Hydroxylapatite Lab Report

1629 Words7 Pages
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 Na2H2EDTA.2H2O, KH2PO4 and CaCl2 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 Ca2+ 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 H2O. In this work, we develop new method electrosynthesis…show more content…
The formula of hydroxyapatite is Ca5(PO4)3OH but usually written Ca10(PO4)6(OH)2 to denote that the crystal unit cell comprises two entities. The calcium hydroxyapatite use as bone substitute materials because of their chemical similarity to the component of bones and teeth of mammalian. Calsium hydroxyapatite also used as fillers and coatings for repairing of large osseous defects…show more content…
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. The hydrothermal technique usually gives hydroxyapatite powders a high degree of crystallinity. However, need high temperature and the obtained powders are usually in agglomeration and the size distribution are usually in wide range. 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. Sol-gel synthesis of hydroxyapatite has many advantages, which include high product purity, homogeneous composition, and low synthesis temperature. When the mass production of high crystalline hydroxyapatite is required, mechanochemical treatment is more suitable. Despite the risk of contamination during milling. 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

More about Hydroxylapatite Lab Report

Open Document