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Preparation of Nanohydroxyapatite by a Sol–Gel Method Using Alginic Acid as a Complexing Agent

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Single-phase calcium hydroxyapatite (HAP) was synthesized by a sol–gel route using calcium nitrate solution and ammonium dihydrogen phosphate solution as Ca and P sources and alginic acid as a chelating agent. The dried gel was heat-treated at different temperatures in the range of 110°–900°C. Structural evolution from sol to gel and from the gel to HAP was studied by the powder X-ray diffraction method, Infrared spectroscopy, and thermal analyses. The formation temperature of HAP was confirmed to be ∼300°C. Examination of the product obtained at 300°C under TEM suggested the development of hexagonal-shaped nanoparticles, with the average particle size in the range of 50–100 nm.
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Document Type: Research Article

Affiliations: Materials Division-Chemistry, School of Science and Humanities, VIT University, Vellore 632 014, Tamil Nadu, India

Publication date: October 1, 2009

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