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Titolo:
Use of organo- and alkoxysilanes in the synthesis of grafted and pristine clays
Autore:
Carrado, KA; Xu, LQ; Csencsits, R; Muntean, JV;
Indirizzi:
Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA Argonne Natl Lab Argonne IL USA 60439 ab, Div Chem, Argonne, IL 60439 USA Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA Argonne Natl Lab Argonne IL USA 60439 Div Mat Sci, Argonne, IL 60439 USA
Titolo Testata:
CHEMISTRY OF MATERIALS
fascicolo: 10, volume: 13, anno: 2001,
pagine: 3766 - 3773
SICI:
0897-4756(200110)13:10<3766:UOOAAI>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
HYBRID MESOPOROUS MATERIALS; NMR-SPECTROSCOPY; LAYER SILICATES; HYDROTHERMAL CRYSTALLIZATION; SURFACE MODIFICATION; PLASMA MODIFICATION; CHEMICAL-SHIFT; METHOXY GROUPS; CHANNEL WALLS; SMECTITE CLAY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
73
Recensione:
Indirizzi per estratti:
Indirizzo: Carrado, KA Argonne Natl Lab, Div Chem, 9700 S Cass Ave, Argonne, IL 60439USA Argonne Natl Lab 9700 S Cass Ave Argonne IL USA 60439 0439 USA
Citazione:
K.A. Carrado et al., "Use of organo- and alkoxysilanes in the synthesis of grafted and pristine clays", CHEM MATER, 13(10), 2001, pp. 3766-3773

Abstract

A one-step, direct method is described for the creation of synthetic smectite clays grafted with organics on the interlayer surfaces using an organotrialkoxysilane as the silica source. The silane employed most successfully is phenyltriethoxysilane (PTES). Aqueous slurries of LiF, magnesium hydroxide, and the silane are refluxed for 2-5 days, and desirable molar compositions are determined. X-ray powder diffraction, thermal analysis, IR, TEM, N-2 sorption isotherms, and solid-state C-13 and Si-29 NMR techniques are used to characterize the products. The loading of organics on the PTES-hectorites is determined at 20-25% and is comprised of phenyl groups as Si-C linkages. Evidence of this linkage includes an IR peak at 1430 cm(-1) and Si-29 NMR assignments at -79 and -66 ppm for RSi(OMg)(OSi)(2) and RSi(OMg)(OSi)(OH) species, respectively. The use of tetraethoxysilane (TEOS) resulted in apure hectorite and comprises the first report of the successful use of a tetraalkoxysilane silicon source for crystallizing hectorite from an aqueoussolution.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 20:47:41