Communication Dans Un Congrès Année : 2025

Non-aging and thermal superinsulating bio-based composite aerogels

Résumé

Aerogels are solid materials with nanometer-scale pores showing interesting properties (e.g., nanostructured network, high porosity, low density, and high specific surface area) for a range of applications. The field of aerogels based on natural resources, such as polysaccharides, is gaining more and more attention due to the need for sustainable alternatives to conventional, non-renewable counterparts. Among bio-based aerogels, pectin aerogels possess a density of around 0.1 g/cm 3 and a very fine network with meso-and small macropores. Thanks to these properties, pectin aerogels are perfect candidates for thermal insulation applications since they exhibit extremely low thermal conductivity at room conditions (0.015 -0.020 W m -1 K -1 ). As a drawback, pectin aerogels are highly hygroscopic: they adsorb moisture from the air leading to network collapse and loss of the initial properties (so called "aging").

In this work, "composite" approach was applied to prevent material aging. Hydrophobization of pectin aerogels was achieved via deposition of polyurea on pectin fibrils. The influence of synthesis parameters on the material properties was investigated. Density and thermal conductivity were monitored over time at high relative humidity. Polyurea homogeneously coated the skeletal network of pectin aerogel, resulting in materials with high water contact angles and very low thermal conductivity (down to 0.015 W m -1 K -1 ) at ambient conditions. The pectin/polyurea composite aerogels exhibited stable thermal conductivity (0.015 W m -1 K -1 ), during more than 10 months at 25°C and 80% relative humidity.

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Dates et versions

hal-05428062 , version 1 (21-12-2025)

Identifiants

  • HAL Id : hal-05428062 , version 1

Citer

Eleni Effraimopoulou, Patrina Paraskevopoulou, Julien Jaxel, Tatiana Budtova, Arnaud Rigacci. Non-aging and thermal superinsulating bio-based composite aerogels. American Chemical Society Spring 2025, Mar 2025, San Diego (CA), United States. ⟨hal-05428062⟩
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