In-situ spin trap electron paramagnetic resonance study of fuel cell processes

2004 ◽  
Vol 6 (11) ◽  
pp. 2891 ◽  
Author(s):  
Alexander Panchenko ◽  
Herbert Dilger ◽  
Jochen Kerres ◽  
Martin Hein ◽  
Andreas Ullrich ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fuel Cell ◽  
Spin Trap ◽  
Electron Paramagnetic Resonance Study ◽  
Trap Electron ◽  
Paramagnetic Resonance ◽  
Cell Processes ◽  
Electron Paramagnetic

Electron Paramagnetic Resonance Study of Ion-Implanted Photorefractive Crystals

1997 ◽  
Vol 504 ◽  
Author(s):  
A. Darwish ◽  
D. Ila ◽  
E. K. Willams ◽  
D. B. Poker ◽  
D. K. Hensley
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Ion Implantation ◽  
Room Temperature ◽  
Electron Paramagnetic Resonance Study ◽  
Paramagnetic Resonance ◽  
Photorefractive Crystals ◽  
Laser Illumination ◽  
Epr Signal ◽  
Electron Paramagnetic

ABSTRACTThe effect of the ion implantation (Fe) on LiNbO3, MgO, and A12O3 crystals is studied using electron paramagnetic resonance (EPR). EPR measurements on these crystals were performed as a function of fluence at room temperature. The fluence was 1 × 1014 and 1 × 1016 ions/cm2. The unpaired carrier concentration increases with increasing fluence. The photosensitivity of these crystals was determined by observing in situ the effect of the laser illumination on the EPR signal and measuring the decay and the growth of the EPR signal. The EPR signal of Fe3+ was found to decrease in both MgO, and Al2O3; and was found to increase in LiNbO3. This indicated that in case of MgO, and A12O3 Fe3+ will transfer into Fe2+/Fe4+, but in case of LiNbO3 Fe2+/ Fe4+ will transfer into Fe3+; increasing the EPR signal. This was found primary due to some Fe2+ and Fe4+ ions, which is not intentionally doped on the LiNbO3 crystal but exist as a defect on the crystal.

Observation of Fuel Cell Membrane Degradation by Ex Situ and In Situ Electron Paramagnetic Resonance

2008 ◽  
Vol 155 (6) ◽  
pp. B570 ◽  
Author(s):  
B. Vogel ◽  
E. Aleksandrova ◽  
S. Mitov ◽  
M. Krafft ◽  
A. Dreizler ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fuel Cell ◽  
Cell Membrane ◽  
Ex Situ ◽  
Membrane Degradation ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

Electron paramagnetic resonance study of the reactions of the spin trap 2,4,6-tribromonitrosobenzene in benzene solutions

1992 ◽  
Vol 70 (1) ◽  
pp. 116-120 ◽  
Author(s):  
Peter Smith ◽  
Kirk Randall Maples ◽  
Ramona Lillian Lau
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Spin Trap ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Electron Paramagnetic Resonance Study ◽  
Azo Compounds ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Ene Reaction ◽  
Free Radical Formation ◽  
Electron Paramagnetic

By means of static-sample studies involving the thermal decomposition of symmetric azo compounds and the oxidation of substrates with nickel peroxide, we have characterized by electron paramagnetic resonance 12 spin adducts of 2,4,6-tribromonitrosobenzene, 1, in benzene at 25 °C. In addition, we have used electron paramagnetic resonance spectroscopy to investigate benzene solutions of 1 both by itself and in the presence of olefins, and both in the presence and absence of light. Although 1 by itself did not give evidence for any free radical formation, when 1 was mixed with any one of the 11 olefins tested we could detect nitroxide formation. The presence of light did not affect our results. These observations support the "ene" reaction mechanism of nitroxide formation. Keywords: 2,4,6-tribromonitrosobenzene, spin trapping, nickel peroxide.

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