Study on the interaction between cationic gemini surfactant and anionic polyelectrolyte

The interactions between cationic gemini surfactant hexylene-1,6-bis(dodecyldimethylammonium) dibromide (C12H25(CH3)(2)N-(CH2)(6)-N(CH3)(2)C12H25 center dot 2Br) (12-6-12 center dot 2Br(-)) and oppositely charged polyelectrolyte poly(arylic acid, sodium salt) (NaPA) have been studied by using fluorescence and conductivity measurements. It was shown that micelle-like aggregate or complex could be formed between the gemini surfactant (12-6-12 center dot 2Br(-)) and polyelectrolyte NaPA due to the static electric interaction. Comparing the fluorescence spectrum of system of dodecyltrimethylammonium bromide (DTMAB) with NaPA and that of system of gemini surfactant (12-6-12 center dot 2Br(-)) and NaPA, it could be found that the interaction between gemini surfactant (12-6-12 center dot 2Br(-)) and NaPA was stronger than that between DTMAB and NaPA. It could be also found that the salt and alcohol are favorable to the formation of the micelle-like aggregate and the re-dissolvation of the complex.