Opacified graphene-doped silica aerogels with controllable thermal conductivity
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In this work, we developed a new type of thermal insulation materials by combining the silica aerogel (SiO2) and graphene (G) followed by aging and supercritical drying. The effects of different G/SiO2 mass ratios on the microstructures and properties of opacified G/SiO2-x composite aerogels were investigated. The results showed that the graphene was well-distributed in the SiO2 matrix. Meanwhile, the opacified composite aerogels showed high-specific surface area (~ 1000 m2/g). Due to the unique bandgap feature and conjugated large π bond of graphene, the thermal insulation property of G/SiO2-x composite aerogels was enhanced in contrast with the pure SiO2 aerogel. Moreover, a possible mechanism of heat transfer was discussed to interpret the result.
KeywordsSilica aerogel Graphene Composite aerogel Thermal conductivity Thermal insulation
This study was funded by the National Natural Science Foundation of China (Grant No. 51502274) and the Doctoral Research Fund of Southwest University of Science and Technology (Nos. 15zx7137, 16zx7142).
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Conflict of interest
The authors declare that they have no conflict interest.
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