title: Yttrium-Based Porous Materials Templated by Anionic Surfactant Assemblies.
abstract: The layered and hexagonal yttrium-based surfactant mesophases templated by anionic surfactant (C(n)()H(2)(n)()(+1)OSO(3)(-) and C(n)()H(2)(n)()(+1)SO(3)(-)) assemblies were synthesized by the homogeneous precipitation method using urea. The layered mesophase is formed of a layered but curving or bending microstructure and transformed into a hexagonal mesostructure with complex and attractive morphologies such as plate-, dish-, and crown-like shapes. The specific surface area of the mesostructured solid increases from 53 m(2) g(-)(1) for the layered form to 251-322 m(2) g(-)(1) for the hexagonal form, due to the formation of hexagonally arranged cylindrical micropores loosely occupied by surfactant molecules. The anion-exchange of the hexagonal mesophase with acetate species results in a mesoporous material with a specific surface area of as large as 545 m(2) g(-)(1).
authors.affiliation: Department of Materials Science, Faculty of Engineering, Miyazaki University, Miyazaki, 889-2192, Japan.
authors.forename: Mitsunori
authors.initials: M
authors.lastname: Yada
authors.forename: Hirohumi
authors.initials: H
authors.lastname: Kitamura
authors.forename: Masato
authors.initials: M
authors.lastname: Machida
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Kijima