Ultralight and hydrophobic MXene/chitosan-derived hybrid carbon aerogel with hierarchical pore structure for durable electromagnetic interference shielding and thermal insulation

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 446, P. 137093 - 137093

Published: May 24, 2022

Language: Английский

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Water-Induced Self-Assembly and In Situ Mineralization within Plant Phenolic Glycol-Gel toward Ultrastrong and Multifunctional Thermal Insulating Aerogels

ACS Nano, Journal Year: 2022, Volume and Issue: 16(6), P. 9062 - 9076

Published: June 2, 2022

Biopolymer/silica nanocomposite aerogels are highly attractive as thermally insulating materials for prevailing energy-saving engineering but usually plagued by their lack of mechanical strength and environmental stability. Lignin is an appealing plant phenolic biopolymer due to its natural abundance, high stiffness, water repellency, thermostability. However, integrating lignin silica into high-performance 3D hybrid remains a substantial challenge the unstable co-sol process. In diatoms, silicic acid stabilization prior condensation reaction enhanced intervention biomolecules in noncovalent interactions. Inspired this mechanism, we herein rationally design ultrastrong silica-mineralized aerogel (LigSi) with adjustable multilevel micro/nanostructure arbitrary machinability through unusual water-induced self-assembly situ mineralization based on ethylene glycol-stabilized lignin/siloxane colloid. The optimized LigSi exhibits ultrahigh stiffness (a specific modulus ∼376.3 kN m kg–1) can support over 5000 times own weight without obvious deformation. Moreover, demonstrates combination outstanding properties, including superior humidity-tolerant thermal insulation (maintained at ∼0.04 W m–1 K–1 under relative humidity 33–94%), excellent fire resistance withstanding ∼1200 °C flame disintegration, low near-infrared absorption (∼9%), intrinsic self-cleaning/superhydrophobic performance (158° WCA). These advanced properties make it ideal material diversified applications harsh environments. As proof concept, dual-mode device was designed demonstrate application prospect combining passive heat-trapping active heating building.

Language: Английский

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Recent developments in biomass derived cellulose aerogel materials for thermal insulation application: a review

Cellulose, Journal Year: 2022, Volume and Issue: 29(9), P. 4805 - 4833

Published: May 3, 2022

Language: Английский

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Nacre‐Mimetic Nanocomposite Aerogels with Exceptional Mechanical Performance for Thermal Superinsulation at Extreme Conditions

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(29)

Published: April 21, 2023

Abstract Thermal protection under extreme conditions requires materials with excellent thermal insulation properties and exceptional mechanical to withstand a variety of complex external stresses. Mesoporous silica aerogels are the most widely used due their ultralow conductivity. However, they still suffer from fragility structural instability in practical applications. Herein, nacre‐mimetic nanocomposite aerogel, synthesized via situ growth inorganic minerals lamellar cellulose nanofibrous network, is reported. The multiscale adaptation inorganic–organic components endows rapid configuration recovery during ambient pressure drying. resulting show conductivities (17.4 mW m −1 K at 1.0 atm). These also integrate challenging properties, including high compressive stiffness resist deformation an adult, superelasticity prevent static dynamic stress cracking even crushing vehicle (1.6 t), bending flexibility adapt any surface. Moreover, exhibit stability fatigue stress/strain cycles over wide temperature range (−196 200 °C). combination performance offers potential material system for robust superinsulation conditions, especially aerospace

Language: Английский

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Tough, Highly Oriented, Super Thermal Insulating Regenerated All-Cellulose Sponge-Aerogel Fibers Integrating a Graded Aligned Nanostructure

Nano Letters, Journal Year: 2022, Volume and Issue: 22(9), P. 3516 - 3524

Published: April 1, 2022

Thermal insulating fibers can effectively regulate the human body temperature and decrease indoor energy consumption. However, designing super thermal integrating a sponge aerogel structure based on biomass resources is still challenge. Herein, flow-assisted dynamic dual-cross-linking strategy developed to realize steady fabrication of regenerated all-cellulose graded sponge–aerogel (CGFs) in microfluidic chip. The chemically cross-linked cellulose solution used as core flow, which passed through two sheath flow channels, containing either diffusion solvent or physical cross-linking solvent, resulting CGFs with porous outer layer dense inner layer. By regulating simulating process chip, adjustable thicknesses, excellent toughness (26.20 MJ m–3), ultralow conductivity (0.023 W m–1 K–1) are fabricated. This work provides new method for fabricating inspires attractive applications insulation textiles.

Language: Английский

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Insights into Hierarchical Structure–Property–Application Relationships of Advanced Bacterial Cellulose Materials

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(12)

Published: Jan. 19, 2023

Abstract Bacterial cellulose (BC) is an environmentally friendly biomaterial that widely investigated because it possesses a unique hierarchical nanofiber network structure as well extraordinary performance. In this review, the formation of BC from perspective biosynthesis illustrated based on its basic chemical and crystal structure. Moreover, design processing BC‐based advanced materials through biosynthesis, physical, and/or modification are also reviewed. The intrinsic characteristics BC, derived structure, analyzed to understand structure–property–application relationships. applications reviewed, such high‐strength structural utilizing properties nanofibers, energy conversion storage, bioelectronic interfaces, environmental remediation, thermal management ion transport 3D structures these materials. addition, authors offer their opinions potential future research directions for sustainably developing

Language: Английский

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Superelastic and Ultralight Aerogel Assembled from Hemp Microfibers

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(22)

Published: March 14, 2023

Abstract Aerogels with both high elastic strain and fast shape recovery after compression have broad application potentials as thermal regulation, absorbents, electrical devices. However, creating such aerogels from cellulosic materials requires complicated preparation processes. Herein, a simple strategy for scalable production of hemp microfibers using top‐down method is reported, which can further be assembled into interconnected porous structures via ice‐templating technique. With density low 2.1 mg cm −3 , these demonstrate isotropic superelasticity, exhibited by their restoration over 80% compressive strain. Due to the porosity (99.87%) structural tortuosity, show conductivity 0.0215 ± 0.0002 W m −1 K suggesting potential in insulation application. Certain hydrophobic modification silane derivative endows reduced water affinity. Overall, proposed prepare bio‐based technology, well aerogels, provides new insights design fabrication multifunctional value‐added applications.

Language: Английский

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High-strength, thermal-insulating, fire-safe bio-based organic lightweight aerogel based on 3D network construction of natural tubular fibers

Composites Part B Engineering, Journal Year: 2023, Volume and Issue: 261, P. 110809 - 110809

Published: May 17, 2023

Language: Английский

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Full Bio-Based Aerogel Incorporating Lignin for Excellent Flame Retardancy, Mechanical Resistance, and Thermal Insulation

ACS Sustainable Chemistry & Engineering, Journal Year: 2023, Volume and Issue: 11(11), P. 4473 - 4484

Published: March 9, 2023

Aerogels have drawn a lot of interest as prospective insulation materials in the construction industry due to their low thermal conductivity. However, combination excellent mechanical properties and flame retardancy is fundamental issue with majority bio-based aerogels. By utilizing ability alginate solution gel mildly acidic environments, sodium (SA)/sodium lignosulfonate (LS)/phytic acid (PA) aerogels were fabricated quick facile method. To solve inorganic additives being incompatible substrate, we introduced lignin it structural reinforcer char-forming agent, significantly improving strengths aerogels, which has increased compressive modulus by nearly 30 times. The inclusion dramatically boosted suppress smoke while simultaneously reducing its fire index then providing outstanding resistance. A superhydrophobic flame-retardant aerogel water contact angle 150° was obtained chemical vapor deposition methyltrichlorosilane (MTCS), further broadening application potential. This work offers fresh idea for high-value utilization lignin, enormous potential fields transportation.

Language: Английский

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Superelastic Carbon Aerogels: An Emerging Material for Advanced Thermal Protection in Extreme Environments

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(26)

Published: March 25, 2023

Abstract Carbon aerogels (CAs) are desirable for thermal protection in aerospace because of their lightweight and high‐temperature insulation characteristic; however, intrinsic brittleness flaw sensitivity easily trigger catastrophic failure when resisting high‐frequency shocks or complex mechanical stresses. Compression is the predominant load applied on by aerodynamic pressure pre‐tightening force; therefore, structural elasticity exceptional capability to keep performance under impact stress crucial deciding actual availability aerogels. This review presents recent progress newly resilient CAs protection, focusing reliable stability, superinsulation property. The influence law microstructures heat transfer behaviors first investigated, followed construction strategies adiabatic CAs, emphasizing recoverable deformability resulting from increased continuity building blocks 0D nanoparticles 1D nanofibers/nanotubes then 2D nanosheets. Moreover, optimization stability aerobic environments discussed. Finally, it raises current challenges further opportunities toward better properties brighter prospects.

Language: Английский

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