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Poster De Conférence Année : 2021

Controlling the rheology of a solid emulsion with liquid droplets

Résumé

Emulsions are interesting systems that show dependencies on the rheological properties of the continuous and dispersed phases and their interface. By solidifying the continuous phase and keeping the dispersed phase liquid we can create a composite viscoelastic material that can be tuned by changing the viscosity of the dispersed phase, the elasticity of the continuous phase and/or the surface properties, in particular the surface tension between the two phases, which changes the capillary stresses within the emulsion. Here we study such a “solid emulsion” with a crosslinked PDMS (poly(dimethyl) siloxane) continuous phase. The dispersed phase is at first pure PEG (poly(ethylene) glycol), or PEO (poly(ethylene) oxide) solutions in PEG in order to vary the viscosity of the liquid phase while keeping it in a Newtonian regime. Previous theoretical work has shown that we can expect to see different rheological responses depending on the dispersed phase viscosity, the size of the droplets in the solid matrix and the volume fraction of liquid. [1] The aim of this work is to show the feasibility of a composite system whose storage and loss moduli can be controlled independently, as opposed to the commonly used viscoelastic materials such as adhesives and gels. [1] Palierne, (1990). Rheologica Acta, 29(3), 204-214
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Dates et versions

hal-03781867 , version 1 (20-09-2022)

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  • HAL Id : hal-03781867 , version 1

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E Gilbert, A Salonen, C Poulard. Controlling the rheology of a solid emulsion with liquid droplets. Annual European Rheology Conference 2021, Apr 2021, Online, France. ⟨hal-03781867⟩
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