Tween80 had significant effects on the growth and morphological
development of FHAp crystals as shown in Fig. 3. Without
Fig. 6. XRD patterns of the resultant powders (a) pH=4 without Tween 80,
(b) pH varied from 4 to 9 in 30 min without Tween 80, (c) pH=4 with 6.5
g/l Tween 80, (d) pH varied from 4 to 9 in 30 min with 6.5 g/l Tween 80, (e)
pH=9 with 6.5 g/l Tween 80.