Nano-hydroxyapatite surfaces grafted with electroactive aniline tetramers for bone-tissue engineering

Area of Science:

• Biomaterials Science
• Nanotechnology
• Electrochemistry

Background:

• Hydroxyapatite (HA) is a key biomaterial for bone regeneration.
• Developing electroactive nanomaterials can improve biomaterial performance.
• Amino/carboxyl-capped aniline tetramer (AT) offers electroactive properties.

Purpose of the Study:

• To create novel electroactive HA-AT nanoparticles by covalently grafting AT onto HA.
• To characterize the synthesized HA-AT nanoparticles.
• To evaluate the effect of HA-AT on poly(lactic acid) (PLA) matrix properties.

Main Methods:

• Covalent grafting of AT onto HA nanoparticles.
• Thermogravimetric analysis (TGA) for AT content determination.
• Fourier transform IR (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), X-ray diffraction, and scanning electron microscopy (SEM) for characterization.

Main Results:

• Successfully synthesized HA-AT nanoparticles with AT content ranging from 16.5 to 34.0 wt%.
• Characterization confirmed successful grafting and nanoparticle structure.
• HA-AT/PLA composites showed significantly improved adhesion and proliferation compared to HA/PLA.
• Optimal biocompatibility was observed at 15 wt% AT grafting.

Conclusions:

• Electroactive HA-AT nanoparticles were successfully synthesized and characterized.
• The incorporation of HA-AT into PLA matrices enhances biocompatibility, adhesion, and proliferation.
• These findings suggest HA-AT nanoparticles are promising for advanced biomedical applications.