The preparation of dispersible MFI-type zeolite nanoparticles with open micropores is challenging. Herein

a rapid and effective ultrasound-assisted liquid-phase exfoliation method along with a freezedrying process for redispersion of calcined silicalite-1 (S-1) zeolite nanoparticle aggregates using 3- aminopropanol as an exfoliating agent is demonstrated. The exfoliation of S-1 zeolite nanoparticles is characterized by X-ray diffraction

scanning electron microscopy and DLS particle size analysis. The effects of drying methods of as-synthesized zeolite nanoparticle suspension

zeolite contents in frozen nanoparticle suspension

exfoliating agent concentrations

and zeolite doses in ultrasonic suspension on exfoliation efficiency are systematically investigated. It is found that the S-1 zeolite nanoparticle (~70 nm) achieves a yield up to 95% through a 30 min ultrasonic exfoliation in a 3-aminopropanol solution along with a freeze-drying process. The proposed exfoliation mechanism involves two primary stages: guest molecule insertion followed by water expansion

both substantially enhanced by tip sonication. This work offers a comprehensive understanding of the exfoliation process

provides valuable insights into the dispersion of sintered zeolite nanoparticles.