A series of highly concentrated lipophilic cosmetic emulsions were analysed, in order to determine their rheological and textural properties, as a function of their microstructure. The originality of this study lies in the methodology used, especially the shear-stress scanning analysis. The results of a very powerful and comprehensive dynamic rheological analysis suggest the existence of two critical volume fraction values: besides the "close-packed" value phi(c), a "slack-packed" value phi(0), close to 0.60 could be demonstrated. It has been shown that the close-packed structure is stable under shear; in constrast, the slack-packed configuration, defined as phi(0)

Keywords:IN-WATER EMULSIONS;VOLUME FRACTION;VISCOELASTIC PROPERTIES;SHEAR VISCOSITY;YIELD STRESS;FOAMS;DISPERSIONS;STABILITY;SYSTEMS

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