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Molecular structure (a) ether carboxylic derivative surfactants, EC-R8E8, EC-R12–14E3, EC-R12–14E10, (b) amine-oxide-based surfactants, AO-R14 and AO-R12, (c) amine-oxide-based surfactant, AO-Cocoamido. R: length alkyl chain; E: ethoxylation degree, R’:R12.
