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Compressive modulus as a function of (a) relative density for aerogels and foams based on CNF [85] (Reprinted from Composites Science and Technology, 71, Sehaqui, H.; Zhou, Q.; Berglund, L.A. High-porosity aerogels of high specific surface area prepared from nanofibrillated cellulose (NFC), 1593–1599, Copyright 2011, with permission from Elsevier) and (b) as a function of bulk density for aerogels and cryogels (or foams) based on cellulose II [89].
