Structural Control of Phenylene-bridged Periodic Mesoporous Organosilica with Organic Additives

Fukuoka, Ayumu; Hoshikawa, Yasuto; Shimojima, Atsushi; Okubo, Tatsuya

doi:10.1246/cl.2009.1026

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…In particular, the framework composition that governs the properties of mesoporous materials has been studied most extensively. Mesoporous materials now include a variety of framework compositions, such as metal oxides, 9)11) carbon compounds, 12)14) inorganicorganic hybrid materials, 15), 16) and metals. 17) Recently, mesoporous transition-metal oxides have attracted much interest in a wide range of applications due to their unique chemical and physical properties, such as high surface area, controlled pore size and narrow distribution of pore size.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous Nb2O5 with crystalline walls and investigation of their photocatalytic activity

Suzuki

Athar

Huang

et al. 2011

J. Ceram. Soc. Japan

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We synthesize various kinds of mesoporous Nb 2 O 5 samples by changing surfactants (P123 and Brij 56), followed by calcination (from 400 to 500 and 600°C). The effect of these parameters helps to produce a well-defined mesoporous framework with crystallinity. The mesoporous Nb 2 O 5 samples are well characterized by using small-angle X-ray scattering (SAXS) measurements, N 2 adsorptiondesorption isotherms, and wide-angle XRD measurements. In a P123 system, the frameworks are well crystallized to the TT-phase (pseudo-hexagonal) by calcination at 500°C with retention of the mesoporous structures. In the Brij 56 system, after calcination at 500°C, the framework is well retained in an amorphous state. It is proved that the thick walls prepared with P123 are easily crystallized in comparison to thin walls prepared with Brij 56. Furthermore, we investigate the photocatalytic activity by using several types of mesoporous Nb 2 O 5 prepared with P123. All these mesoporous Nb 2 O 5 samples show photocatalytic activity with their decomposition reaction of methylene blue (MB) molecules. It is concluded that the reaction rates depend on their crystallinities in the frameworks, surface areas, and average mesopore sizes.

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Section: Introductionmentioning

confidence: 99%

Synthesis of mesoporous Nb2O5 with crystalline walls and investigation of their photocatalytic activity

Suzuki

Athar

Huang

et al. 2011

J. Ceram. Soc. Japan

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Effect of organic groups on hydrogen adsorption properties of periodic mesoporous organosilicas

Kubo¹,

Ishiyama²,

Shimojima³

et al. 2012

Microporous and Mesoporous Materials

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Nanoarchitectonics for Mesoporous Materials

Ariga

Vinu

Yamauchi

et al. 2011

Bulletin of the Chemical Society of Japan

716

411

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Although mesoporous materials have well-defined pore structures, these fine materials can surprisingly be produced by employing a set of conventional and simple procedures such as mixing, heating, filtration, and washing, using low-cost materials. They can be regarded as easy-to-make bulk nanostructured materials. Mesoporous materials have great potential for use in both macroscopic applications and nanotechnology. In this account, we introduce examples of recent developments in mesoporous materials involving innovations in their components and structural designs and concentrating on our own recent progress. These examples include syntheses of mesoporous silica, metal oxides, semiconductive materials, metals, alloys, organic composites, biomaterial composites, carbon, carbon nitride, and boron nitride, as innovative components. As structural innovations for mesoporous materials, various film preparations, pore alignments, and hierarchic structures are described together with their related functions including sensing and controlled release of target molecules. Why Mesoporous Materials? Bulk Quantities and Precise StructuresThere is little doubt that nanotechnology and related technologies are making significant contributions to current research and development which will eventually be felt in our day-to-day lives. Device miniaturization in such products as cellular phones and portable computers has irrevocably changed our lifestyles. Portable devices allow us to work and communicate wherever we are in the world in contrast to the previous situation where machine operation required a human presence. Greater freedom in our work and leisure dispositions should diminish over-concentration of populations in cities and may ultimately reduce energy consumption and waste production.So far, device innovations have been due to development of top-down approaches, especially sophisticated microfabrication techniques. 17 However, those top-down techniques are not useful for materials innovation where chemical processes are used as the operating principle. Rather, so-called bottom-up approaches are expected to create novel functional materials having well-controlled structural features with nanometric precision. Bottom-up approaches rely on self-assembly processes to form selected structures through spontaneous association of atoms, molecules, clusters, and particles. 818 Furthermore, assisted assembly techniques using external influences are provided by LangmuirBlodgett (LB) method 1928 and layer-by-layer (LbL) adsorption 2936 and provide significant contributions for materials' fabrication. According to these concepts, molecular complex formation, 3741 molecular array control, 4252 and microscopic structural design 5361 have been widely investigated leading to generation of a large quantity of scientific knowledge.Ideally, materials should be produced in a series of easy processes to yield bulk quantity without loss of nanometric structural features and some categories of material already satisfy this condition. For exampl...

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Structural Control of Phenylene-bridged Periodic Mesoporous Organosilica with Organic Additives

Cited by 3 publications

References 19 publications

Synthesis of mesoporous Nb2O5 with crystalline walls and investigation of their photocatalytic activity

Synthesis of mesoporous Nb2O5 with crystalline walls and investigation of their photocatalytic activity

Effect of organic groups on hydrogen adsorption properties of periodic mesoporous organosilicas

Nanoarchitectonics for Mesoporous Materials

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