The application of nanofluids is a relatively recent area of investigation that has shown promising results to improve the performance of thermal control device performance. Nanofluids, nanoparticles dispersed in regular working fluids (called a base fluid), exhibit improved thermal conductivity when applied in thermal systems. For example, by adding 5% by mass of nanoparticles to the working fluid, the liquid thermal conductivity can be increased by up to 20%.¹  Early work in this area has already presented important contributions using nanofluids, composed of water (as the base fluid) and copper oxide (CuO) nanoparticles with sizes of around 25 nm.^2–4  These investigations then proposed possible mechanisms of the enhanced thermal conductivity of nanofluids, with one of the important mechanisms being the formation of a solid-like nanolayer over the surface of nanoparticles, which acts as a connection between the solid nanoparticles and the base fluid.⁵  The investigations performed in the early stages of nanofluid development highlighted the potential in using them in several thermal control applications with great improvement in the heat transfer coefficient, especially when liquid single-phase thermal control was used. Such improvement was obtained using nanofluids circulating in a loop driven by a regular pump, which present different thermal behavior compared to systems where the nanofluid needs to go through an evaporation/condensation cycle.⁶