The synthesis and investigation of magnetic behavior of magnetite-carbon nanotubes nanocomposite (Fe3O4-CNTs) for water-based convective heat transfer application

In the present investigation, the carbon nanotube supported magnetite nanocomposite (Fe3O4-CNTs) was prepared by the use of solvothermal technique. Fe3O4-CNTs nanocomposite was fully characterized by various techniques including TEM, XRD, FTIR, VSM and zeta potential analyses. According to TEM and XRD results, the particle and the crystallite sizes were found to be 150-250 nm and 7.3 nm, respectively which were indicative of the agglomeration and formation of larger clusters. VSM analysis confirmed the paramagnetic characteristic of the resulted nanocomposite. Finally, the effect of magnetic field on the thermal behavior of water-based Fe3O4-CNTs nanofluid was evaluated, showing an enhancement of heat transfer coefficient up to 30% at magnetic field of 2.3 mT.