Influence of functional organic groups on the structure of CTAB templated organosilica thin films

Autor:	Alain Gibaud, Jean-François Bardeau, M. Bellour, V. V. Balasubramanian, Catherine Reyé, M. Dutreilh-Colas, A. Mehdi, Robert J. P. Corriu, Aymeric Robert
Rok vydání:	2004
Předmět:	Chemistry General Chemistry symbols.namesake chemistry.chemical_compound Mesoporous organosilica Bromide Covalent bond Phase (matter) Polymer chemistry Materials Chemistry symbols Grazing-incidence small-angle scattering Organic chemistry Thin film Raman spectroscopy Conformational isomerism
Zdroj:	J. Mater. Chem.. 14:1854-1860
ISSN:	1364-5501 0959-9428
Popis:	Highly ordered mesoporous organosilica thin films containing functional organic terminal groups covalently bonded to the silica matrix were synthesized by co-condensation of tetraethylorthosilicate (TEOS) and organotriethoxysilane RSi(OEt)3 (R = Cl(CH2)3, CN(CH2)3) in the presence of cetyltrimethylammonium bromide (CTAB) as structure directing agent under acidic conditions. The influence of the nature and concentration of these organic groups on the structure of the thin films is evidenced by Grazing Incidence Small Angle Scattering (GISAXS) and X-ray reflectivity. We show that the introduction of chloropropyl groups strongly affects the structure of these films while cyanopropyl groups weakly perturb it. In the case of the chloropropyl groups, the presence of trans and gauche conformers in the films is clearly evidenced by using micro-Raman spectrometry. Their effects on the phase behaviour versus the concentration are discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::42663508a9b66d7f138760cbe549d6b7 https://doi.org/10.1039/b401869a Zobrazit plný text záznamu