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Étude de l'inversion de phase catastrophique lors de l'émulsification de produits visqueux

Abstract : This study deals with the description and understanding of catastrophic phase inversion during high viscous oil emulsification, through the analysis of the effects of formulation and process variables on the dispersed phase fraction at which the inversion is triggered and on the involved mechanisms. The simultaneous follow up in situ of viscosity and conductivity measurements allowed, from a process point of view, to emphasize on the effect that the aqueous phase addition rate has on the formation of multiple w/O/W emulsions. Due to the formation of w/o/W emulsions, the volume of the effective dispersed phase greatly increases while at the same time, if the aqueous phase is added by very small fractions inversion of the w/o/W system can occur. In relation with formulation, an increase in oil viscosity greatly increased the tendency of the oily phase to become the dispersed phase. At the same time, it promoted the formation of highly concentrated emulsions (about 80 to 95 % in volume) after the inversion had occurred. The microscopical follow-up of emulsion morphology by means of squeezing flow, allowed us to establish the conditions and mechanisms that lead to partial or complete inversion. Even though literature sources lead us believe that inversion will occur through the inclusion/escape mechanism, experimental results showed that the relative viscosity between the phases promoted inversion through the mechanism of agglomeration coalescence rather than inclusion/escape. A mathematical model based on population balances and on the fractal nature of multiple emulsions allowed us to describe the multiples drop size and effective dispersed phase evolution until inversion phenomena
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Johanna Maria Galindo Alvarez. Étude de l'inversion de phase catastrophique lors de l'émulsification de produits visqueux. Autre. Institut National Polytechnique de Lorraine, 2008. Français. ⟨NNT : 2008INPL015N⟩. ⟨tel-01752988⟩



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