Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Hybrid organic-inorganic xerogel access to meso- and microporous silica bythermal and chemical treatment
Autore:
Boury, B; Chevalier, P; Corriu, RJP; Delord, P; Moreau, JJE; Chiman, MW;
Indirizzi:
UnivrMontpellier 2, Lab Chim Mol & Org Solide, UMR 5637, F-34095 Montpellie Univ Montpellier 2 Montpellier France 5 de, UMR 5637, F-34095 Montpellie Univier,tpellier 2, Dynam Phases Condensees Grp, UMR 5581, F-34095 Montpell Univ Montpellier 2 Montpellier France F-34095 UMR 5581, F-34095 Montpell Ecole Natl Super Chim, ESA 5076, Lab Chim Organomet, F-34296 Montpellier 5, Ecole Natl Super Chim Montpellier France 5 nomet, F-34296 Montpellier 5,
Titolo Testata:
CHEMISTRY OF MATERIALS
fascicolo: 2, volume: 11, anno: 1999,
pagine: 281 - 291
SICI:
0897-4756(199902)11:2<281:HOXATM>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
STEREOCHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Corriu, RJP Univ34095pellier 2, Lab Chim Mol & Org Solide, UMR 5637, Pl E Bataillon, F- Univ Montpellier 2 Pl E Bataillon Montpellier France 5 on, F-
Citazione:
B. Boury et al., "Hybrid organic-inorganic xerogel access to meso- and microporous silica bythermal and chemical treatment", CHEM MATER, 11(2), 1999, pp. 281-291

Abstract

Hybrid xerogels of general formula (O)(1,5)Si-C=C-(CH2)(n)-C=C-Si(O)(1,5) were prepared by sol-gel polycondensation in THF of the corresponding precursors (H3CO)(3)Si-C=C-(CH2)(n)-C=C-Si(OCH3)(3), without catalyst. Treatmentof the hybrid xerogels was with methanol and water in the presence of 2.0%of ammonium fluoride as catalyst. For 2 < n < 4, elimination of the organic spacer was quantitatively achieved and the organic spacer was recovered in high yield. For n = 5, 6, and 8, increasing the length of the spacer results in a decreasing efficiency of this chemical treatment. Thermal oxidation at 600-680 degrees C of the hybrid xerogels was also performed and elimination of the organic spacer was obtained in all the cases. Mesoporous silica with a narrow pore-size distribution was obtained by chemical treatment of the xerogel with n = 2-4. Microporous silica was obtained by thermal treatment of the xerogel at 680 degrees C. All the materials were characterizedby SAXS, BET, and spectroscopy analysis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 18:34:40