SURFACTANT FILM BENDING ELASTICITY IN MICROEMULSIONS - STRUCTURE AND DROPLET POLYDISPERSITY

被引:52
作者
SICOLI, F
LANGEVIN, D
LEE, LT
机构
[1] UNIV PARIS 07,ENS,PHYS STAT LAB,CNRS,F-75231 PARIS 05,FRANCE
[2] CENS,CEA,LAB LEON BRILLOUIN,CNRS,COMMUN LAB,F-91191 GIF SUR YVETTE,FRANCE
关键词
D O I
10.1063/1.466024
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The surfactant film bending elasticity can be described by a spontaneous curvature C0 and two elastic constants K and KBAR associated with the mean curvature and the Gaussian curvature, respectively. These parameters are very important in the determination of the structure of the dispersions stabilized by the surfactant (droplets or sponge-like structures). We have studied ternary mixtures of oil, water, and nonionic surfactants of different chain lengths. Depending on the temperature, the microemulsions are in equilibrium with excess oil (o/w structure), excess water (w/o), or both excess oil and water (bicontinuous). We present neutron scattering data from which we determine the microemulsion structure and, in the case of droplet structures, of the droplet polydispersity. These results, in combination with those from earlier experiments using ellipsometry, are used to estimate KBAR.
引用
收藏
页码:4759 / 4765
页数:7
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