Journal
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
Volume 18, Issue 2, Pages 95-99Publisher
EDITIONS SANTE
DOI: 10.1016/S1773-2247(08)50015-3
Keywords
emulsion phase inversion; electrical conductivity; conductivity peak; non-ionic surfactant; liquid crystals; myelin figures
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This paper presents a study of the phenomenon of emulsion phase inversion through a thorough follow-up of emulsion and microemulsion electrical conductivity. A model nonionic surfactant, C18E6, was used in order to study a general case and emphasize the general aspect of this work. This study mainly discloses the experimental origins of the peak-shaped conductivity irregularity within the emulsion inversion. This phenomenon is then shown to be linked to the formation of myelin-like liquid crystals, observed at equilibrium between slide and coverslip, by temperature-monitored polarizing microscopy. The potential links between these new results and the phase inversion temperature method for generating nano-emulsions were also tackled. Finally, this paper provides an original approach, new insights into the phenomena arising when emulsions undergo a phase inversion, in terms of electrical conductivity, liquid crystal formation, phase diagrams, and nonionic surfactant behavior.
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