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SEM images of pure-EC films (A) before and after being submerged in dissolution media with different release buffers for 24h: (B) deionized water, (C) HCl solution at pH 1.2, (D) phosphate buffer at pH 6.8, (E) 0.005 M acetate buffer at pH 4.5, (F) 0.05 M acetate buffer at pH 4.5, and (G) 0.5 M acetate buffer at pH 4.5. The circles area showed the small pores formed in the pure-EC films.
