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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Percolation transition in the porous structure of latex-templated silica monoliths
François Guillemot,A. Brunet-Bruneau,Elodie Bourgeat-Lami,Jean-Pierre Boilot,Etienne Barthel,Thierry Gacoin +5 more
TL;DR: In this paper, the pore-structure of the calcined pellets is investigated through nitrogen adsorption to assess the evolution of the porosity when varying the amount of porogen.
Journal ArticleDOI
Mesopore constrictions derived from the substitutionally co-packed SBA-15
TL;DR: In this article, a highly ordered, substitutionally co-packed, bimodal hexagonal mesoporous silica, ORK-1, with a dual mesopore/constriction size distribution has been synthesized successfully by the co-packing of two different copolymer micelles (amphiphilic triblock copolymers) in strong acid media.
Journal ArticleDOI
Investigation of self-assembled fractal porous-silica over a wide range of length scales using a combined small-angle scattering method
TL;DR: In this paper, the unique structure of a set of self-assembled porous silica materials was characterized through a combined small-angle scattering (CSAS) method using small-and ultra-small angle neutron scattering as well as smallangle X-ray scattering.
Patent
Organosilicate materials with mesoscopic structures
Cheng-Hsuan Chen,Shu Yang +1 more
TL;DR: Template-based methods fabricate organosilicate materials with mesoscopic structures as discussed by the authors, which include providing solutions of amphiphilic template molecules, mixing amphiphilic organosilic organosILicate precursors into the solutions to form mixtures, and evaporating solvent from the mixtures.
Journal ArticleDOI
One-pot synthesis of hierarchically macro/mesoporous Al2O3 monoliths from a facile sol–gel process
TL;DR: Based on the preparation of ordered mesoporous Al2O3 powder using P123/isopropoxide aluminum/HNO3 reaction system, hierarchically macro/mesoporous alumina monoliths were successfully fabricated by introducing PEG8000 as the phase-segregation initiator to generate macropores as discussed by the authors.
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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Journal ArticleDOI
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.