Study Cards on inversion, surfactant, emulsion
- Catastrophic phase inversion --> adding more and more dispersed phase
- Transitional phase inversion --> properties of emulsion are changed from favouring droplets of the low-viscous phase to droplets of the high-viscous phase
- One starts with the phase that should become the dispersed phase. One then slowly adds the other phase (B) to phase (A), while the system is agitated. Droplets of phase B are formed, which are broken up into small droplets (agitation). However, you want A in B, so the surfactant system is dissolved in phase B and not in phase A.
- Emulsion becomes so concentrated and viscosity so high, that the droplets of B start to coalesce. B makes the continuous phase and A starts to be the dispersed phase.
- Final droplet size is usually not very small
- Emulsion can be rather polydisperse
Transitional --> surfactant affinity for both is equal
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