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Aluminum oxide (alumina) is a common material that has a wide range of applications. It has many desirable properties like good electrical insulation, high mechanical strength, and high hardness. In addition to these characteristics, it has a relatively high thermal conductivity for a ceramic material (about 30 - 35 W/mK) and is highly resistant to corrosion.
Aluminium oxide can also be a very useful conductor on a large scale because of its low weight and relative ease of processing. This material is often used to wire semiconductor chips and transistors, but it can also be used to form a protective oxide layer on other metal products to increase corrosion resistance.
Alumina particles are stable when suspended in water because the electric charge on their surfaces develops on the polarity of the liquid. Hence, this property is exploited to improve the electrical conductivity of colloidal nanosuspensions.
Different volume fractions of Al2O3 were stabilized by sodium dodecylbenzenesulfonate (SDBS) dispersant agent by ultra-sonication method and the stability of the prepared nanofluids was studied. Moreover, the zeta potential of dispersed Al2O3 was measured using Malvern ZS Nano Sizer Analyzer (Marlvern Instrument Inc., London, UK) to verify the stability of the prepared nanofluids.
XRD analysis of the samples showed that the mean size of alumina inclusions varied depending on the addition procedure (gelatin method-GS series; impregnation-IS series) and the amount of added alumina. The tetragonal phase was the dominant phase in all studied samples, with minor amounts of the monoclinic phase.
