Surfactants are amphiphilic substances which have their hydrophilic and hydrophobic structural parts. A surfactant can be classified by the presence of charged groups. A nonionic surfactant has no charge groups in its head. The head of an ionic surfactant carries a net charge. If the charge is negative, the surfactant is more specifically called anionic; if the charge is positive, it is called cationic. If a surfactant contains a head with two oppositely charged groups, it is termed zwitterioni...
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