Investigation on stability of TiO₂-SiO₂ nanofluids with ratio (70:30) in W/EG mixture (60:40)

Nowadays, thermal energy is essential to the protection of the renewable technology ecosystem in the world. Most researchers study nanofluid related to increased demand for thermal energy, which includes the heating and cooling process. The goal of this analysis was therefore to determine the stability of TiO₂-SiO₂ nanofluids (70:30) suspended in W/EG (60:40). This study will help researchers gain insight into the impact of nanoparticle stability on hybrid nanofluids, which will enable researchers to add nanoparticles to solar collector. TiO₂-SiO₂ nanofluids with ratio 70:30 was prepared using a one-step process at a volume concentration of 0.3, 0.5, 0.7, and 1.0%. Two of nanoparticles are used, namely TiO₂ and SiO₂, and distributed in the base W/EG mixture (60:40). The stability investigation of hybrid nanofluids in this research is performed by UV-Vis, visual sedimentation. The findings from this investigation is stability analysis of hybrid nanofluids by UV-Vis process, which is stable up to 10 days after preparation with 2-hour sonication time. For concentration ratio of 1.0% of the volume concentration of hybrid nanofluids. The optimal absorbance value is 2.3 after 24 hours, which is the ideal consistency of the fluid. Concentrations of 0.3, 0.5 and 0.7% begin to decrease after 24 h and continue to decrease until 10 days (240 h).