Geranyl acetate emulsions: surfactant association structures and emulsion inversion.

Three emulsions of geranyl acetate (GA)-in-water (W) with identical GA/W ratios and varying surfactant (S), Laureth 4, a commercial C(12)EO (4) compound, fractions were investigated for nature and stability. The emulsions with up to 6% surfactant were W/O, as expected with respect to the solubility of the surfactant in the oil. At 10% surfactant, the aqueous phase became the continuous one and the apparent stability of the emulsion was significantly enhanced.

Constant vapor pressure emulsions evaporation: Linalool/water stabilized by Laureth 4.

Evaporation paths were calculated in the title system using the relevant part of its published phase diagram and the assumption of equilibrium between vapor and liquids. The vapor pressure of linalool was reduced while the emulsion resided in the two-phase region but remained constant within the three-phase range. The duration of the time for constant vapor pressure depended on the relative humidity (RH) to a surprising degree.