Highly elastic and fatigue resistant wood/silica composite aerogel operated at extremely low temperature

Yan, Ming‐Yuan; Fu, Yangyang; Pan, Yuelei; Gong, Lunlun; Zhou, Yong; Ahmed, Hoda; Zhang, Heping

doi:10.1016/j.compositesb.2021.109496

Cited by 42 publications

(15 citation statements)

References 51 publications

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“…The ANF/CNT/PPy sensory system was stable after 1000 deformation/recovery cycles (Figure S12). Due to the hydrogen bonding between ANF/CNT and the coating of PPy, the ANF/CNT/PPy aerogel fibers have good structural stability and resilience. , Therefore, the ANF/CNT/PPy aerogel signal transmitter has the advantages of short signaling time, portability, and flexibility.…”

Section: Resultsmentioning

confidence: 99%

In Situ Loading of Polypyrrole onto Aramid Nanofiber and Carbon Nanotube Aerogel Fibers as Physiology and Motion Sensors

Huang

et al. 2022

ACS Nano

103

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Nanocomposite conductive fiber has been newly developed as a lightweight material with high flexibility and strong weavability, which can meet the requirements of flexible wearable devices. Herein, lightweight porous aramid nanofibers (ANF) and carbon nanotube (CNT) aerogel fibers coated with polypyrrole (PPy) layers are prepared by a wet spinning method for motion detection and information transmission. The ANF/CNT/PPy aerogel fiber with low density (56.3 mg/cm3), conductivity (6.43 S/m), and tensile strength (2.88 MPa) were used as motion sensors with high sensitivity (0.12) and long life (1000 cycles). At the same time, the differential conductivity of aerogel fibers is utilized to reduce the information transmission time (up to 46%). High- and low-temperature-resistant (−196 to 100 °C) aerogel fibers are also available as a quick heater and ionic solution detector. In summary, the prepared ANF/CNT/PPy aerogel fiber can be used as a multifunctional sensor for human-health detection and motion monitoring.

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Section: Resultsmentioning

confidence: 99%

In Situ Loading of Polypyrrole onto Aramid Nanofiber and Carbon Nanotube Aerogel Fibers as Physiology and Motion Sensors

Huang

et al. 2022

ACS Nano

103

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“…Owing to their overall performance such as low thermal conductivity, relatively low cost, and excellent flame resistance, silica aerogels became commercially available in large-scale production and have been potentially used as Cherenkov radiators and drug carriers [ 3 , 4 , 5 , 10 ]. Furthermore, they have been widely used for thermal insulation applications due to their extremely low thermal conductivity [ 11 , 12 , 13 , 14 , 15 , 16 ]. For example, silica-aerogel-based rubber composite has been used as alternative thermal insulation in buildings [ 11 ]; a silica-polyimide aerogel blanket has been used as artificial island thermal insulation [ 12 ]; a highly elastic silica composite aerogel has been used at extremely low temperatures [ 13 ]; silica aerogel phase-change materials have been used for both extremely low and high temperatures [ 14 ]; alumina–silica aerogels have been used for thermal insulation at 1500 °C [ 15 ]; a highly transparent silica aerogel monolith has been used for solar heating and heat preservation [ 16 ]; etc.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, they have been widely used for thermal insulation applications due to their extremely low thermal conductivity [ 11 , 12 , 13 , 14 , 15 , 16 ]. For example, silica-aerogel-based rubber composite has been used as alternative thermal insulation in buildings [ 11 ]; a silica-polyimide aerogel blanket has been used as artificial island thermal insulation [ 12 ]; a highly elastic silica composite aerogel has been used at extremely low temperatures [ 13 ]; silica aerogel phase-change materials have been used for both extremely low and high temperatures [ 14 ]; alumina–silica aerogels have been used for thermal insulation at 1500 °C [ 15 ]; a highly transparent silica aerogel monolith has been used for solar heating and heat preservation [ 16 ]; etc. It can be concluded that almost all the applications of silica aerogels in thermal insulation are based on their low thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Passive Daytime Radiative Cooling of Silica Aerogels

Cheng

et al. 2023

Nanomaterials

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Silica aerogels are one of the most widely used aerogels, exhibiting excellent thermal insulation performance and ultralow density. However, owing to their plenitude of Si-O-Si bonds, they possess high infrared emissivity in the range of 8–13 µm and are potentially robust passive radiative cooling (PRC) materials. In this study, the PRC behavior of traditional silica aerogels prepared from methyltrimethoxysilane (MTMS) and dimethyldimethoxysilane (DMDMS) in outdoor environments was investigated. The silica aerogels possessed low thermal conductivity of 0.035 W/m·K and showed excellent thermal insulation performance in room environments. However, sub-ambient cooling of 12 °C was observed on a clear night and sub-ambient cooling of up to 7.5 °C was achieved in the daytime, which indicated that in these cases the silica aerogel became a robust cooling material rather than a thermal insulator owing to its high IR emissivity of 0.932 and high solar reflectance of 0.924. In summary, this study shows the PRC performance of silica aerogels, and the findings guide the utilization of silica aerogels by considering their application environments for achieving optimal thermal management behavior.

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“…Aerogels are highly porous open-cell solid materials (

90% open porosity) prepared by a supercritical drying process. The extremely low thermal conductivity (0.013 W/m × K) makes aerogels attractive thermal super-insulators mainly by minimizing heat conduction through their low density (80–200 kg/m 3 ) and tortuous solid nanostructure (mesopore diameters between 4 and 20 nm) [ 8 , 9 ]. However, this is obtained at the expense of physical and mechanical properties.…”

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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Highly elastic and fatigue resistant wood/silica composite aerogel operated at extremely low temperature

Cited by 42 publications

References 51 publications

In Situ Loading of Polypyrrole onto Aramid Nanofiber and Carbon Nanotube Aerogel Fibers as Physiology and Motion Sensors

In Situ Loading of Polypyrrole onto Aramid Nanofiber and Carbon Nanotube Aerogel Fibers as Physiology and Motion Sensors

Passive Daytime Radiative Cooling of Silica Aerogels

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

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