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SEM microphotographs of vertical cross-sections (a, d, g), horizontal cross-sections (b, e, h), and the inner surfaces (c, f, i) of the cylinder-shaped PLLA sponges prepared with NaCl particulates having a diameter range of 90–150 μm (a–c), 150–250 μm (d–f), and 250–355 μm (g–i). The ratio of polymer to NaCl was 1 : 9.
