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SEM images of chitosan-poly(ɛ-caprolactone) hydrogel scaffold formed by freeze-drying. Hydrogels of pure chitosan (A) and chitosan blended with 50 wt% poly(ɛ-caprolactone) (B). Solutions in 25 vol.% acetic acid were frozen at −196°C and lyophilized at −80°C. Adapted with permission from Sarasam et al.87
