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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Hierarchical porous materials: Internal structure revealed by argon ion-beam cross-section polishing, HRSEM and AFM
Sam M. Stevens,Sam M. Stevens,Adonay R. Loiola,Pablo Cubillas,Lindomar Roberto Damasceno da Silva,Osamu Terasaki,Osamu Terasaki,Michael W. Anderson +7 more
TL;DR: In this paper, high-resolution scanning electron microscopy coupled with argon ion-beam cross-section polishing and atomic force microscopy were used to reveal details about the interconnectivity of meso- and macroporous networks in silica hierarchical porous material.
Journal ArticleDOI
Nitrocellulose templated hierarchical pore structure in mesoporous thin films
TL;DR: In this paper, a method for templating the pore structure in mesoporous ceramic oxide thin films is described. But this method is not suitable for the case of thin films.
Journal ArticleDOI
Fine-structured patterns of porous alumina material fabricated by a replication method
Hong-Dae Kim,Tadachika Nakayama,Byung Jin Hong,Kazuyoshi Imaki,Takeshi Yoshimura,Tsuneo Suzuki,Hisayuki Suematsu,Koichi Niihara +7 more
TL;DR: In this paper, porous alumina materials with three-dimensional fine-patterning over multiple length scales were fabricated from mixed slurry of polyvinyl alcohol and alumina nanosized particles in water by a replication method.
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Substitution features in the isomorphous replacement series for metal-organic compounds (NbxTa1−x)4O2(OMe)14(ReO4)2, x=0.7, 0.5, 0.3—Single-source precursors of complex oxides with organized porosity
TL;DR: In this paper, the authors considered the centrosymmetric molecules (I) and (III) as a product of condensation of two M2(OMe)9(OReO3) molecules with the formation of two oxo-bridges.
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Self-assembly of carbon nanotube polyhedrons inside microchannels
TL;DR: Well-defined carbon polyhedrons with faceted morphologies and hollow internal structures made of self-organized multi-walled carbon nanotubes have been fabricated by gas phase catalytic CVD inside microchannels that show superhydrophobic properties.
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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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.