Physicochemical investigation of the solubilization of ytterbium nitrate in AOT reverse micelles and liquid crystals |
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| Authors: | L Ceraulo F Filizzola A Longo A Ruggirello V Turco Liveri |
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| Institution: | (1) Dipartimento di Chimica e Tecnologie Farmaceutiche, Università di Palermo, Via Archirafi 32, 90123 Palermo, Italy;(2) ISMN, Istituto per lo Studio dei Materiali Nanostrutturati CNR, Via U. La Malfa 156, 90146 Palermo, Italy;(3) Dipartimento di Chimica Fisica, Università di Palermo, Viale delle Scienze Parco D’Orleans II, 90128 Palermo, Italy |
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| Abstract: | A wide investigation of the solubilization of the water-soluble salt Yb(NO3)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(NO3)3, the Yb(NO3)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 CCl4, allowing the solubilization of a noticeable amount of Yb(NO3)3 in quite dry apolar media. By UV–vis–NIR, FT-IR, and 1H NMR spectroscopies, some information on the state of Yb(NO3)3 within AOT reverse micelles were acquired, whereas by small angle X-ray scattering (SAXS), it has been ascertained that Yb(NO3)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(NO3)3/AOT composites leads to the hypothesis that, also in these systems, Yb(NO3)3 is dispersed in the surfactant matrix as very small clusters. |
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| Keywords: | Solubilization Confinement effects Ytterbium nitrate AOT reverse micelles Ionic clusters |
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