Irradiation time-dependent study of eggshell-derived hydroxyapatite powder synthesized by microwave-assisted wet chemical precipitation method

• Main Authors: Goh, K. W., Wong, Yew Hoong, Singh, R. S. K., Chandran, Hari, Wong, S. K., Lee, K. Y. Sara
• Format: Article
• Published: Hanyang University 2022
• Subjects: QC Physics
• Online Access: http://eprints.um.edu.my/42303/

The extraction of calcium from natural biowaste material such as chicken eggshells have been shown to be viable to synthesis calcium phosphate bioceramic. In this work, eggshell-derived hydroxyapatite powder was synthesised by using the wet chemical precipitation technique coupled with microwave irradiation at low power (700 W) at varying exposure time from 5 to 30 min. The derived nano-powders were examined to determine the phases present, chemical bonding and microstructural evolution. It was revealed that the irradiation time has an effect on the degree of crystallinity and both the crystallite and particle size of the derived powders although the hydroxyapatite phase stability was not disrupted. An exposure time of 15 min. was determined to be sufficient when subjected to low power microwave irradiation to formed a well-defined needle-like hydroxyapatite particles having an average crystallite size of about 22 nm. On the contrary to many literatures, this study has demonstrated the viability of synthesizing a useful bioceramic from using biowaste eggshells coupled with microwave irradiation at low power of 700 W for very short period of time to produce nano-range needle-like hydroxyapatite particles suitable for biomedical application.