THERMAL CONDUCTIVITY ENHANCEMENT OF NANOFLUIDS BY GREEN SYNTHESIZED CuO@NiO NANOCOMPOSITEJournal: International Journal of Advanced Research in Engineering and Technology (IJARET) (Vol.9, No. 4)
Publication Date: 2018-12-28
Authors : LIJA ARUN CHANDRASEKARAN KARTHIKEYAN; C. UNNI;
Page : 14-22
Keywords : Nanocomposite; phytosynthesized; Thermal conductivity; XPS; nanofluid.;
In this paper, CuO@NiO nanocomposites synthesized using green method on the thermal conductivity of base fluids like water and ethylene glycol was studied. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field scanning electron microscopy, TG-DSC studies were used to characterize the as-synthesized nanocomposite.The XRD analysis confirms the formation of mixed monoclinic/cubic nature of CuO@NiO nanostructures. FE-SEM image shows the formation of flower like hierarchical structures. XPS analysis were carried out to determine the oxidation state of Cu(2p),Ni (2p) and O (1s) states in the composite structure. Thermal decomposition of the composites were studied by TG-DSC analysis. Bio-synthesized CuO@NiO composite capped with PVP shows enhancement of thermal conductivity of 3 to 45% and 4 to 38% in base fluids water and ethylene glycol, respectively due to the interaction with the nanoparticles.
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