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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Blin, Joël
Centre de Coopération Internationale en Recherche Agronomique pour le Développement
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (8/8 displayed)
- 2023Synthesis of potassium polyferrite KxFeyOz heterogeneous catalyst for sunflower oil ethanolic transesterificationcitations
- 2015Improving the kinetics of the CO2 gasification of char through the catalyst/biomass integration conceptcitations
- 2015The catalyst/biomass integration concept for the direct thermo-catalytic conversion of biomass into either syngas or added-value molecules
- 2014Optimization of pyrolysis conditions for production of reductant charcoal
- 2014Optimization of quality of charcoal for steelmaking using statistical analysis approach
- 2012Improvement of charcoal yield by two-step pyrolysis on eucalyptus wood : A thermogravimetric studycitations
- 2005Nanoscaled Sn and Pb particles aligned in Al2O3 tubes obtained from molecular precursorscitations
- 2003The metastable, glasslike solid-state phase of HAlO and its transformation to Al/Al2O3 using a CO2 lasercitations
Places of action
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article
The metastable, glasslike solid-state phase of HAlO and its transformation to Al/Al2O3 using a CO2 laser
Abstract
Bis(tert-butoxyaluminum dihydride) (tBuOAlH2)2 decomposes on metal surfaces heated to 250 C (Fe, Ni, Cu, Pt) and under reduced pressures of 0.01 0.1 atm with elimination of dihydrogen and isobutene to form a glasslike, amorphous film, which is composed of equimolar parts of hydrogen, aluminum and oxygen (elemental analysis, EDX analysis). The gases eliminated during this process were characterized by mass spectroscopy (H2, isobutene) or by infrared matrix techniques (isobutene). The exclusive binding of hydrogen to aluminum is deduced from IR spectroscopy of the HAlO film and of its deuterated form DAlO. The HAlO layer (which shows no X-ray diffraction pattern), when heated to 450 C or when exposed to a CO2 laser, loses hydrogen and transforms to an almost stoichiometric composite with nanoscale crystalline aluminum and aluminum oxide (Al/Al2O3) as ingredients. This transformation may be followed by IR spectroscopy, by 27Al MAS NMR or by XPS, the latter showing different signals (Al, 2p electrons, Mg-K[alpha], [thêta] = 0 °) for HAlO (74.2 eV) and for the composite (Al: 72.1 eV, Al2O3: 75.3 eV). Microstructures that are characterized by different chemical compositions and different optical contrasts of the ''drawing'', relative to the surrounding matrix, may be generated with an X/Y-table and a CO2 laser. (Résumé d'auteur)