Synthesis and thermal conductivity of functionalized biocarbon-Fe<sub>3</sub>O<sub>4</sub> nanocomposite-based green nanofluid for heat transfer applications
Divya P. Barai, Sohan A. Parbat, Bharat A. Bhanvase
Abstract
Bio-based graphitic carbon was synthesized in this work by one-step carbonization of bamboo waste at low temperature. This bio-based carbon was then functionalized in order to decorated it with Fe 3 O 4 nanoparticles. The functionalized biocarbon-Fe 3 O 4 (f-biocarbon-Fe 3 O 4 ) nanocomposite was synthesized using ultrasound-assisted coprecipitation method which was then confirmed by scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffractometry. Water-based nanofluid was prepared using the synthesized f-biocarbon-Fe 3 O 4 nanocomposite particles. Thermal conductivity of this nanofluid was analyzed at different concentrations and temperatures. A thermal conductivity enhancement of almost 80% was recorded at 35°C for nanofluid containing 0.1 vol.% of f-biocarbon-Fe 3 O 4 nanocomposite particles compared to water. Also, empirical model is developed for prediction of thermal conductivity as a function of concentration and temperature of bamboo waste-derived f-biocarbon-Fe 3 O 4 nanocomposite-based green nanofluid.