منابع مشابه
EXAFS and 27Al NMR Studies of CaAl2O14H20 Structural Changes Due to Heat Treatments
At low temperature (T<lO°C), CaAl201fio is formed by hydration of high-alumina cements (HACs). HACs are used for rekactory applications; heat treatments then lead to thermal decomposition of CaAl201fio. which first dehydrates to CaAl~04& (X < 10) and finally to the anhydrous phase CaA1204. In CaAlzOl&, aluminium atoms are 6-coordinated, whereas they are 4-coordinated in CaAl20.4. Materials heat...
متن کاملSTRUCTURAL DIAGNOSTIC OF HIGH TEMPERATURE LIQUID PHASES BY 27Al NMR
Improvements of welding processes by plasma or laser require a good knowledge of the microscopic properties of the liquid associated to the melted area. The development of new high temperature NMR probes allows to reach such a goal. In the case of alumina bearing liquids, the analysis of the 27Al resonance line shows a rapid exchange regime of AI in four, five or six fold coordination together ...
متن کاملProbing 27Al-13C proximities in metal-organic frameworks using dynamic nuclear polarization enhanced NMR spectroscopy.
We show how (27)Al-(13)C proximities in the microporous metal-organic framework MIL-100(Al) can be probed using advanced (27)Al-(13)C NMR methods boosted by Dynamic Nuclear Polarization.
متن کاملSYNTHESIS OF SOME SUBSTITUTED NAPHTHALENES VIA BENZYNE AND THEIR 13C-NMR AND 'H-NMR STUDIES
Aprotic diazotization of anthranilic acid with isoamylnitrite or amylnitrite gave benzenediazonium-2- carboxylate. Subsequent thermal decomposition of this diazonium salt (in situ) in 1,2-dichloroethane as a solvent at 85OC and in the presence of 2,5-diethyl-3,4-diphenylcyclopentadienonaes a trapping agent gave 1,4-diethyl-2, 3-diphenylnaphthalene in high yield, after loss of carbon monoxid...
متن کامل23Na and 27Al NMR Study of Structure and Dynamics in Mordenite
Temperature dependencies of 27Al and 23Na nuclear magnetic resonance spectra and spin-lattice relaxations in mordenite have been studied in static and magic angle spinning regimes. Our data show that the spin-lattice relaxations of the 23Na and 27Al nuclei are mainly governed by interaction of nuclear quadrupole moments with electric field gradients of the crystal, modulated by translational mo...
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ژورنال
عنوان ژورنال: Physics Procedia
سال: 2015
ISSN: 1875-3892
DOI: 10.1016/j.phpro.2015.12.099