Hierarchically ordered oxides
Peidong Yang,Tao Deng,Dongyuan Zhao,Pingyun Feng,David J. Pine,Bradley F. Chmelka,George M. Whitesides,Galen D. Stucky +7 more
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TLDR
Porous silica, niobia, and titania with three-dimensional structures patterned over multiple length scales were prepared by combining micromolding, polystyrene sphere templating, and cooperative assembly of inorganic sol-gel species with amphiphilic triblock copolymers.Abstract:
Porous silica, niobia, and titania with three-dimensional structures patterned over multiple length scales were prepared by combining micromolding, polystyrene sphere templating, and cooperative assembly of inorganic sol-gel species with amphiphilic triblock copolymers. The resulting materials show hierarchical ordering over several discrete and tunable length scales ranging from 10 nanometers to several micrometers. The respective ordered structures can be independently modified by choosing different mold patterns, latex spheres, and block copolymers. The examples presented demonstrate the compositional and structural diversities that are possible with this simple approach.read more
Citations
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Micropatterned lead zirconium titanate thin films
TL;DR: Micropatterning of Pb(Zr0.52Ti0.48)O-3 thin films with line features as small as 350 nm was demonstrated through capillary molding of organometallic solutions within the continuous channels of an elastomeric mold.
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Functional Composite Membranes Based on Mesoporous Silica Spheres in a Hierarchically Porous Matrix
Fan Li,Andreas Stein +1 more
TL;DR: In this article, mesoporous silica spheres decorated with organic probe molecules for visual Cd2+ ion detection were coated with a thin protecting poly(methyl methacrylate) (PMMA) layer to form core−shell particles.
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Hydrazine reduction of metal ions to porous submicro-structures of Ag, Pd, Cu, Ni, and Bi
TL;DR: In this paper, the reduction of hydrazine in glycerol-ethanol solution at room temperature or 120-180°C has been shown to yield the second largest surface area.
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Preparation of 3D ordered mesoporous anatase TiO2 and their photocatalytic activity
TL;DR: In this article, ordered crystalline mesoporous anatase titanium dioxides with different amounts of rutile were prepared by hard-template approaches using mesoporus silica (KIT-6) as the template and characterized by powder X-ray diffraction, transmission electron microscope (TEM), N2 adsorption and Raman spectroscopy.
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Synthesis of porous microspheres via self-assembly of monodisperse polymer nanospheres
TL;DR: In this paper, the self-assembly of pre-formed monodisperse poly(styrene-co-methacrylic acid) latex particles is performed in suspension in toluene and is driven by the removal of water at ca. 105 °C. This thermal process also induces contact fusion of the latex particles.
References
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Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism
TL;DR: In this paper, the synthesis of mesoporous inorganic solids from calcination of aluminosilicate gels in the presence of surfactants is described, in which the silicate material forms inorganic walls between ordered surfactant micelles.
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Triblock copolymer syntheses of mesoporous silica with periodic 50 to 300 angstrom pores
Dongyuan Zhao,Jianglin Feng,Qisheng Huo,Nicholas A. Melosh,Glenn H. Fredrickson,Bradley F. Chmelka,Galen D. Stucky +6 more
TL;DR: Use of amphiphilic triblock copolymers to direct the organization of polymerizing silica species has resulted in the preparation of well-ordered hexagonal mesoporous silica structures (SBA-15) with uniform pore sizes up to approximately 300 angstroms.
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TL;DR: In this article, a simple and versatile procedure for the synthesis of thermally stable, ordered, large-pore (up to 140 A) mesoporous metal oxides was described.
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Synthesis of Macroporous Minerals with Highly Ordered Three-Dimensional Arrays of Spheroidal Voids
TL;DR: The examples presented demonstrate the compositional diversity possible with this technique and could have applications in areas ranging from quantum electronics to photocatalysis to battery materials.