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ABSTRACT
The micellar aggregation of a series of gemini surfactants [N, N’-dimethyl-N, N’-bis(2-alkylamideethyl)-ethylenediamine oxide (alkyl = C11H23, C13H27, C15H31)] in aqueous media has been investigated. The results show that there is an excellent agreement among the critical micelle concentration (CMC) values obtained by surface tension and steady-state fluorescence methods. Because of the occurrence of self-coiling or the formation of pre-micellization, the CMC values, the I1/I3 values, and the micelle aggregation numbers (Nagg) at CMC (Nm) increase with the hydrophobic alkyl chain length increasing. Besides, vesicles are observed above the CMC for all these surfactants.
GRAPHICAL ABSTRACT
Additional information
Funding
We gratefully acknowledge the financial support of the National Natural Science Foundation of China (21676003), Beijing Municipal Science and Technology Project (Z171100001317015), National Key R&D Program of China (2017YFB0308701), the transformation of scientific and technological achievements-promotion plan project (PXM2016_014213_000028), and the Science and Technology Program Key Project of Beijing Municipal Commission of Education (KZ201510011010).