Functionalized and Pigmented Multi-walled Carbon Nanotubes for Aesthetic and Structural Prosthetic Applications.

Abstract

This study synthesised and characterised pigmented multi-walled carbon nanotubes (pMWCNTs) using kaolin from Kogi State, Nigeria, as a sustainable resource for prosthetic reinforcement. The multi-walled carbon nanotubes (MWCNTs) were synthesized via catalytic chemical vapour deposition (CVD) using Fe-Ni supported on kaolin as the catalyst, and functionalized with sulphuric acid (H₂SO₄) and nitric acid (HNO₃) in a 3:1 ratio to enhance dispersion in polymer. Subsequently, the MWCNTs were coated with red and yellow oxide to improve aesthetic. Thermogravimetric analysis (TGA) showed a 3.14% residue at 500 °C. HRSEM imaging showed good dispersion of the nanotubes, and EDX confirmed the presence of 10.4 wt. % Fe (iron) and 5.6 wt. % O (oxygen), indicating successful pigment integration and stability. These results suggest that pMWCNTs can serve effectively as reinforcement materials with potential in visually appealing prosthetic limb applications.