title: A Single-Crystalline Mesoporous Quartz Superlattice.
abstract: There has been significant interest in the crystallization of nanostructured silica into α-quartz because of its physicochemical properties. We demonstrate a single-crystalline mesoporous quartz superlattice, a silica polymorph with unprecedentedly ordered hierarchical structures on both the several tens of nanometers scale and the atomic one. The mesoporous quartz superlattice consists of periodically arranged α-quartz nanospheres whose crystalline axes are mostly oriented in an assembly. The superlattice is prepared by thermal crystallization of amorphous silica nanospheres constituting a colloidal crystal. We found that the deposition of a strong flux of Li(+) only on the surface of silica nanospheres is effective for crystallization.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo, 169-8555, Japan.
authors.forename: Takamichi
authors.initials: T
authors.lastname: Matsuno
authors.affiliation: Waseda Institute for Advanced Study, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo, 169-8050, Japan.
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kuroda
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo, 169-8555, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Kitahara
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo, 169-8555, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Shimojima
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo, 169-8555, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Wada
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku-ku, Tokyo, 169-8555, Japan. kuroda@waseda.jp.|Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Nishiwaseda 2-8-26, Shinjuku-ku, Tokyo, 169-0051, Japan. kuroda@waseda.jp.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Kuroda
keywords: colloidal crystals; mesoporous silica; single crystals; superlattices; α-quartz