SYNTHESYS OF NANO CARBONATE HYDROXYAPATITE (CHA) BY PRECIPITATION METHOD AS A BIOCERAMICS MATERIAL

• Main Author: Nur Rahman, Didit
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/75349
• Institution: Institut Teknologi Bandung

Carbonate Hydroxyapatite is an excellent ingredient in the process of healing damaged bones and teeth. Many studies and experiments on this material have been carried out. CHA material can be synthesized by various methods. The synthesis of carbonate hydroxyapatite in this study was through the precipitation method with variations at pH 8, 10 and 12 and variations in calcination temperature, namely 500 °C, 600 °C and 700 °C. The calcined material was then characterized by XRD, FTIR, SEM, TEM, and SBF. The results of the XRD characterization showed that all samples had the same peak as Hydroxyapatite, there was an impurity phase, namely CaO in the sample synthesized at pH 12 with a calcination temperature of 700 °C as well as whitlockite in the sample synthesized at pH 8 with a calcination temperature of 700 °C. The c/a lattice parameter ratio of all samples showed an increase when compared to hydroxyapatite. The XRD results also show that the crystallinity of hydroxyapatite carbonate increases with increasing calcination temperature. The FTIR results show that there are absorption waves in the band ranges 1400 cm-1 and 870 cm-1 at all calcination temperatures indicating that type B carbonate hydroxyapatite has been formed. The pH conditions of the reaction also affect carbonate content of CHA, where the higher the reaction pH, the higher the carbonate content. The SEM image shows the presence of an apatite layer after the sample is immersed in the SBF solution, indicating that the bioactivity of the CHA material is good. The results of the EDX confirm that apatite layer precipitate at the surface of the sample, where there was a change in the value of the Ca/P ratio of the samples before and after being immersed in the SBF solution. From the TEM results it is known that carbonate hydroxyapatite nanoparticles with a rodlike shape with an average size of p = 49.7 nm l = 19.3 nm have been formed in the calcined sample at 500 °C and an almost spherical shape with an average size 47.8 nm for samples calcined at 600 °C and 700 °C.