Determination of the Water/AOT/Isooctane Reverse Micelles Size Parameters from Their Refractive Index Data

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• 作者：Ahmed El Aferni ; Moez Guettari ; Tahar Tajouri
• 关键词：Refractive index ; Reverse micelles ; Confined water ; Size parameters
• 刊名：Journal of Solution Chemistry
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：46
• 期：1
• 页码：89-102
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Industrial Chemistry/Chemical Engineering; Geochemistry; Oceanography; Inorganic Chemistry; Condensed Matter Physics;
• 出版者：Springer US
• ISSN：1572-8927
• 卷排序：46

文摘

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, W₀. The refractive index of interfacial water was also calculated. Then, the molar faction of interfacial water, α, was deduced for different W₀ 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 W₀ 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.