A simple and efficient method for the preparation of SiO2/PI/AF aerogel composite fabrics and their thermal insulation performance

Xue, Rujing; Liu, Guoliang; Liu, Fujuan

doi:10.1016/j.ceramint.2022.08.330

Cited by 14 publications

(2 citation statements)

References 38 publications

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“…The development of aerogel insulation using aramid fiber composites was introduced in [24]. The study included the synthesis of aerogels using tetraethoxysilane (TEOS) as the precursor, polyimide (PI) powder as the reinforcing agent, and nonwoven AF as the substrate.…”

Section: Introductionmentioning

confidence: 99%

Study of Energy Saving Using Silica Aerogel Insulation in a Residential Building

Thie

Quallen

Ibrahim

et al. 2023

Gels

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Energy consumption, specifically in the building sector, is expected to rise. One potential way to reduce energy consumption, or to slow this increase, is to reduce the heat loss in residential homes. Silica aerogels have grown in popularity as an insulating material due to their extremely low thermal conductivity. However, the benefits of using silica aerogels as an insulator in residential buildings have not been thoroughly studied. To understand the benefits of using silica aerogels as a thermal insulator in residential homes, experimentally validated simulations were performed. The simulations were performed on a model of a full-scale residential house using the multiphysics software ANSYS FLUENT 2019 R2. The simulations helped predict the actual saving benefits of using aerogels as an insulator. Aerogels have the potential to be used as an insulator in both the walls and windows due to its semitransparency. The results showed that the average kWh savings using one half-inch layer of wall aerogel insulation coupled with window aerogel insulation was 20.9% for the single-family house compared to traditional insulation. On average, the energy lost through the windows was 39.1% lower when using aerogel insulation compared to standard insulating materials. The energy lost through the house walls was 13.3% lower on average when using a thin layer of aerogel insulation. While a thin layer of aerogel insulation provided a benefit when used in the house walls, the potential for savings per quantity used was greater in the windows.

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Section: Introductionmentioning

confidence: 99%

Study of Energy Saving Using Silica Aerogel Insulation in a Residential Building

Thie

Quallen

Ibrahim

et al. 2023

Gels

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“…Moreover, various materials are also believed to selectively reflect or scatter electromagnetic waves in multiple bands, such as microwave and mid- to long-wave infrared. These materials include semiconductor oxides with high electrical conductivity (e.g., antimony-doped tin dioxide (ATO) [ 18 ]), two-dimensional layered materials with tunable bandgap (e.g., Mxene [ 19 ]), micro/nano-structured metamaterials with strong light–matter interactions (e.g., metal–dielectric–metal (MDM) film [ 20 ]), and high refractive-index dielectrics (e.g., SiO 2 [ 21 , 22 ]). Therefore, current research efforts are mainly devoted to preparing highly conductive fabrics and constructing unique surfaces/interfaces for compatible modulation or manipulation of microwave and infrared waves.…”

Section: Introductionmentioning

confidence: 99%

Construction Strategy for Flexible and Breathable SiO2/Al/NFs/PET Composite Fabrics with Dual Shielding against Microwave and Infrared–Thermal Radiations for Wearable Protective Clothing

Ye,

Liu,

et al. 2023

Polymers

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Microwave and infrared–thermal radiation-compatible shielding fabrics represent an important direction in the development of wearable protective fabrics. Nevertheless, effectively and conveniently integrating compatible shielding functions into fabrics while maintaining breathability and moisture permeability remains a significant challenge. Here, we take hydrophilic PVA-co-PE nanofibrous film-coated PET fabric (NFs/PET) as a flexible substrate and deposit a dielectric/conductive (SiO2/Al) bilayer film via magnetron sputtering. This strategy endows the fabric surface with high electrical conductivity, nanoscale roughness comparable to visible and infrared waves, and a dielectric–metal contact interface possessing localized plasmon resonance and Mie scattering effects. The results demonstrate that the optimized SiO2/Al/NFs/PET composite conductive fabric (referred to as S4-1) possesses favorable X-band electromagnetic interference (EMI) shielding effectiveness (50 dB) as well as excellent long-wave infrared (LWIR) shielding or IR stealth performance (IR emissivity of 0.60). Notably, the S4-1 fabric has a cooling effect of about 12.4 °C for a heat source (80 °C) and an insulating effect of about 17.2 °C for a cold source (−20 °C), showing excellent shielding capability for heat conduction and heat radiations. Moreover, the moisture permeability of the S4-1 fabric is about 300 g/(m2·h), which is better than the requirement concerning moisture permeability for wearable fabrics (≥2500–5000 g/(m2·24 h)), indicating excellent heat and moisture comfort. In short, our fabrics have lightweight, thin, moisture-permeable and excellent shielding performance, which provides novel ideas for the development of wearable multi-band shielding fabrics applied to complex electromagnetic environments.

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Double‐Phase‐Networking Polyimide Hybrid Aerogel with Exceptional Dimensional Stability for Superior Thermal Protection System

Liu,

Wang,

Wang

et al. 2024

Small

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Polyimide aerogels have been extensively used in thermal protection domain because they possess a combination of intrinsic characteristics of aerogels and unique features of polyimide. However, polyimide aerogels still suffer significant thermally induced shrinkage at temperatures above 200 °C, restricting their application at high temperature. Here, a novel “double‐phase‐networking” strategy is proposed for fabricating a lightweight and mechanically robust polyimide hybrid aerogel by forming silica–zirconia‐phase networking skeletons, which possess exceptional dimensional stability in high‐temperature environments and superior thermal insulation. The rational mechanism responsible for the formation of double‐phase‐networking aerogel is further explained, generally attributing to chemical crosslinking reactions and supramolecular hydrogen bond interactions derived from the main chains of polyimide and silane/zirconia precursor/sol. The as‐prepared aerogels exhibit excellent high‐temperature (270 °C) dimensional stability (5.09% ± 0.16%), anti‐thermal‐shock properties, and low thermal conductivity. Moreover, the hydrophobic treatment provides aerogels high water resistance with water contact angle of 136.9°, further suggestive of low moisture content of 3.6% after exposure to 70 °C and 85% relative humidity for 64 h. The proposed solution for significantly enhancing high‐temperature dimensional stability and thermal insulation provides a great supporting foundation for fabricating high‐performance organic aerogels as thermal protection materials in aerospace.

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A simple and efficient method for the preparation of SiO2/PI/AF aerogel composite fabrics and their thermal insulation performance

Cited by 14 publications

References 38 publications

Study of Energy Saving Using Silica Aerogel Insulation in a Residential Building

Study of Energy Saving Using Silica Aerogel Insulation in a Residential Building

Construction Strategy for Flexible and Breathable SiO2/Al/NFs/PET Composite Fabrics with Dual Shielding against Microwave and Infrared–Thermal Radiations for Wearable Protective Clothing

Double‐Phase‐Networking Polyimide Hybrid Aerogel with Exceptional Dimensional Stability for Superior Thermal Protection System

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