Isothermal Annealing Kinetics of X-Irradiated Pyrene by Electron Paramagnetic Resonance

1990 ◽  
Vol 122 (2) ◽  
pp. 126
Author(s):  
C. S. M. Partiti ◽  
W. M. Pontuschka ◽  
A. Fazzio ◽  
A. Piccini
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Isothermal Annealing ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic ◽  
Kinetics Of

Characterization of titanium dopants in sodium alanate by electron paramagnetic resonance spectroscopy

2005 ◽  
Vol 20 (12) ◽  
pp. 3265-3269 ◽  
Author(s):  
Meredith T. Kuba ◽  
Sandra S. Eaton ◽  
Christine Morales ◽  
Craig M. Jensen
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Epr Spectra ◽  
Minor Amount ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Dehydrogenation Kinetics ◽  
Electron Paramagnetic ◽  
Kinetics Of

Electron paramagnetic resonance (EPR) spectra were obtained for samples of Ti-doped NaAlH4 subjected to different numbers of cycles of dehydrogenation/re-hydrogenation. Ti is observed to evolve from its initial Ti(III) state through a series of Ti(0) species during the first 5 cycles. Although the conversion of Ti(III) to Ti(0) occurs much more readily for TiCl3-doped samples than those prepared with TiF3, in both cases the evolution of Ti follows the same sequence that involves 3 distinguishable Ti(0) species and ends in the predominance of the same single Ti(0) species. The spectrum of a sample of NaAlH4 containing 2 mol% of cubic Al3Ti is distinctly different than any of those observed for the Ti(0) species that arise during the hydrogen cycling of the hydride. The major changes in the nature of the predominant Ti species have little if any effect on the dehydrogenation kinetics, which strongly suggests that the profoundly enhanced hydrogen cycling kinetics of Ti-doped NaAlH4 are due to a Ti species present in only a relatively minor amount.

Kinetics of Formation of Micelle-Templated Silica Mesophases Monitored by Electron Paramagnetic Resonance

1998 ◽  
Vol 201 (2) ◽  
pp. 105-117 ◽  
Author(s):  
Anne Galarneau ◽  
Francesco Di Renzo ◽  
François Fajula ◽  
Laura Mollo ◽  
Bice Fubini ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Kinetics Of Formation ◽  
Electron Paramagnetic ◽  
Kinetics Of
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