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
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Hierarchically ordered nanoporous Pd/SBA-15 catalyst for the aerobic selective oxidation of sterically challenging allylic alcohols
Christopher M. A. Parlett,Christopher M. A. Parlett,Pooja Keshwalla,Stephen G. Wainwright,Duncan W. Bruce,Nicole Hondow,Karen Wilson,Karen Wilson,Adam F. Lee +8 more
TL;DR: The utility of a hierarchically ordered nanoporous SBA-15 architecture, comprising 270 nm macropores and 5 nm mesopores, for the catalytic aerobic selective oxidation of sterically challenging allylic alcohols is shown in this paper.
Journal ArticleDOI
Morphosynthesis of macrocellular mesoporous silicate foams
TL;DR: In this paper, a set of open-cell macrovoid structures were constructed from continuous metastable foams of non-ionic alkylpolyethylene oxide surfactants under aqueous, neutral pH condition.
Journal ArticleDOI
High‐resolution imaging of nanoparticle bimetallic catalysts supported on mesoporous silica
Dogan Ozkaya,Wuzong Zhou,John Meurig Thomas,John Meurig Thomas,Paul A. Midgley,Vicki J. Keast,Sophie Hermans +6 more
TL;DR: Using high-angle annular dark field imaging (either in a 100 or 300 keV STEM system) was used to locate precisely individual bimetallic nanoparticles (Ag3Ru10, Cu4Ru12 and Pd6Ru6 hydrogenation catalysts) supported on mesoporous silica, to determine their size distribution, and to record their characteristic X-ray emission maps.
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Nanocasting nanoporous inorganic and organic materials from polymeric bicontinuous microemulsion templates
Brad H. Jones,Timothy P. Lodge +1 more
TL;DR: In this paper, a suite of nanoporous materials with well-defined pore structures are presented, including high-temperature ceramic, polymeric thermosets and a conducting polymer, which are produced by a simple nanocasting process.
Journal ArticleDOI
Micromachining of mesoporous oxide films for microelectromechanical system structures
TL;DR: In this article, mesoporous SiO 2 and Al 2 O 3 films were prepared by spin coating using block copolymers as the structuredirecting agents and the resulting films were over 50% porous with uniform pores of 8-nm average diameter and an extremely smooth surface.
References
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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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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.