88.5 Surfactants and their properties and Applications 8.5.1 Surfactants (1)Classification by structure/active moiety hydrophilic group CooH carboxyl anon I-OSO3H, sulphate IonIc cationic SO3 H, sulphonic acid NR4, ammonium amphoteric -CH2-CH2-O, poly-ethylene oxide etc. ester ether I hydrophobic group nonionIc I(CH2) (CF2) amide I(SiR2-O-) 4(CH2-CH2-CH2-0-)n nonionic-cationic nonionIc-anionIc branched linear or aromatic8.5.1 Surfactants (1) Classification by structure/active moiety branched, linear, or aromatic §8.5 Surfactants and their properties and Applications