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Synthesis and Structure of Ultrafine Zeolite KL (LTL) Crystallites and their Use for Thin Film Zeolite Processing

Published online by Cambridge University Press:  28 February 2011

Michael Tsapatsis ,
Tatsuya Okubo ,
Mark Lovallo  and
Mark E. Davis
Michael Tsapatsis
Affiliation:
Department of Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
Tatsuya Okubo
Affiliation:
Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bonkyo-ku, Tokyo 113
Mark Lovallo
Affiliation:
Department of Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
Mark E. Davis
Affiliation:
Department of Chemical Engineering, California Institute of Technology, Pasadena, CA 91125
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Abstract

Synthesis conditions were identified leading to agglomerates of nearly cylindrical zeolite nanocrystals with dimensions less than 50 nm in the channel direction and approximately 10 nm in diameter (in the direction perpendicular to the zeolite channels). The nanocrystals form agglomerates with approximate particle sizes ranging from 20 to 400 nm as determined by DLS. Washing with repeated centrifugation and sonication results in stable (over long periods of time) colloidal suspensions of the zeolite particles in water (pH ∼ 7) with zeolite concentrations of lOg/l. The average zeolite particle size of the suspension can be as low as 20 nm as determined by DLS. Films free of microcracks were prepared from these suspensions by evaporation of water.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 371: Symposium W1 – Advances in Porous Materials , 1994 , 21
Copyright
Copyright © Materials Research Society 1995

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