SBA-15 surface functionalization via ferrocenyl Fischer chromium carbene coatings: Technology and textural properties

A ferrocenyl Fischer chromium carbene complex has been covalently grafted on the SBA-15 surface. The method of synthesis of this carbene is a classical one while the surface attachment of such compound on the SBA-15 pores is made via a bridging molecule of 3-aminopropyltriethoxysilane. Important phy...

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Bibliographic Details
Published in:Surface & coatings technology 2009-02, Vol.203 (10), p.1444-1451
Main Authors: Ojeda, M.L., Campero, A., Velásquez, C., López-Cortés, J.G., Alvarez, C., Esparza, J.M., Rojas, F.
Format: Article
Language:English
Subjects:
Applied sciences
Bimetallic carbene complexes
Covalently grafted layer
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Mesoporous composites
Metallic coatings
Metals. Metallurgy
Physics
Pore wall thickness
Pore-width modulation
Production techniques
Surface treatment
Surface treatments
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Summary:A ferrocenyl Fischer chromium carbene complex has been covalently grafted on the SBA-15 surface. The method of synthesis of this carbene is a classical one while the surface attachment of such compound on the SBA-15 pores is made via a bridging molecule of 3-aminopropyltriethoxysilane. Important physicochemical properties (XRD, TEM, and N 2 sorption) of the preceding substrate, which involves the extra benefit of chemically adhering two transition metals (Fe and Cr) to the SBA-15 surface, are herein presented. The creation of covalent bonds between the silica surface and the ferrocenyl chromium carbene molecules is confirmed by FTIR spectroscopy. The pore size distributions of unfunctionalized and functionalized SBA-15 substrates (determined by N 2 sorption) shed light about two issues: (i) a diminution of the pore width, surface area, and total pore volume (with respect to that existing in the uncoated SiO 2 material) when ferrocenyl chromium carbene molecules are grafted to the pore surface; and (ii) the possibility of approximately knowing the thickness of the grafted layer of molecules. Calcination of the functionalized SiO 2 substrate at 500 °C reincreases the free pore diameter and sharpens the pore size distribution while preserving the cylindricity of the pore walls.
ISSN:0257-8972
1879-3347
DOI:10.1016/j.surfcoat.2008.11.014