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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Self‐organized colloidal crystals for photonics and laser applications
TL;DR: An overview of recent developments in the fabrication and uses of colloidal crystals (CCs) for photonics and laser applications can be found in this paper, where interesting precedents not only of diverse techniques of high-quality CC structures, but also of their versatile applications in optical sensors responding to various external stimuli.
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Chemical phase separation strategies towards silica monoliths with hierarchical porosity.
TL;DR: In this tutorial review the preparation of monolithic silica materials with hierarchical porosity by the competing processes of sol-gel transition and chemical phase separation is summarized.
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Thioether‐bridged Mesoporous Organosilicas: Mesophase Transformations Induced by the Bridged Organosilane Precursor
TL;DR: In this article, the mesoporous materials have been synthesized by co-condensation of bis[3-(triethoxysilyl)propyl]tetrasulfide (TESPTS) and tetramETHoxysilane (TMOS) in acetic acid/sodium acetate buffer solution (HAc-NaAc, pH 4.4).
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Surfactant-assisted synthesis of unprecedented hierarchical meso-macrostructured zirconia
TL;DR: A surfactant-assisted one-step synthesis route was developed, leading to the formation of a very high surface area (600 m2 g−1) of zirconia and unprecedented hierarchical meso-macroporous structure with wormhole-like mesoporous walls and a novel, uniform assembly of macropores ranging in size from 300 to 500 nm as mentioned in this paper.
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Periodically mesostructured silica monoliths from diol-modified silanes
TL;DR: In this paper, a novel pathway to hierarchically porous silica monoliths with macropores in the range of 200−800 nm and periodically arranged mesopores with a repeating unit distance of 11 nm is presented by an ethylene glycol-modified silane as inorganic precursor in the presence of an amphiphilic block copolymer as a structure-directing agent in purely aqueous solution.
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
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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.