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SEM images of cross-section for different hydrogel composites. The arrows in the picture of 3% chitosan (3%C) and its HNTs composites (3%CS + 2%HNTs) point to the example of bubbles. The arrows in the picture of 4% chitosan (4%C) and 5% chitosan (5%C) and their hydrogel composites (4%CS + 2%HNTs and 5%CS + 2%HNTs) point to the example of pores.
