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SEM images of 3D-printed aerogel scaffolds prepared from alginate 6 wt.% inks (a,b) without and (c,d) with a one-hour ageing step in 1 M CaCl2 solution. Aerogels were observed at two different magnifications. Intake in (a,c): visual appearance of the aerogel scaffolds with a well-defined 3D-pattern.
