Hydroxyapatite is a ceramic with wide application in medicine and dentistry due to most important feature is bioactivity. So, researchers have tried to customize its properties such as bioactivity, mechanical strength, solubility and sinterability by controlling its composition, morphology and particle size. In this research the morphological changes of nanoparticle hydroxyaparite in presence of polyethylene glycol and acetic acid synthesized by sol-gel technique is presented. Nanocrystalline powders of hydroxyapatite (HA) were prepared from Ca(NO3)2·4H2O and PO(OC2H5)3 as calcium and phosphorus precursors, respectively. Polyethylene glycol and acid acetic were added as modifier. The obtained samples were characterized through X-ray diffraction (XRD), scanning electronic microscopy (SEM) and TEM analysis. Their morphology of hydroxyapatite depend on the kind of modifier, polyethylene glycol create preferential growth of particles in result morphology become the needle-shaped, while acetic acid does not affect on the shape of particles but it create agglomerate.

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