There are no strict boundaries on the size of colloidal particles, but they tend to vary between 10-9 m to 10-6 m in size.

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There are no strict boundaries on the size of colloidal particles, but they tend to vary between 10-9 m to 10-6 m in size.

Figure 17.22: The Tyndall effect Source: Stock Boston

Figure 17.23: Representation of two colloidal particles

Type of Colloids Dispersing medium Dispersed phase Name Solid Solid sol Liquid Gel Gas Solid foam Sol Emulsion Foam Solid aerosol Aerosol

Aerosols: Man-made: Aerosol sprays, insecticide spray, smog. Natural: Fog, clouds. Solid aerosol: Natural: Smoke, dust. Foam: Man-made: Shaving lather, whipped cream. Emulsions: Man-made: Mayonnaise, cosmetic lotion, lubricants. Natural: Milk. Sols: Man-made: Paint, ink, detergents, rubber (a latex - also occur naturally). Solid foams: Man-made: Marshmallow, styrofoam, insulation, cushioning. Gels: Man-made: Butter, jelly. Solid sols: Man-made: Certain alloys. Natural: Pearl, opal. Biological macromolecules and cells may be considered to be biocolloids and many foods are also colloidal in nature. Colloids are also an important feature of the natural environment.

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