Fig. 2From: Characterization and in vitro assessment of three-dimensional extrusion Mg-Sr codoped SiO2-complexed porous microhydroxyapatite whisker scaffolds for biomedical engineeringSurface morphology and porous structure analyses. The macroporous surfaces of SHA (a1–a2), SMHA (b1–b2), SSHA (c1–c2), and SMSHA (d1–d2). The microporous surfaces of SHA (a3–a4), SMHA (b3–b4), SSHA (c3–c4), and SMSHA (d3–d4)Back to article page