Unusual aqueous-phase behavior of cationic amphiphiles with hydrogen-bonding headgroups

Langmuir : the ACS Journal of Surfaces and Colloids
Syed A A RizviFredric M Menger

Abstract

Two cationic surfactants with hydroxyl and carbamate hydrogen-bonding sites at their headgroups were synthesized. Both surfactants are ionic liquids (one of them at room temperature). Samples are isotropic solutions over the entire 0-100% concentration range, which is highly unusual for ionic surfactants. Surface tension, NMR, and conductivity measurements indicate classical micelle formation in aqueous solutions with CMCs below 10 mM. Pulse-gradient spin-echo (PGSE) NMR confirms micelle formation and provides micellar hydrodynamic radii of about 3.8 nm. Because this value is larger than the length of the extended surfactant molecules, about 2.7 nm, it appears that hydrogen-bonded water of hydration contributes substantially to the effective micelle size. At higher concentrations (above 25 wt %), surfactant solutions become viscous, but line broadening in the NMR is small relative to that found with a conventional cationic surfactant (CTAB). Thus, long rod formation, the source of line broadening in the latter, is absent with the new surfactants. Finally, PGSE NMR data show a 5-fold decrease in the diffusion coefficient between 5 and 20 wt %, above which the diffusion coefficients remain constant. The results are best explained...Continue Reading

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Citations

Aug 4, 2011·Chemical Society Reviews·Mohammad TariqLuís Paulo N Rebelo
May 7, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Yingqiu GuLiqiang Zheng
Oct 30, 2010·The Journal of Physical Chemistry. B·Defeng YuYilin Wang

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