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SEM images of the aerogels at 23.6 and 32.5 kg m−3 with the three compositions CNF100, CNF95XG5, CNF60XG40 prepared by unidirectional (a–g; a’–g’) and non-directional (h–m; h’–m’) freezing processes. SEM images from longitudinal (a–g; h–m) and cross-section (a’–g’; h’–m’) views. Yellow scale bars are of 500 µm.
