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Synergistic Interaction and Aggregation Behavior in a Mixture of a Tripolar Zwitterionic Surfactant and an Anionic Surfactant
Author(s) -
Luo Siqi,
Wang Yingxiong,
Wang Meina,
Wang Yilin
Publication year - 2018
Publication title -
journal of surfactants and detergents
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.349
H-Index - 48
eISSN - 1558-9293
pISSN - 1097-3958
DOI - 10.1002/jsde.12181
Subject(s) - chemistry , pulmonary surfactant , micelle , sodium dodecyl sulfate , aqueous solution , methylene , aggregation number , surface tension , mole fraction , sulfonate , cationic polymerization , critical micelle concentration , dynamic light scattering , inorganic chemistry , chemical engineering , chromatography , organic chemistry , sodium , thermodynamics , nanoparticle , biochemistry , physics , engineering
The aggregation behavior of a tripolar zwitterionic surfactant (C 14 C 6 Tri) with sodium dodecyl sulfate (SDS) in aqueous solution at various molar fractions was investigated using surface tension, turbidity, dynamic light scattering, ζ potential, and cryogenic transmission electron microscopy. The C 14 C 6 Tri carries 2 cationic ammonium headgroups and 1 anionic sulfonate headgroup, and the 2 ammonium headgroups are linked by a 6‐methylene chain while the sulfonate group is connected with one of the ammonium headgroups by a 3‐methylene chain. The surface activity parameters, the composition of mixed micelles, and the interaction parameter ( β ) were evaluated using an ideal mixing model and the regular solution model. The strong synergistic effect between C 14 C 6 Tri and SDS leads to a striking reduction in the critical micellar concentration and surface tension values. Both the interaction parameters at the air–water interface ( β σ ) and in the mixed micelles ( β m ) are large negative values. Moreover, the aggregate structures of the C 14 C 6 Tri/SDS mixture can be regulated by changing the molar fraction and the concentration. Upon increasing the molar fraction of SDS, the aggregate transitions take place from spherical micelles to vesicles, rod‐like micelles, and spherical micelles at a total surfactant concentration of 2.00 mM, while only small spherical micelles exist as the total surfactant concentration increases to 20.00 mM. The large headgroup, multi‐binding sites and variable conformation of C 14 C 6 Tri are responsible for the abundant aggregation behaviors.