Reference : Characterization of surface and porous properties of synthetic hybrid lamellar silica
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Chemistry
http://hdl.handle.net/2268/87634
Characterization of surface and porous properties of synthetic hybrid lamellar silica
English
Toussaint, Gilles [Université de Liège - ULg > Chemistry Department > GreenMat > >]
Rodriguez, Miguel Angel [Instituto de Ceramica y Vidrio, CSIC, Madrid, Spain > > > >]
Cloots, Rudi [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT >]
Rubio, Juan [Instituto de Ceramica y Vidrio, CSIC, Madrid (Spain) > > > >]
Rubio, Fausto [Instituto de Ceramica y Vidrio, CSIC, Madrid (Spain) > > > >]
Vertruyen, Bénédicte mailto [Université de Liège - ULg > Département de chimie (sciences) > Chimie inorganique structurale >]
Henrist, Catherine mailto [Université de Liège - ULg > Département de chimie (sciences) > LCIS - GreenMAT >]
2011
Journal of Non-Crystalline Solids
Elsevier Science
357
951-957
Yes (verified by ORBi)
International
0022-3093
Amsterdam
The Netherlands
[en] hybrid ; silica ; lamellar
[en] Synthetic lamellar silica and hybrid lamellar silicas have been prepared by liquid crystal templating, template extraction and silanization. The samples have been characterized by thermogravimetric analysis (TGA), carbon analysis, spectroscopy, X-ray diffraction (XRD) and nitrogen adsorption. The XRD analyses have shown that the lamellar periodic stacking is preserved for all samples. The quantity and type of organic molecules at the silica surface have been evaluated by carbon analysis, TGA and spectroscopy. The covalent grafting of the solvent used for extraction of the initial surfactant has been highlighted by these analyses. The nitrogen
adsorption analyses have revealed three categories of pores and two types of samples. The initial lamellar silica exhibits a very low specific surface area and plate-like type of pores. The second type of samples is made up of the hybrid samples and the initial substrate from whom the surfactant has been extracted. These samples show a significantly higher specific surface area with interlamellar spaces corresponding to narrow-slit like mesopores around 4 nm. The nitrogen adsorption data analysis has highlighted the presence of micropores within the silica sheets. The difference of the specific surface is due to pore blocking by the surfactant impeding the access to nitrogen into interlamellar spaces and by the silanes covering the pores once the surface modified. The presence of micro and mesopores combined to a high BET specific surface of 612 m²/g makes these lamellar silicas interesting materials for catalysis applications.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals
http://hdl.handle.net/2268/87634
10.1016/j.jnoncrysol.2010.10.035
The following article appeared in Journal of Non-Crystalline Solids and may be found on the editor website http://www.sciencedirect.com/

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