Communication Dans Un Congrès Année : 2024

Stiffen and dissipate with liquid inclusions in a solid matrix

Résumé

Solid emulsions are composite materials made of liquid droplets encapsulated in a solid continuous phase. Their structure which is similar to liquid emulsions and solid dispersions allow for a large array of control parameters, including the rheological response of the continuous or the dispersed phase, or even the structure of the emulsion. These singular systems are ideal candidates to generate materials with a fine-tuned rheological response, both in their elastic response and their viscous dissipation. We generate solid emulsions of poly(ethylene glycol) (PEG) in poly(dimethyl siloxane) (PDMS), and characterize their oscillatory rheology. The generation method, which influences the droplet size, and the stiffness of the continuous phase, show the non-trivial influence of the elastocapillary number which compares the influence of the elastic response of the matrix and of the capillary pressure within the droplets over the rheology of the composite. We focus on a series of samples for which the competition between the interfacial tension and the elastic response of the continuous phase leads to different evolution of the storage and the loss modulus when the liquid volume fraction in the emulsion increases.

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Dates et versions

hal-04696916 , version 1 (13-09-2024)

Identifiants

  • HAL Id : hal-04696916 , version 1

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Elina Gilbert, Anniina Salonen, Christophe Poulard. Stiffen and dissipate with liquid inclusions in a solid matrix. Journées des Jeunes Rhéologues, Groupement Français de Rhéologie, Jun 2024, Peyresq, France. ⟨hal-04696916⟩
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