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Scanning Electron Microscopy (SEM) images of (a) uncoated polyurethane foam; (b,c) foam coated with 10 bi-layers of chitosan/sodium montmorillonite at pH = 3 (panel (b)); foam coated with 10 bi-layers of chitosan/sodium montmorillonite at pH = 6 (panel (c)). Reprinted with permission from [53]. Copyright 2012, American Chemical Society.
