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SEM images of freeze-dried samples of layered hydrogels, which were prepared by casting the sacran LC solution with a concentration of 0.5% w/v and then thermally cross-linking at 60 (a, f), 80 (b, g), 100 (c, h), 120 (d, i), and 140 °C (e, j). Side views (f–j) reveal pore structure, whereas top views (a–e) reveal no pore structure. The scale bar is 100 μm.
