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Cation Effect on the Binary and Ternary Phase Behaviors of Double‐Tailed Methanesulfonate Amphiphiles
Author(s) -
Ontiveros Jesús F.,
Hong Bing,
Aramaki Kenji,
Pierlot Christel,
Aubry JeanMarie,
NardelloRataj Véronique
Publication year - 2021
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.12491
Subject(s) - chemistry , pulmonary surfactant , microemulsion , solubility , ternary numeral system , phase (matter) , micelle , ternary operation , sulfonate , emulsion , inorganic chemistry , analytical chemistry (journal) , aqueous solution , chromatography , organic chemistry , sodium , biochemistry , computer science , programming language
A series of symmetrical dialkyl methanesulfonate amphiphiles [DiC n CHSO 3 ] m M ( n  = 6, 7, 8) with different counter cations (M m+  = H + , Li + , Na + , K + , Cu 2+ , Zn 2+ , Mg 2+ , Ca 2+ , Sc 3+ ) were synthesized in five steps. Their solubility and critical micelle concentration (CMC) in water were determined highlighting a huge effect of the chain length and the nature of the cation. The hydrophilic–lipophilic balance of the surfactants were assessed with the phase inversion temperature (PIT)‐slope method based on the deviation from the PIT of the reference C 10 E 4 / n ‐octane/0.01 M NaCl (aq) emulsion through addition of increasing amounts of the dialkyl methanesulfonates. The hydrophilicity of the surfactants was thus ranked in terms of dPIT/dx sulfonate . A “cation” scan with the [DiC 6 CHSO 3 ] m M /benzene/water systems at f w  = 0.5 was finally performed confirming the hydrophilicity ranking obtained with the PIT‐slope method. It revealed that the [DiC 6 CHSO 3 ] 2 Mg behaves as a “Balanced Surfactant” able to form spontaneously a three‐phase microemulsion system (Winsor III) just in the presence of water and oil, in the same way as the catalytic surfactant dimethyldioctylammonium molybdate, which has the same PIT‐slope.

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