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    • Emulsion-based synthesis of NaA zeolite nanocrystals and its integration towards NaA membranes

      M K Naskar A Das D Kundu M Chatterjee

      Volume 34 Issue 4 July 2011 pp 651-659

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/034/04/0651-0659

    • Keywords

       

      Zeolite nanocrystals; emulsion synthesis; hydrothermal technique; NaA membrane; microstructure.

    • Abstract

       

      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°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°C, using the Span 20-derived seed crystals deposited on porous support, showed the formation of high quality interlocked NaA coating. Single gas nitrogen (N2) permeation of the membrane exhibited a permeance value of 1.01 × 10-8 mol m-2 s-1 Pa-1 at ambient temperature (30°C).

    • Author Affiliations

       

      M K Naskar1 A Das1 D Kundu1 M Chatterjee1

      1. Sol-Gel Division, Central Glass & Ceramic Research Institute (CSIR), Jadavpur, Kolkata 700 032, India

    • Dates

       
      Published
      July 2011
      Manuscript received
      2 December 2009
      Manuscript revised
      2 August 2010

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