Continuous microwave flow synthesis of mesoporous hydroxyapatite.

Area of Science:

• Materials Science
• Nanotechnology
• Chemical Engineering

Background:

• Hydroxyapatite is a crucial biomaterial for bone regeneration.
• Conventional synthesis methods can be time-consuming and expensive.
• Developing efficient and scalable synthesis routes for hydroxyapatite is essential.

Purpose of the Study:

• To develop a template-free synthesis of mesoporous hydroxyapatite using continuous microwave flow synthesis (CMFS).
• To investigate the influence of CMFS parameters on hydroxyapatite properties.
• To evaluate the in-vitro ion dissolution behavior of the synthesized hydroxyapatite.

Main Methods:

• Utilized a modified household microwave, peristaltic pumps, and a Teflon coil for CMFS.
• Systematically varied microwave power, retention time, and reactant concentration.
• Characterized the synthesized hydroxyapatite using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM).
• Assessed in-vitro ion dissolution in Simulated Body Fluid (SBF).

Main Results:

• Successfully synthesized semi-crystalline, phase-pure, nano-sized hydroxyapatite.
• Demonstrated that microwave power and retention time significantly influence particle morphology, transitioning from spherical to mesoporous needle and rod-like structures.
• XRD and FTIR confirmed phase purity and composition.
• TEM revealed distinct morphological changes based on process parameters.

Conclusions:

• CMFS is an efficient and cost-effective technique for producing tunable mesoporous hydroxyapatite.
• The study provides insights into controlling hydroxyapatite morphology and crystallinity via CMFS parameters.
• The synthesized hydroxyapatite exhibits promising ion dissolution characteristics for potential biomedical applications.