Synthesis of zeolite beta in presence of fluorides: Influence of alkali cations

Mostowicz, R.; Testa, Flaviano; Crea, F.; Aiello, R.; Fonseca, A.; Nagy, J.B.

doi:10.1016/s0144-2449(97)00001-8

Cited by 43 publications

(29 citation statements)

References 28 publications

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“…The XRD of the three zeolites synthesized with different conditions is shown in Figure 4, indicating that the pure phase was obtained. These XRD patterns show, simultaneously, broad and sharp peaks, indicating the highly disordered structure present, typical of these kinds of materials [13]. The characteristic peaks at 2 θ = 7.8° and 22.5°, assigned to (001) and (302) planes, respectively [14], are observed.…”

Section: Resultsmentioning

confidence: 99%

Infuence of Microstructure in Drug Release Behavior of Silica Nanocapsules

González

Sagarzazu

Zoltan

2013

Journal of Drug Delivery

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Meso- and nanoporous structures are adequate matrices for controlled drug delivery systems, due to their large surface areas and to their bioactive and biocompatibility properties. Mesoporous materials of type SBA-15, synthesized under different pH conditions, and zeolite beta were studied in order to compare the different intrinsic morphological characteristics as pore size, pore connectivity, and pore geometry on the drug loading and release process. These materials were characterized by X-ray diffraction, nitrogen adsorption, scanning and transmission electron microscopy, and calorimetric measurements. Ibuprofen (IBU) was chosen as a model drug for the formulation of controlled-release dosage forms; it was impregnated into these two types of materials by a soaking procedure during different periods. Drug loading and release studies were followed by UV-Vis spectrophotometry. All nano- and mesostructured materials showed a similar loading behavior. It was found that the pore size and Al content strongly influenced the release process. These results suggest that the framework structure and architecture affect the drug adsorption and release properties of these materials. Both materials offer a good potential for a controlled delivery system of ibuprofen.

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Section: Resultsmentioning

confidence: 99%

Infuence of Microstructure in Drug Release Behavior of Silica Nanocapsules

González

Sagarzazu

Zoltan

2013

Journal of Drug Delivery

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“…It is well known that addition of fluorides such as HF, NH 4 F and NaF into the starting synthesis gel favors synthesis of high-silica [32][33][34][35][36][37][38][39][40] and large zeolites [41,42]. The F anions in the gel have been considered to act as a mineralizing agent and/or a structure-directing agent.…”

Section: Synthesis Of Large Mor Zeolite Crystalsmentioning

confidence: 99%

Convenient synthesis of large mordenite crystals

Lu¹,

Oumi²,

Sano³

2006

Journal of Crystal Growth

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“…Like other high silica zeolite, however, it requires organic template. Various organic templates such as tetraethylammonium hydroxide (TEAOH) [1,[4][5][6][7][8][9][10][11][12][13][14][15][16], dibenzyl 1,4-diazabicyclo [2.2.2]octane [17,18] [19,20] and dibenzyl dimethylammonium cation [21] have been reported. In addition, various co-templating systems, such as TEAOH and TEABr [22], TEAOH and TEAF [23], TEABr and seed [24], TEABr, diethanolamine and seed [25], TEABr, triethanolamine and TEAOH [26], TEABr, NH 4 [27], etc.…”

Section: Introductionmentioning

confidence: 99%