Objectif
"The objective is to synthesise non-oxide mesoporous materials, boron nitride (BN) and silicon carbide (SiC). These new materials will have both high thermal and chemical stabilities associated to an homogeneous mesoporosity (pore diameter 2-30 nm), periodically structured. They will find applications in catalysis, in analytical chemistry, and also in nanotechnologies. In the case of silica, the self-assembly process has led to materials with a periodical arrangement of nanopores having an homogenous size. Copo lymers triblock have been used as structurating agents for the synthesis of ordered SBA-15 mesoporous silica with an hexagonal porosity organization and with pore size up to 30 nm. Mesoporous carbons have been recently prepared by using silica as hard-templates. Sucrose, infiltrated in the channels of the porous silica, is carbonized. A mesoporous carbon is obtained after template elimination by chemical washing. To extend the field of ordered mesoporous silica to non-oxide materials, we will use this innovative exo-templating approach. Mesoporous silica will be used as hard-templates to perform the synthesis of ordered porous non-oxide materials. Infiltration of hard-templates can be performed using a liquid ceramic precursor (a borazinic or a polysilane co mpound), followed with a ceramization step. For boron nitride, the molecular precursor is the trichloroborazine, TCB (B3N3H3Cl3). For the silicon carbide, a polydimethylsilane precursor (PDMS) will be used. Various pyrolysis steps to convert precursors (TC B or PDMS) into ceramics will be studied. Characterizations of the materials will be carried out using X-ray diffraction analysis, Scanning and Transmission Electronic Microscopies, NMR, Infrared and Raman analysis. Porosity will be studied by using adsorption/desorption of nitrogen. X-ray photoelectron spectroscopy (XPS) and Rutherford Backscattering Spectrometry (RBS) will be performed to characterize BN and SiC mesoporous films."
Champ scientifique (EuroSciVoc)
CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN.
CORDIS classe les projets avec EuroSciVoc, une taxonomie multilingue des domaines scientifiques, grâce à un processus semi-automatique basé sur des techniques TLN.
- sciences naturellessciences chimiqueschimie analytique
- sciences naturellessciences chimiqueschimie inorganiquecomposé inorganique
- ingénierie et technologienanotechnologie
- sciences naturellessciences chimiqueschimie inorganiquemétalloïde
- ingénierie et technologieingénierie des materiauxcéramique
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Mots‑clés
Appel à propositions
FP6-2004-MOBILITY-7
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Régime de financement
IIF - Marie Curie actions-Incoming International FellowshipsCoordinateur
VILLEURBANNE
France