Physicochemical investigation of the solubilization of ytterbium nitrate in AOT reverse micelles and liquid crystals

A wide investigation of the solubilization of the water-soluble salt Yb(NO^sub 3^)^sub 3^ in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles and AOT liquid crystals has been carried out. After saturation of water/AOT/organic solvent w/o microemulsions with pure Yb(NO^sub 3^)^sub 3^, th...

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Bibliographic Details
Published in:Colloid and polymer science 2006-07, Vol.284 (10), p.1085-1095
Main Authors: CERAULO, L, FILIZZOLA, F, LONGO, A, RUGGIRELLO, A, TURCO LIVERI, V
Format: Article
Language:English
Subjects:
Chemistry
Clusters
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Liquid crystals
Micelles. Thin films
Microemulsions
Reverse micelles
SAXS
Sodium
Solubilization
Solvents
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Summary:A wide investigation of the solubilization of the water-soluble salt Yb(NO^sub 3^)^sub 3^ in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles and AOT liquid crystals has been carried out. After saturation of water/AOT/organic solvent w/o microemulsions with pure Yb(NO^sub 3^)^sub 3^, the Yb(NO^sub 3^)^sub 3^/AOT composites were prepared by complete evaporation under vacuum of the volatile components (water and organic solvent) of the salt-containing microemulsions. It was observed that these composites can be totally dissolved in pure n-heptane or CCl^sub 4^, allowing the solubilization of a noticeable amount of Yb(NO^sub 3^)^sub 3^ in quite dry apolar media. By UV-vis-NIR, FT-IR, and ^sup 1^H NMR spectroscopies, some information on the state of Yb(NO^sub 3^)^sub 3^ within AOT reverse micelles were acquired, whereas by small angle X-ray scattering (SAXS), it has been ascertained that Yb(NO^sub 3^)^sub 3^ is quite homogeneously distributed as very small clusters among the reverse micelles. An analysis of SAXS and wide-angle X-ray scattering spectra of Yb(NO^sub 3^)^sub 3^/AOT composites leads to the hypothesis that, also in these systems, Yb(NO^sub 3^)^sub 3^ is dispersed in the surfactant matrix as very small clusters.[PUBLICATION ABSTRACT]
ISSN:0303-402X
1435-1536
DOI:10.1007/s00396-006-1485-8