- Feb 06, 2018 -
The surfactant can reduce the surface tension of water by adsorption on the gas-liquid two-phase interface, and also decrease the interfacial tension of the oil by adsorption in the liquid interface. Many surfactants can also be assembled into aggregates in the solution of the body.
Surfactant through the different parts of the molecule for the affinity of the two phases, so that the two phases are considered as the truth of the composition, the molecules arranged between the two phases, so that the surface of the two phases into the molecular interior. Thus reducing the surface tension. Since the two phases are regarded as a component of the truth, the equivalent of two phase and surfactant molecules do not form an interface, which is equivalent to partially eliminating the two-phase interface in this way, reducing surface tension and surface free energy.
There are many classification methods of surfactants, according to the structure of hydrophobic base classification, divided into straight chain, branched chain, aromatic chain, fluorine-bearing chains, etc. according to the hydrophilic basis of classification, divided into carboxylic salts, sulfate, quaternary ammonium salt, peo derivative, lactone, etc. some researchers, based on the ionic nature of their molecules, are divided into ionic and non-ionic types, And according to its water solubility, chemical structure characteristics, source of raw materials and other classification methods.