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Observational analysis reveals that surfactants affect the splitting of liquid film in mist aerosols, suggesting a role in formulation dynamics.
We examine the effect of surfactants on spray characteristics of mist aerosol containing oil-in-water (O/W) emulsions to evaluate the mechanism on the splitting of liquid film sprayed from mist aerosol containing O/W emulsions as mist aerosol formulation. We proposed that the splitting of liquid film sprayed from mist aerosol containing O/W emulsions as mist aerosol formulation was attributed to the adsorption of oil droplets to air/water interface in liquid film sprayed from mist aerosol. The splitting of liquid film sprayed from mist aerosol containing O/W emulsions differed with type of surfactants. This indicates that the adsorption of oil droplets to air/water interface in liquid film sprayed from mist aerosol is controlled by surfactants. We also found that the prompt adsorption of surfactant molecules themselves to air/water interface enhanced the splitting of liquid film sprayed from mist aerosol. Namely, the prompt adsorption of oil droplets and surfactants to air/water interface in liquid film leads to the earlier splitting of liquid film, and the resulting larger angle and area of mist sprayed from mist aerosol containing O/W emulsions.
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Yumoto et al. (2025) studied this question.
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