Emulsion

Emulsions are the mixtures of two or more type of liquids where, one is such as droplets, of tiny or even ultramicroscopic size, which are distributed throughout each other. These are usually formed from the component of liquids either in natural form or, more often, using mechanisms such as the agitation, which is provided that these fluids mixed have no kind of mutual solubility.

Emulsions are said to be stabilized by some of the agents forming films at the surface of droplets or those which impart to them a kind of mechanical stability. The unstable form of emulsions eventually separates into two forms of liquid layers. The stable emulsions are destroyed by destroying or by inactivating the emulsifying agent—for example by the addition of appropriate third party substances or even by the process of freezing or by heating.

Some of the familiar emulsions are milk (where the dispersion of fat molecules or droplets in the aqueous solution) and also butter (which is the dispersion of droplets of particles of an aqueous solution in the fat).

What Is Emulsion?

An emulsion can be defined as a colloid consisting of two or more non-homogenous type of liquids wherein one of the liquid contains the dispersion of the different form of liquids.

Emulsion Examples

Oil and the mixtures of water are the emulsions when are shaken together. The oil forms drop and then disperses throughout the water.

The term emulsion is usually applied to a group of mixed systems called as solutions, or gels or suspensions. Take, For example, the photographic emulsion is a gelatin gel consisting of tiny crystals dispersed in it. Some other examples of emulsions include butter which is an emulsion of water in fat and egg yolk containing lecithin.

Properties Of Emulsions

  • Emulsions contain both a continuous and the dispersed with the boundary coming between the phases that are called “interface”.
  • Emulsions have a cloudy appearance due to many phase interfaces scattering light passing through the emulsions.
  • Emulsions appear in white colour when the light is dispersed in equal proportions.
  • If the emulsion is dilute, then higher-frequency and the low-wavelength type of light will be scattered in more fractions, and this kind of emulsion will appear in blue in colour.

Applications And Uses Of Emulsion

Emulsions are very much famous in various fields of science. It is utilized in the tanning and dyeing industries, used in the manufacturing process of plastics and synthetic rubber, employed in the preparation of different cosmetics like shampoos, and of therapeutic and salves products.


Practise This Question

Which one of the following is/are true in the formation of emulsion?

i) the liquid in larger proportion act as dispersion of medium

ii) the liquid with higher surface tension forms the dispersion medium

iii) the liquid in which the emulsifying agent is more soluble forms the dispersion medium

iv) an emulsion is formed by vigorous shaking of two immiscible liquids