The reason for the difference at the varied pH values could be
sought from solubility isotherms. According to the literature data
[24–26], the solubility isotherms were calculated and shown in
Fig. 7. It is clear that CaF2 is the most stable phase at pH<4.2,
which explained the occurrence of CaF2 in Fig. 6a. In the pH range
of 4.2¨10, apatite is the stable phase and have a minimum
solubility around pH=9. Although, when pH values were recycled
to 9, CaF2 was transformed into the stable apatite phase as shown
by Fig 6b, no rod-like morphologies were developed, which
indicated that the pH recycling method was not suitable to the
preparation of FHAp nanorods. In contrast, surfactant-mediated
crystal growth provided a convenient means for the preparation of
FHAp nanorods. Tween80 altered the growth rates of crystal
surfaces through adsorbing on them and thus developed the FHAp
nanorods
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