Nanomaterials
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2020
·Vol. 10
·期 12
·2479
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IF 4.324
Shimin Li,Qianqian Xu,Ziji Zhou,Wenchao Zhao,Xiaowen Li,Zhengji Wen,Yao Yao,Hao Xu,Huiyong Deng,Ning Dai,Jiaming Hao
Transparent heat mirrors have been attracting a great deal of interest in the last few decades due to their broad applications, which range from solar thermal convection to energy-saving. Here, we present a flexible Polyethylene terephthalate/Ag-doped Indium tin oxide/Polydimethylsiloxane (PAIP) thin film that exhibits high transmittance in visible range and low emissivity in the thermal infrared region. Experimental results show that the temperature of the sample can be as high as 108 °C, which is ~23 °C higher than that of a blackbody control sample under the same solar radiation. Without solar radiation, the temperature of the PAIP thin film is ~6 °C higher than that of ordinary fabric. The versatility of the large-area, low-radiation-loss, highly-transparent and flexible hydrophobic PAIP thin film suggest great potential for practical applications in thermal energy harvesting and manipulation.Keywords:Ag-doped ITO;transparent heat mirrors;thermal applications;flexible;transparent
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 3
·464
·
IF 5.3
Hanyu Jiang,Xuanjun Wang,Jin Yu,Wenjun Zhou,Shuangfei Zhao,Siyu Xu,Fengqi Zhao
The crystal structure has a great influence on mechanical sensitivity and detonation performance of energetic materials. An efficient microfluidic platform was applied for size, morphology, and crystallinity controllable preparation of ultrafine HMX. The microfluidic platform has good mixing performance, quick response, and less reagent consumption. The ultrafine γ-HMX was first prepared at room temperature by microfluidic strategy, and the crystal type can be controlled accurately by adjusting the process parameters. With the increase in flow ratio, the particle size decreases gradually, and the crystal type changed from β-HMX to γ-HMX. Thermal behavior of ultrafine HMX shows that γ→δ is easier than β→δ, and the phase stability of HMX is β > γ > δ. Furthermore, the ultrafine β-HMX has higher thermal stability and energy release efficiency than that of raw HMX. The ultrafine HMX prepared by microfluidic not only has uniform morphology and narrow particle size distribution, but also exhibits high density and low sensitivity. This study provides a safe, facile, and efficient way of controlling particle size, morphology, and crystallinity of ultrafine HMX.Keywords:energetic material;microfluidic;controllable preparation;ultrafine HMX;thermal application performance
研究领域:
化学工程
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材料科学
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DOI
PubMed
高影响因子
RSC Advances
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2023
·Vol. 13
·期 19
·13252-13262
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IF 3.9
Dongfang Huang,Guixiang Ma,Zhixiao Yu,Peng Lv,Quanbao Zhou,Quanyu Liu,Cheng Peng,Fan Xiong,Yan Huang
Phase change heat storage technology is a good way to solve the problem that the temperature of solar hot water outlet is affected by the time domain. A stearic acid (SA)–benzamide (BA) eutectic mixture is a potential phase change material (PCM), but it still has the disadvantages of low thermal conductivity and liquid leakage. In this work, a new high thermal conductive shape-stabilized composite PCM was prepared by adding boron nitride (BN) and expanded graphite (EG) to a melted SA–BA eutectic mixture using an ultrasonic and melt adsorption method, and its phase change temperature, latent heat, crystal structure, morphology, thermal conductivity, chemical stability, thermal stability, cycle stability and leakage characteristics were characterized. The results indicates that the addition of BN and EG significantly improved the thermal conductivity of the SA–BA eutectic mixture, and they efficiently adsorbed the melted SA–BA eutectic mixture. Besides, when the mass fractions of BN and EG are 15 wt% and 20 wt%, respectively, the 15BN20EG composite has almost no liquid phase leakage. When the melting enthalpy and temperature of 15BN20EG are 132.35 J g−1 and 65.21 °C, respectively, the thermal conductivity of the 15BN20EG is 6.990 W m−1 K−1, which is 20.601 times that of the SA–BA eutectic mixture. Moreover, 15BN20EG shows good thermal stability after 100 cycles and good chemical stability below 100 °C. Therefore, the 15BN20EG composite is considered as a potential candidate for solar thermal applications.
研究领域:
材料科学
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能源工程
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DOI
PubMed
高影响因子
Journal of Cleaner Production
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2025
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IF 10
Xiaolong Li,Haonan Ding,Yu Wang,Jinhai Guo,Yanjun Li,Tiancheng Yuan
To increase the added value of sliced bamboo veneer, this study employs sliced bamboo veneer as a raw material to successfully fabricate magnetic bamboo-based composites using chemical co-precipitation and one-step pyrolysis methods. The microstructure, composition, and electromagnetic wave absorption properties of the prepared composites were systematically investigated. By optimizing the synthesis conditions, Fe 3 O 4 nanoparticles were uniformly embedded within the bamboo-derived carbon framework, forming synergistic interactions that enhanced both dielectric and magnetic loss. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses confirmed the stable presence of Fe 3 O 4 in the composite, significantly improving electromagnetic wave attenuation through interfacial polarization and resonance absorption. Electromagnetic parameter testing revealed that the prepared composites exhibited excellent electromagnetic wave absorption performance within the 2–18 GHz frequency range, achieving an optimal reflection loss of −58.6 dB at 8.08 GHz and an effective absorption bandwidth (EAB) of 2.57 GHz. Simulation results demonstrated that MB-1.5 exhibited the highest electromagnetic attenuation capability. Compared to conventional carbon-based absorbers, this magnetic bamboo-based composite not only offers the advantages of lightweight structure and high absorption efficiency but also exhibits renewability and environmental friendliness. This study presents a novel and sustainable approach for the development of electromagnetic wave absorption materials.
研究领域:
材料科学
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环境科学
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电磁学
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DOI
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Jialu Yang,Bochong Wang,Hanxin Liao,Jianyong Xiang,Congpu Mu,Anmin Nie,Kun Zhai,Tianyu Xue,Fusheng Wen
Flexible electromagnetic interference (EMI) shielding materials are in urgent need in the flexible and wearable electronics fields. In this study, multifunctional flexible silver-coated carbon nanofibers/bacterial cellulose (Ag/CNFs/BC) films were fabricated by vacuum filtration equipment using bacterial cellulose as a flexible substrate. Silver-coated carbon nanofibers were prepared by the chemical deposition method, and the silver was uniformly coated on the surface of carbon nanofibers with scanning electron microscopy (SEM) observation. Compared with the carbon nanofibers/bacterial cellulose (CNFs/BC) films, the EMI performance of Ag/CNFs/BC films was greatly enhanced because of the improvement of conductivity up to 4184 S/m. The EMI shielding effectiveness was highly enhanced over 55 dB in the X-band (8–12 GHz) under a relatively low thickness of 34 μm for the Ag/CNFs60/BC film. Moreover, the Ag/CNFs60/BC film also showed great multifunctional thermal applications. A Joule heating of over 110 °C at 3 V direct current and a photothermal conversion over 60 °C under an optical power density of 100 mW/cm2 were achieved. These results indicated that the Ag/CNFs/BC films with nanomaterials have huge application potential as flexible wearable self-heating products with excellent electromagnetic shielding performances.
研究领域:
材料科学
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电子工程
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纳米技术
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DOI
高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 12
·7981-7999
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IF 5.7
Sadi Mohammad Shak,Kumpikaitė Eglė
Highly conductive polypyrrole (PPy)/single-walled carbon nanotube (SWCNT)/polydopamine (PDA)/cotton composite fabrics were developed for wearable sensing and joule heating applications. The PDA templated pristine knitted cotton fabric was dip-coated with SWCNT prior to the chemical polymerization of PPy. The different composites were characterized by employing scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The PDA-induced surface modification of the cotton fabric ensured optimum absorption of the SWCNT molecules present in the coating media and provided an active substrate surface for PPy deposition. The presence of PPy significantly improved the electrical conductance of the SWCNT/PDA/cotton fabric and exhibited a superior conductivity of 8 Ω/sq. The composites showed improved electromechanical performance and excellent wearable sensing profile while monitoring different human motions such as finger bending, handwriting, drinking, etc. in real-time. In addition, the uniform heat distribution of the composite fabric attached to the hand gloves confirmed its suitability for a wearable thermal device that could reach 144.6 °C within 100 s after heating at 5 V. The fabrication of PPy/SWCNT/PDA/cotton composite fabric offers a facile but effective approach to develop durable electronic textiles for wearable applications.
研究领域:
材料科学
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纺织工程
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电子工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）