A Condensable Amphiphile with a Cleavable Tail as a “Lizard” Template for the Sol−Gel Synthesis of Functionalized Mesoporous Silica

Zhang, Qingmin; Ariga, Katsuhiko; Okabe, Akihiro; Aida, Takuzo

doi:10.1021/ja039515r

Cited by 147 publications

(113 citation statements)

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“…Organotrialkoxysilanes containing a dimethyl ammonium group as a part of the head group have been reported to generate two-dimensional (2-D) hexagonal and cubic phases in the presence of tetraalkoxysilanes. 20,36,37 However, the synthesis of such mesophases using organosilane precursors having simple hydrocarbon chains still remains a challenge. Recently, the formation of a 2-D hexagonal hybrid from bis(trimethoxysilyl)alkane with a long alkylene spacer was reported.…”

Section: Other Hybrid Mesostructures Obtained By Molecular Designmentioning

confidence: 99%

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

2006

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This paper reports on recent progress in the synthesis of nanostructured siloxane-organic hybrids based on the self-assembly of amphiphilic silicon-based precursors. A variety of ordered hybrid materials have been obtained by molecular design of the precursors. Alkoxysilanes and chlorosilanes with covalently attached hydrophobic organic tails are hydrolyzed to form amphiphilic molecules containing silanol groups, leading to the formation of layered (lamellar) structures. Transparent and oriented thin films of lamellar hybrids were prepared by the reaction in the presence of tetraalkoxysilane. In addition, the design of molecules having alkyl chains and large oligosiloxane heads led to the formation of mesophases consisting of cylindrical assemblies, providing a direct pathway to ordered porous silica. The synthesis, structural features, and formation processes of these hybrid mesostructures are discussed.

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Section: Other Hybrid Mesostructures Obtained By Molecular Designmentioning

confidence: 99%

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

2006

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“…331 The organosilane including alanine residue was covalently attached to the silica framework upon solgel reaction with tetraethoxysilane and cleavage and removal of the alkyl tail by selective hydrolysis of the ester at the C-terminal leaves open pores with a surface covalently functionalized by the alanine residue. As one can easily imagine, the template behaves like a "lizard," whose head bites the silica wall and whose tail can be cleaved off.…”

Section: +mentioning

confidence: 99%

Nanoarchitectonics for Mesoporous Materials

Ariga

Vinu

Yamauchi

et al. 2011

Bulletin of the Chemical Society of Japan

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707

408

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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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“…16) [204][205][206]. A surfactant with condensable alkoxysilane group was used as template in this method.…”

Section: Biomaterial-hybridized Mesoporous Materialsmentioning

confidence: 99%

New families of mesoporous materials

Vinu

Mori

Ariga

2006

Science and Technology of Advanced Materials

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164

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Mesoporous materials have been paid much attention in both scientific researches and practical applications. In this review, we focus on recent developments on preparation and functionalization of new families of mesoporous materials, especially non-siliceous mesoporous materials invented in our research group. Replica synthesis is known as the method to synthesize mesoporous materials composed of various elements using originally prepared mesoporous replica. This strategy has been applied for the syntheses of novel mesoporous materials such as carbon nanocage and mesoporous carbon nitride. Carbon nanocage has a cage-type structure with huge surface area and pore volume, which exhibits superior capabilities for biomolecular adsorption. Mesoporous carbon nitride was synthesized, for first time, by using mixed material source of carbon and nitrogen simultaneously. As a totally new strategy for synthesis of mesoporous materials, the elemental substitution method has been recently proposed by us. Direct substitution of component elements in original mesoporous materials, with maintaining structural regularity, provided novel mesoporous materials. According to this synthetic strategy, mesoporous boron nitride and mesoporous boron carbon nitride have been successfully prepared, for first time. In addition to these material inventions, hybridization of high functional materials, such as biomaterials, to mesoporous structure has been also developed. Especially, immobilization of proteins in mesopores was systematically researched, and preparation of peptidehybridized mesoporous silica was demonstrated. These new families of mesoporous materials introduced in this review would have high potentials in future practical applications in wide ranges from electronics and photonics to environmental and medical uses. r

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A Condensable Amphiphile with a Cleavable Tail as a “Lizard” Template for the Sol−Gel Synthesis of Functionalized Mesoporous Silica

Cited by 147 publications

References 9 publications

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

Designed synthesis of nanostructured siloxane–organic hybrids from amphiphilic silicon-based precursors

Nanoarchitectonics for Mesoporous Materials

New families of mesoporous materials

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