Lamellar gels and spontaneous vesicles in catanionic surfactant mixtures

Langmuir : the ACS Journal of Surfaces and Colloids
B ColdrenEric B Sirota

Abstract

Caillé analysis of the small-angle X-ray line shape of the lamellar phase of 7:3 wt/wt cetyltrimethylammonium tosylate (CTAT)/sodium dodecylbenzene sulfonate (SDBS) bilayers shows that the bending elastic constant is kappa = (0.62 +/- 0.09)k(B)T. From this and previous results, the Gaussian curvature constant is kappa = (-0.9 +/- 0.2)k(B)T. For 13:7 wt/wt CTAT/SDBS bilayers, the measured bending elasticity decreases with increasing water dilution, in good agreement with predictions based on renormalization theory, giving kappa(o) = 0.28k(B)T. These results show that surfactant mixing is sufficient to make kappa approximately k(B)T, which promotes strong, Helfrich-type repulsion between bilayers that can dominate the van der Waals attraction. These are necessary conditions for spontaneous vesicles to be equilibrium structures. The measurements of the bending elasticity are confirmed by the transition of the lamellar phase of CTAT/SDBS from a turbid, viscoelastic gel to a translucent fluid as the water fraction is decreased below 40 wt %. Freeze-fracture electron microscopy shows that the gel is characterized by spherulite defects made possible by spontaneous bilayer curvature and low bending elasticity. This lamellar gel phase i...Continue Reading

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Citations

Jun 8, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Jeff PenfoldI Grillo
Dec 7, 2007·Chemical Communications : Chem Comm·Jin-Lan ZhouYan-Song Zheng
Jun 23, 2011·Physical Chemistry Chemical Physics : PCCP·Yun YanJianbin Huang
May 5, 2009·The European Physical Journal. E, Soft Matter·Y AuffretC Rochas
May 2, 2009·Journal of Colloid and Interface Science·Kulbir SinghRobert D Singer
Sep 17, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Lu XuJian R Lu
Dec 9, 2014·Physical Chemistry Chemical Physics : PCCP·Keigo MatsumotoKeiji Tanaka
Feb 1, 2008·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Yutaka SuminoKenichi Yoshikawa
Aug 3, 2017·Gels·Paula Malo de Molina, Michael Gradzielski
Dec 15, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Sylvain PrévostMichael Gradzielski
Oct 13, 2006·The Journal of Physical Chemistry. B·Christopher L KitchensChristopher B Roberts

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