Creaming is not an actual breaking but a separation of the emulsion into two emulsions, one of which (the cream) is richer in the disperse phase than the other.
In Oil in Water emulsions, use emulsifying agents that are more soluble in water than in oil (High HLB surfactants). The Hydrophilic-Lipophilic Balance (HLB) of a surfactant can be used in order to determine whether it is a good choice for the desired emulsion or not. So even though there may be a formula that is 60% oil and 40% water, if the emulsifier chosen is more soluble in water, it will create an oil-in-water system. Provide surface charge which causes repulsion between adjust particles.Īs per the Bancroft rule, the emulsifying agent is used in an emulsion should be favorable to the external phase of the emulsion.Form a coherent monolayer to prevent the coalescence of two droplets when they approach each other.The functions of surface-active agents to provide stability to dispersed droplets are as follows: Upon the addition of SAA, they tend to form monolayer film at the oil/water interface. The surface-active agent (SAA) is a molecule which has two parts, one is hydrophilic and the other is hydrophobic. Therefore, to prevent the coalescence and separation, emulsifying agents have been used. This is manifested as interfacial energy or tension at the boundary between the liquids. In the case of two immiscible liquids, the cohesive force between the molecules of each separate liquid exceeds the adhesive force between two liquids.
WATER IN OIL EMULSION PHARMACY DRUG FULL
The secondary emulsion also called multiple emulsion contains two internal phases, for instance,Ĭlick on the link given below and read the full article: Identification Test For Emulsion Theories of Emulsification A primary emulsion containing one internal phase, for example,
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