Title electrophoretic deposition of hydroxyapatite-carbon nanotubes nanocomposite coatings Type of Research Project Keywords Electrophoretic deposition (EPD), Hydroxyapatite (HA) nanoparticles, Carbon nanotubes (CNTs), Composite coatings, reinforcing. Abstract Isopropanolic Suspensions of HA nanoparticles (20g/L) plus various concentrations of CNTs were prepared using Tris and TEA as dispersant. The positively charged HA nanoparticles were heterocoagulated on the negatively charged CNTs and generated the HA-CNT composite particles with net positive surface charge. The heterocoagulation was more intensive in dispersant containing suspensions due to the higher zeta potential of HA nanoparticles in them. HA-CNTs particles can be rotated and aligned parallel to electric field as a result of torque exerted on them due to the generation of a dipole moment in CNTs during EPD. The mobility of HA-CNTs particles aligned parallel to electric field is ≈50% higher than that of HA nanoparticles leading to the faster EPD from dispersant containing suspensions when CNTs are added into them. CNTs more efficiently reinforced the coatings deposited from dispersant containing suspensions due to the stronger electrostatic bonding between CNTs and HA nanoparticles in them. Researchers Morteza Farrokhi-rad (First Researcher)