title: Colloidal crystal layers of hexagonal nanoplates by convective assembly.
abstract: Particles of the zeolite ZSM-2 prepared as nearly hexagonal nanoplatelets were coated onto flat substrates by a convective assembly technique. On the submillimeter scale, coatings ranged in patterns from striped to continuous. Particles were preferentially oriented out-of-plane, as supported by X-ray diffractometry. The novel observation is that where the particle coating was only a monolayer thick, particles were locally close-packed and uniformly oriented both in and out of plane in a hexagonal colloidal crystalline arrangement that may be described as being tiled (observations by scanning electron microscopy). This is the first documented demonstration of convective assembly applied to anisometric nanoparticles that resulted in particulate coatings with locally ordered microstructure, i.e., colloidal crystallinity.
authors.affiliation: Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455-0132, USA.
authors.forename: J Alex
authors.initials: JA
authors.lastname: Lee
authors.forename: Linli
authors.initials: L
authors.lastname: Meng
authors.forename: David J
authors.initials: DJ
authors.lastname: Norris
authors.forename: L E
authors.initials: LE
authors.lastname: Scriven
authors.forename: Michael
authors.initials: M
authors.lastname: Tsapatsis