Abstract
The solution properties of mixed amphoteric-nonionic surfactant systems in aqueous solutions were studied in terms of Krafft points and surface tension. The systems examined were Nα, Nα-dimethyl-Ne-acyllysine (DMLL) -alkyl poly (oxyethylene) ethers (CmPOE20; m=12, 14, 16 and 18). The Krafft point of DMLL decreased with increasing molar ratio of CmPOE20, becoming less than 0°C at a certain molar ratio. The Krafft point of DMLL mixed with a nonionic surfactant possessing a long alkyl chain was lower than that mixed with nonionic surfactant with a short alkyl chain. The surface tension of each mixed surfactant solution decreased with increasing concentration of DMLL. The cmc values of the mixed systems decreased with increasing to alkyl chain length of CmPOE20. These properties attributed to increased molecular interaction between DMLL and CmPOE20 in mixed micelles with increasing alkyl chain length in nonionic surfactants.
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