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| Colloids |
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| It is well known, that solutions are homogenous systems while suspensions are heterogeneous systems, i.e., they consist of more than one phase. In between the extremes of suspensions and solutions lies the colloidal system. |
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| Colloids appear homogenous like a solution, but they consist of comparatively large particles of one substance dispersed throughout another substance (dispersion medium). The essential difference between a solution and a colloid is one of particle size. |
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| 1) In a solution, the particles are ions or small molecules. |
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| 2) In a colloidal system, the dispersed phase may consist of particles of a single macromolecule or an aggregate of many atoms, ions or molecules. Although colloidal particles are larger than simple molecules, they are small enough to remain suspended. Colloidal particle sizes range from about 10Ao to about 1000 Ao i.e., 1nm to 1000 nm. |
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