title: Tricontinuous Cubic Nanostructure and Pore Size Patterning in Mesostructured Silica Films Templated with Glycerol Monooleate.
abstract: The fabrication of nanostructured films possessing tricontinuous minimal surface mesophases with well-defined framework and pore connectivity remains a difficult task. As a new route to these structures, we introduce glycerol monooleate (GMO) as a template for evaporation-induced self-assembly. As deposited, a nanostructured double gyroid phase is formed, as indicated by analysis of grazing-incidence small-angle x-ray scattering data. Removal of GMO by UV/O(3) treatment or acid extraction induces a phase change to a nanoporous body-centered structure which we tentatively identify as based on the IW-P surface. To improve film quality, we add a co-surfactant to the GMO in a mass ratio of 1:10; when this co-surfactant is cetyltrimethylammonium bromide, we find an unusually large pore size (8-12 nm) in acid extracted films, while UV/O(3) treated films yield pores of only ca. 4 nm. Using this pore size dependence on film processing procedure, we create a simple method for patterning pore size in nanoporous films, demonstrating spatially-defined size-selective molecular adsorption.
authors.affiliation: University of New Mexico/NSF Center for Micro-Engineered Materials, Department of Chemical and Nuclear Engineering, Albuquerque, NM 87131.
authors.forename: Darren R
authors.initials: DR
authors.lastname: Dunphy
authors.forename: Fred L
authors.initials: FL
authors.lastname: Garcia
authors.forename: Bryan
authors.initials: B
authors.lastname: Kaehr
authors.forename: Constantine Y
authors.initials: CY
authors.lastname: Khripin
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Collord
authors.forename: Helen K
authors.initials: HK
authors.lastname: Baca
authors.forename: Michael P
authors.initials: MP
authors.lastname: Tate
authors.forename: Hugh W
authors.initials: HW
authors.lastname: Hillhouse
authors.forename: Joseph W
authors.initials: JW
authors.lastname: Strzalka
authors.forename: Zhang
authors.initials: Z
authors.lastname: Jiang
authors.forename: Jin
authors.initials: J
authors.lastname: Wang
authors.forename: C Jeffrey
authors.initials: CJ
authors.lastname: Brinker