Biomimetic, knittable aerogel fiber for thermal insulation textile

Science, Год журнала: 2023, Номер 382(6677), С. 1379 - 1383

Опубликована: Дек. 21, 2023

Aerogels have been considered as an ideal material for thermal insulation. Unfortunately, their application in textiles is greatly limited by fragility and poor processability. We overcame these issues encapsulating the aerogel fiber with a stretchable layer, mimicking core-shell structure of polar bear hair. Despite its high internal porosity over 90%, our up to 1000% strain, which improved compared that traditional fibers (~2% strain). In addition washability dyeability, mechanically robust, retaining stable insulation property after 10,000 stretching cycles (100% A sweater knitted was only one-fifth thick down, similar performance. Our strategy this provides rich possibilities developing multifunctional textiles.

Язык: Английский

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One‐Hour Ambient‐Pressure‐Dried, Scalable, Stretchable MXene/Polyurea Aerogel Enables Synergistic Defense Against High‐Frequency Mechanical Shock and Electromagnetic Waves

Advanced Functional Materials, Год журнала: 2024, Номер 34(38)

Опубликована: Апрель 5, 2024

Abstract The rapid, energy‐efficient, scalable preparation of high‐strength, flexible, multifunctional nanostructured aerogels is highly desired yet challenging. Here, an ambient‐pressure‐dried (APD) strategy developed involving self‐foaming, dip‐coating, and graphene oxide (GO)‐assisted multiple cross‐linking treatments for the prompt, large‐area polyurea/transition metal carbides/nitrides (MXenes) aerogels. APD MXene‐based showcase low density, remarkable mechanical strength, ultraflexiblity stretchability, good conductivity, hydrophobicity, high resistance to various solvents. Synergies robust, elastic cell walls porous structure contribute high‐efficiency absorption high‐frequency, high‐speed shock waves aerogels, significantly transcendinging biomasses, plastics, elastomers, ceramics, metals. In addition excellent microwave shielding performance over 40 dB in ultrabroadband frequencies 4–40 GHz, oxidation stability elevated MXene consequently yielding applicability harsh conditions. Furthermore, superior light capability leads efficient photothermal conversion, therapy, antibacterial, desalination, water purification, deicing, thick oil absorption. This work provides a facile, time‐ methodology manufacturing large‐area, ultraflexible, enlighting novel synergistic defense against electromagnetic waves, promoting them as prospective candidate aerospace, device protection, next‐generation electronics.

Язык: Английский

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Direct Synthesis of Polyimide Curly Nanofibrous Aerogels for High‐Performance Thermal Insulation Under Extreme Temperature

Advanced Materials, Год журнала: 2023, Номер 36(13)

Опубликована: Дек. 20, 2023

Abstract Maintaining human body temperature is one of the basic needs for living, which requires high‐performance thermal insulation materials to prevent heat exchange with external environment. However, most widely used fibrous always suffer from heavy weight, weak mechanical property, and moderate capacity suppress transfer, resulting in limited personal cold protection performance. Here, an ultralight, mechanically robust, thermally insulating polyimide (PI) aerogel directly synthesized via constructing 3D interlocked curly nanofibrous networks during electrospinning. Controlling solution/water molecule interaction enables rapid phase inversion charged jets, while multiple jets are ejected by regulating charge density fluids, thus synergistically allowing numerous nanofibers interlock cross‐link each other form porous structure. The resulted PI integrates ultralight property 2.4 mg cm −3 , extreme tolerance (mechanical robustness over −196 300 °C), performance ultralow conductivity 22.4 mW m −1 K providing ideal candidate keep comfort under temperature. This work can provide a source inspiration design development aerogels various applications.

Язык: Английский

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Multiscale Interpenetrated/Interconnected Network Design Confers All‐Carbon Aerogels with Unprecedented Thermomechanical Properties for Thermal Insulation under Extreme Environments

Advanced Materials, Год журнала: 2023, Номер 36(7)

Опубликована: Ноя. 2, 2023

With ultralight weight, low thermal conductivity, and extraordinary high-temperature resistance, carbon aerogels hold tremendous potential against severe threats encountered by hypersonic vehicles during the in-orbit operation re-entry process. However, current 3D are plagued irreconcilable contradictions between adiabatic mechanical performance due to monotonicity of building blocks or uncontrollable assembly behavior. Herein, a spatially confined strategy multiscale low-dimensional nanocarbons is reported decouple stress heat transfer. The nanofiber framework, basis for transferring loading strain, covered continuous thin-film-like layer formed aggregation nanoparticles, which in combination serve as fundamental structural units generating an elastic behavior while yielding compartments suppress gaseous fluid diffusion within distinct partitions. resulting all-carbon with hierarchical cellular structure quasi-closed cell walls achieve best thermomechanical insulation trade-off, exhibiting flyweight density (24 mg cm

Язык: Английский

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Guidelines derived from biomineralized tissues for design and construction of high-performance biomimetic materials: from weak to strong

Chemical Society Reviews, Год журнала: 2024, Номер 53(9), С. 4490 - 4606

Опубликована: Янв. 1, 2024

This review discusses recent advances, challenges, future research directions and perspectives in biomineralized tissues, providing in-depth insights into derived guidelines for design preparation of high-performance biomimetic materials.

Язык: Английский

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

Small, Год журнала: 2024, Номер 20(44)

Опубликована: Июль 2, 2024

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

Язык: Английский

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Tuning the Multilevel Hierarchical Microarchitecture of MXene/rGO‐Based Aerogels Through a Magnetic Field‐Guided Strategy Toward Stepwise Enhanced Electromagnetic Wave Dissipation

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Июнь 5, 2024

Abstract Hierarchical microarchitecture engineering is a state‐of‐the‐art approach to designing aerogel electromagnetic (EM) wave absorbers, offering huge potential in improving EM energy dissipation. However, the intrinsic feedback mechanism regarding specific influence of each parameter on properties not comprehensively revealed, making it challenging fully utilize aerogels achieve superior absorption performance. Herein, range MXene/rGO‐based with multilevel hierarchical configurations are fabricated by magnetic field‐guided strategy. Leveraging growth thermodynamics effects under field and bridging effect between adjacent rGO units, three models (lamellae ordering, interlayer spacing, layer thickness) constructed aerogels. Remarkably, progressively improve reflection loss ( RL ), effective bandwidth (EAB), matching thickness enhancing dielectric loss, decoupling attenuation‐impedance matching, adjusting power density, respectively. Consequently, exhibit stepwise enhancement performance, achieving −64.6 dB broad EAB 7.0 GHz at 1.8 mm thickness, surpassing alternative other configurations. This work elucidates synergistic multi‐effect dissipation waves aerogels, providing insights for advanced absorbers through diverse strategies.

Язык: Английский

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Elastic SiC Aerogel for Thermal Insulation: A Systematic Review

Small, Год журнала: 2024, Номер 20(32)

Опубликована: Март 21, 2024

Abstract SiC aerogels with their lightweight nature and exceptional thermal insulation properties have emerged as the most ideal materials for protection in hypersonic vehicles; However, conventional are prone to brittleness mechanical degradation when exposed complex loads such shock vibration. Hence, preserving structural integrity of under combined influence external forces is crucial not only stabling performance but also determining practicality harsh environments. This review focuses on optimization design based structure‐performance aerogels, providing a comprehensive inherent correlations among stability, properties, performance. First, transfer mechanism from microstructural perspective studied, followed by relationship between building blocks (0D particles, 1D nanowires/nanofibers) compression (including compressive resilience, strength, fatigue resistance). Moreover, strategy improve high‐temperature oxidation resistance explored. Lastly, challenges future breakthrough directions presented.

Язык: Английский

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Synchronous Radiative Cooling and Thermal Insulation in SiO₂/Poly(vinyl alcohol) Composite Aerogel for Energy Savings in Building Thermal Management

ACS Sustainable Chemistry & Engineering, Год журнала: 2024, Номер 12(14), С. 5695 - 5704

Опубликована: Март 27, 2024

Daytime passive radiative cooling is an effective way to reduce energy consumption for building cooling. However, overcooling might occur in at low-temperature which presents limitations thermal management. Herein, a new SiO2/poly(vinyl alcohol) composite aerogel with nanomicro–multistage porous structure insulation and was fabricated by non-solvent-assisted freeze-drying strategy. In the fabrication process, nonsolvent (acetone) poly(vinyl utilized control proportion size of macro-porous inside aerogel, making conductivity decreased 0.0390 W/mK while spontaneously increasing its solar reflectance infrared (8–13 μm) emissivity 93.70% 98.19%, respectively. The achieved sub-ambient up 14.1 °C during day above-ambient warming 3.8 night, avoiding nighttime overcooling. demonstrates adaptive management compared commercial materials, it suitable intelligent energy-saving buildings.

Язык: Английский

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Customizing temperature-resistant cellulosic triboelectric materials for energy harvesting and emerging applications

Nano Energy, Год журнала: 2024, Номер 124, С. 109449 - 109449

Опубликована: Март 6, 2024

Язык: Английский

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