CERAMICS INTERNATIONAL
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2024
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IF 5.1
Ao Zhang,Wei Wang,Ruopeng Cui,An Du,Jinsheng Jia,Yonggang Huang,Chunlei Wan,Ruina Ma
The preparation of multifunctional microwave absorbing materials with the characteristics of stronger absorption, wider bandwidth, lighter weight, higher strength and thinner thickness is an urgent research direction. Due to the difficulty of controllable distribution of absorbers, excellent microwave absorption performance is usually accompanied by large absorber amount and thickness, which can result in microwave absorption composite materials lack flexibility, mechanical properties, and adaptability to the environment. In this study, Ti 3 C 2 T x /Fe 3 O 4 /glass fiber paper composite was prepared by vacuum-assisted filtration. The controllable pore structure constructed by glass fiber enables uniform distribution of MXene/Fe 3 O 4 and effectively spreading of MXene monolayer film, enhancing conductivity loss and interface loss. By controlling the diameter of glass fiber, the pore size and the distribution of absorber can be regulated, thereby achieving a minimum reflection loss of up to −57.2 dB at an ultra-low filling ratio of 1.66 wt%. With the addition amount of 1.90 wt%, the effective absorption bandwidth can cover the whole X-band. The ultra-low specific reflection loss exceeds most of fabric materials and MXene-based absorbers. Meanwhile, the composite material exhibited excellent mechanical properties with a tensile strength of 3.054 kN/m and a burst resistance of 290 kPa. In addition, the adhesion between the filler and the glass fiber was increased by adding acrylic resin-based aqueous adhesive, and the surface grafting functional group (-F) made the composite material superhydrophobic. This work provides a new strategy to synthesize multifunctional absorbing material with low filling ratio and strong environmental practicality.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2024
·
IF 3.2
Xiaoming Wang,Li Li,Yan Lin,Jin Xu,Jiatao Zhao,Xiaoguang Zhang,Fei Wang,Xiaolin Wang
The use of porous media as a fixed bed for promoting methane hydrate formation has been endowed with great potential in hydrate-based energy storage. In this work, a graphene aerogel (GA) with a one-piece structure and ultralight weight was prepared and adopted for the first time as a fixed bed for methane hydrate formation. In particular, the effects of the filling ratio and hydrophobic–hydrophilic properties of GA on the promotion efficiency were comprehensively investigated. In the range of 84–95%, a lower filling ratio resulted in higher promotion efficiency, which at 84% increased the methane storage capacity and apparent storage capacity from 114.4 ± 7.6 and 52.4 ± 6.7 V/V to 146.3 ± 6.5 and 91.1 ± 13.0 V/V, respectively. Cryo-scanning electron microscopy (Cryo-SEM) demonstrated that the hydrates formed in the inner pores of GA but also revealed the existence of empty pores, indicating that part of the reaction solution migrated out of the GA. Fortunately, by regulating the hydrophilic–hydrophobic properties of GA, the migration of the reaction solution during hydrate growth could be controlled, and the methane storage capacity could be optimized. More importantly, GA produced excellent advantages in terms of gravimetric storage capacity over traditional media and, therefore, produced great potential in serving as an ultralight fixed bed for the industrial application of hydrate-based energy storage.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2024
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IF 11.2
Yan Cheng,Yongzhen Ma,Kai Zhou,Zhixin Cai,Yanlong Ma,Binglong Zheng,Huanqin Zhao,Hongwei Zhou,Haibo Yang,Renchao Che
Carbon materials have made significant progress in the field of microwave absorption (MA), but achieving wide effective absorption bandwidth (EAB) at low filler content still remains a great challenge. In this work, we design multi-shell bowl-like mesoporous carbon microspheres (MBMCs) by a facile hard template method for efficient MA. It is demonstrated that the spacing between inner and outer shell and second shell thickness play a vital role on the configuration of carbon microspheres. By controlling the second addition of silica template, the microstructure of carbon microsphere evolves from spherical to bowl shape geometry. Expanded shell spacing is beneficial for forming bowl-like microsphere. The dielectric loss and MA properties are highly associated with the configuration of MBMCs. Well-proportioned MBMCs with appropriate shell spacing present wide EAB of 7.3 GHz under a low filling ratio of 12 wt.%. This work paves a new way to broaden EAB and lower filling content of carbon materials via asymmetric multilayer microstructure design.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Huichao Du,Chao Xiao,Miao Jiang,Xusheng He,Yanyan Wang,Xin Ding,Xian Zhang,Xiaofei Li,Kang Zheng,Xianglan Liu,Lin Chen,Meng Xue,Xingyou Tian,Hui Zhang
The significant degradation in mechanical properties and filling-gap performance of thermal interface materials (TIMs) under high filling ratios remained a prevalent problem. Here, a polytetrafluoroethylene (PTFE) based composite film with excellent flexibility at ultra-high hybrid fillers content (up to 90 wt%) was developed through the mechanical interlocking strategy. Due to the sufficient fibrosis of PTFE under shear stress, boron nitride (BN) and aluminum nitride (AlN) were firmly constrained inside the fiber cage. The hybrid fillers arranged into a seesaw-like structure during the calendering process, which facilitated the formation of thermal conductive network in both horizontal and vertical directions. Importantly, this unique embedded structure allowed for direct contact between the fillers and the heat source, resulting in a 90.45% decrease in interfacial thermal resistance . The resultant film possessed a high thermal conductivity (4.3 W/m·K, in-plane, 0.75 W/m·K, out-plane), low dielectric constant (3.1, 10 GHz), and excellent flexibility, making it suitable for application of interface heat dissipation in high-frequency electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
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2023
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IF 6.7
Chao Chang,Lilin Pei,Bo Li,Zhaoyang Han,Yulong Ji
Nowadays, the solar-thermal technology, converting solar energy into useful thermal energy, was regarded as a direct and facile method to harvest solar irradiation for alleviating the energy crisis and environmental issues. In this work, we reported a transparent solar-driven heat pipe filled with rGO nanofluids, which combined volumetric solar-thermal harvesting and heat pipe technology to realize efficient solar capture while fast transporting of the collected thermal energy to the application ends simultaneously. The rGO nanofluids not only were used as solar volumetric absorbers to absorb solar radiation directly, but also completed the whole thermal cycle as the working fluid. We investigated the impact of filling ratio, inclination angle, working fluids, and solar power density on the thermal property of the heat pipe experimentally. It was found that 20% was the optimal filling ratio for the heat pipe with a lowest thermal resistance of 0.25 K/W at the solar power density of 17.5 W/cm 2 . Under the vertical operation mode, the heat transfer performance of the solar-driven heat pipe was better than that under the horizontal operation mode. Finally, this developed solar-driven heat pipe had been successfully applied for solar water heating systems, showing excellent heat transfer performance.
研究领域:
能源技术
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）