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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