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Titolo:
Porous organosilicas: An acid-catalyzed approach
Autore:
Burleigh, MC; Markowitz, MA; Spector, MS; Gaber, BP;
Indirizzi:
USN, Res Lab, Ctr Biomol Sci & Engn, Lab Mol Interfacial Interact, Washington, DC 20375 USA USN Washington DC USA 20375 nterfacial Interact, Washington, DC 20375 USA
Titolo Testata:
LANGMUIR
fascicolo: 25, volume: 17, anno: 2001,
pagine: 7923 - 7928
SICI:
0743-7463(200112)17:25<7923:POAAA>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
PERIODIC MESOPOROUS ORGANOSILICAS; CO-CONDENSATION; ORGANIC GROUPS; CHANNEL WALLS; SILICA; MESOPHASES; PRECURSORS; FRAMEWORKS; CHEMISTRY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Markowitz, MA USN, Res Lab, Ctr Biomol Sci & Engn, Lab Mol Interfacial Interact, Code 6930, Washington, DC 20375 USA USN Code 6930 Washington DC USA 20375 shington, DC 20375 USA
Citazione:
M.C. Burleigh et al., "Porous organosilicas: An acid-catalyzed approach", LANGMUIR, 17(25), 2001, pp. 7923-7928

Abstract

Porous organosilica materials have been synthesized by co-condensation of bis(triethoxysilyl)ethane and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AAPTS) under acidic conditions. Cetyltrimethylammonium chloride was usedas a porogen using the surfactant template method. Formation of the mesoscopic composite was followed by surfactant extraction to form the porous organosilicas. These materials have been characterized by nitrogen gas sorption, metal ion adsorption, powder X-ray diffraction, elemental analysis, and high-resolution thermogravimetric analysis. The acid-catalyzed materials formed much faster and with twice the yield of similar organosilicas synthesized under basic conditions. The final products of the acid synthesis also exhibited higher concentrations of the AAPTS functional silane. Although these acidic organosilicas show surface areas and total pore volumes similar to the corresponding base-catalyzed materials, they do not form ordered porestructures. The effects of AAPTS concentration on the chemical and structural properties of the final products are examined.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 03:47:27