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Variation of AFM topologies of the supercritically dried samples of BC: native nano-gel film (a): 18 µm × 18 µm, (b): 3.2 µm × 3.2 µm, and samples treated by CBHSc for 120 min (c): 10 µm × 10 µm, (d): 2.5 µm × 2.5 µm, 240 min (e): 18 µm × 18 µm, (f): 3.2 µm × 3.2 µm and 1440 min (g): 18 µm × 18 µm, (h): 3.2 µm × 3.2 µm, respectively.
