Article Dans Une Revue Composites Part B: Engineering Année : 2025

Multiscale characterization of effective thermal properties of graphene/polymer composite aerogels

Résumé

This work involves the characterization of eective thermal conductivity of polymer aerogel reinforced by graphene and graphene oxide elaborated by replacing the liquid phase with a gas phase through an environmentally friendly freeze-drying process. For characterizing the developed aerogel, multiscale geometrical congurations were constructed based on the experimental characterizations of the prepared aerogels. Following that, a homogenization procedure was applied, moving from smaller to larger scales. At the nanoscale, the Milton method was used, while at the micro-and macroscales, the asymptotic method was employed in combination with the nite element method.

Problems posed on a domain called the representative unit cell were formulated at both microand macroscales, and their resolution using the nite element method allows the calculation of characteristic functions of the problems, thereby obtaining eective thermal conductivity of the material. To the best of our knowledge, no studies have been reported in the literature on the multiscale characterization of the eective properties of polymer aerogels, hence the motivation for this work. To address this gap, a novel numerical approach has been developed to investigate aerogel properties across multiple scales. The multiscale approaches have revealed the inuence of various microstructural characteristics on the eective thermal conductivity properties of the hybrid aerogel. The results show that graphene and graphene oxide nanoinclusions do not signicantly aect the thermal conductivity, but they do signicantly improve the mechanical properties of the polymer-based aerogel. Furthermore, this study has also demonstrated that aerogels with superinsulating properties can be obtained by reducing the pore size to the nanometer scale and lowering the gas pressure to below 0.01 atm.

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Dates et versions

hal-04887083 , version 1 (16-01-2025)

Identifiants

Citer

D.-T. Le, V.-H. Nguyen, S. Mahouche-Chergui, B. Carbonnier, Daniel Grande, et al.. Multiscale characterization of effective thermal properties of graphene/polymer composite aerogels. Composites Part B: Engineering, 2025, 293, pp.112106. ⟨10.1016/j.compositesb.2024.112106⟩. ⟨hal-04887083⟩
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