Preparation and characterization of selenite substituted hydroxyapatite

Area of Science:

• Biomaterials Science
• Materials Chemistry
• Nanotechnology

Background:

• Hydroxyapatite (HA) is a key material for bone regeneration.
• Incorporating trace elements can enhance HA properties.
• Selenium's biological roles suggest potential benefits in biomaterials.

Purpose of the Study:

• To synthesize selenite-substituted hydroxyapatite (Se-HA) using a co-precipitation method.
• To investigate the effect of selenite substitution on HA's structural and thermal properties.
• To evaluate the potential of Se-HA for bone repair scaffold applications.

Main Methods:

• Co-precipitation method using sodium selenite as the selenium source.
• Characterization using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM).
• Assessment of thermal stability through sintering tests.

Main Results:

• Selenite successfully substituted phosphate groups in the hydroxyapatite lattice.
• Substitution altered lattice parameters and reduced crystallite size and crystallinity.
• Nano-crystalline Se-HA was obtained for Se/P ratios up to 0.1.
• Se-HA with Se/P ratio of 0.1 exhibited thermal stability at 900 °C for 2 hours.

Conclusions:

• Selenite substitution modifies hydroxyapatite structure and properties.
• Se-HA with a Se/P ratio of 0.1 demonstrates promising thermal stability.
• Se-HA holds significant potential for developing advanced bone repair scaffolds.