Controlling the Structure of Hydroxyapatite Ceramics with Dual Pores Prepared Using Freeze-Casting

Figure 3

SEM images of porous HA scaffolds prepared at different cooling speeds: (a) 1.3°C/min; (b) 2.2°C/min; (c) 4.8°C/min; (d) 5.5°C/min.

(a)

(b)

(c)

(d)