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Article Dans Une Revue Journal of Colloid and Interface Science Année : 2021

Evaluation of the repartition of the particles in Pickering emulsions in relation with their rheological properties

Résumé

HypothesisThe distribution of particles in Pickering emulsions can be estimated through a percolation-type approach coupled to the evolution of their rheological features with the dispersed phase volume fraction ϕ.ExperimentsThe rheological behavior of water-in-dodecane Pickering emulsions stabilized with hydrophobic silica nanoparticles is addressed. The emulsions viscosity and elastic modulus are investigated at ϕ varying from 0.1 to 0.75. Various rheological models are adjusted to the experimental data.FindingsThe comparison of the elastic modulus evolution of the Pickering emulsions with those of emulsions stabilized with surfactants confirms a major contribution of the particles to the rheological behavior of Pickering emulsions and supports the existence of a three-dimensional network between the droplets. The applied percolation approach allows to quantitively estimate a nanoparticles viscoelastic link between the droplets and opposes the classic vision of interfacial monolayers stabilizing the Pickering emulsions. This network of interconnected particles and droplets contributes significantly to the viscosity as well as the elastic modulus of these emulsions. To our knowledge, the applied percolation-based model is the only one capable of providing a structural explanation while describing the abrupt viscosity and elastic modulus growth of Pickering emulsions across the range of ϕ

Domaines

Génie chimique
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Dates et versions

hal-03178451 , version 1 (03-02-2023)

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Paternité - Pas d'utilisation commerciale

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Santiago F. Velandia, Philippe Marchal, Cécile Lemaitre, Véronique Sadtler, Thibault Roques-Carmes. Evaluation of the repartition of the particles in Pickering emulsions in relation with their rheological properties. Journal of Colloid and Interface Science, 2021, 589, pp.286-297. ⟨10.1016/j.jcis.2021.01.005⟩. ⟨hal-03178451⟩
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