[Terminology] Dispersion system
Dispersion system consists of dispersed phase and dispersion medium (continuous phase).
Dispersion system can be divided into:
(1), Coarse dispersion system
The particle size is greater than 100nm or 1000nm.
(2), Colloidal system
The particle size is between 1 - 100nm or 1 - 1000nm.
Polymer true solution also belongs to colloidal system.
(3), True solution system
The particle size is less than 1nm.
Table 1 Some names of dispersion system
|
Dispersion medium |
Dispersed phase |
System name |
|
Gas |
Gas |
No dispersion system |
|
Gas |
Liquid |
Fog (Aerosol) |
|
Gas |
Solid |
Smoke (Aerosol) |
|
Liquid |
Gas |
Foam |
|
Liquid |
Liquid |
Emulsion |
|
Liquid |
Solid |
Sol Gel* |
|
Solid |
Gas |
Solid foam |
|
Solid |
Liquid |
Solid emulsion |
|
Solid |
Solid |
Solid dispersion |
*: It is generally believed that the gel is a bicontinuous phase structure, and the dispersed phase is a three-dimensional interconnected structure.