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Thermally insulating and multifunctional glass fiber-silica aerogel composites via in situ growth
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A
J
DOI：10.1039/D6CP01741J.png)
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Abstract
En 中文
Silica aerogels are attractive thermal insulators because of their ultralow thermal conductivity. Nonetheless; their practical deployment is often limited by intrinsic brittleness and poor mechanical robustness. A weavable glass-fiber-reinforced silica aerogel composite is demonstrated; fabricated via in situ sol-gel growth on chemically modified fibers. Unlike traditional impregnation methods; silica nucleates and forms directly on the surface of the modified fiber to form an integrated network of fibers and aerogels with continuous interfacial connectivity. The covalent Si-O-Si linkages as well as hydrogen bonding between silica network and surface functional groups of the fibers stabilize the interface. The resulting composite exhibits an ultralow thermal conductivity of 0.0150 W • m -1 • K -1 together with high tensile strength; while preserving the intrinsic flexibility and weavability of the fiber scaffold. The material remains stable under direct flame exposure up to ~1000 °C; exhibiting only 1.3% mass loss after cyclic testing. In addition; hydrophobic modification imparts long-term water repellency; yielding a static water contact angle of 150°. This study establishes an interfacial engineering strategy for stabilizing aerogels within flexible and mechanically robust composites; providing a viable pathway toward aerogel-based thermal insulation in demanding environments.
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