Conclusion
FHAp nanorods were successfully prepared by adding
Tween80. The analyses of XRD, FTIR and fluoride ion
selective electrode showed that the as-prepared powder was
fluoride-substituted hydroxyapatite without any impure
phase. The clear morphological variation, after adding
Tween80, was attributable to the enlarged difference
between the growth rates of crystal face due to the
adsorption of Tween80. Experimental results and the
analyses of solubility isotherms of Ca2+–PO4
3–F–H2O
system showed that the pH value should be controlled at
about 9 when preparing the FHAp nanorods with the
addition of Tween80.