Figure 13.
SEM analysis of polyurethane sponges (a,b) and macro-mesoporous scaffolds with composition (mol.%) 100SiO2 (c,d), 90SiO2–5CaO–5P2O5 (e,f), 80SiO2–15CaO–5P2O5 (g,h), and 70SiO2–25CaO–5P2O5 (i,j) [56].
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