Hydroxyapatite Bioceramic Heat Transfer Comparison in Water and Simulated Body Fluid after Addition of Carbon Nanotube

Although Hydroxyapatite (HA) is one of the biocompatible and insulating ceramics, Carbon Nanotube (CNT) is superior due to its high thermal conductivity. This research aims to compare the thermal conductivity of HA/CNT composite in two fluids, i.e., water and Simulated Body Fluid (SBF), to achieve simultaneous biocompatibility and thermal conductivity for dental coatings. To this end, followed by synthesizing the hydroxyapatite, the HA nanofluid was made, and the prepared carbon nanotube was added to the HA nanofluid (volume ratio of HA:CNT was 1:1) to achieve the hybrid nanofluid with different volume fractions (0.2 to 1.0 Vol %). The thermal conductivity was then measured for the two water and SBF fluids in the temperature range of 20 to 50 °C. The results showed that 1.0 Vol % sample of the hybrid nanofluid had the maximum thermal conductivity enhancement compared to the SBF-based hybrid and water-based hybrid nanofluids with 32 % and 20 % enhancement, respectively, at 50 °C.