Co-precipitation method has been used for magnetic graphene nanocomposite (MGNCs) fabrication. Various characterization procedures have been used to compare the physical and chemical properties graphene nanoplatelets (GNPs) with the synthetic MGNCs. The crystal and chemical structures of GNPs before and after magnetic fixation have been identified using X-Ray diffraction and Fourier Transformed Infrared spectroscopy respectively. Morphology structure of magnetic composite has been indicated by using Transmission Electron Microscope (TEM). The Vibrating sample magnetometer (VSM) has confirmed the paramagnetic properties of the prepared composite that represented at its hysteresis curve. GNPs/water and MGNCs/water nanofluid have been prepared. The nanofluid performance of graphene magnetic composite has been compared with its corresponding graphene in microtubes at laminar flow region fully developed. The magnetic composite nanofluid has had slight pressure drop and pumping power decrement compared with its corresponding graphene nanofluid. This increment at the magnetic nanofluid may be further improved through the utilizing external magnetic field to control the fluid flow.
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