Abstract
The Langmuir−Blodgett technique was explored for the preparation of zeolite Beta monolayer films. The films were obtained using two zeolite Beta samples having similar Si/Al ratios but different crystal size, morphology, and hydrophobic properties. Both zeolites were suspended in methanol. The colloidal zeolite Beta sample required modification with a cationic surfactant for films at the air−water interface to be formed. The hydrophobic microcrystal zeolite Beta synthesized in a fluoride medium was used in the Langmuir−Blodgett procedure directly. The different behavior of the two samples was explained by their interaction with methanol, which stabilized the zeolites spread at the air−water interface to a different extent. The floating zeolite Beta films were successfully transferred on silicon wafers by the vertical lifting method. The zeolite Beta crystals and films were studied by SEM, XRD, TG, DLS, zeta potential and nitrogen adsorption measurements, and ATR-IR.
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