Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity
We describe lightweight three-dimensional (3D) graphene hybrid SiO<sub>2</sub> aerogels (GSAs) with hierarchically robust interconnected networks fabricated via an in situ deposition procedure after a hydrothermal assembling strategy with graphene oxide sheets. The nano-/micron-thick SiO...
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MDPI AG
2020-05-01
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| Online Access: | https://www.mdpi.com/2079-6412/10/5/455 |
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doaj-d63f7d82c6664db5be051e75c28a38742020-11-25T03:00:22ZengMDPI AGCoatings2079-64122020-05-011045545510.3390/coatings10050455Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High ElasticityLiwei Zhang0Peng He1Kunkun Song2Jingxiang Zhang3Baoqiang Zhang4Ruixian Huang5Qiangqiang Zhang6College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410000, ChinaCollege of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, ChinaCollege of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, ChinaCollege of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, ChinaCollege of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, ChinaCollege of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, ChinaCollege of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, ChinaWe describe lightweight three-dimensional (3D) graphene hybrid SiO<sub>2</sub> aerogels (GSAs) with hierarchically robust interconnected networks fabricated via an in situ deposition procedure after a hydrothermal assembling strategy with graphene oxide sheets. The nano-/micron-thick SiO<sub>2</sub> coating conformably grew over porous graphene templates with two constituents (e.g., graphene and SiO<sub>2</sub>) and formed chemically bonded interfaces. In addition, it significantly refined the primary graphene pores by hundreds of microns into smaller porous patterns. Studies of its mechanical properties verified that the graphene interframework made the ceramic composites elastic, while SiO<sub>2</sub> deposition enhanced the strength required it to resist deformation. The higher SiO<sub>2</sub> contents resulted in lower elasticity but larger strength because of the apparent nanosize effect of SiO<sub>2</sub> ceramic thickness; GSAs with a density of 82.3–250.3 mg/cm<sup>3</sup> (corresponding to SiO<sub>2</sub> sol with concentration ranging from 5 to 20 wt %) could reach a good balance of strength and elasticity. Benefiting from hierarchical micronetworks consisting of semiclosed or closed pores, GSAs offer excellent thermal-insulation performance, with thermal conductivity as low as 0.026 W/(m·K). GSAs offer improved fire-resistant capacity rather than that of pure carbon-based aerogels via the synergic protection of SiO<sub>2</sub> ceramic accretion. This highlights the promising applications of GSAs as lightweight thermal-shielding candidates for industrial equipment, civil architectures, and defense transportation vehicles.https://www.mdpi.com/2079-6412/10/5/455graphene hybrid SiO<sub>2</sub> aerogelsmechanical propertiesstrength and elasticitythermal insulationfire-resistant capacities. |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Liwei Zhang Peng He Kunkun Song Jingxiang Zhang Baoqiang Zhang Ruixian Huang Qiangqiang Zhang |
| spellingShingle |
Liwei Zhang Peng He Kunkun Song Jingxiang Zhang Baoqiang Zhang Ruixian Huang Qiangqiang Zhang Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity Coatings graphene hybrid SiO<sub>2</sub> aerogels mechanical properties strength and elasticity thermal insulation fire-resistant capacities. |
| author_facet |
Liwei Zhang Peng He Kunkun Song Jingxiang Zhang Baoqiang Zhang Ruixian Huang Qiangqiang Zhang |
| author_sort |
Liwei Zhang |
| title |
Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity |
| title_short |
Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity |
| title_full |
Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity |
| title_fullStr |
Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity |
| title_full_unstemmed |
Three-Dimensional Graphene Hybrid SiO<sub>2</sub> Hierarchical Dual-Network Aerogel with Low Thermal Conductivity and High Elasticity |
| title_sort |
three-dimensional graphene hybrid sio<sub>2</sub> hierarchical dual-network aerogel with low thermal conductivity and high elasticity |
| publisher |
MDPI AG |
| series |
Coatings |
| issn |
2079-6412 |
| publishDate |
2020-05-01 |
| description |
We describe lightweight three-dimensional (3D) graphene hybrid SiO<sub>2</sub> aerogels (GSAs) with hierarchically robust interconnected networks fabricated via an in situ deposition procedure after a hydrothermal assembling strategy with graphene oxide sheets. The nano-/micron-thick SiO<sub>2</sub> coating conformably grew over porous graphene templates with two constituents (e.g., graphene and SiO<sub>2</sub>) and formed chemically bonded interfaces. In addition, it significantly refined the primary graphene pores by hundreds of microns into smaller porous patterns. Studies of its mechanical properties verified that the graphene interframework made the ceramic composites elastic, while SiO<sub>2</sub> deposition enhanced the strength required it to resist deformation. The higher SiO<sub>2</sub> contents resulted in lower elasticity but larger strength because of the apparent nanosize effect of SiO<sub>2</sub> ceramic thickness; GSAs with a density of 82.3–250.3 mg/cm<sup>3</sup> (corresponding to SiO<sub>2</sub> sol with concentration ranging from 5 to 20 wt %) could reach a good balance of strength and elasticity. Benefiting from hierarchical micronetworks consisting of semiclosed or closed pores, GSAs offer excellent thermal-insulation performance, with thermal conductivity as low as 0.026 W/(m·K). GSAs offer improved fire-resistant capacity rather than that of pure carbon-based aerogels via the synergic protection of SiO<sub>2</sub> ceramic accretion. This highlights the promising applications of GSAs as lightweight thermal-shielding candidates for industrial equipment, civil architectures, and defense transportation vehicles. |
| topic |
graphene hybrid SiO<sub>2</sub> aerogels mechanical properties strength and elasticity thermal insulation fire-resistant capacities. |
| url |
https://www.mdpi.com/2079-6412/10/5/455 |
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