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Titolo:
Porous yttrium aluminum oxide templated by alkyl sulfate assemblies
Autore:
Yada, M; Ohya, M; Ohe, K; Machida, M; Kijima, T;
Indirizzi:
Miyazaki Univ, Fac Engn, Dept Appl Chem, Miyazaki 8892192, Japan Miyazaki Univ Miyazaki Japan 8892192 Appl Chem, Miyazaki 8892192, Japan
Titolo Testata:
LANGMUIR
fascicolo: 4, volume: 16, anno: 2000,
pagine: 1535 - 1541
SICI:
0743-7463(20000222)16:4<1535:PYAOTB>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOLECULAR-SIEVES; MESOPOROUS MATERIALS; SURFACTANT; MECHANISM; TRANSITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Yada, M Miyazaki Univ, Fac Engn, Dept Appl Chem, Miyazaki 8892192, Japan Miyazaki Univ Miyazaki Japan 8892192 em, Miyazaki 8892192, Japan
Citazione:
M. Yada et al., "Porous yttrium aluminum oxide templated by alkyl sulfate assemblies", LANGMUIR, 16(4), 2000, pp. 1535-1541

Abstract

Mesostructured hexagonal yttrium aluminum oxides templated by alkyl sulfate assemblies were synthesized by the homogeneous precipitation method usingurea The unit cell parameter a of the hexagonal mesophases is controllableby the alkyl chain length of the incorporated surfactant molecules as in the aluminum-based end member system, although the cell dimension of the yttrium-based system is little dependent on the alkyl chain length. The hexagonal yttrium aluminum based dodecyl sulfate mesophases with Al/(Al+Y) molar ratios of 0.54 or above were obtained as a single phase, whereas those withlower Al/(Al+Y) ratios coexisted with the yttrium-based mesophase. The Y-Al based hexagonal mesophases with 0.54 less than or equal to Al/(Al+Y) lessthan or equal to 0.74 were converted into an ordered porous material with a specific surface area of 662-797 m(2)g(-1) by the anion exchange of alkylsulfate surfactants with acetate ions, in contrast to the collapse of the hexagonal mesophases with Al/(Al+Y) > 0.74 by the same treatment. The much higher stability of the former hexagonal phase upon acetate treatment was attributed to the increased ratio of 6-coodinate to 4-coodinate Al polyhedra.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 10/07/20 alle ore 09:04:05