H

FIGURE 3.18 Influence of the volume fraction (^c) of colloidal particles on the attractive depletion interaction between emulsion droplets (rd = 1 |J,m, rc = 10 nm).

where §c is the volume fraction of the colloidal particles. The dependence of the interdroplet pair potential due to depletion effects on the droplet separation is shown in Figure 3.18. The interaction potential is zero at droplet separations greater than the diameter of the colloidal particles and decreases to a constant value when the droplets come into close contact.

Depletion interactions rely on the colloidal particles not interacting strongly with the surface of the emulsion droplets. Otherwise, the bound particles would have to be displaced as the droplets moved closer together, which would require the input of energy and therefore be repulsive.

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