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The Nanostructure Studies of Surfactant-Free-Microemulsions in Fragrance Tinctures

Perica Boskovic, Vesna Sokol, Didier Touraud, Ante Prkić, Josipa Giljanović


As it was shown recently that nanostructures can exist in water-ethanol-citronellol  tinctures, a deeper investigation of these media was performed using conductivity, UV-Vis and FT-IR spectroscopy techniques. Different regimes of conductivity, depending on the water content, an increase of the polarity of the polar pseudo-phase with increasing water content, and even the presence of free water molecules at higher water content are observed, just as in classical surfactant-based microemulsions. The percolation model, generally used to fit conductivity data in surfactant based microemulsion having a weak interfacial film, can be used to fit our conductivity data below a critical water content with a critical exponent typical of dynamic percolation. In presence of higher water contents, superior to , our conductivity data cannot be fitted neither with a static nor a dynamic percolation model. As in surfactant-based microemulsions, an increase of polarity of the microenvironment with increasing water content can be postulated using respectively the UV-Vis wavelength absorption band (λmax) of methyl orange and performing FT-IR spectra.


Nanostructure; Citronellol; Microemulsions; UV-Vis spectroscopy; Conductivity; FT-IR spectroscopy

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Copyright (c) 2016 Perica Boskovic, Vesna Sokol, Didier Touraud, Ante Prkić, Josipa Giljanović

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