Evaporation of high-volatile binary sessile drop: Influence of concentarion

The evaporation of binary mixture drops has shown significant potential for industrial applications in the past decades. While the majority of scientific research was devoted to water-based mixtures In this study, we aimed to investigate the impact of component concentration and volatility on binary drop evaporation. Specifically, drop evaporation experiments were conducted on Ethanol-HFE7100 and Isopropanol-HFE7100 mixtures, and WaterEthanol and Isopropanol-Ethanol mixture are selected as the comparison. A strong selective evaporation effect was observed. The evaporation behavior of each mixture was found to occur in three distinct stages. Notably, the HFE7100 component was found to evaporate during the entire lifetime of the Ethanol-based mixture, with domination in the first stage. In contrast, the Isopropanol-HFE7100 mixture exhibited as two independent fluids at moderate concentrations of HFE7100, with the HFE-7100 component evaporating only during the first stage and pure Isopropanol evaporating during the last stage. These findings hold potential for various industrial applications.