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Synthesis and Characterization of Graphene Nanoplatelets & Graphene Oxide Based Nanofluids With Their Comparative Analysis for Heat Transfer Applications

Suman Devi

Abstract


Stability and thermal conductivity are the main features of nanofluids. Higher concentration of nanoparticles become the reason of agglomeration, so a balance equation is required for the preparation of remarkable nanofluids in the application point of view. In the present study, we describe a novel synthesis of graphene Nanoplatelets and graphene oxide based nanofluids with different concentration (0.001,0.003,0.005wt %) with the help of stock solution of 1mg/ml. The Hummer’s method is used to functionalize the graphene for the preparation of nanofluids. Graphene Nanoplatelets based nanofluid is formed by dispersing the GNP in DI water with the help of probe sonicator with 80% amplitude and 20KHz frequency. Nanofluids were characterized by UV-Vis, Raman, and SEM. Thermal conductivity of these nanofluids was measured by KD2 Pro Analyzer. UV spectroscopy confirms the stability of nanofluids. Thermal conductivity is measured with KD2 probe and found near about 120% enhancement in the case of GNP based nanofluids and 73% in the case of GO. From the comparative study of both types of fluids that Graphene Nanoplatelets based fluid shows higher thermal conductivity than the graphene oxide based nanofluid due to its pristine thermal conductivity.

Keywords


Nanofluid, Graphene, nanoplatelets, UV thermal conductivity

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