Abstract
A study on synthesis and characterization of A12O3 nanoparticles from bauxite for water-A12O3 nanofluids as an alternative coolant for nuclear and non-nuclear applications has been done. The A12O3 nanoparticles were synthesized by heating AlOOH as a precursor derived from local bauxite. The Al2O3 nanoparticles were dispersed in water and ultrasonicated to produce nanofluids. XRD data showed that the A12O3 nanoparticles crystallized in gamma alumina with crystallite size of 4.5 nm (Debye Scherrer method). Surface area of the A12O3 nanoparticles was 195 m2/gram. Data of TEM showed that the particle size was smaller than 10 nm. According to zeta potential data, the nanofluids were stable at neutral pH of 7.3 with zeta potential of 28-51 mV. The height of the nanofluid surface decreased about 13 % after 6 days. In addition, the CHF of the water-A12O3 nanofluids produced in this study increased about 55-161 % compared to that of water.
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