Journal of Nanomaterials / 2016 / Article / Tab 1

Review Article

A Review on Properties, Opportunities, and Challenges of Transformer Oil-Based Nanofluids

Table 1

Basic properties of conducting, insulating, and semiconducting nanoparticles [26].

Magnetite
(Fe3O4)
Zinc oxide
(ZnO)
Alumina
(Al2O3)
Quartz
(SiO2)
Silica
(SiO2)
Titania
(TiO2)

Density (g/cm3)5.175.613.962.652.204.2–4.3
Electric conductivity (S/m)10–
Relative dielectric constant807.4–8.99.93.8–5.43.8100
Relaxation time constant (s)12.236.377
Thermal conductivity (W m−1K−1)4–823.43011.11.4
Thermal expansion coefficient
at 20°C (µm m−1K−1)
9.22.98.130
Specific heat (J kg−1K−1)494850670

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