Stability and Thermophysical Properties of Reduced Graphene Oxide-Gold Hybrid Nanofluids

The reduced graphene oxide/gold (rGO-Au) hybrid nanofluids are prepared by chemical method with hyperbranched polyglycerol as the stabilizer. The reduction of GO and attachment of the Au nanoparticles to it was evident from all the characterizations. The hybrid nanofluids in the presence of hyperbranched polyglycerol displayed good stability that can keep stable without agglomeration for more than 6 months. The influence of pH values and temperature on the preparation and stability of hybrid nanofluids were studied. The stability of rGO-Au hybrid nanofluids prepared in different pH was different. The thermal conductivity of the nanofluids increased with increase in temperature and concentration of the nanofluid. The preparation and study of the rGO-Au hybrid nanofluid is beneficial for the applications in the fields of thermal management.