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Abstract
Electrochemical method has been developed to produce hydroxyapatite (HA) powders. Synthesis of hydroxyapatite particles was carried out from a homogeneous solution. The homogeneous solution was contained of Na 2 H 2 EDTA.2H 2 O, KH 2 PO 4 and CaCl 2 on 0.25/0.25/0.15 M. Water reduction at cathode to form OH − ion is very substantial in formation of hydroxyapatite. The OH − ions causes the release of Ca 2+ ions and change the equilibrium phosphate for the formation reaction of HA. The problem of electrochemical method is OH − ions move away from the cathode due to the difference in charge. This condition decrease the productivity of the formation of HA because OH − ions react with H + to form H 2 O. In this work, we develop new method electrosynthesis of HA with 2 chambers system. The electrolysis use ion exchange resin to separate the OH − ions and H + ions formed. The effect of current density to HA product was studied. HA product analysed with XRD. We conclude that the electrosynthesis hydroxyapatite with ion exchange resin more effective than without ion exchange resin. The higher current density, the more pure HA formed.
Highlights
Hydroxyapatite, called hydroxylapatite, is one of the calsium phosphate based bioceramic material which makes the majority of inorganic components of human bones and teeth
Various synthesis methods have been used for powder hydroxyapatite synthesis, e.g. chemical precipitation method [2], hydrotermal technique [3. 4], emulsion method [5], and sol-gel process [6], mechanochemical method [7]
Chemical precipitation process is the most reported method for preparing hydroxyapatite particles. This process is simple, low cost, and suitable for industrial production but difficult to control and resultant particles have a low quality with a large particle size, wide particle size distribution and a lot of agglomerates
Summary
Hydroxyapatite, called hydroxylapatite, is one of the calsium phosphate based bioceramic material which makes the majority of inorganic components of human bones and teeth. Chemical precipitation process is the most reported method for preparing hydroxyapatite particles. This process is simple, low cost, and suitable for industrial production but difficult to control and resultant particles have a low quality with a large particle size, wide particle size distribution and a lot of agglomerates. The main advantage of emulsion technique is the simplicity of the process, good crystallinity product without high temperature, and favours the formation of small crystallites with a sufficient narrow size distribution. Electrochemical deposition is one of the most commonly used method for hydroxyapatite coating at metal This method is known to be the effective and efficient techniques to assemble fine particle. The effect of current density to HA product was studied
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