Colloids can be classified on:
1. The basis of physical state of dispersed phase and dispersion medium
Each of the dispersed phase and the dispersion medium can be a solid or liquid or gas. There are eight different combinations possible.
|#||Dispersed Phase||Dispersion Medium||Name||Example|
|1||Solid||Solid||Solid Sol||Coloured glass, alloys. gems.|
|2||Solid||Liquid||Sol||Paints, inks. white of egg, colloidal Au,|
|4||Liquid||Solid||Gel||Curds, cheese, jelly, pudding.|
|5||Liquid||Liquid||Emulsion||Milk, butter. oil in water.|
|6||Liquid||Gas||Aerosol||Mist, fog, clouds.|
|7||Gas||Solid||Solid foam||Cake, bread, pumice stone.|
|8||Gas||Liquid||Foam||Soap lather, aerated water.|
A colloidal solution with both the components in the gaseous state is not possible as according to Grahams Law of diffusion, they form a homogeneous mixture.
2. Classification on the basis of appearance:
|1||When a colloidal solution appears a fluid, it is termed as sol. Sols are named after the dispersion medium.||When a colloid has a solid like rigid appearance it is called gel. The rigidity of a gel varies from substance to substance. Some substances may occur both as sols as well as gels. This depends upon the relative concentrations of the dispersed phase and dispersion medium.|
|2||For example when dispersion medium is water, they are called hydrosols, if dispersion medium is alcohol they are called alcosols and if it is benzene, they are called benzosols.||A gel is formed by interlocking of the dispersed phase particles. Gelatine dissolves in warm water to form a colloidal solution which sets into a gel.|
3. Classification on the basis of solvent affinity
|#||lyophilic Sol (solvent loving):||lyophobic sol (solvent hating):|
|1||When the dispersion medium exerts an attraction on the dispersed phase then we get lyophilic Sol (solvent loving).||When the attraction between the dispersion medium and the dispersed phase is very little then the sol is called lyophobic sol (solvent hating).|
|2||Examples of lyophilic (reversible) sols: Protein, starch, glue, gelatine and agar-agar give reversible colloidal system with water. Rubber in benzene is also a reversible colloidal system.||Typical examples of lyophobic sols (non-reversible): Metals, sulphur, sulphides, silver halides, egg albumen, silicic acid and ferric hydroxide give non-reversible colloidal systems with water.|
Shared publicly - 2019-08-23 00:00:00
Don’t want your columns to simply stack in some grid tiers? Use a combination of different classes for each tier as needed. See the example below for a better idea of how it all works.
Shared publicly - 2019-08-24 00:00:00
For grids that are the same from the smallest of devices to the largest, use the .col and .col-* classes. Specify a numbered class when you need a particularly sized column; otherwise, feel free to stick to
Shared publicly - 2023-02-28 11:09:52
Shared publicly - 2023-02-28 10:48:10
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