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(a) Digital camera image of polyurethane (PU) foam and (b) SEM image of the PU foam reproduced respectively from Boccardi et al. [12] and Zhang et al. [24] under the terms of the Creative Commons Attribution License. (c–f) Pore structure and strut morphology of 45S5 Bioglass®-derived foams sintered at (c,d) 900 °C for 5 h; (e,f) 950 °C for 2 h; and (g,h) 1000 °C for 1 h. Figures from (c) to (h) reproduced with permission from Chen et al. [2] (Copyright © 2021 Elsevier Ltd.).
