Thermal conductivity of glass fiber-reinforced silica aerogels using molecular dynamics simulations

Patil, Sandeep P.; Bachhav, Bhagyashri S.; Markert, Bernd

doi:10.1016/j.ceramint.2021.10.002

Cited by 28 publications

(9 citation statements)

References 48 publications

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“…Introducing a second phase is the main means of enhancing aerogels. A series of one-dimensional materials in micro-scale or nano-scale are applied to strengthen aerogels while maintaining high porosity and low density, such as glass bers [7,12] , mullite bers [13] , carbon bers [14] , carbon nanotubes (CNTs) [15] . In addition, opaci ers are added to the silica aerogel matrix to suppress infrared radiation transmission to improve the poor thermal insulation property at high temperature, such as SiC powders [16][17][18] , carbon black [19] and TiO 2 powders [20] .…”

Section: Introductionmentioning

confidence: 99%

SiO2 aerogel multiscale reinforced by glass fibers and SiC nanowhiskers for thermal insulation

Yang

Chen

et al. 2023

J Porous Mater

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SiO 2 aerogel attracts much interest as thermal insulation material due to ultra-low density and excellent thermal performance at room temperature. However, the poor mechanical property and a mass of heat transfer by radiation in high temperature limit application of aerogels. Herein, a novel aerogel composites multiscale reinforced by glass bers with SiC nanowhiskers (SiC nw ) (AFW) was prepared. SiC nw were evenly distributed in glass bers felts by freezing-drying method to form a uniform multiscale felts. The SiC nw inside felts provided more contact point with aerogel to increase the interfacial adhesion force so that compressive stress of AFW with 4% volume fraction SiC nw was increased to 0.29MPa. SiC nw blocked infrared radiation to decrease the heat transfer. Therefore, Even though SiC nw raised thermal conductivity of aerogels at room temperature, thermal conductivity at 500℃ of AFW with was only 0.040 W/(m•K). In another word SiC nw reduced the sensitivity of thermal conductivity to temperature. AFW shows potential in the eld of medium and high temperature insulation.

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Section: Introductionmentioning

confidence: 99%

SiO2 aerogel multiscale reinforced by glass fibers and SiC nanowhiskers for thermal insulation

Yang

Chen

et al. 2023

J Porous Mater

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“…Typically, a FRAB is composed of aerogel particles covering a network of reinforcing fibers (polymer or ceramic) acting as a supporting skeleton. The random porosity is due to the void spaces between the covered fibers [ 10 ]. The implementation of fibers has undoubted advantages for strengthening purposes while maintaining extremely low thermal conductivity (ranging between 0.017 and 0.04 W/m × K), almost comparable to that of “pure” aerogel [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Aerogel Technology for Thermal Insulation of Cryogenic Tanks—Numerical Analysis for Comparison with Traditional Insulating Materials

Sambucci

Savoni

Valente

2023

Gels

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The traditional choice of insulation material for liquefied natural gas (LNG) transportation with cryogenic tankers is the back-filled perlite-based system. However, aiming to further cut down the insulation cost, spare additional arrangement space, and provide safety in installation and maintenance, the requirement of looking for alternative materials still exists. Fiber-reinforced aerogel blankets (FRABs) could represent good candidates in designing insulation layers for LNG cryogenic storage because of their ability to ensure adequate thermal performance without the need to create deep vacuum conditions in the annular space of the tank. In this work, a finite element method (FEM) model was developed to study the thermal insulation performance of a commercial FRAB (Cryogel ® Z) for application in cryogenic storage/transport LNG tanks, comparing it with the performance of traditional perlite-based systems. Within the reliability limits of the computational model, the analysis proved that FRAB insulation technology gave encouraging results and might be potentially scalable for transporting cryogenic liquid. In addition to demonstrating superior performance in terms of thermal insulating efficiency and boil-off rate over the perlite-based system, as far as a perspective of cost savings and space gain, FRAB technology allows for higher levels of insulation without vacuum and with lower thickness of the outer shell, which is therefore beneficial for storing more material and lightening the weight of the LNG transportation semitrailer.

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“…Aerogels, with their low thermal conductivity, nanoporous structure, and high specific surface area, occupy an irreplaceable role in thermal management applications such as construction, pipe insulation, and aerospace, making the search for a strategy to improve the mechanical properties of aerogels an urgent issue. − Embedded fibers are an effective strategy for enhancing the mechanical properties of aerogel materials, standing out among methods such as optimizing the internal structure and cross-linking polymers, among others. − Inorganic fibers, particularly glass − and ceramic fibers, − have expanded the application of FACs in extreme temperatures. However, the massive introduction of fibers inevitably results in a high density of the material and a deterioration of the insulation properties. , This becomes a bottleneck that hinders the practical application of the material.…”

Section: Introductionmentioning

confidence: 99%

A Two-Step Route to SiO₂ Nanofiber-Reinforced Aerogel Composites with Lightweight and High Temperature Resistance for Thermal Insulation

Xing

Jiao

et al. 2023

ACS Appl. Nano Mater.

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Fiber reinforcement is an effective method to improve the inherent brittleness of conventional aerogels. However, high-density and complex preparation processes plague fiber-reinforced aerogel composites (FACs). For example, they are usually prepared using costly supercritical drying, freeze-drying, and time-consuming atmospheric drying, limiting the further development in applications and technologies of the material. Herein, a straightforward route to FACs is proposed. Namely, electrostatically spun nanofibers are used as reinforcement materials for aerogels. The nanofiber composite silica gel precursors are produced using chemical swelling and sol–gel techniques. Direct calcination is then used to prepare FACs with distinct nanoporous structures. As a result, FACs have a thermal conductivity as low as 0.029 W m–1 K–1 at room temperature, a high porosity of up to 99.55%, and excellent temperature resistance, maintaining a stable porous structure even at 1400 °C. Therefore, FACs have greater potential for thermal insulation applications. The route described in this study will contribute to the opening of a pathway for the simple preparation of FACs with ultralow density and high temperature resistance, thereby promoting the application and development of nanofiber-reinforced aerogel materials.

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Thermal conductivity of glass fiber-reinforced silica aerogels using molecular dynamics simulations

Cited by 28 publications

References 48 publications

SiO2 aerogel multiscale reinforced by glass fibers and SiC nanowhiskers for thermal insulation

SiO2 aerogel multiscale reinforced by glass fibers and SiC nanowhiskers for thermal insulation

Aerogel Technology for Thermal Insulation of Cryogenic Tanks—Numerical Analysis for Comparison with Traditional Insulating Materials

A Two-Step Route to SiO₂ Nanofiber-Reinforced Aerogel Composites with Lightweight and High Temperature Resistance for Thermal Insulation

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Thermal conductivity of glass fiber-reinforced silica aerogels using molecular dynamics simulations

Cited by 28 publications

References 48 publications

SiO2 aerogel multiscale reinforced by glass fibers and SiC nanowhiskers for thermal insulation

SiO2 aerogel multiscale reinforced by glass fibers and SiC nanowhiskers for thermal insulation

Aerogel Technology for Thermal Insulation of Cryogenic Tanks—Numerical Analysis for Comparison with Traditional Insulating Materials

A Two-Step Route to SiO2 Nanofiber-Reinforced Aerogel Composites with Lightweight and High Temperature Resistance for Thermal Insulation

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Product

Resources

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A Two-Step Route to SiO₂ Nanofiber-Reinforced Aerogel Composites with Lightweight and High Temperature Resistance for Thermal Insulation