Cation Bimetallic MOF Anchored Carbon Fiber for Highly Efficient Microwave Absorption

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

Опубликована: Март 19, 2024

Abstract Carbon fiber (CF) is a potential microwave absorption (MA) material due to the strong dielectric loss. Nevertheless, owing high conductivity, poor impedance matching of carbon‐based materials results in limited MA performance. How solve this problem and achieve excellent performance remains principal challenge. Herein, taking full advantage CF bimetallic metal–organic frameworks (MOF) derivatives layer, an absorber based on micron‐scale 1D NiCoMOF (CF@NiCoMOF‐800) developed. After adjusting oxygen vacancies MOF, resultant presented properties including minimum reflection loss (RL min ) −80.63 dB wide effective bandwidth (EAB) 8.01 GHz when its mass percent only 5 wt.% thickness 2.59 mm. Simultaneously, mechanical epoxy resin (EP)‐based coating with are effectively improved. The hardness (H), elastic modulus (E), bending strength, compressive strength CF@NiCoMOF‐800/EP 334 MPa, 5.56 GPa, 82.2 135.8 which 38%, 15%, 106% 53% higher than EP coating. This work provides promising solution for carbon achieving properties.

Язык: Английский

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A numerical modeling of battery thermal management system using nano-enhanced phase change material in hot climate conditions

Case Studies in Thermal Engineering, Год журнала: 2024, Номер 58, С. 104372 - 104372

Опубликована: Апрель 7, 2024

Battery thermal management system (BTMS) is of utmost importance to ensure their safe and efficient operation. In regions with hot climates, such as Saudi Arabia, batteries are particularly susceptible overheating, leading performance degradation, safety risks, potential fires. Traditional phase change materials (PCMs) have limitations in terms slow response times limited conductivity. To overcome these challenges, nano-enhanced PCMs (NePCMs) been developed, incorporating nanoparticles into the PCM matrix enhance properties. This study focused on application NePCM, specifically RT44 SWCNT, for BTMS a pouch battery climates. The investigation primarily centered exploring effects NePCM chamber thicknesses at top bottom. It was expected that increasing thickness would effectively regulate temperature. However, revealed had impact temperature due dominant influence ambient environment. summary, results this indicate optimal design configuration chamber, thickness, consists bottom 10 mm 15 mm.

Язык: Английский

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Characteristics of pulsating heat pipe with variation of tube diameter, filling ratio, and SiO2 nanoparticles: Biomedical and engineering implications

Case Studies in Thermal Engineering, Год журнала: 2024, Номер 55, С. 104065 - 104065

Опубликована: Фев. 10, 2024

Pulsating heat pipe (PHP) is an implicit technique through a passive two-stage transfer system. This paper presents the experimentations on PHP contrived using copper with different inner tube diameters of 1, 1.5, 2, and 2.5 mm, respectively. The accused acetone as functional liquid filling proportions varying from 50 to 90% its volume increment 10%. effects proportion diameter thermal performance were investigated. evaporator zone electrically heated mica heater in range 20–80 W, condenser area kept cool by water circulation method. results show that 2 mm performs best compared other diameters, lower rate resistance 0.49 K/W. Also, enhanced at 60% for all diameters. Further, CFD analysis was carried out ratios constant input 80 it revealed test outcomes line results. deviation between experimental numerical studies Considering optimized parameters, i.e., ratio, work extended adding SiO2 nanoparticles base fluid 1–5 % mass concentration. showed value 0.3 W/K higher coefficient 828.64 W/m2 °K obtained 2% concentration SiO2. proportional rise 60 W 11.46, 17, 14, 4.15, 1.94% 3, 4, 5% nanoparticles, Hence, operates better ratio nanoparticles.

Язык: Английский

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Optimizing finned-microchannel heat sink design for enhanced overall performance by three different approaches: Numerical simulation, artificial neural network, and multi-objective optimization

Applied Thermal Engineering, Год журнала: 2024, Номер 245, С. 122835 - 122835

Опубликована: Фев. 29, 2024

Microelectronic devices with multifunctional capabilities have become an indispensable part of the modern life. These generate significant thermal energy during continuous use and elevate chip temperature. Therefore, need for high-efficient microchannel heat sinks as innovative cooling solution has more crucial than ever. This study utilized a multi-nozzle sink incorporating six distinct fin shapes to determine optimal design. Initially, all were numerically simulated, one that provides highest transfer lowest pressure drop was selected candidate further optimization. Then, 27 tests designed examine effect fin's geometric parameters on Nusselt number drop, obtained data training artificial neural network response surface methodology models. Using these model, three chosen such length (Lf), horizontal pitch (Wbf), vertical (Hbf) optimized in specified ranges. In last step optimization process, single-objective different goals: maximizing performance index, number, minimizing multi-objective aiming find right balance between carried out by model genetic algorithm. Besides, Pareto fronts presented show simultaneous impacts objectives. Finally, designs conditions anticipated. R-squared values near 1 illustrated trained had high accuracy predicting device straight-slot fins. Among suggested designs, D1 (Wbf = 145 μm, Hbf 15 Lf 110 μm) improved overall system 13.52 % compared reference sink.

Язык: Английский

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Stretchable-thickness model for dynamic responses of graphene origami reinforced badminton sport plate

Mechanics of Advanced Materials and Structures, Год журнала: 2024, Номер unknown, С. 1 - 13

Опубликована: Июль 8, 2024

In this article, we organize a stretchable-thickness model to present frequency analysis for composite plate applicable in badminton court which is reinforced with origami graphene. A higher order kinematic extended work including three bending, shear, and stretching functions, where the functions responsible satisfying out of plane shear strains stresses at top/bottom surfaces equipment. The sport or composites manufactured from copper matrix graphene effective material properties are calculated based on micromechanical models as function volume fraction folding degree origami, reinforcement temperature. numerical results presented changes fraction, reinforcement, thermal loading along thickness direction. main novelty accounting deformation investigating responses new reinforcement. verification investigation approve methodology, solution procedure. An various ratio plate.

Язык: Английский

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Novel lightweight cement-based materials foaming by secondary aluminum ash: microwave absorption, mechanical and thermal insulation properties

Construction and Building Materials, Год журнала: 2024, Номер 413, С. 134328 - 134328

Опубликована: Янв. 1, 2024

Язык: Английский

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Superhydrophobic MXene-CNT Bridge Strain Sensors with Wide Linear-Range via Strain-isolation and Crack-synergy Effects

Chemical Engineering Journal, Год журнала: 2024, Номер 488, С. 150796 - 150796

Опубликована: Март 28, 2024

Язык: Английский

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Shear-Induced Fabrication of Cellulose Nanofibril/Liquid Metal Nanocomposite Films for Flexible Electromagnetic Interference Shielding and Thermal Management

ACS Applied Materials & Interfaces, Год журнала: 2024, Номер 16(14), С. 17904 - 17917

Опубликована: Март 21, 2024

To address electromagnetic interference (EMI) pollution in modern society, the development of ultrathin, high-performance, and highly stable EMI shielding materials is desired. Liquid metal (LM) based conductive have received enormous amounts attention. However, processing approach LM/polymer composites represents great challenges due to high surface tension cohesive energy LMs. In this study, we develop a universal one-step fabrication strategy directly process containing LMs cellulose nanofibrils (CNFs) successfully fabricate flexible, films with an average specific efficiency (EMI SE) value 429 dB/mm small thickness only 70 μm wide frequency range 8.2–18 GHz. addition, resulting also exhibit excellent mechanical performance flexibility, which endow film ability withstand repeated folding, bending, folding into complex shapes without producing cracks or fractures. Besides, display thermal conductivity λ 4.90 W/(m K) α 3.17 mm2/s. Thus, presented shows potential fabricating advanced for applications.

Язык: Английский

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Multifield and higher-order analysis of sandwich smart curved beams made of graphene origami auxetic metamaterial

Mechanics of Advanced Materials and Structures, Год журнала: 2024, Номер unknown, С. 1 - 19

Опубликована: Март 26, 2024

This article is organized to investigate effect of material and geometric characteristics graphene origami as well multifield loading on the electro-magneto-elastic bending results sandwich smart nanocomposite curved beam. The analysis performed using higher-order shear deformation theory accounting out plane normal strain. constitutive relations are extended in cylindrical coordinate presence thermal, electrical, magnetic loads. governing equations derived principle virtual work with electric works. effective properties reinforced composite core evaluated through Halpin–Tsai micromechanical models rule mixture for modulus elasticity, Poisson's ratio, density. analytical solution presented simply supported boundary conditions based trigonometric functions. A verification test validation formulation, procedure, numerical results. stress components changes along thickness direction. show a significant

Язык: Английский

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Flexible multifunctional Janus film towards self-healing, self-adhesive and streachable EMI shielding

Journal of Colloid and Interface Science, Год журнала: 2025, Номер 685, С. 1056 - 1067

Опубликована: Янв. 23, 2025

Язык: Английский

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