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Émulsions inverses très concentrées : formulation, comportement rhéologique et modélisation

Abstract : This thesis deals with the study of the influence of formulation on the rheological behavior of highly concentrated reverse emulsions. We used an original approach consisting in representing the elastic modulus (G) of these emulsions on a formulation-composition bidimensional map to study, in particular, the effect of the so-called optimum formulation. Two major effects are observed in relation to this one: emulsions prepared at HLB=10, i.e. at the proximity of optimum value (HLB=10.5) present values of G remarkably lower than those at other formulations, while at a certain distance (HLB=7.7) the values of G are higher in comparison to others formulations. This last particular HLB matches with the occurrence of a maximum stability and a minimum drop size of dispersion. Highly concentrated emulsions being generally opaque and fragile, the analysis of incoherent polarized steady light transport, that does not imply any dilution, has been used as an alternative method to classical techniques to determine the average film thickness (h). The average drop size (R) has then to be determined from a geometrical model linking it to the average film thickness (h), to the dispersed phase volume fraction (f) and to a geometrical factor (f9) that takes into account the polyhedral shape of the drops. Hence, a modified expression of the model proposed by Mougel et al. (2006) has been established to model the elastic modulus (G) by relating it to the average drop size (R), the interfacial tension (s) and the dispersed phase volume fraction (f)
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Emilio Alberto Paruta Tuarez. Émulsions inverses très concentrées : formulation, comportement rhéologique et modélisation. Autre. Institut National Polytechnique de Lorraine, 2010. Français. ⟨NNT : 2010INPL008N⟩. ⟨tel-01748794⟩



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