Microstructural evolution of mullite nanofibrous aerogels with different ice crystal growth inhibitors

Xian, Liang; Zhang, Ying; Wu, Yongjun; Zhang, Xueying; Dong, Xue; Liu, Jiachen; Guo, Anran

doi:10.1016/j.ceramint.2019.09.163

Cited by 23 publications

(7 citation statements)

References 20 publications

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“…With the growth of heating time, the temperature of the back side of the sample gradually increased and only reached 118 °C even after 120 s of continuous heating, which indicates that the material has good high-temperature thermal insulation. Compared with other mullite-based insulation materials reported in other literature studies, such as mullite-based nanofibrous aerogels − and mullite fiber/whisker composite aerogels, − the composite aerogels in our work presented a relatively low thermal conductivity (0.0356 W·m –1 ·K –1 at ambient temperature) and density, as shown in Figure c, indicating the promising applications in high-temperature thermal insulation. Furthermore, we measured the high-temperature thermal conductivity at 1000 °C to be 0.118 W·m –1 ·K –1 .…”

Section: Results and Discussionmentioning

confidence: 48%

Mullite Nanosheet/Titania Nanorod/Silica Composite Aerogels for High-Temperature Thermal Insulation

Ji,

Chen,

Xing

et al. 2023

ACS Appl. Nano Mater.

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Ceramic aerogels play an essential role in the field of high-temperature insulation. However, the significant radiation heat transfer limits the practical applicability. Herein, we have chosen mullite nanosheets prepared successfully by chemical blowing as structural assembly units, modified on the surface of mullite nanosheets with TiO 2 nanorods to reduce infrared radiation heat transfer, and prepared mullite nanosheet/TiO 2 nanorod/silica composite aerogels by adding silica sols as hightemperature binder cast molding in the system. The preferred composite aerogels have good temperature resistance, and the linear shrinkage was measured to be only 2% after calcination at 1500 °C for 30 min and had a low thermal conductivity (0.0356 W•m −1 •K −1 at room temperature and 0.118 W•m −1 •K −1 at 1000 °C). This assembly concept pervades a strategy for developing porous aerogel materials for insulation and protection in extreme environments.

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Section: Results and Discussionmentioning

confidence: 48%

Mullite Nanosheet/Titania Nanorod/Silica Composite Aerogels for High-Temperature Thermal Insulation

Ji,

Chen,

Xing

et al. 2023

ACS Appl. Nano Mater.

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“…(a) Density and corresponding room-temperature thermal conductivity of ZSNFMs and H-ZSNFMs. (b) Statistical diagram of density and corresponding thermal conductivity of various materials. ,,,,− (c) Schematic diagram of the heat insulation test device with a butane spray gun as a heat source. (d) Cold surface temperature curve of time.…”

Section: Resultsmentioning

confidence: 99%

Dual-Phasic, Well-Aligned, and Strong Flexible Hydrophobic Ceramic Membranes for Efficient Thermal Insulation in Extreme Conditions

Peng

Xie

Deng

et al. 2023

ACS Appl. Mater. Interfaces

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The inherent brittleness and hydrophilicity of ceramics pose a great challenge to designing a reliable structure that can resist mechanical loads and moisture in extreme conditions with high temperature and high humidity. Here, we report a two-phase hydrophobic silica–zirconia composite ceramic nanofiber membrane (H-ZSNFM) with exceptional mechanical robustness and high-temperature hydrophobic resistance. For the dual-phasic nanofibers, the amorphous silica blocked the connection of zirconia nanocrystals, and the lattice distortion was observed due to Si in the ZrO2 lattice. H-ZSNFM has strong strength (5–8.4 MPa), high hydrophobic temperature resistance (450 °C), high porosity (89%), low density (40 mg/cm3), low thermal conductivity (30 mW/m·K), and excellent thermal radiation reflectivity (90%). By simulating the actual high-temperature and high-humidity environment, 10-mm-thick H-ZSNFMs can reduce the heat source from 1365 to 380 °C and maintain complete hydrophobicity even in a water vapor environment of 350 °C. This means that it has superior insulation and waterproof performance even in a high-temperature water environment. For firefighting clothing, H-ZSNFM displayed waterproof and insulation layers, which have excellent thermal protection performance and achieve incompatibility between water and fire, providing valuable time for fire rescue and a safety line of defense for emergency personnel. This design strategy with mechanical robust and hydrophobic temperature resistance applies to the development of many other types of high-performance thermal insulation materials and presents a competitive material system for thermal protection in extreme conditions.

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“…Oxide fibers usually have high mechanical strength, low thermal conductivity, good electrical insulation and chemical stability, and can remain stable in the oxygen atmosphere. Some kinds of oxide ceramics such as, silica (SiO 2 ) [1,[10][11][12][13][14][15][16][17][18][19][20], alumina (Al 2 O 3 ) [21][22][23][24][25][26][27][28], zirconia (ZrO 2 ) [2,5,[29][30][31][32][33], titania (TiO 2 ) [2,[34][35][36][37][38][39][40][41][42][43], zinc oxide (ZnO) [17,39,[44][45][46][47], mullite [48][49][50][51][52]…”

Section: Materials For Preparation Of Fcfsmentioning

confidence: 99%

Flexible Ceramic Fibers: Recent Development in Preparation and Application

Jia

Luo

et al. 2022

Adv. Fiber Mater.

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Flexible ceramic fibers (FCFs) have been developed for various advanced applications due to their superior mechanical flexibility, high temperature resistance, and excellent chemical stability. In this article, we present an overview on the recent progress of FCFs in terms of materials, fabrication methods, and applications. We begin with a brief introduction to FCFs and the materials for preparation of FCFs. After that, various methods for preparation of FCFs are discussed, including centrifugal spinning, electrospinning, solution blow spinning, self-assembly, chemical vapor deposition, atomic layer deposition, and polymer conversion. Recent applications of FCFs in various fields are further illustrated in detail, including thermal insulation, air filtration, water treatment, sound absorption, electromagnetic wave absorption, battery separator, catalytic application, among others. Finally, some perspectives on the future directions and opportunities for the preparation and application of FCFs are highlighted. We envision that this review will provide readers with some meaningful guidance on the preparation of FCFs and inspire them to explore more potential applications.

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Microstructural evolution of mullite nanofibrous aerogels with different ice crystal growth inhibitors

Cited by 23 publications

References 20 publications

Mullite Nanosheet/Titania Nanorod/Silica Composite Aerogels for High-Temperature Thermal Insulation

Mullite Nanosheet/Titania Nanorod/Silica Composite Aerogels for High-Temperature Thermal Insulation

Dual-Phasic, Well-Aligned, and Strong Flexible Hydrophobic Ceramic Membranes for Efficient Thermal Insulation in Extreme Conditions

Flexible Ceramic Fibers: Recent Development in Preparation and Application

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