A flexible silica aerogel with good thermal and acoustic insulation prepared via water solvent system

Li, Xiaohua; Yang, Zichun; Li, Kunfeng; Zhao, Shuang; Fei, Zhifang; Zhang, Zhen

doi:10.1007/s10971-019-05107-y

Cited by 33 publications

(12 citation statements)

References 23 publications

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“…As mentioned before, SAs have unique properties that have made them attractive in many areas [ 159 ]. For example, they can be used (1) as absorbents of oils and organic liquids, to control accidental and deliberate releases of these substances during transportation and storage [ 160 ]; (2) as humidity sensors and matrices for biosensors [ 161 ]; (3) in thermal and acoustic insulation [ 162 , 163 ]; (4) as catalysts, photocatalysts, or catalyst carriers [ 164 , 165 ]; (5) as sorbents to capture CO 2 gas [ 166 ]; (6) in the removal of air pollutants—such as benzene, toluene, ethylbenzene, and xylene (BTEX) [ 167 ]—or, in general, of volatile organic compounds (VOCs) [ 168 ]; or (7) in wastewater treatments, such as in the removal of dyes [ 169 ], or of heavy metal ions [ 170 ].…”

Section: Silica Aerogelsmentioning

confidence: 99%

Porous Aerogels and Adsorption of Pollutants from Water and Air: A Review

2021

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Aerogels are open, three-dimensional, porous materials characterized by outstanding properties, such as low density, high porosity, and high surface area. They have been used in various fields as adsorbents, catalysts, materials for thermal insulation, or matrices for drug delivery. Aerogels have been successfully used for environmental applications to eliminate toxic and harmful substances—such as metal ions or organic dyes—contained in wastewater, and pollutants—including aromatic or oxygenated volatile organic compounds (VOCs)—contained in the air. This updated review on the use of different aerogels—for instance, graphene oxide-, cellulose-, chitosan-, and silica-based aerogels—provides information on their various applications in removing pollutants, the results obtained, and potential future developments.

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Section: Silica Aerogelsmentioning

confidence: 99%

Porous Aerogels and Adsorption of Pollutants from Water and Air: A Review

2021

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“…The methyl groups repel each other after the aerogel is compressed, facilitating the recovery of the aerogel skeleton and leading to more resilience. [ 45 ]…”

Section: Resultsmentioning

confidence: 99%

Moisture‐Resistant and Mechanically Strong Polyimide‐Polymethylsilsesquioxane Hybrid Aerogels with Tunable Microstructure

Wang

Liu

et al. 2021

Macro Materials & Eng

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Moisture‐resistant and mechanically strong polyimide (PI)‐polymethylsilsesquioxane hybrid aerogels with doubly cross‐linked structures are synthesized through sol–gel technology and supercritical CO2 fluid drying. By using bis(trimethoxysilylpropyl) amine as a cross‐linker, the end‐capped polyamide acid derived from biphenyl‐3,3′,4,4′‐tetracarboxylic dianhydride and 4,4′‐oxydianiline is cross‐linked with a silica network using methyltrimethoxysilane as the silica source precursor. The resultant hybrid aerogels show low density (0.12–0.15 g cm−3), low thermal conductivity (0.032–0.049 W m−1 K−1), high hydrophobicity (125–140°) and good thermal stability (above 435 °C) with tunable microstructure. With the increase of silica sol volume, the microstructure of hybrid aerogels transforms from fibrous network to hierarchical microstructure. Aerogels with high content of silica sol exhibit good moisture resistance, high Young's modulus (Max. 19.6 MPa), and high specific modulus (Max. 131 kN m kg−1), which are attributed to their unique hierarchical microstructure with a sheet skeleton. These hybrid aerogels are promising in the fields of thermal insulation, aerospace applications and so on.

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“…Hence, surfactants can be defined as a determinant factor that heavily influences the porosity of the aerogel, while it has been previously reported that a mixture of surfactants is acknowledged to possess improved physicochemical properties due to synergic effects between cationic and anionic surfactants 23 . Cetyltrimethylammonium bromide (CTAB) for instance --one of the most commonly used cationic surfactants --is responsible for the change of the gel skeleton structure from a course granular morphology to continuous fiber as its concentration gradually increases 24 . Another benefit of including CTAB during synthesis of silica aerogels is the decrease of the extent phase separation that would result from using precursors from the siloxane groups and water as solvent, with the surfactant being accountable for promoting miscibility of water and the organic components present, therefore overcoming the strong hydrophobicity of the siloxane networks 25 .…”

Section: Introductionmentioning

confidence: 99%

“…23 Cetyltrimethylammonium bromide (CTAB) for instance -one of the most commonly used cationic surfactants -is responsible for the change of the gel skeleton structure from a course granular morphology to continuous fiber as its concentration gradually increases. 24 Another benefit of including CTAB during the synthesis of silica aerogels is the decrease of the extent of phase separation that would result from using precursors from the siloxane groups and water as the solvent, with the surfactant being accountable for promoting the miscibility of water and the organic components present, therefore overcoming the strong hydrophobicity of the siloxane networks. 25 On the other hand, surfactant induced self-assembly has been reported to adequately control the morphology of porous nanostructures in aerogels, which, in turn, regulates their thermal insulation performance.…”

Section: Introductionmentioning

confidence: 99%