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Surface active agent  

Surface active agent (Surfactant) refers to the substance which can results in a significant change in the interface state of the solution system with the addition of a small amount of it. With the possession of a fixed hydrophilic and lipophilic group, it can be aligned on the surface of the solution. The molecular structure of the surfactant is amphiphilic: a hydrophilic group is on one end and the other end is a hydrophobic group; the hydrophilic group is usually a polar group such as carboxylic acid, sulfonic acid, sulfuric acid, amino group, amine group and the salt, and the hydroxyl group, amide group, ether bond and the like can also serve as polar hydrophilic group; and the hydrophobic group is often a non-polar hydrocarbon chain, such as a hydrocarbon chain of more than 8 carbon atoms. Surfactants can be classified into ionic surfactants (including cationic and anionic surfactants), nonionic surfactants, amphoteric surfactants, compound surfactants and other surfactants.

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