Reaction-Spun Transparent Silica Aerogel Fibers

Du, Yu; Zhang, Xiaohua; Wang, Jin; Liu, Zengwei; Zhang, Kun; Ji, Xiaofei; You, Ye‐Zi; Zhang, Xuetong

doi:10.1021/acsnano.0c05016

Cited by 136 publications

(119 citation statements)

References 53 publications

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“…However, when the bare PI foam was placed on the hot plate, the temperature of the foam surface was 94 • C, which is lower than that of the temperature of the hot plate. It can be seen that aerogel blankets exhibited better thermal insulation capacity than PI foam when compared to pure silica aerogels (Du et al, 2020; Figure 5I). The thermal stability of the silica-PI aerogel blankets was also similar to that of the PI foam, where the decomposition temperature of the blanket and foam at 5% was ca.…”

Section: Resultsmentioning

confidence: 97%

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: Resultsmentioning

confidence: 97%

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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“…However, we cannot identify the clear mesopore structure in TEM images, which have also been well documented in other studies (Figure S1 , Supporting Information). [ 22 , 23 ]…”

Section: Resultsmentioning

confidence: 99%

Mesopore Controls the Responses of Blood Clot‐Immune Complex via Modulating Fibrin Network

Shan

Xie

et al. 2021

Advanced Science

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Formation of blood clots, particularly the fibrin network and fibrin network‐mediated early inflammatory responses, plays a critical role in determining the eventual tissue repair or regeneration following an injury. Owing to the potential role of fibrin network in mediating clot‐immune responses, it is of great importance to determine whether clot‐immune responses can be regulated via modulating the parameters of fibrin network. Since the diameter of D‐terminal of a fibrinogen molecule is 9 nm, four different pore sizes (2, 8, 14, and 20 nm) are rationally selected to design mesoporous silica to control the fibrinogen adsorption and modulate the subsequent fibrin formation process. The fiber becomes thinner and the contact area with macrophages decreases when the pore diameters of mesoporous silica are greater than 9 nm. Importantly, these thinner fibers grown in pores with diameters larger than 9 nm inhibit the M1‐polorazation of macrophages and reduce the productions of pro‐inflammatory cytokines and chemokines by macrophages. These thinner fibers reduce inflammation of macrophages through a potential signaling pathway of cell adhesion‐cytoskeleton assembly‐inflammatory responses. Thus, the successful regulation of the clot‐immune responses via tuning of the mesoporous pore sizes indicates the feasibility of developing advanced clot‐immune regulatory materials.

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“…The raw materials of the aerogel fibers are typically synthetic polymers [ 33 ], natural polymers [ 34 ], graphene oxide [ 35 ], or their composites [ 36 ]. Although some studies have reported on inorganic oxide (e.g., SiO 2 ) aerogels, their tensile strength generally does not exceed 0.5 MPa [ 27 , 37 ], which is much lower than that of the previously mentioned fibrous aerogels. This is because there are significant differences between their microstructures.…”

Section: Introductionmentioning

confidence: 99%

Robust Silica-Bacterial Cellulose Composite Aerogel Fibers for Thermal Insulation Textile

Sai

Wang

Miao

et al. 2021

Gels

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Aerogels are nanoporous materials with excellent properties, especially super thermal insulation. However, owing to their serious high brittleness, the macroscopic forms of aerogels are not sufficiently rich for the application in some fields, such as thermal insulation clothing fabric. Recently, freeze spinning and wet spinning have been attempted for the synthesis of aerogel fibers. In this study, robust fibrous silica-bacterial cellulose (BC) composite aerogels with high performance were synthesized in a novel way. Silica sol was diffused into a fiber-like matrix, which was obtained by cutting the BC hydrogel and followed by secondary shaping to form a composite wet gel fiber with a nanoscale interpenetrating network structure. The tensile strength of the resulting aerogel fibers reached up to 5.4 MPa because the quantity of BC nanofibers in the unit volume of the matrix was improved significantly by the secondary shaping process. In addition, the composite aerogel fibers had a high specific area (up to 606.9 m2/g), low density (less than 0.164 g/cm3), and outstanding hydrophobicity. Most notably, they exhibited excellent thermal insulation performance in high-temperature (210 °C) or low-temperature (−72 °C) environments. Moreover, the thermal stability of CAFs (decomposition temperature was about 330 °C) was higher than that of natural polymer fiber. A novel method was proposed herein to prepare aerogel fibers with excellent performance to meet the requirements of wearable applications.

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Reaction-Spun Transparent Silica Aerogel Fibers

Cited by 136 publications

References 53 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

Mesopore Controls the Responses of Blood Clot‐Immune Complex via Modulating Fibrin Network

Robust Silica-Bacterial Cellulose Composite Aerogel Fibers for Thermal Insulation Textile

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