Prof. Abd Karim Alias
Universiti Sains Malaysia
Mechanisms of Emulsion Instability
Emulsion stability – ability to resist changes in its physicochemical properties with time.
Mechanisms of emulsion breakdown:
Creaming – the process in which droplets move upwards (droplets density < density of continuous phase)
Sedimentation – the process in which droplets move downwards (droplets density > density of continuous phase)
Mechanisms of emulsion breakdown (..cont’):
Flocculation– the process in which two or more droplets “stick” together to form an aggregate (but the droplets still retain their individual integrity)
Coalescence – the process in which two or more droplets merge together to form a single larger droplet.
Phase inversion – the process in which o/w emulsion changes to w/o emulsion, or vice versa.