Reinforced and superinsulating silica aerogel through in situ cross-linking with silane terminated prepolymers

Iswar, Subramaniam; Snellings, Geert; Zhao, Shanyu; Erni, Rolf; Bahk, Yeon Kyoung; Wang, Jing; Lattuada, Marco; Koebel, Matthias M.; Malfait, Wim J.

doi:10.1016/j.actamat.2018.01.031

Cited by 30 publications

(9 citation statements)

References 43 publications

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“…In fact, this strategy is very efficient in making larger aerogels that have better machinability. Some works, however, report silica aerogels without reinforcement (polymers or fibers) [69,71,72,76,78]. Regarding the processing, the majority of works compiled in Table 4 were prepared with TEOS as silica source (or as a co-precursor) [66,67,69,71,[73][74][75][76][77][78][79][80][81].…”

Section: Silica Aerogels: Effect Of Structural Properties On the Ther...mentioning

confidence: 99%

“…Some works, however, report silica aerogels without reinforcement (polymers or fibers) [69,71,72,76,78]. Regarding the processing, the majority of works compiled in Table 4 were prepared with TEOS as silica source (or as a co-precursor) [66,67,69,71,[73][74][75][76][77][78][79][80][81]. Ambient pressure drying (i.e., evaporation of the solvent at ambient pressure) is also becoming more common in superinsulating materials [66,69,[72][73][74]77].…”

Section: Silica Aerogels: Effect Of Structural Properties On the Ther...mentioning

confidence: 99%

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Thermal Conductivity of Nanoporous Materials: Where Is the Limit?

et al. 2022

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Nowadays, our society is facing problems related to energy availability. Owing to the energy savings that insulators provide, the search for effective insulating materials is a focus of interest. Since the current insulators do not meet the increasingly strict requirements, developing materials with a greater insulating capacity is needed. Until now, several nanoporous materials have been considered as superinsulators achieving thermal conductivities below that of the air 26 mW/(m K), like nanocellular PMMS/TPU, silica aerogels, and polyurethane aerogels reaching 24.8, 10, and 12 mW/(m K), respectively. In the search for the minimum thermal conductivity, still undiscovered, the first step is understanding heat transfer in nanoporous materials. The main features leading to superinsulation are low density, nanopores, and solid interruptions hindering the phonon transfer. The second crucial condition is obtaining reliable thermal conductivity measurement techniques. This review summarizes these techniques, and data in the literature regarding the structure and thermal conductivity of two nanoporous materials, nanocellular polymers and aerogels. The key conclusion of this analysis specifies that only steady-state methods provide a reliable value for thermal conductivity of superinsulators. Finally, a theoretical discussion is performed providing a detailed background to further explore the lower limit of superinsulation to develop more efficient materials.

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Section: Silica Aerogels: Effect Of Structural Properties On the Ther...mentioning

confidence: 99%

Section: Silica Aerogels: Effect Of Structural Properties On the Ther...mentioning

confidence: 99%

Thermal Conductivity of Nanoporous Materials: Where Is the Limit?

et al. 2022

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“…When the sample was converted from SiC/aerogel-12 to SiC/aerogel-24, the s increased, while the e decreased. The reason why the thermal conductivity of the SiC/aerogel-12 was lower than that of SiC/aerogel-24 could be certified by the equations (2) to (5).…”

Section: Thermal Insulation Of Sic/aerogelmentioning

confidence: 99%

“…Recently, many researchers put their effort into modifying the silica aerogel composite to improve the mechanical strength without sacrificing the thermal conductivity. Iswar et al 5 produced strong silica aerogels based on the polyethoxydisiloxane precursor. However, the process was followed by complex hydrophobization and supercritical CO 2 drying.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and thermal properties of reticulated SiC aerogel composite prepared by template method

Chen

et al. 2019

Journal of Composite Materials

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A novel structure-controllable reticulated silicon carbide (SiC) skeleton-reinforced silica aerogel composites (SiC/aerogel) were fabricated successfully by template method. Three-dimensional SiC skeletons prepared by different deposition time were prepared via the chemical vapor deposition technology, and then the silica aerogel was induced by the sol–gel process. The test results showed that the mechanical properties increased and thermal conductivities decreased remarkably after impregnating reticulated SiC skeleton with silica aerogel. The SiC/aerogel-24 possessed the highest compressive strength of 0.82 MPa with the thermal conductivity of 0.1597 W/(m·K) at 600℃, while the SiC/aerogel-12 exhibited the lowest thermal conductivity of 0.1244 W/(m·K) and its compressive strength was 0.64 MPa. The present work reported a novel method to manufacture the structure-controllable reticulated SiC aerogel composite which could be used as a high-temperature super-thermal insulation material for the potential applications.

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“…However, entry into mainstream insulation markets is limited because of two important drawbacks: i) the poor mechanical properties and ii) the high production cost. Improving the mechanical properties of silica aerogel has been and continues to be a topic of intense academic research [5][6][7][8][9][10][11][12][13][14][15][16], but until now, none of the resulting materials are available in industrial quantities, despite the excellent thermal and mechanical properties. This inability of these strong aerogels to reach the market highlights the importance of cost as the major barrier for market entry for reinforced aerogels and for market growth for regular silica aerogel.…”

Section: Introductionmentioning

confidence: 99%