Facile preparation of ZrCO composite aerogel with high specific surface area and low thermal conductivity

Cui, Sheng; Suo, Hao; Feng, Jiwen; Yu, Shuwen; Xue, Jiangtao; Shen, Xiaodong; Lin, Benlan; Jiang, Shengjun; Liu, Yu

doi:10.1007/s10971-018-4638-6

Cited by 20 publications

(9 citation statements)

References 35 publications

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“…However, with a further heat treatment time for 10 h, a small amount of large pores (200 nm) emerge in the composite aerogel, which is not favorable to low thermal conductivity of the composite aerogel. After heat-treated at 1500 °C for 5 h, the thermal conductivity of carbon fiber reinforced composite aerogel is as low as 0.048 W m −1 K −1 (25 °C), which is obviously lower than that of the pure carbon fiber mat (0.063 W m −1 K −1 , 25 °C) and ZrCO composite aerogel (0.057 W m −1 K −1 ) [14].…”

Section: Resultsmentioning

confidence: 93%

“…It is noted that the mechanical strength of ZrC@Al 2 O 3 @carbon composite aerogel is higher than the oxide aerogel after carbothermal reduction process. The compressive strength is as high as 1.31 MPa, which is higher than ZrCO composite aerogel (0.87 MPa) [14]. Figure 2a exhibits the XRD patterns of the composite aerogels (Zr:Al:R = 1:1:3) calcinated at 1500 °C with different heat-treated time.…”

Section: Resultsmentioning

confidence: 99%

“…Zirconium carbide (ZrC) is a typical transition metal carbide with high melting point, extreme hardness and low density [14,15]. Thus, it has great potential of application in heat resistant insulation materials, electrode materials and coatings field [16,17].…”

Section: Introductionmentioning

confidence: 99%

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Preparation of ZrC@Al2O3@Carbon composite aerogel with excellent high temperature thermal insulation performance

et al. 2019

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The ZrC@Al 2 O 3 @carbon composite aerogels are obtained from low-cost inorganic salt of zirconium and aluminum as raw materials through sol-gel route and carbothermal reduction process. The effects of reactant molar ratios and heattreatment time on physicochemical properties of ZrC@Al 2 O 3 @carbon composite aerogels are investigated. The results show that the compressive strength of ZrC@Al 2 O 3 @carbon composite aerogel is as high as 1.31 MPa. The specific surface area of sample is as high as 650.4 m 2 g −1 , which is beneficial for its application of thermal insulation and catalyst supporting at elevated temperatures. After heat-treated at 1500 °C for 5 h, the thermal conductivity of carbon fiber mat reinforced composite aerogel is as low as 0.048 W m −1 K −1 (25 °C).

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Preparation of ZrC@Al2O3@Carbon composite aerogel with excellent high temperature thermal insulation performance

et al. 2019

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“…Therefore, when the pH value of the solution is adjusted to 2, the positive property on the surface of modified Laponite RD and the negative property on the surface of GO can be effectively utilized, and electrostatic self-assembly can be effectively realized through the interaction of heterogeneous charges, so as to realize the successful combination of AP-RD and GO. In addition, the hydroxyl group on the surface of RD and the carboxyl group, epoxy group and phenolic hydroxyl group abundant on the surface of GO can also be related through van der Waals force and hydrogen bond [23][24][25].…”

Section: Study On Modified Laponite Rd and Gomentioning

confidence: 99%

Study on the Adsorption Properties of Graphene Oxide/Laponite RD/Chitosan Composites

Liu

et al. 2021

Materials

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A novel Graphene oxide/Laponite RD/Chitosan ternary composite was synthesized by sol-gel method and freeze-drying method. The Laponite RD was silanized by 3-aminopropyltriethoxysilane (APTES). Graphene oxide (GO) was prepared by an improved Hummers method. Under the acidic conditions, self-assembly recombination was realized by electrostatic interaction between modified Laponite RD and GO. The results from Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy confirmed that the modified Laponite RD was successfully compounded with GO, and the composite is laminated and stacked. The results from BET (Brunauer–Emmett–Teller) methods found that the BET-specific surface area of the hybrid aerogel significantly increased with the increase of the doping content of the composite, and the specific surface area of the aerogel composite with 20% doping content reached 81 m2/g. The structure of aerogel is porous, and there are numerous holes in the interior, which is closely related to adsorption properties. Thermogravimetric analysis (TG) test was used to explore the change of thermal properties of hybrid aerogel materials, and it was found that the addition of composite increased the initial decomposition temperature and thermal stability of hybrid aerogel. Finally, the potential applications of aerogel were tested, such as methylene blue adsorption and CO2 adsorption.

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“…However, at elevated temperatures, e.g., above 1000 °C, aerogels become highly densified with a loss in nanopores . Recently, various types of aerogels have been studied for applications at high temperatures, e.g., metal oxide aerogels (Al 2 O 3 , ZrO 2 , MgO, rare earth oxide), − carbon aerogels, carbide aerogels (SiC, ZrC), , nitride aerogels (Si 3 N 4 , BN), , and boride aerogels (ZrB 2 , HfB 2 ) . Among them, the ZrO 2 aerogel is interesting and important because of its high melting point, lowest intrinsic thermal conductivity among metal oxides, and both acid and base active centers .…”

Section: Introductionmentioning

confidence: 99%

Thermally Stable Nanoporous ZrO₂/SiO₂ Hybrid Aerogels for Thermal Insulation

Liu

Gao

Liu

et al. 2019

ACS Appl. Nano Mater.

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Compared with single-component aerogels, hybrid aerogels with multiple components possess enhanced properties, especially high thermal stabilities. Thermal stability improvement depends on the mixing between the various components. In the present research, a ZrO2/SiO2 hybrid aerogel was representatively chosen to study the mixing behaviors and resultant thermal stabilities. A series of ZrO2/SiO2 hybrid aerogels were synthesized by using different sol–gel parameters to study shrinkage, nanopore collapse, and crystallization behavior upon heat treatment. The sol–gel hybridization of weakly branched ZrO2 and SiO2 clusters was found to provide maximum mixing of ZrO2/SiO2. The highly mixed hybrid aerogel, with a ratio of 86/14 w/w ZrO2/SiO2, showed the best thermal stability. The thermally stable ZrO2/SiO2 hybrid aerogel, after incorporation into a mullite fiber blanket, showed very low thermal conductivities of 0.026 ± 0.001, 0.037 ± 0.001, and 0.058 ± 0.002 W/(m K) at 600, 800, and 1000 °C, respectively. It was suggested that weakly branched ZrO2 and SiO2 clusters preferred to freely tangle with each other during the preparation procedure, achieving the most highly mixed ZrO2/SiO2 hybrid with the maximum synergistic effect. This hybrid strategy may provide pathways in designing other multiple-component hybrid aerogels.

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Facile preparation of ZrCO composite aerogel with high specific surface area and low thermal conductivity

Cited by 20 publications

References 35 publications

Preparation of ZrC@Al2O3@Carbon composite aerogel with excellent high temperature thermal insulation performance

Preparation of ZrC@Al2O3@Carbon composite aerogel with excellent high temperature thermal insulation performance

Study on the Adsorption Properties of Graphene Oxide/Laponite RD/Chitosan Composites

Thermally Stable Nanoporous ZrO₂/SiO₂ Hybrid Aerogels for Thermal Insulation

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Facile preparation of ZrCO composite aerogel with high specific surface area and low thermal conductivity

Cited by 20 publications

References 35 publications

Preparation of ZrC@Al2O3@Carbon composite aerogel with excellent high temperature thermal insulation performance

Preparation of ZrC@Al2O3@Carbon composite aerogel with excellent high temperature thermal insulation performance

Study on the Adsorption Properties of Graphene Oxide/Laponite RD/Chitosan Composites

Thermally Stable Nanoporous ZrO2/SiO2 Hybrid Aerogels for Thermal Insulation

Contact Info

Product

Resources

About

Thermally Stable Nanoporous ZrO₂/SiO₂ Hybrid Aerogels for Thermal Insulation