Interface and colloid science

Colloid chemistry is a branch of chemistry in which the production, characterization and modification of dispersed colloidal systems is paramount. Such systems consist of colloids, finely divided solid materials with particles in the size range of one millionth to a few thousandths of a millimeter. The particle is scattered as the disperse phase ( dispersion).

Colloidal solutions are between true solutions and suspensions; they show no osmotic pressure, no boiling point elevation and freezing point depression of no (so-called colligative properties).

In colloidal solutions flocculation ( coagulation) of many small particles would be expected to be energetically favorable, larger particles. This mutual absorption of the colloidal particles the electrostatic repulsion acts counter (hydrophobic colloids ), or the presence of large hydrate (hydrophilic colloids).

Hydrophobic colloids carry adsorbed charges, which is why they can be electrolytically gel ( electrophoresis). The addition of salts, the electrostatic repulsion of the colloidal particles is reduced, and they sit down as a precipitate or gel from (coagulation, flocculation ).

Hydrophilic colloids carry large hydration shells. Here, the coagulation can be achieved by the water -attracting agent.

Colloids, which prevent the flocculation of other hot protective colloids, such as dextrin. In plant and animal body many active ingredients are present in colloidal solution.

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