Advances on Dimensional Structure Designs and Functional Applications of Aerogels

Wang, Jing; Wang, Jin

doi:10.6023/a20110531

Cited by 12 publications

(11 citation statements)

References 124 publications

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“…Aerogels are the type of nanoporous materials possessing extremely low density, low thermal conductivity, high porosity, and high pore volume, and are potentially used in various fields such as environment, energy, cosmetic, transportation, building, catalyst, and biomedicine (Koebel et al, 2012;Ziegler et al, 2017;Vareda et al, 2018;Qie et al, 2020;Wei et al, 2020;Wang and Wang, 2021). Among a variety of aerogels, silica aerogels are the most frequently used aerogels owing to their relatively low price, ease of scale-up, and excellent overall properties (Du et al, 2013;Chen et al, 2017;Wang et al, 2017Wang et al, , 2018Li T. et al, 2018;Li X. et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Liu¹,

Wang²,

Liao³

et al. 2021

Front. Mater.

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A robust silica–polyimide (PI) aerogel blanket is designed and synthesized using the PI foam as the matrix and silica aerogel as the filler through an in situ method, where sol–gel transition of silica precursor occurs in pores of the PI foam, followed by the hydrophobization and ambient pressure drying. The density of the aerogel blanket ranges from 0.036 to 0.196 g/cm3, and the low density is directly controlled by tailoring the silica concentration. The specific surface area of the aerogel blanket reaches 728 m2/g. These features of the blanket result in a low thermal conductivity of 0.018 W/mK, which shows a remarkable reduction of 59% compared to that of the PI foam (0.044 W/mK). As a result, a remarkable decrease of 138°C is achieved using the silica blanket as the thermal insulator on a hot plate of approximately 250°C. In addition, the temperature degradation of the blanket is around 500°C, and up to 86% of mass remaining at 900°C is obtained. The blanket is resistant at extremely harsh conditions, e.g., 600°C for 30 min and 1,300°C for 1 min, and no open flame is observed, suggesting a significant flame-retardant of the blanket. Owing to the three-dimensional (3D) porous framework of the PI foam, the silica aerogel is encapsulated in the PI foam and the blanket exhibits strong mechanical property. The silica–PI aerogel can be reversibly compressed for 50 cycles without reduction of strain. The contact angle of the blanket is 153°, which shows a superior waterproof property. Combining with the low density, low thermal conductivity, flame-retardant, and strong mechanical strength, the aerogel blanket has the potential as an artificial island, which is safe (waterproof and flame-retardant), lightweight, comfortable, and easy to be moved.

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Section: Introductionmentioning

confidence: 99%

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Liu¹,

Wang²,

Liao³

et al. 2021

Front. Mater.

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“…Interestingly, the highly transparent silica aerogels with ultralow thermal conductivity can be ideal candidates for the upper layer, which can be synthesized by the sol–gel method, where methyltrimethoxysilane (MTMS) was used as the precursor. − The photo images of the samples, including the transparent wet gel, solvent exchange, and the final sample, are shown in Figure S1A–C (Supporting Information); Figure E shows the photo image of the transparent silica aerogel, and the buildings behind the aerogel can be clearly seen. Due to Rayleigh scattering, the silica aerogel appears yellow in the backlight and blue in the front light (Figure S2, Supporting Information). , The aerogel was used as the upper layer to mimic the transparent, hydrophobic, and thermal insulation hair. A glass plate coated with black paint was used as the middle PTCM layer, which exerted the effect of black skin, absorbing sunlight and converting it into thermal energy.…”

Section: Resultsmentioning

confidence: 99%

“…Due to Rayleigh scattering, the silica aerogel appears yellow in the backlight and blue in the front light (Figure S2, Supporting Information). 38,39 The aerogel was used as the upper layer to mimic the transparent, hydrophobic, and thermal insulation hair. A glass plate coated with black paint was used as the middle PTCM layer, which exerted the effect of black skin, absorbing sunlight and converting it into thermal energy.…”

Section: Concept and Designmentioning

confidence: 99%

Bioinspired Multilayer Structures for Energy-Free Passive Heating and Thermal Regulation in Cold Environments

Wang

Shan

et al. 2022

ACS Appl. Mater. Interfaces

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Passive thermal regulation has attracted increasing interest owing to its zero-energy consumption capacity, which is expected to alleviate current crises in fossil energy and global warming. In this study, a biomimetic multilayer structure (BMS) comprising a silica aerogel, a photothermal conversion material (PTCM), and a phase change material (PCM) layer is designed inspired by the physiological skin structure of polar bears for passive heating with desirable temperature and endurance. The transparent silica aerogel functions as transparent hairs and allows solar entry and prevents heat dissipation; the PTCM, a glass plate coated with black paint, acts as the black skin to convert the incident sunlight into heat; and the PCM composed of n-octadecane microcapsules stores the heat, regulating temperature and increasing endurance. Impressively, outdoor and simulated experiments indicate efficient passive heating (increment of 60 °C) of the BMS in cold environments, and endurance of 157 and 92 min is achieved compared to a single aerogel and PTCM layer, respectively. The uses of the BMS for passive heating of model houses in winter show an increase of 12.1 °C. COMSOL simulation of the BMSs in high latitudes indicates robust heating and endurance performance in a −20 °C weather. The BMS developed in this study exhibits a smart thermal regulation behavior and paves the way for passive heating in remote areas where electricity and fossil energy are unavailable in cold seasons.

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“…An aerogel sphere is a kind of porous solid material with high porosity, ultra-low density, and heat insulation that is composed of polymer molecules or colloidal particles intertwined into a nanoporous network structure and filled with air [17,18]. Cellulose aerogel spheres have become one of the most studied new aerogel materials [19,20]. Aerogel spheres derived from Salix psammophila (ASSP) present biodegradable, biocompatible, and renewable excellent features, and in the application of high-performance composite materials, they show great potential [21].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Aerogel Spheres Derived from Salix psammophila in Removal of Heavy Metal Ions in Aqueous Solution

Zhong

Wang

et al. 2022

Forests

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Heavy metal wastewater treatment is a huge problem facing human beings, and the application degree of Salix psammophila resources produced by flat stubble is low. Therefore, it is very important to develop high-value products of Salix psammophila resources and apply them in the removal heavy metal from effluent. In this work, we extracted the cellulose from Salix psammophila, and cellulose nanofibers (CNFs) were prepared through TEMPO oxidation/ultrasound. The aerogel spheres derived from Salix psammophila (ASSP) were prepared with the hanging drop method. The experimental results showed that the Cu(II) adsorption capacity of the ASSP composite (267.64 mg/g) doped with TOCNF was significantly higher than that of pure cellulose aerogel spheres (52.75 mg/g). The presence of carboxyl and hydroxyl groups in ASSP enhanced the adsorption capacity of heavy metals. ASSP is an excellent heavy metal adsorbent, and its maximum adsorption values for Cu(II), Mn(II), and Zn(II) were found to be 272.69, 253.25, and 143.00 mg/g, respectively. The abandoned sand shrub resource of SP was used to adsorb heavy metals from effluent, which provides an important reference value for the development of forestry in this sandy area and will have a great application potential in the fields of the adsorption of heavy metals in soil and antibiotics in water.

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Advances on Dimensional Structure Designs and Functional Applications of Aerogels

Cited by 12 publications

References 124 publications

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Robust Silica–Polyimide Aerogel Blanket for Water-Proof and Flame-Retardant Self-Floating Artificial Island

Bioinspired Multilayer Structures for Energy-Free Passive Heating and Thermal Regulation in Cold Environments

Evaluation of Aerogel Spheres Derived from Salix psammophila in Removal of Heavy Metal Ions in Aqueous Solution

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