Abstract
Results of drops dimension and rheological properties of the produced multiple emulsion are presented in this paper. Sunflower oil (oil phase), distilled water (liquid phase), and lecithin from soya beans were used as materials to produce emulsion. Emulsions were produced in vessel with inner diameter D = 0.1 m and liquid height H = 0.5D. Smith turbine has been used to stir the emulsions. Examination of the drops dimension and rheological properties were conducted for emulsions collected after 15 min and 45 min of stirring as well as after the 3rd and 30th day. There were 6 measurements altogether. To do the analysis of drops dimension, in each series 700–800 inner oil-phase drops were taken. The results were presented in a form of graphics as a distribution of drops. The dimensions of the drops obtained d were also presented as a minimal diameter dmin, arithmetic mean diameter da, median dm, and Sauter mean diameter d32. The results of the research of rheological emulsions were presented graphically as a viscosity curve and they were described by Herschel–Bulkley model (Eq. 4)
Highlights
Double emulsions are systems, where the inner phase contains outer-phase droplets
In emulsions water in oil in water (W/O/W) the water phase is dispersed in oil phase, whereas in oil in water in oil (O/W/O) emulsions the oil phase is dispersed in water phase
The interim phase creates a peculiar kind of membrane between two identical phases. Another kind of double emulsions is the one in which two different water phases marked as W1/O/W2 or two different oil phases (O1/W/O2) were applied
Summary
Double emulsions are systems, where the inner phase contains outer-phase droplets. In emulsions W/O/W the water phase is dispersed in oil phase, whereas in O/W/O emulsions the oil phase is dispersed in water phase. In both cases, the interim phase creates a peculiar kind of membrane between two identical phases. The interim phase creates a peculiar kind of membrane between two identical phases Another kind of double emulsions is the one in which two different water phases marked as W1/O/W2 or two different oil phases (O1/W/O2) were applied. It is necessary to remember, that liquids used during emulsions creation cannot dissolve in themselves
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