Dispersion / dispersing agent
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Definition of dispersant
A dispersion is a heterogeneous mixture of at least two substances that do not or hardly dissolve in each other or combine chemically. In this process, one substance (dispersed phase, disperse phase or secondary phase) is distributed as finely as possible in another substance (dispersant, dispersive continuous phase or main phase).
What dispersions are there?
In two-phase dispersions, depending on the aggregate states, there are altogether the following dispersion types:
Heterogeneity and homogeneity
Heterogeneity refers to the non-uniformity of the elements of a quantity or the constituents of a body. In contrast to heterogeneity is homogeneity. In a heterogeneous mixture, in contrast to a homogeneous mixture, the various particles can be distinguished by eye or with the aid of a microscope.
Classification according to particle size of the disperse phase
The disperse phase can be classified according to its particle size as follows:
Classification according to states of aggregation
The individual phases can be clearly separated from each other and usually separated again by physical methods (e.g. filtering or centrifuging). Examples of this are emulsions such as milk or aerosols such as mist. A mixture of gases is always homogeneous and therefore not a dispersion.
In an emulsion there is a finely divided mixture of two liquids such as oil and water. One liquid (phase) is distributed in small droplets in the other liquid.
https://de.wikipedia.org/wiki/Dispersion_%28Chemie%29, retrieved:September 24, 2019, 19:55 UTC
Dispersion, here emulsion: two liquids which cannot be mixed