| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
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
| Organizations | Location | People |
|---|
article
Nanoscaled Sn and Pb particles aligned in Al2O3 tubes obtained from molecular precursors
Abstract
Tin and lead nanoparticles and metal sponges were prepared by reducing Me2Si(NtBu)2Sn (7) and Me2Si(NtBu)2Pb (9) with [H2AlOtBu] (3), [HAl(OtBu)2] (13), [H2AlOSiMe2tBu] (8), and [(Me2tBuSiO)2AlH] (15). Together with dihydrogen and the metals in their elemental state the monomeric compounds [Me2Si(NtBu)2Al(OSiMe2tBu)(THF)] (10) and [Me2-Si(NtBu)2Al(OtBu)(THF)] (11) can be obtained, to mention only two examples. Each monomer is stabilized by a THF molecule coordinated to aluminum, which on sublimation loses its donor molecule and dimerizes through Lewis acid-base interactions to the spiro compounds [Me2Si(NtBu)2AlO-SiMe2tBu]2 (12) and [Me2Si(NtBu)2AlOtBu]2 (4), respectively. The molecular structures of 10, 11, and 12 were determined by single-crystal X-ray diffraction techniques. The reduction of 7 at -115 °C is gradually indicated by a color change of the reaction mixtures from red to dark brown with increasing temperature and depending on the reducing agent used. The tin powders that were obtained were identified as ?-tin using X-ray powder diffraction techniques and their average crystallite size depends on the polarity of the solvent and hydride used. Under certain conditions metal sponges are formed. Pycnometric measurements were carried out on the tin and lead sponges. These showed almost the known densities for the metals when helium was used whereas significantly smaller ones were measured in water. Porous alumina membranes of different pore diameters were filled with tin and lead particles. Metal nanoparticles were prepared within the tubes of the membranes by reduction of the metal amides in the pores. The infiltration process can be repeated up to ten times increasing the amount of particles within the tubes monitored by SEM. The obtained brown or black membranes were characterized by SEM, EDX, and UV/Vis analysis. The filled membranes show sharp impervious ranges in the UV/ Vis spectrum between 270 and 525 nm and could therefore be used as wavelength filters. (Résumé d'auteur)