Opacified graphene-doped silica aerogels with controllable thermal conductivity |
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| Authors: | Jiayi Zhu Hongbo Ren Yutie Bi |
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| Affiliation: | 1.Functional Structure Material Laboratory,Southwest University of Science and Technology,Mianyang,People’s Republic of China;2.Joint Laboratory for Extreme Conditions Matter Properties,Southwest University of Science and Technology and Research Center of Laser Fusion,Mianyang,People’s Republic of China |
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| Abstract: | 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. |
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