Question

Write short notes on Colloid mill.

Answer 1

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A colloid mill is a machine that is used to reduce the particle size of a solid in suspension in a liquid, or to reduce the droplet size of a liquid suspended in another liquid. Colloid mills work on the rotor-stator principle: a rotor turns at high speeds (2000 - 18000 RPM[]). The resulting high levels of hydraulicshear applied to the process liquid disrupt structures in the fluid. Colloid mills are frequently used to increase the stability of suspensions and emulsions, but can also be used to reduce the particle size of solids in suspensions[]. Higher shear rates lead to smaller droplets, down to approximately 1 µmwhich are more resistant to emulsion separation.

Colloid mills are used in the following industries:

Pharmaceutical

Cosmetic

Paint

Soap

Textile

Paper

Food

Answer 2

Ans:

Colloids (also known as colloidal solutions or colloidal systems) are mixtures in which microscopically dispersed insoluble particles of one substance are suspended in another substance. The size of the suspended particles in a colloid can range from 1 to 1000 nanometres (10-9 metres). For a mixture to be classified as a colloid, its suspended particles must not settle (in the manner that the particles of suspensions settle at the bottom of the container if left undisturbed). Colloidal solutions are known to exhibit the Tyndall Effect, which is a phenomenon in which beams of light incident on colloids are scattered due to the interactions between the light and the colloidal particles.

Explanation:

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