Characterization of Zeolite L Nanoclusters

Tsapatsis, Michael; Lovallo, Mark; Okubo, Tatsuya; Davis, Mark E.; Sadakata, Masayoshi

doi:10.1021/cm00057a025

Cited by 157 publications

(99 citation statements)

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“…[22,23] Increasing effort has been focused on nanosized zeolite for a variety of reasons. [24][25][26][27][28] Embedding nanosized ZL (NZL) in polymer matrices results in transparent hybrid materials. [28][29][30] Films prepared with them typically exhibit high mechanical and chemical stability.…”

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confidence: 99%

“…[24][25][26][27][28] Embedding nanosized ZL (NZL) in polymer matrices results in transparent hybrid materials. [28][29][30] Films prepared with them typically exhibit high mechanical and chemical stability. A combination of the characteristics of such films with the luminescence properties of Ln 3+ complexes is thought to be important for developing novel optical devices.…”

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confidence: 99%

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Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

Wang

et al. 2014

Angew Chem Int Ed

106

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Stopper molecules attached to nanozeolite L (NZL) boost the luminescence of confined Eu(3+)-β-diketonate complexes. The mechanism that is responsible was elucidated by comparing two diketonate ligands of different pK(a) and two aromatic imines, and by applying stationary and time resolved spectroscopy. The result is that the presence of the imidazolium based stopper is favorable to the sustainable formation of Eu(3+)-β-diketonate complexes with high coordination by decreasing the proton strength inside the channels of NZL. A consequence is that strongly luminescent transparent films can be prepared using aqueous suspension of the stopper modified composites.

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confidence: 99%

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confidence: 99%

Luminescence Enhancement after Adding Stoppers to Europium(III) Nanozeolite L

Wang

et al. 2014

Angew Chem Int Ed

106

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“…A gel with the molar composition of 20SiO 2 :Al 2 O 3 :10K 2 O:400 H 2 O was used to synthesize zeolite LTL powder [33]. Since this research work aimed at the synthesis of zeolite in a templatefree environment due to negligible hydrolysis of TEOS in water in the absence of an organic template, the application of this Si-precursor was not successful.…”

Section: Synthesis Of Nanozeolite Ltlmentioning

confidence: 99%

“…Furthermore, calcination of the final membrane film is not needed, which can prevent defects and cracks on the produced zeolite film that could happen due to calcination at higher temperature. Tsapatsis et al reported a growth solution comprised of the mentioned solution for the secondary growth of nanocrystalline zeolite L seed crystals [33]. They use these secondary growth solutions for preparing a self-supported membrane and reported a fragile and noncontinuous zeolite film.…”

Section: Membrane Preparationmentioning

confidence: 99%

Controlled Synthesis of a Thin LTL Zeolitic Membrane Using Nano‐Sized Seeds: Characterization and Permeation Performance

Ghoroghchian¹,

Aghabozorg²,

Farshid

et al. 2010

Chem Eng & Technol

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Industrial zeolitic membranes which offer a remarkable selectivity compared to polymeric membranes, suffer of the lower flux due of their larger thickness (e.g., 10-30 lm). This problem can be addressed by controlled synthesis of nanolayers, resulting in thinner membrane layers (e.g., 0.5-5 lm). An aluminosilicate gel with a molar composition of 20SiO 2 :Al 2 O 3 :10K 2 O:400H 2 O was used to prepare several membranes of zeolite L by means of a controlled hydrothermal synthesis on the surface of a porous alumina disc seeded with nanozeolite LTL crystals. Nanocrystallites of LTL zeolite with an average particle size of 80-100 nm were successfully synthesized and characterized. Using these nanoparticles as seeds, a zeolite L layer with an average thickness of 2 lm was synthesized on the alumina support at 150°C.

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“…It is well known that the presence of seeds on support surface plays an important role in membrane formation. Synthesis with seeds gives a better control of the membrane formation process by separating the crystal nucleation and growth with a shortened crystallization time [14][15][16]. In ad-dition, the secondary growth method ensures growth of the zeolite crystals on the support rather than in the solution and restrains the nucleation transform to other crystals [17,18].…”

Section: Introductionmentioning

confidence: 99%