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Nanofluids as a quite new group of nanomaterials are very promising. A great potential of nanofluids was noted in second half of twentieth century and it was related with high increase of thermal conductivity. The most favourable effects of using nanofluids can be achieved in heat transfer systems, but also in other branch of industry like car, energy, and mining industry, even biomedicine industry. This paper presents results of experimental investigation of electrical conductivity of nanosuspension containing indium oxide nanoparticles dispersed in ethylene glycol. Five samples with volume fraction in the range 0.0016-0.0081 were prepared using two-step method. After preparation, all samples were impatiently investigated in controlled temperatures in the range from 298.15 K to 333.15 K. Measurement were conducted using conductivity meter MultiLine 3630 working with conductivity probe LR925/01 (WTW GmbH, Weilheim, Germany). Obtained results indicate that changes in volume concentration and temperature have strong impact on electrical conductivity of In2O3-EG nanofluids.

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Nanofluids, which are suspensions of nanoparticles, are interesting engineering materials, which might find numerous applications in industry. Unfortunately, there is no coherent theoretical model describing viscosity of nanofluids and further experimental and theoretical studies of this issue should be performed. This paper makes a contribution to this field. Dynamic viscosity of ethylene glycol based nanofluids containing indium oxide nanoparticles was measured in shear rate range from 10 s −1 to 1000 s −1 at constant temperature. It was presented that those materials exhibit Newtonian nature. Viscosity increases with the volume fraction of particles in nanofluids, and the Krieger-Dougherty equation could be applied to describe this increase. Additionally, a dependence of viscosity on temperature was examined in the range from 278.15 K to 338.15 K with constant shear rate 100 s −1 .

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