A Regulable Polyporous Graphite/Melamine Foam for Heat Conduction, Sound Absorption and Electromagnetic Wave Absorption

Small, Journal Year: 2023, Volume and Issue: 20(11)

Published: Nov. 5, 2023

Abstract To reduce electromagnetic interference and noise pollution within communication base stations servers, it is necessary for wave absorption (EWA) materials to transition from coating multifunctional devices. Up now, the stable effective integration of multiple functions into one material by a simple method has remained large challenge. Herein, foam‐type microwave device assembled with multicomponent organic matter graphite powder synthesized universal combination process. Melamine phenolic aldehyde amine work as skeleton cementing compound, respectively, in which embedded compound interconnected mesoscopic 3D electric conductive heat network. Interestingly, prepared flexible graphite/melamine foam (CMF) delivers great EWA performance, bandwidth 9.8 GHz, ultrathin thickness 2.60 mm, strong reflection loss −41.7 dB. Moreover, CMF possesses porosity flexibility, endowing sound ability. The unique its EWA, conduction, absorption, mechanical robustness, well cost‐effective scalable manufacturing. These attributes make promising widely used stations, chips protection.

Language: Английский

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Recent progress in natural fiber reinforced composite as sound absorber material

Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 84, P. 108514 - 108514

Published: Jan. 19, 2024

In today's modern society, an emerging field that has garnered notable attention pertains to the management of sound. Effective control measures are needed because increase in noise pollution from urbanization and industrial growth. Effectively regulating level across all areas engineering is imperative. The development acoustic materials with exceptional absorption efficiency a frontier area study for acousticians architects alike industry. This material scientists owing multiple noteworthy characteristic properties it offers. Sound commonly consist conventional chemical synthetic constituents require replacement various justifiable reasons, so substitution these natural very important. employment sustainable, cost-effective, recyclable, reproducible instead plays crucial role addressing myriad environmental concerns. These concerns include, but not limited to, increasing greenhouse gas emissions (CO2 levels), potential health risks, air ecosystems, temperature (global warming), reduction fossil fuels raw materials, attainment ecologically sound cities. main purpose this review draw most promising fibers. Thus, focus will primarily be on current trends fibers, recycled fibers agricultural wastes. Today, popular also drive future directions, particularly by providing next generation researchers considerable opportunities.

Language: Английский

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“Bottom-up” and “top-down” strategies toward strong cellulose-based materials

Chemical Society Reviews, Journal Year: 2024, Volume and Issue: 53(18), P. 9306 - 9343

Published: Jan. 1, 2024

Cellulose, as the most abundant natural polymer on Earth, has long captured researchers' attention due to its high strength and modulus. Nevertheless, transferring exceptional mechanical properties macroscopic 2D 3D materials poses numerous challenges. This review provides an overview of research progress in development strong cellulose-based using both "bottom-up" "top-down" approaches. In strategy, various forms regenerated nanocellulose-based high-strength assembled by different methods are discussed. Under approach, focus is reinforced derived from wood, bamboo, rattan straw. Furthermore, a brief potential applications fordifferent types given, followed concise discussion future directions.

Language: Английский

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Fire‐Safe Aerogels and Foams for Thermal Insulation: From Materials to Properties

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 19, 2024

The ambition of human beings to create a comfortable environment for work and life in sustainable way has triggered great need advanced thermal insulation materials past decades. Aerogels foams present prospects as insulators owing their low density, good insulation, mechanical robustness, even high fire resistance. These merits make them suitable many real-world applications, such energy-saving building materials, thermally protective aircrafts battery, warming fabrics. Despite advances, date there remains lack comprehensive yet critical review on the materials. Herein, recent progresses fire-safe thermal-insulating aerogels are summarized, pros/cons three major categories aerogels/foams (inorganic, organic hybrids) discussed. Finally, key challenges associated with existing discussed some future opportunities proposed. This is expected expedite development insulating help sustainable, safe, energy-efficient society.

Language: Английский

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Lightweight and Mechanically Robust Cellulosic Triboelectric Materials for Wearable Self-Powered Rehabilitation Training

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 2, 2025

Lightweight and robust self-powered wearable devices are of great importance in rehabilitation medical assistance, but this places greater demands on the development functional materials. In particular, a balance between reducing weight materials enhancing their mechanical performance is urgently needed. Here, study reports design strategy based cross-scale strengthening mechanism, which endows triboelectric with mechanically properties, can withstand more than 16,600 times its without any deformation. A biomimetic ordered network structure "wall-septum" obtained by using directional ice templating method, followed formation hydrogen bonds polymer molecular chains promoted salting-out. The resultant material exhibits Young's modulus 130.3 MPa, specific 409.0 kN m/kg. Triboelectric used to construct highly nanogenerators that stable even under an impact 735.5 kPa. accurate acquisition human motion state signal process training realized. This provides universal for lightweight solution application training.

Language: Английский

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Investigation on microperforated sandwich structures with light weight and broadband sound absorption: Influences of foam filling and core configurations

Journal of Sandwich Structures & Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 24, 2025

Structures with light weight and broadband sound absorption is of vital importance for noise control applications in engineering practice. Foams exhibit but poor low frequency absorption, micro-perforated sandwich structures conversely possess good at frequencies due to resonance, the bandwidth however limited. Micro-perforated foam filling are therefore proposed paper obtain wideband low-frequency absorption. An integrated analytical, numerical experimental research conducted investigate lightweight characteristics four commonly used honeycomb (PHSP), corrugated (PCSP), N hybrid (PNHSP) honeycomb-corrugated (PHCSP) cores. analytical model built estimate coefficient (SAC) based on acoustic impedance theory Johnson-Champoux-Allard model. Numerical simulation measurement methods simultaneously validate The influences underling mechanism configurations explored, it found that melamine can enhance structures, half-filled bring higher peak values than fully filled more violent resonance. To overall evaluate both performance varied cores, a comprehensive evaluation index by relative mass developed. Results show PCSPs lower half part perform best among all structures. this provide guidance application

Language: Английский

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High-performance and anti-leakage polypyrrole-modified wood-based composite phase change material with superior photothermal conversion capability

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 113, P. 115696 - 115696

Published: Feb. 6, 2025

Language: Английский

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Diatom-Inspired Nanoscale Heterogeneous Assembly Strategy for Constructing Thermal Insulating Wood-Based Aerogels with Exceptional Strength, Resilience, Degradability, and Flame Retardancy

ACS Nano, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

The potential of thermally insulated wood aerogels in energy-efficient engineering is constrained by their mechanical weakness and inadequate environmental stability. Combining minerals with offers promise for enhancing multifaceted performance. However, fabricating high-performance wood-based via organic–inorganic assembly remains challenging due to poor uniformity weak interfacial bonding. Herein, inspired diatoms, an ultrastrong flame-retardant biomimetic polymethylsilsesquioxane–wood aerogel (MSQW) fabricated combining a nanoscale heterogeneous strategy sol–gel process precisely engineer each level the hierarchy. Meanwhile, situ mineralization amorphous inorganic oligomers firmly welds interface, forming continuous homogeneous monolithic structure. resulting MSQW exhibits ultrahigh stiffness axial direction (Young's modulus 68.73 ± 3.20 MPa) withstands over 60% strain at 6.97 MPa radial direction, recovering its original shape after stress release, unique structural features. Additionally, excellent combination properties, including outstanding fire resistance ( peak heat release rate 91.13 kW/m2), hydrophobicity (water contact angle 137.3°), degradability. These advanced properties make ideal material thermal insulation harsh environments.

Language: Английский

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Flexible and Transformable Ceramic Aerogels via a Fire‐Reborn Strategy for Thermal Superinsulation in Extreme Conditions

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(52)

Published: Sept. 13, 2023

Abstract Effective thermal superinsulation in extremely high temperatures (EHT) is crucial for aerospace, industrial, and civilization activities. However, current strategies relying on ceramic materials face limitations due to their conductivity brittleness specific conditions. In this study, a feasible scalable method synthesizing flexible, lightweight, transformable fire‐reborn silica‐alumina hybrid aerogel (FR‐SACA) presented, which achieved by rearranging silica microparticles Al 2 O 3 fibers using self‐sacrifice polymer, resulting bio‐inspired bird nest structured FR‐SACA. The SACA exhibits exceptional properties, including an ultra‐low density of 0.01 g cm −3 , low 0.029 W m −1 K reversible compression up 80%. Notably, 20 mm‐thick FR‐SACA demonstrates remarkable temperature reduction 1179.6 °C when exposed directly 1300 flame, suggesting its potential as material EHT environments. Furthermore, the transformability enables situ fabrication surfaces with diverse heteromorphic structures, such flat, bent, angled shapes, thereby providing various constructions. Phoenix Nirvana process opens new possibilities aerogels desirable flexibility adaptive facilitating effective management under extreme

Language: Английский

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Sustainable Wood-Waste-Based Thermal Insulation Foam for Building Energy Efficiency

Buildings, Journal Year: 2023, Volume and Issue: 13(4), P. 840 - 840

Published: March 23, 2023

Wood is one of the most abundant biomaterials on Earth, which has been used for centuries in construction applications including furniture, roofing, flooring, and cabinetry. However, wood chips—which are a low-quality plentiful waste byproduct lumber milling, woodworking, shipping operations—have low economic value complicated disposal methods. In this paper, we propose strategy chip reuse through fabrication bio-based building insulation foam. Through high-temperature chemical treatment delignification process, introduced additional small pores within chips, effectively lowering their thermal conductivity, them combination with binding agent to produce porous The foam achieved conductivity 0.038 W/(m·K) high compressive strength 1.1 MPa (70% strain). These characteristics demonstrate that can be repurposed into an effective material, addressing challenges both management sustainable construction.

Language: Английский

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