Depletion interactions are important when the continuous phase of an emulsion contains a significant concentration of small colloidal particles, such as surfactant micelles or nonadsorbing biopolymers (Dickinson and McClements 1995, Jenkins and Snowden 1996). The interdroplet pair potential for a system in which depletion interactions are important is given by:
w(h) = wVDW (h) + Welectrostatic (h) + wdepletion (h) (3.33)
The variation of the interdroplet pair potential with droplet separation for this type of system is shown in Figure 3.27. At low concentrations of colloidal particles, the energy barrier is sufficiently large to prevent the droplets from falling into the primary minimum. As
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