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Morphology of chitosan aerogels (A) 2.5 w/v% chitosan, DA = 10%, MW 200–400 kDa, solvent 2%v acetic acid [275], and (B) 0.4 wt/v% chitosan, DA < 20%, solvent 2%v acetic acid, crosslinker formaldehyde 7.2 wt% [280]. (adapted with permission from Takeshita, S.; Yoda, S. Chitosan aerogels: transparent, flexible thermal insulators. Chemistry of Materials 2015, 27, 7569–7572. Copyright 2015 American Chemical Society.).
