Article (Scientific journals)
Characterization of surface and porous properties of synthetic hybrid lamellar silica
Toussaint, Gilles; Rodriguez, Miguel Angel; Cloots, Rudi et al.
2011In Journal of Non-Crystalline Solids, 357, p. 951-957
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Keywords :
hybrid; silica; lamellar
Abstract :
[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.
Disciplines :
Chemistry
Author, co-author :
Toussaint, Gilles ;  Université de Liège - ULiège > Chemistry Department > GreenMat
Rodriguez, Miguel Angel;  Instituto de Ceramica y Vidrio, CSIC, Madrid, Spain
Cloots, Rudi ;  Université de Liège - ULiège > 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  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Henrist, Catherine ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Language :
English
Title :
Characterization of surface and porous properties of synthetic hybrid lamellar silica
Publication date :
2011
Journal title :
Journal of Non-Crystalline Solids
ISSN :
0022-3093
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
357
Pages :
951-957
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
Available on ORBi :
since 24 March 2011

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