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- W2047147788 abstract "The surface activity of salts added to water is orders of magnitude lower than that of surfactants. Sodium trifluoromethanesulfonate (NaTf) produced a change in surface tension with concentration, Δγ/Δc, of −13.2 mN·L/m·mol. This value is ca. 4-fold larger than those of simple salts and that of methanesulfonate. This unexpected surface effect suggested that positively charged micelles containing Tf could exhibit interesting properties. Dodecyltrimethylammonium triflate (DTATf) had a higher Kraft temperature (37 °C) and a lower cmc (5 × 10−3 M) and degree of dissociation (0.11) than the chloride and bromide salts of DTA. Above the Kraft temperature, at a characteristic temperature t1, the addition of NaTf above 0.05 M to a DTATf solution induced phase separation. By increasing the temperature of the two-phase system to above t1, a homogeneous, transparent solution was obtained at a characteristic temperature t2. These results, together with well-known triflate properties, led us to suggest that the Tf ion pairs with DTA and that the −CF3 group may be dehydrated in the interfacial region, resulting in new and interesting self-aggregated structures." @default.
- W2047147788 created "2016-06-24" @default.
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- W2047147788 date "2011-03-17" @default.
- W2047147788 modified "2023-10-15" @default.
- W2047147788 title "Surface Activity of the Triflate Ion at the Air/Water Interface and Properties of <i>N</i>,<i>N</i>,<i>N</i>-Trimethyl-<i>N</i>-Dodecylammonium Triflate Aqueous Solutions" @default.
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- W2047147788 doi "https://doi.org/10.1021/la2004613" @default.
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