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The SEM images of (A) raw Mt, (B) acid-Mt, (C) Mt-BH, (D) conventional microsphere, and (E) BMEM.
Abbreviations: Acid-Mt, montmorillonite treated with acid; BMEM, betaxolol hydrochloride encapsulated microsphere; Mt, montmorillonite; Mt-BH, betaxolol hydrochloride loaded into montmorillonite; SEM, scanning electron microscopy.
