Synthesis and characterization of nano-crystalline calcium phosphates with EDTA-assisted hydrothermal method |
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| Authors: | Renlong Xin Fuzeng Ren Yang Leng |
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| Affiliation: | 1. College of Materials Science and Engineering, Chongqing University, Chongqing, China;2. Department of Mechanical Engineering, Hong Kong University of Science and Technology, Kowloon, Hong Kong, China |
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| Abstract: | This study aims to prepare the biologically important hydroxyapatite (HA), dicalcium phosphate dihydrate (DCPD) and dicalcium phosphate anhydrous (DCPA) phases in simple EDTA – assisted hydrothermal method. X-ray diffraction results showed that pure DCPD, DCPA and HA nano-crystals were obtained in the Ca–EDTA/PO4 solutions at 120 °C, 180 °C and 210 °C, respectively. Thermal gravimetric analysis of the DCPD precipitates revealed that phase transformations of DCPD to DCPA and DCPA to HA occurred at 139 °C and 195 °C, respectively, which resulted in the different Ca–P phases during hydrothermal synthesis at different temperature ranges. |
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