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Scanning electron microscopy (SEM) images of cross sections (a–c) and surfaces (d–i) of the hydrogels materials with 0.05 wt % (a,d,g) 0.1 wt % (b,e,h) and 0.5 wt % (c,f,i) photoinitiator. White bars correspond to 10 µm (a–c), 100 µm (d–f), and 1 µm (g–i).
