Naskar, Milan Kanti and Das, A and Kundu, Debtosh and Chatterjee, Minati (2011) Emulsion-based synthesis of NaA zeolite nanocrystals and its integration towards NaA membranes. Bulletin of Materials Science, 34 (4). pp. 651-659. ISSN 0250-4707

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NaA zeolite nanoparticles (seed crystals) of size 50-65 nm were synthesized using water-in-oil (w/o) type emulsions at a considerably low temperature of 65 +/- 1 degrees C in a short duration of 2 h. The emulsions were stabilized using non-ionic surfactants e. g. sorbitan monooleate (Span 80), sorbitan monolaurate (Span 20), polyoxyethylene(5) nonylphenylether with ethoxy numbers of 5 (Igepal CO-520) and polyoxyethylene sorbitan monooleate (Tween 80) of hydrophilic-lipophilic balance (HLB) values of 4.3, 8.6, 10 and 15 respectively. Among the surfactants, the intermediate HLB values of 8.6 (Span 20) and 10 (Igepal CO-520) were effective in synthesizing highly dispersible NaA nanoparticles of size 50-65 nm. The membrane prepared hydrothermally in multi-steps at 65 +/- 1 degrees C, using the Span 20-derived seed crystals deposited on porous support, showed the formation of high quality interlocked NaA coating. Single gas nitrogen (N(2)) permeation of the membrane exhibited a permeance value of 1.01 x 10(-8) mol m(-2) s(-1) Pa(-1) at ambient temperature (30 degrees C).

Item Type: Article
Uncontrolled Keywords: Zeolite nanocrystals; Emulsion synthesis; Hydrothermal technique; NaA membrane; Microstructure
Subjects: Structural Clay Products
Divisions: Sol Gel
Depositing User: Bidhan Chaudhuri
Date Deposited: 07 Aug 2012 11:52
Last Modified: 07 Aug 2012 11:52

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