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A self-supported asymmetric zeolite L film has been prepared through zeolite colloidal suspension processing followed by secondary (seeded) growth. Secondary growth is implemented to reduce interzeolitic (meso) porosity in the film. The resulting film varies in both porosity and grain size with a continuous, intergrown, thin (<200 nm) top layer (shown here) of zeolite L crystals.
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Lovallo et al. (1996) studied this question.
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