Zero spontaneous curvature and its effects on lamellar phase morphology and vesicle size distributions

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

Abstract

Equimolar mixtures of dodecyltrimethylammonium chloride (DTAC) and sodium octyl sulfonate (SOSo) show a vesicle phase at >99 wt % water and a single, fluid lamellar phase for water fractions below 80 wt %. This combination is consistent with the bilayer bending elasticity kappa approximately k(B)T and zero bilayer spontaneous curvature. Caillé line shape analysis of the small-angle X-ray scattering from the lamellar phase shows that the effective kappa depends on the lamellar d spacing consistent with a logarithmic renormalization of kappa, with kappa(o) = (0.8 +/- 0.1)k(B)T. The vesicle size distribution determined by cryogenic transmission electron microscopy is well fit by models with zero spontaneous curvature to give (kappa + (kappa/2)) = (1.7 +/- 0.1)k(B)T, resulting in kappa = (1.8 +/- 0.2)k(B)T. The positive value of kappa and the lack of spontaneous curvature act to eliminate the spherulite defects found in the lamellar gel phases found in other catanionic mixtures. Current theories of spontaneous bilayer curvature require an excess of one or more components on opposite sides of the bilayer; the absence of such an excess at equimolar surfactant ratios explains the zero spontaneous curvature.

References

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Citations

Jan 19, 2011·Physical Chemistry Chemical Physics : PCCP·Youhei KawabataTadashi Kato
Dec 13, 2012·The Journal of Physical Chemistry. B·Wenlong XuJingcheng Hao
Jun 28, 2011·Journal of Liposome Research·Philippe GentineBenoît Frisch
May 24, 2011·Current Opinion in Colloid & Interface Science·Joseph A ZasadzinskiGuohui Wu
Feb 19, 2008·Journal of Colloid and Interface Science·R EfratN Garti
Dec 23, 2009·Biochimica Et Biophysica Acta·Joseph A ZasadzinskiPrajna Dhar
May 15, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Eva MaurerDavid Carrière
Dec 15, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Sylvain PrévostMichael Gradzielski

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