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J. Korean Ceram. Soc. > Volume 57(1); 2020 > Article
Journal of the Korean Ceramic Society 2020;57(1): 56-64.
doi: https://doi.org/10.1007/s43207-019-00004-0
Effects of pH and reaction temperature on hydroxyapatite powders synthesized by precipitation
In‑Ho Lee1, Jung‑A Lee2, Joon‑Hyung Lee2, Young‑Woo Heo2, Jeong‑Joo Kim2
1Department of Engineering Technology, Graduate School of Industry, Kyungpook National University, Daegu 41566, Republic of Korea
2School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
Correspondence  Jeong‑Joo Kim ,Email: jjkim@knu.ac.kr
Received: October 11, 2019; Revised: November 6, 2019   Accepted: November 7, 2019.  Published online: January 31, 2020.
Hydroxyapatite (HA) was synthesized through the precipitation method and different processing parameters (Ca/P molar ratio, pH, and reaction temperature) were varied to investigate their influence on the HA formation. No HA powder was obtained at pH 10 and 25 °C, even when using a Ca/P ratio as high as 2.2. However, HA powders were successfully produced at pH above 11, 25 °C, and Ca/P ratio of 2.2. At pH 10 and 25 °C, the concentration of the H+ ions in the reaction solution increased and so did the Ca loss, resulting Ca-deficient hydroxyapatite (CdHA) formation. While HA was formed instead due to a lower Ca loss when the pH was increased to 11 and 11.3. As the reaction temperature was increased to 70 and 90 °C, the HA formation occurred regardless of the pH because of the decreased solubility of HA in the solution.
Key words: Hydroxyapatite · Precipitation · pH · Temperature · Shape
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