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Photonics Dictionary

colloid

A colloid is a mixture in which one substance of microscopically dispersed insoluble particles is suspended throughout another substance. The particles in a colloid are larger than those in a solution (typically ranging from 1 nanometer to 1 micrometer in diameter) but are small enough that they do not settle out upon standing and cannot be separated by ordinary filtering or centrifuging.

Dispersed phase: The substance that is dispersed in the mixture (e.g., solid particles, liquid droplets, or gas bubbles).

Continuous phase: The substance in which the dispersed phase is distributed (e.g., liquid, gas, or solid).

Tyndall effect: The scattering of light by the particles in a colloid, which makes the path of the light visible.

Brownian motion: The random movement of particles in a colloid due to collisions with the molecules of the continuous phase.

Examples of colloids include milk (liquid in liquid), fog (liquid in gas), and jelly (solid in liquid).

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