showing that surface tension stays roughly constant up to ∼70% glycerol content, and then ramps up very rapidly to high values (Figure ). The surface tension of glycerol is three times higher than that of pure i-PrOH. Thus, there will be a significant gradient in surface tension across the meniscus due to i-PrOH evaporation. The evaporation rate is initially constant, decreasing linearly while enriching the system in glycerol, and then decreases as the system becomes significantly enriched in glycerol (Figure ). Thus, there is a gradient in surface tension, viscosity, and evaporative flux during the drying process.