Alkaline treatment kinetics of calcium phosphate by piezoelectric quartz crystal impedance

作者：Zeng Li ping; He De liang^*; Xu Chao; Luo Sheng lian

来源：Journal of Central South University of Technology, 2009, 16(4): 558-562.

DOI：10.1007/s11771-009-0093-4

• hydroxyapatite
• calcium phosphate
• piezoelectric quartz crystal impedance
• alkaline treatment
• kinetics

Calcium phosphate film was prepared by electrochemical deposition technology. Subsequently, the alkaline treatment process of calcium phosphate film in 0.1 mol/L NaOH solution was monitored on real time by the piezoelectric quartz crystal impedance (PQCI) technique. The variations of morphology and composition for the alkaline treatment products were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), respectively. The dynamic variations of calcium phosphate can be characterized by the change of equivalent circuit parameters. The results show that the forming process of hydroxyapatite (HA) is composed of three stages: (1) acidic calcium phosphate dissolution; (2) phase transformation; and (3) HA formation. Furthermore, the correlative kinetic equations and parameters are obtained by fitting the static capacitance (C (s))-time curves.

• 出版日期2009-8
• 单位湖南大学