Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 63, Issue 3, Pages 445-456Publisher
SPRINGER
DOI: 10.1007/s10971-012-2806-7
Keywords
Aerogel composite; Fiber alignment; Mechanical properties; Thermal insulation
Categories
Funding
- National Natural Science Foundation of China [50906014]
- Key Project of Ministry of Education, China [211130]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong, China [LYM09013]
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Flexible aerogel was successfully supported onto 4-layer-aligned glass fibers through impregnation, followed by drying at atmospheric pressure. The prepared nanocomposites can achieve a low thermal conductivity of 0.026 W/(m center dot K), which holds great promising for their use in thermal insulation applications. By choosing different designs of the four fiber layers, in the terms of LLLL, LTLL, LLTT, LTLT, LTTL and LTTT, the laminated structures of aerogel composites can be accordingly controlled. Further microstructure characterization of the composites revealed the homogeneous dispersion of nanoporous structure through the aerogel matrix, as well as highly-aligned fibers to reinforce the structure. Detailed investigation on the thermal and mechanical properties of the prepared fiber-aerogel composites showed that their performances were highly related to the laminated design of fiber layers. The introduction of fibers as the backbone of the aerogel and the suitable design of their laminated structure can greatly improve the mechanical properties of the aerogel composites while maintaining a low thermal conductivity.
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