14 September 2020 7 4K Report

I have experimentally prepared thermal oil-based NF at different concentrations of particles. While measuring the zeta potential for the NFs, I got both +ve and -ve values for one particular hybrid nanofluid (CuO-TiO2/Thermal oil). It showed +ve value at low concentration (0.025wt%) but resulted -ve vales at higher concentrations (0.075-0.125wt.%). Is it bcz of the repulsion forces at higher particle loading? Please share your thoughts on that. Similar references would be appreciated regarding the question.

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