Motamedi, Sina, Rousse, Daniel R. et Promis, Geoffrey.
2025.
« Microstructure-driven hygrothermal behavior of mycelium-based composites for bio-based insulation ».
Energies, vol. 18, nº 11.
Prévisualisation |
PDF
Rousse-D-2025-31052.pdf - Version publiée Licence d'utilisation : Creative Commons CC BY. Télécharger (5MB) | Prévisualisation |
Résumé
This study investigates the coupled hygrothermal behavior of mycelium-based composites (MBCs) as a function of their microstructural organization, governed by fungal species, substrate type, additive incorporation, and treatment method. Eleven composite formulations were selected and characterized using a multi-scale experimental approach, combining scanning electron microscopy, dynamic vapor sorption, vapor permeability tests, capillary uptake measurements, and transient thermal conductivity analysis. SEM analysis revealed that Ganoderma lucidum forms dense and interconnected hyphal networks, whereas Trametes versicolor generates looser, localized structures. These morphological differences directly influence water vapor transport and heat conduction. Additive-enriched composites exhibited up to 21.8% higher moisture uptake at 90% RH, while straw-based composites demonstrated higher capillary uptake and free water saturation (up to 704 kg/m3), indicating enhanced moisture sensitivity. In contrast, hemp-based formulations with Ganoderma lucidum showed reduced sorption and vapor permeability due to limited pore interconnectivity. Thermal conductivity varied nonlinearly with temperature and moisture content. Fitting the experimental data with an exponential model revealed a moisture sensitivity coefficient thirty times lower for GHOP compared to VHOP, highlighting the stabilizing effect of a compact microstructure. The distinction between total and effective porosity emerged as a key factor in explaining discrepancies between apparent and functional moisture behavior. These findings demonstrate that hygric and thermal properties in MBCs are governed not by porosity alone, but by the geometry and connectivity of the internal fungal network. Optimizing these structural features enables fine control overheat and mass transfer, laying the groundwork for the development of high-performance, bio-based insulation materials.
| Type de document: | Article publié dans une revue, révisé par les pairs |
|---|---|
| Professeur: | Professeur Rousse, Daniel R. |
| Affiliation: | Génie mécanique |
| Date de dépôt: | 30 juin 2025 20:29 |
| Dernière modification: | 08 août 2025 20:33 |
| URI: | https://espace2.etsmtl.ca/id/eprint/31052 |
Actions (Authentification requise)
 |
Dernière vérification avant le dépôt |