotating frame T1ρ indicate the complex behavior of nanoconfined water that can be characterized by different activation energies: freezing (29 kJ/mol), fast rotation (12 kJ/mol), and translational motion (23.6 kJ/mol). [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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