Synthesis of a Stable Hexagonally Packed Mesoporous Niobium Oxide Molecular Sieve Through a Novel Ligand‐Assisted Templating Mechanism

Antonelli, David M.; Ying, Jackie Y.

doi:10.1002/anie.199604261

Cited by 438 publications

(255 citation statements)

References 15 publications

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“…1,2 Due to the large field of applications ranging from (photo)catalysis to ceramics, zirconia is of particular interest among the non-silica mesoporous oxides. Zirconium oxide has been found to have applications in the field of redox and acid catalysis.…”

Section: Introductionmentioning

confidence: 99%

Controlled formation of amine-templated mesostructured zirconia with remarkably high thermal stability

et al. 2003

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In order to control the reactivity of the inorganic precursor and the hybrid formation, the evaporation induced self-assembly procedure (EISA) has been applied to direct alkyl amines into zirconia hybrid composites. It is demonstrated that, with controlled water amounts, a mesostructured wormhole-like high-surface-area zirconia can be formed but the mesostructure collapses due to massive crystallisation of the zirconia walls into tetragonal zirconia as the calcination temperature rises to 400 uC. To overcome the lack in thermal stability, zirconia hybrids are treated in aqueous ammonia to protect the primary particles in the zirconia walls against uncontrolled particle growth and crystallisation. The growth of the initially amorphous zirconia particles in the walls is limited by increasing the condensation degree upon ammonia treatment resulting in mesostructured zirconia consisting of nanosized 'tetragonal' particles at higher temperatures. It is shown that the alkalinetreated zirconias have a remarkable thermal stability with retention of most physical characteristics such as high surface area, pore volume and mesoporosity up to a temperature of 800 uC.

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Section: Introductionmentioning

confidence: 99%

Controlled formation of amine-templated mesostructured zirconia with remarkably high thermal stability

et al. 2003

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“…Transitional metal containing materials are more commonly known and these are typically first or second raw transition metals (d-block elements of the periodic table) with other accounts involving the lanthanides. Most of the surfactants that fall under the transition metal category contain one or more of elements including Scandium (Sc) [7], Titanium (Ti) [8]- [10], Vanadium (V) [10] [11], Chromium (Cr) [9], Iron (Fe) [12] [13], Cobalt (Co) [14], Nickel (Ni) [15], Copper (Cu) [16], Zinc Zn [17], Yttrium (Y) [9], Zirconium (Zr) [8] [18] [19], Niobium (Nb) [20], Palladium (Pd) [15], Silver (Ag) [6], Lanthanum (La), Europium (Eu), Gadolinium (Gd), Ytterbium (Yb) [21], Hafnium (Hf) [8] and Osmium (Os) [22]. Similarly, there are a number of reports on non-transition metal-based organometallic surfactants.…”

Section: Compositionmentioning

confidence: 99%

“…It was produced from a long chain amine and a Niobium salt. Water was used in the preparation process and the precipitate was aged for a week under high temperature that resulted into a white powder that was successfully characterised [20]. It should be noted that some reactions can require the use of inert atmosphere such as those reported by Kim et al (2003) where a Palladium surfactant was produced from a surfactant precursor in a tioctylphosphine reagent [37].…”

Section: Preparation and Characterisationmentioning

confidence: 99%

Properties, Characterizations and Applications of Organometallic Surfactants—A Review

Magami¹,

Garba²,

Ibrahim

2015

MSCE

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This review focuses on organometallic surfactant frameworks considering their wide applications. Organometallic surfactants have grown from being used as dewaxers in complex industrial processes to the production of nanoparticles and for use in many drug delivery applications. Their properties such as self assembly, forming supramolecular structures are outstanding, providing for their myriad industrial usage. In this review, an account of properties, preparation techniques, characterisation techniques and uses of organometallic surfactants are covered.

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“…Furthermore, it is possible to synthesize mesoporous structures of the materials other than silica. Methodology to prepare mesoporous silica via the template synthesis is extended to preparation of a various mesoporous metal oxides [46][47][48][49][50][51][52][53][54][55][56][57][58][59] such as TiO 2 , Ta 2 O 5 , Nb 2 O 5 , ZrO 2 , Al 2 O 3 , and V 2 O 5 as well as synthesis of mesoporous aluminophosphate [60][61][62][63].…”

Section: Introductionmentioning

confidence: 99%

New families of mesoporous materials

Vinu

Mori

Ariga

2006

Science and Technology of Advanced Materials

167

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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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Synthesis of a Stable Hexagonally Packed Mesoporous Niobium Oxide Molecular Sieve Through a Novel Ligand‐Assisted Templating Mechanism

Cited by 438 publications

References 15 publications

Controlled formation of amine-templated mesostructured zirconia with remarkably high thermal stability

Controlled formation of amine-templated mesostructured zirconia with remarkably high thermal stability

Properties, Characterizations and Applications of Organometallic Surfactants—A Review

New families of mesoporous materials

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