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Synthesis and Characterization of Al2O3 Nanoparticles and Water-Al2O3 Nanofluids for Nuclear Reactor Coolant

A study on synthesis and characterization of Al2O3 nanoparticles for water-Al2O3 nanofluids as an alternative nuclear coolant has been done. The Al2O3 nanoparticles were synthesized from AlCl3 using sol gel method utilizing sugar as chelating agent. The Al2O3 nanoparticles were mixed with water to produce nanofluids. XRD data showed that the Al2O3 nanoparticles crystallize in gamma alumina with crystallite size of 5.5 nm (Debye Scherrer method). Surface area of the Al2O3 nanoparticles was 90 m2/gram. Data of TEM showed that the particle size was smaller than 10 nm and the nanoparticle formed agglomerate with size of 60-100 nm. According to zeta potential data, the nanofluids were stable at pH 2.6-7.5 with zeta potential of 28-51 mV. The height of the nanofluid surface decreased about 20 % after 6 days. The thermal conductivity of the water-Al2O3 nanofluids produced in this study increased about 2.4-9.7 % compared to that of water.