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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Controlling the shape and alignment of mesopores by confinement in colloidal crystals: designer pathways to silica monoliths with hierarchical porosity.
TL;DR: Structural and textural properties of the monoliths are described in detail as a function of the synthesis parameters, including the relative dimensions of the mesostructures with respect to the interstitial space in the latex template, interfacial interactions, entropic effects, and structural frustration.
Journal ArticleDOI
Well-Defined Hierarchical Templates for Multimodal Porous Material Fabrication
Bo Zhao,Maryanne M. Collinson +1 more
TL;DR: In this article, a hierarchical template with raspberry-like and strawberry-like features was made by synthetically joining appropriately functionalized commercially available polystyrene (PS) latex spheres together.
Journal ArticleDOI
Enhanced electrorheological activity of mesoporous Cr-doped TiO2 from activated pore wall and high surface area.
Jian B. Yin,Xiao P. Zhao +1 more
TL;DR: The dielectric spectra analysis showed that the mesoporous Cr-doped TiO2 ER suspension possessed a significantly larger interfacial polarizability compared with the nonporous Cr- dopedTiO 2 ER suspension, and the regular change of polarIZability with surface area or porosity was in accordance with the change of ER activity with surface Area or Porosity.
Journal ArticleDOI
Dual Templating Synthesis of Mesoporous Titanium Nitride Microspheres
Jin Ho Bang,Kenneth S. Suslick +1 more
TL;DR: In this paper, the authors gratefully acknowledge Prof. W. Kriven and J. M. Bell for their generous assistance in TGA/DSC data acquisition, which was carried out in part in the Center for Microanalysis of Materials, UIUC, which is partially supported by the U.S. Department of Energy under grant DE-FG02-07ER46418.
Journal ArticleDOI
Hierarchically structured functional materials: Synthesis strategies for multimodal porous networks
TL;DR: In this paper, a review of the recent progress in the synthesis of hierarchically porous materials, targeted through templating methods, is reviewed, which involves a supermolecular assembly of amphiphilic polymers or surfactants combined with second surfactant systems or macrotemplates such as solid particles, liquid drops, and air bubbles.
References
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Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism
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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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Generalized syntheses of large-pore mesoporous metal oxides with semicrystalline frameworks
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.