期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2002
卷号：99
期号：24
页码：15318-15322
DOI：10.1073/pnas.242374499
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：In mixtures of cetyltrimethylammonium bromide (CTAB) and sodium perfluorooctanoate (FC7) in aqueous solution, novel bilayer cylinders with hemispherical end caps and open, flat discs coexist with spherical unilamellar vesicles, apparently at equilibrium. Such equilibrium among bilayer cylinders, spheres, and discs is only possible for systems with a spontaneous curvature, Ro, and a positive Gaussian curvature modulus, [IMG]f1.gif" ALT="Formula" BORDER="0">. We have measured the size distributions of the spherical vesicles, cylinders, and discs by using cryo-electron microscopy; a simple analysis of this length distribution allows us to independently determine that the mean curvature modulus, {kappa} {approx} 5 {+/-} 1 kBT and [IMG]f1.gif" ALT="Formula" BORDER="0"> {approx} 2 {+/-} 1 kBT. This is one of the few situations in which Ro, {kappa
关键词：cryogenic transmission electron microscopy ; surfactants ; vesicles
