Oxidation stability and viscosity properties of environmentally friendly Al2O3 nanofluids
Corn oil as a nanofluid base fluid has the problem of easy oxidation,and the addition of tertiary butyl-hydroquinone is expected to improve the antioxidant property of corn oil.In this paper,a new environmentally friendly nanofluid was prepared by using corn oil as a base fluid,Al2O3 as nanoparticles,and tertiary butylhyd-roquinone as an antioxidant to study its settlement stability and antioxidant properties.The content of oxidation products and viscosity of the nanofluids at different times were investigated from the perspectives of particle size,particle mass fraction,antioxidant type,and antioxidant addition.The results showed that the nanofluids produced without surfactant,100 mL of corn oil.Al2O3 nanoparticles with a particle size of 20 nm and a particle mass fraction of 1.1083％had the best sedimentation stability.The nanofluid with 0.7％of tertiary butylhydro-quinone added had the optimum antioxidant properties.There are two phenolic hydroxyl groups in the molecule of tertiary butylhydroquinone,and each of the two phenolic hydroxyl groups provides one hydrogen ion,which forms stable quinone compounds in corn oil,making the oxidation rate of the corn oil slower.When the content of tertiary butylhydroquinone was added at less than 0.4％,the content of tertiary butylhydroquinone was not e-nough to effectively retard the oxidation reaction of the oil.When the addition of tertiary butylhydroquinone ex-ceeded 0.7％,the antioxidant property of the nanofluid could only be improved slightly,and the oxidation in-duction time increased slowly,but on the contrary,the viscosity of the nanofluid would be increased greatly.The nanofluid prepared in this paper has the characteristics of environmental friendly and good antioxidant per-formance,which can effectively slow down the generation of oxidised substances.This study contributes to the further development of antioxidant research of environmentally friendly nanofluids.
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