AI Article Synopsis
- Cellulose aerogels are a cost-effective and sustainable alternative to silica aerogels, with improved mechanical properties.
- The study shows that cellulose aerogels exhibit a U-shaped relationship between thermal conductivity and density, finding a minimum thermal conductivity at a specific density.
- Compression impacts thermal conductivity, lowering it by approximately 5 mW·m·K due to the alignment of cellulose nanofibers, as demonstrated by small angle X-ray scattering.
Article Abstract
Cellulose aerogels are potential alternatives to silica aerogels with advantages in cost, sustainability and mechanical properties. However, the density dependence of thermal conductivity (λ) for cellulose aerogels remains controversial. Cellulose aerogels were produced by gas-phase pH induced gelation of TEMPO-oxidized cellulose nanofibers (CNF) and supercritical drying. Their properties are evaluated by varying the CNF concentration (5-33 mg·cm) and by uniaxial compression (9-115 mg·cm). The aerogels are transparent with specific surface areas of ~400 m·g, mesopore volumes of ~2 cm·g and a power-law dependence of the E-modulus (α ~ 1.53, and the highest reported E of ~1 MPa). The dataset confirms that λ displays a traditional U-shaped density dependence with a minimum of 18 mW·m·K at 0.065 g·cm. For a given density, λ is ~5 mW·m·K lower for compressed aerogels due to the alignment of nanofibers, confirmed by small angle X-ray scattering (SAXS).
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| http://dx.doi.org/10.1016/j.carbpol.2022.119675 | DOI Listing |
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