Preparation by microwave irradiation of nanometre-sized AlPO4-5 molecular sieve

Du, Hong‐Bin; Fang, Min; Xu, Wei; Meng, Xiangbao; Pang, Wenqin

doi:10.1039/a606132j

Cited by 44 publications

(25 citation statements)

References 13 publications

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“…2 illustrate SAPO-5 prepared from the reaction gels of Al 2 O 3 :2P 2 O 5 :0.2SiO 2 :1.5TEA:750H 2 O aged, with stirring, for various amounts of time (4-24 h), and heated at 190°C for 1 h. To keep the pH value of the synthesis mixture at near neutral, the mole ratio of the Al 2 O 3 /P 2 O 5 was fixed at 1:2 throughout all conditions. It was found that smaller and more uniform SAPO-5 crystals were formed at prolonged aging time, owing to the higher number of nucleation centers created by the agitation of the gel, as discussed by Du and coworkers [31]. A further increase in the aging time to 24 h produced crystals that were still smaller in size, but which had less homogeneity than those aged for 16 h. Moreover, the XRD patterns (Fig.…”

Section: Effect Of Aging Timementioning

confidence: 89%

Effect of synthesis parameters on mesoporous SAPO-5 with AFI-type formation via microwave radiation using alumatrane and silatrane precursors

Utchariyajit

Wongkasemjit

2010

Microporous and Mesoporous Materials

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Section: Effect Of Aging Timementioning

confidence: 89%

Effect of synthesis parameters on mesoporous SAPO-5 with AFI-type formation via microwave radiation using alumatrane and silatrane precursors

Utchariyajit

Wongkasemjit

2010

Microporous and Mesoporous Materials

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“…Du et al [77] determined that a broader range of precursor mixture conditions could be used in MW synthesis compared to CH, to produce AlPO 4 -5 crystals and the crystals were typically of smaller size.…”

Section: Aluminophosphatesmentioning

confidence: 99%

Microwave Synthesis of Nanoporous Materials

2006

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Studies in the last decade suggest that microwave energy may have a unique ability to influence chemical processes. These include chemical and materials syntheses as well as separations. Specifically, recent studies have documented a significantly reduced time for fabricating zeolites, mixed oxide and mesoporous molecular sieves by employing microwave energy. In many cases, microwave syntheses have proven to synthesize new nanoporous structures. By reducing the times by over an order of magnitude, continuous production would be possible to replace batch synthesis. This lowering of the cost would make more nanoporous materials readily available for many chemical, environmental, and biological applications. Further, microwave syntheses have often proven to create more uniform (defect-free) products than from conventional hydrothermal synthesis. However, the mechanism and engineering for the enhanced rates of syntheses are unknown. We review the many studies that have demonstrated the enhanced syntheses of nanoporous oxides and analyze the proposals to explain differences in microwave reactions. Finally, the microwave reactor engineering is discussed, as it explains the discrepancies between many microwave studies.

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“…Single crystals with nearly perfect morphology were grown using hydrofluoric acid [15]. With a specially prepared and aged aluminum hydroxide gel crystal sizes around 1 mm in caxis direction were obtained [16], whereas microwave heating proved to increase the crystallization rates by more than one order of magnitude [15,17].…”

Section: Host Crystalmentioning

confidence: 99%

Hexagonal microlasers based on organic dyes in nanoporous crystals

Braun

Ihlein

Laeri

et al. 2000

Applied Physics B: Lasers and Optics

137

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Molecular sieves, such as nanoporous AlPO4-5, can host a wide variety of laser active dyes. We embedded pyridine 2 molecules as a representative of a commercially available dye which fits into the channel pores of the host matrix. Many efficient dye molecules, such as rhodamines, do not fit into the pores. But modifying the structure of the dyes to appear like the used templates allows to increase the amount of encapsulated dyes. The properties of resulting microlasers depend on size and shape of the microresonators, and we discuss a model for microscopic hexagonal ring resonators. In terms of pump needed to reach lasing threshold molecular sieve microlasers are comparable to VCSELs. For dyes which fit into the pores we observed a partial regeneration of photo-induced damage.

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Preparation by microwave irradiation of nanometre-sized AlPO4-5 molecular sieve

Cited by 44 publications

References 13 publications

Effect of synthesis parameters on mesoporous SAPO-5 with AFI-type formation via microwave radiation using alumatrane and silatrane precursors

Effect of synthesis parameters on mesoporous SAPO-5 with AFI-type formation via microwave radiation using alumatrane and silatrane precursors

Microwave Synthesis of Nanoporous Materials

Hexagonal microlasers based on organic dyes in nanoporous crystals

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