Relatively monodisperse zeolite (ZSM-2) nanoparticles were synthesized by a hydrothermal reaction.  The approximately 150 nm diameter zeolite nanoparticles have a well-defined hexagonal platelet-like geometry with an aspect ratio of approximately 5:1 and form a stable colloidal suspension in water.  The nanoplatelets were deposited onto a substrate by a controlled convective assembly method that involved evaporation of a dilute aqueous suspension confined in a small meniscus region that was slowly drawn across the substrate surface.  The deposition formed a coating of the zeolite nanoplatelets with monolayer and multilayer regions.  The nanoparticles in monolayer regions are close-packed and uniformly oriented in a hexagonal arrangement, while the multilayer regions are disordered.  Major process parameters such as suspension concentration and deposition speed were found to be key factors in controlling the resulting morphology and continuity of the coating.  The surface energy of the substrate surface and the evaporation rate are also significant.  The results make possible the rapid and facile deposition of strongly adhesive catalytic nanofilms.

Deposition of 2D colloidal coatings from zeolite nanoplatelets by controlled convective assembly

247th National Meeting (2014)

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