Isobaric heat capacity and density of ethylene glycol based nanofluids containing various nitride nanoparticle types: An experimental study

This work presents experimental results on the isobaric heat capacity of ethylene glycol (EG) based nanofluids containing three types of nitride nanoparticles: aluminium nitride (AlN), silicon nitride (Si3N4) and titanium nitride (TiN). The densities of the nanofluids were also investigated in this study. Each type of material was used in two different sizes of nanoparticles and with various values of specific surface area. Temperature-modulated differential scanning calorimetry and vibrating tube techniques were used, and measurements were performed at three different temperatures: 288.15 K, 298.15 K and 308.15 K. The obtained experimental results were compared with the predictions of theoretical models, and absolute average deviations were calculated. It was demonstrated that the fraction of nanoparticles strongly affects isobaric heat capacity and density, while the size of the particles does not significantly impact these properties.