Determination of the Water/AOT/Isooctane Reverse Micelles Size Parameters from Their Refractive Index Data |
| |
Authors: | Ahmed El Aferni Moez Guettari Tahar Tajouri |
| |
Institution: | 1.Preparatory Institute for Engineering Studies of Tunis, NMR in Polymers and Composites Laboratory,University of Tunis,Tunis,Tunisia;2.Faculty of Sciences of Bizerte,University of Carthage,Bizerte,Tunisia |
| |
Abstract: | The present paper aims to study the proprieties of water confined in water/AOT/isooctane reverse micelles from their refractive indices at 298.5 K. The refractive indices of the microemulsions were investigated at increasing water concentration and at different micellar volume fractions, Φ d. The refractive index of micellar water was deduced for a large water to AOT molar ratio, W 0. The refractive index of interfacial water was also calculated. Then, the molar faction of interfacial water, α, was deduced for different W 0 values and compared with those measured by NMR as reported in the literature. The results show qualitative agreement. Finally, the average aggregation number, n agg, the area per surfactant headgroup, σ, as well as the interfacial thickness, d i, of the reverse micelles were determined for the W 0 values studied. The values of these structural parameters also show good qualitative agreement with NMR and small angle X-ray scattering data reported in the literature. Thus, the refractive index method can be a cheap and fast alternative for these two methods. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|