Kinetics of hydroxyapatite precipitation at pH 10 to 11.
作者： Changsheng Liu , Yue Huang , Wei Shen , Jinghua Cui
DOI: 10.1016/S0142-9612(00)00166-6
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摘要: The mechanism and kinetics of hydroxyapatite (HAP) precipitation from aqueous solution at the conditions pH 10-11 calcium ion concentrations more than 0.5 mol/l were investigated. results show that reaction undergoes following process: transferring octacalcium phosphate (OCP) to amorphous (ACP) rapidly, then ACP calcium-deficient (DAP) HAP. DAP was non-stoichiometric material converts Reaction temperature greatly affects rate conversion It takes about 24 h form pure-phase HAP 25 degrees C while it only 5 min 60 C. also has a great deal influence on particle size morphology precipitated hydroxyapatite. transformation second order activation energy 95 kJ/mol (22.7 kCal/mol) therefore inferred surface control process.
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