Collagen/apatite coating on 3-dimensional carbon/carbon composite

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Materials Science

Background:

• Three-dimensional carbon/carbon composite (3D C/C) exhibits mechanical properties similar to human bone, making it a candidate for bone-repairing materials.
• As-received 3D C/C demonstrates bioinertness in simulated body fluid (SBF), necessitating surface modifications to enhance bioactivity.

Purpose of the Study:

• To improve the bioactivity of 3D C/C for enhanced bone repair applications.
• To evaluate surface modification techniques for promoting calcium phosphate and apatite formation on 3D C/C.

Main Methods:

• Surface modification of 3D C/C via polyethylene glycol (PEG) grafting using alpha, omega di(aminopropyl) polyethylene glycol 800 (NH2-PEG-NH2).
• Surface modification of 3D C/C through phosphorylation and precalcification in saturated Ca(OH)2 solution.
• Development of a rapid collagen/apatite coating method using a specialized calcification solution.

Main Results:

• PEG grafting resulted in a continuous calcium phosphate layer formation on 3D C/C after 4 weeks in SBF.
• Phosphorylated 3D C/C successfully induced apatite precipitation post-precalcification within 1 week.
• A novel calcification solution enabled collagen/apatite coating on 3D C/C in just 9 hours under ambient conditions.

Conclusions:

• Surface modification strategies effectively enhance the bioactivity of 3D C/C.
• The developed methods facilitate rapid and efficient formation of bone-like mineral layers on 3D C/C.
• These advancements position 3D C/C as a more viable biomaterial for bone regeneration.