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Salting-out effect induced by temperature cycling on a water/nonionic surfactant/oil system.

Abstract : This paper presents original effects induced by temperature cycling on the transitional phase inversion of emulsions, stabilized by a nonionic polyethoxylated C18E6 surfactant model. The phase inversion follow-up is performed by electrical conductivity measurements, which involves focusing the study on the shape and location of the emulsion inversion region. In that way, new observations are brought out as a gradual evolution of the emulsion inversion along the cycling process. Two alternative approaches are considered for tackling these results: (i) first, a molecular approach regarding the particular organization and rearrangement of water clusters surrounding the surfactant polymer polar head, and (ii) second, a thermodynamic approach only considering the whole Gibbs free energy of the system. The volumic approaches are transposed, here, to the water/oil interface, and disclose that the phase inversion zone is included in a metastable region, able to stabilize for a given temperature, either metastable O/W emulsions or stable W/O ones. In that way, this study proposes novel and complementary insights into the phenomena governing the emulsion phase inversion.
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Submitted on : Thursday, February 21, 2008 - 11:31:45 AM
Last modification on : Wednesday, October 14, 2020 - 4:10:19 AM

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Nicolas Anton, Patrick Saulnier, Arnaud Béduneau, Jean-Pierre Benoit. Salting-out effect induced by temperature cycling on a water/nonionic surfactant/oil system.. Journal of Physical Chemistry B, American Chemical Society, 2007, 111 (14), pp.3651-7. ⟨10.1021/jp0664768⟩. ⟨inserm-00258162⟩



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