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Effects of pH and reaction temperature on hydroxyapatite powders synthesized by precipitation

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Abstract

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.

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Acknowledgements

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. 2018R1D1A1B07050524).

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  1. Department of Engineering Technology, Graduate School of Industry, Kyungpook National University, Daegu, 41566, Republic of Korea

    In-Ho Lee

  2. School of Materials Science and Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea

    Jung-A Lee, Joon-Hyung Lee, Young-Woo Heo & Jeong-Joo Kim

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Lee, IH., Lee, JA., Lee, JH. et al. Effects of pH and reaction temperature on hydroxyapatite powders synthesized by precipitation. J. Korean Ceram. Soc. 57, 56–64 (2020). https://doi.org/10.1007/s43207-019-00004-0

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