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SEM micrographs of the hydrogel coating surfaces (A) alginate only; (B) alginate/HNTs; (C) CPC/alginate; (D) CPC/alginate/chitosan. At higher magnification, (E and F) HNTs can be seen protruding from the hydrogel surfaces (E) alginate/HNTs; (F) CPC/alginate/HNTs. Scale bar = 100 microns in A to D and 1 micron in E and F.
