COLLOIDS

Colloid is a mixture of the situation between the solution and suspension. Colloidis a heterogeneous system, in which a substance is "dispersed" into ahomogeneous medium. The size of the dispersed substances range from onenanometer (nm) up to one micrometer (μm).

If we mix the milk (eg, instant milk) with water, milk was "late" but the "solution" isnot clear but murky. If ignored, the mixture was not separated and can not beseparated by filtration (screening results remain murky). In the macroscopicmixture looks homogeneous. However, if observed with a microscope ultra wasstill distinguishable particles of milk fat dispersed in the water. Mixture like this iscalled a colloid.

Thus, colloidal mixture of heterogeneous and are classified as two-phase system.Didipersikan substance that is called the dispersed phase, while the medium used to disperse the substance is called the dispersion medium. Dispersed phase is discontinuous (intermittent), while the dispersion medium is continuous.In the milk mixture with water, the dispersed phase is fat, while the dispersionmedium is water.

TYPES OF COLLOIDS

classification system based on the type of colloidal dispersed phase and phase dispersing its phases.
                                                          Types of Colloids

No.	Dispersed Phase	Dispersing its Phase	Name	Example
1.	Solid	Gas	Aerosol	air, dust, and smoke
2.	Solid	Liquid	Sol	paint and ink
3.	Solid	Solid	Solid Sol	colored glasses and a black diamond
4.	Liquid	Gas	Aerosol	Fog and Cloud
5.	Liquid	Liquid	Emulsion	Milk, fish oil
6.	Liquid	Solid	Solid Emulsion	Gels, pearl
7.	Gas	Liquid	Foam	Liquid soap
8.	Gas	Solid	solid foam	stirofoam