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ESR Studies on the Micellization Behaviors of a Series of Novel Asymmetric Gemini Surfactants
Author(s) -
Wu YiTihan,
Wang JinBen,
Liu MingHua,
Liang WenPing
Publication year - 2002
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.20020200606
Subject(s) - chemistry , pulmonary surfactant , surface tension , cationic polymerization , critical micelle concentration , micelle , electron paramagnetic resonance , thermodynamics of micellization , homologous series , alkyl , spin probe , organic chemistry , thermodynamics , aqueous solution , nuclear magnetic resonance , membrane , biochemistry , physics
The synthesis of a new series of asymmetric cationic gemini surfactant and the investigation of their micellization behaviors by electronic spin resonance (ESR) as well as the surface tension measurements were reported. 4‐Oxo‐2,2,6,6‐tetramethylpiperidine‐ N ‐oxyl (4‐oxo‐TEMPO) is used as the spin probe. The surfactants studied have the general formula [C n H 2 n +1 N + (CH 3 ) 2 C 6 H 12 N + (CH 3 ) 2 C m H 2 m +1 ]Br 2 − , referred to as dimeric n ‐6‐ m surfactants, in which n and m are the numbers of carbon atoms in the asymmetric side alkyl chains. From the experimental data, rotational correlation time τ c , surface tension and critical micelle concentration (cmc) values, the physical properties of these new surfactants have preliminarily been e‐valuated. It is shown that this new series of asymmetric gemini surfactants has interesting micellization behaviors, and they are very different in aggregating tendency from their asymmetric analogues.