They remain in suspension in the dispersed phase due to this repulsive force. Repulsion theory – The emulsifying agent forms a film over one phase, forming globules that repel each other, according to the repulsion theory.Surface tension theory – This theory states that emulsification occurs when the surface tension between two stages is reduced.The process of emulsification can involve a variety of chemical and physical processes. Acacia, tragacanth hydrocolloids and glycerine are some of the common examples of the emulsification processes. ![]() The viscosity of the medium is increased by certain emulgents, enabling the granules to stay suspended.An emulsifier can form a film above one phase of a mixture, resulting in blobs that subdue each other and stay distributed evenly or are suspended.When the contact surface tension between two liquids is reduced, emulsification can occur.The table below shows the types of mixtures that are formed when a dispersed phase is combined in a dispersed medium :. Other types of emulsions are butter, a water-in-fat emulsion, and lecithin in egg yolks. One example is a photographic emulsion, a gelatin gel with tiny crystals dispersed throughout. Types of mixturesĪ group of blended systems, such as gels, suspensions or solutions can also be referred to as emulsions. Hence, not every colloid is an emulsion but every emulsion can be categorised as a colloid. Sometimes, the word colloid and emulsions are used together however, it is important to note that for an emulsion both the combining agents are in the liquid phase while for a colloid the combining agent can be of any medium. Emulsification is the process that turns mixtures into an emulsion. The word emulsion is derived from the Latin word ‘emulsus’, which means ‘to milk’. To put it in another way, an emulsion is a unique type of mixture made by mixing liquids that normally do not mix. ![]() EmulsionĪ colloid of two immiscible liquids in which one fluid contains a dispersion of the other fluid is known as an emulsion. Furthermore, emulsions are also used in manufacturing processes in industries. A lot of emulsions used are man-made and created to perform specific functions. An emulsion is an important type of colloid used for various purposes in daily life. There are various mixtures in Chemistry made by combining different substances having different or similar mediums.
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