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Factors affecting the pH and electrical conductivity of MgO–ethylene glycol nanofluids
Adio, Saheed Adewale; Sharifpur, Mohsen; Meyer, Josua P.
The pH and electrical conductivity are important properties of nanofluids that have not been
widely studied, especially with regard to temperature and ultrasonication energy. To study the factors that
affect the pH and electrical conductivity of magnesium oxide–ethylene glycol (MgO–EG) nanofluid, the effects
of temperature, volume fraction, particle size and ultrasonication energy were investigated. Two different
sizes of MgO were dispersed in EG base fluid up to the volume fraction of 3%, and the pH and electrical conductivity
were monitored between the temperatures of 20 and 70°C. Characterization by transmission electron
microscopy and size analyses revealed the morphology and sizes of the nanoparticle samples. The pH values
dropped consistently with the increase of temperature, while electrical conductivity value increased with the
increase of temperature. The experimental result showed that the increase in the MgO volume fraction
increased both the pH and electrical conductivity values of the MgO–EG nanofluid. There was no recognizable
influence of ultrasonication energy density on the pH and electrical conductivity of the nanofluid; therefore, it
was concluded that temperature, volume fraction and particle size are the predominant factors affecting both
the pH and electrical conductivity of MgO–EG nanofluid within the present experimental conditions.