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Friday, March 31, 2017

Types of colloidal solution

1. Depending on dispersion medium and dispersed phase:

Dispersion medium
Dispersed phase
Type of colloid

Solid
Solid
Solid sol Ex: gem stones, glasses
Liquid
Gel Ex: cheese, butter, gelatin
Gas
Solid foam Ex: pumice stone

Liquid
Solid
Sol Ex: paints, ink, blood
Liquid
Emulsion Ex: milk, mayonnaise, hand cream
Gas
Foam Ex: whipped cream, shaving cream

Gas
Solid
Solid aerosol Ex: smoke, ice cloud, atmospheric particulate matter
Liquid
Liquid aerosol Ex: fog, hair sprays, mist, cloud
Gas
None All gases are miscible and thus do not form colloids

Examples: 


2. Based on nature of interaction between dispersed phase and dispersion medium:

a. Lyophobic
b. Lyophilic

a. Lyophobic:

Liquid-hating
Colloidal solutions in which dispersed phase has very little affinity for the dispersion medium.
Form precipitates on adding small amounts of electrolytes
These are less stable and irreversible in nature.
These are also called suspensoids.

b. Lyophilic:

Liquid loving
Dispersed phase has great affinity for dispersion medium.
These are stable and reversible in nature. These are also called emulsoids. 
The colloidal solutions are also named according to the dispersion phase or medium used.

Dispersion Medium
Name of Colloidal Solutions
Water
Hydrosols
Alcohol
Alcosols
Benzene
Benzosols
Air
Aerosols

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