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

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(13)

Published: Dec. 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.

Language: Английский

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Solar‐Powered Interfacial Evaporation and Deicing Based on a 3D‐Printed Multiscale Hierarchical Design

Small, Journal Year: 2023, Volume and Issue: 19(33)

Published: April 22, 2023

Abstract Solar‐powered interfacial heating has emerged as a sustainable technology for hybrid applications with minimal carbon footprints. Aerogels, hydrogels, and sponges/foams are the main building blocks state‐of‐the‐art photothermal materials. However, these conventional three‐dimensional (3D) structures related fabrication technologies intrinsically fail to maximize important performance‐enhancing strategies this still faces several performance roadblocks. Herein, monolithic, self‐standing, durable aerogel matrices developed based on composite inks ink‐extrusion 3D printing, delivering all‐in‐one steam generators (SGs). Rapid prototyping of multiscale hierarchical synergistically reduce energy demand evaporation, expand actual evaporation areas, generate massive environmental input, improve mass flows. Under 1 sun, high water rates 3.74 kg m −2 h −1 in calm air 25.3 at gentle breeze 2 s achieved, ranking among best‐performing solar‐powered SGs. 3D‐printed microchannels hydrophobic modification deliver an icephobic surface aerogels, leading self‐propelled rapid removal ice droplets. This work shines light rational materials, not merely breaking through constraints clean production, but also discovering new functions deicing.

Language: Английский

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Fire-resistant and thermal-insulating alginate aerogel with intelligent bionic armor for exceptional mechanical and fire early-warning performance

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 498, P. 155181 - 155181

Published: Aug. 25, 2024

Language: Английский

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In Situ Ceramization of Nanoscale Interface Enables Aerogel with Thermal Protection at 1950 °C

ACS Nano, Journal Year: 2024, Volume and Issue: 18(4), P. 3520 - 3530

Published: Jan. 17, 2024

Conventional carbon fiber felt-reinforced aerogel composites are often used as lightweight thermal protection systems (TPSs) for aerospace craft. However, due to their poor oxidation resistance, they have gradually failed handle increasingly harsh environments. In this work, a nanoscale composite coating interface of SiC-ZrC ceramic precursor is first constructed on the surface. Subsequently, using coated felt three-dimensional skeleton and through polymerization-induced phase separation, an with excellent in extreme environments prepared. Owing situ ceramization at ultrahigh temperatures, back temperature 12 mm thick only 147 °C after exposure oxyacetylene flame 1950 70 s. Meanwhile, central region recedes by 7%. Not does work provide way enhance aerogels constructing self-ceramizable it also expected that developed can be applied ultrahigh-temperature future

Language: Английский

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Lightweight and robust cellulose/MXene/polyurethane composite aerogels as personal protective wearable devices for electromagnetic interference shielding

International Journal of Biological Macromolecules, Journal Year: 2024, Volume and Issue: 271, P. 132435 - 132435

Published: May 16, 2024

Language: Английский

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