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- W2062095185 abstract "Mesostructured hexagonal yttrium aluminum oxides templated by alkyl sulfate assemblies were synthesized by the homogeneous precipitation method using urea. The unit cell parameter a of the hexagonal mesophases is controllable by 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 with lower Al/(Al+Y) ratios coexisted with the yttrium-based mesophase. The Y−Al based hexagonal mesophases with 0.54 ≤ Al/(Al+Y) ≤ 0.74 were converted into an ordered porous material with a specific surface area of 662−797 m2g-1 by the anion exchange of alkyl sulfate 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-coordinate Al polyhedra." @default.
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- W2062095185 date "1999-12-10" @default.
- W2062095185 modified "2023-10-16" @default.
- W2062095185 title "Porous Yttrium Aluminum Oxide Templated by Alkyl Sulfate Assemblies" @default.
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- W2062095185 doi "https://doi.org/10.1021/la990493p" @default.
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