By the change in the volume ratio of the two liquid mixtures.Īn emulsion is a highly unstable system, which when kept for a more extended period, can cause separation of the two phases and results in “Phase inversion”.By keeping emulsion for a more extended period.Phase inversion: It can occur by the two factors: Solubility: An emulsion can be solubilized by adding liquid, which can be soluble with the continuous liquid phase.Įxample: A milk can solubilize by the addition of water.Ĭonductivity: The oil/water system shows high conductivity, and the water/oil system shows low conductivity. Texture: Oil in the water system looks watery, whereas water in the oil system looks oily. But, by the addition of an emulsifier, the formation of an emulsion can be achieved.Ĭolour: Due to the Tyndall effect, emulsions usually appears cloudy or white, ON the scattering of light by the suspended particles present in the liquid mixtures. Therefore, solubilizing the hydrophobic substance with the hydrophilic material is a tough task. Similarly, the hydrophilic or polar material will dissolve only with the polar molecules, not lipid molecules. In the O/W system, oil is hydrophobic (Water hating) substance, whereas water is hydrophilic (Water-loving).Īnd, as per the rule of “ Like dissolve like”, the hydrophobic or non-polar material will dissolve with the non-polar solvents only, not with the water. We can understand the types more efficiently by knowing the solubility of the two liquid systems. Water in oil refers to the type of emulsion when the water disperses in the continuous phase of oil.Oil in water refers to the type of emulsion when the oil disperses in the continuous phase of water.These are generally of two types, based on the continuous and dispersive phase of matter. Sometimes, the term “ Colloid” is interchangeable with the term emulsion. Emulsions are the standard type of colloidal systems which contains two or more insoluble liquid phases. In other words, from the two phases, one liquid phase will show the dispersion of the other. One will disperse from the two liquid phases, and the other will be in the continuous phase. The emulsion can be defined as a two-phase system that only contains the particles in the liquid phase of matter, where both are immiscible with each other. Preparation of emulsion is a popular method to produce healthcare, cosmetics, food products etc. The formation of emulsion strongly depends upon the volume ratio of the two liquid mixtures. It can be of two types, namely oil in water (O/W) and water in oil (W/O).
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