COMPOSITES PART B-ENGINEERING
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2021
·
IF 9.078
He Cao,Yishi Su,Di Zhang,Qiubao Ouyang
Lightweight aluminum matrix composites with excellent mechanical and thermal properties are urgently required in applications of aerospace, electronics and military industries owning dimensional stability and long-life span. Antiperovskite manganese nitrides can be regarded as ideal reinforcements due to their high mechanical properties , low negative thermal expansion and wide temperature ranges. In this paper, 30 vol % Mn 3.1 Zn 0.5 Sn 0.4 N/Al composites with Mn 3.1 Zn 0.5 Sn 0.4 N particle sizes of 130, 63 and 12 μm were fabricated by vacuum hot-pressing sintering under sintering temperatures of 450, 500 and 550 °C, respectively. Material phase analysis, microstructural characterization, and bulk density measurements of Mn 3.1 Zn 0.5 Sn 0.4 N/Al composites are conducted. Three-point bending and nano-indentation mechanical properties of Mn 3.1 Zn 0.5 Sn 0.4 N/Al composites are studied, while thermal expansion and conductivity of Mn 3.1 Zn 0.5 Sn 0.4 N/Al composites are also investigated. For the Mn 3.1 Zn 0.5 Sn 0.4 N/Al composite sintered at 450 °C with particle size of 130 μm, the Young's modulus of 87.35 GPa, flexural strength of 169.3 ± 7.60 MPa and flexural strain of 3.62 ± 0.09% are produced. Meanwhile, the lowest coefficient of thermal expansion of 3.14 ppm °C −1 and largest thermal conductivity of 126.2 ± 7.0 W m −1 K −1 are possessed as well. Semi-coherent and coherent interfaces of Al–Mn and Sn–Mn 3.1 Zn 0.5 Sn 0.4 N with a width of ~100 nm are determined, which clearly indicates the interfacial characteristics within the Mn 3.1 Zn 0.5 Sn 0.4 N/Al interfacial micro-zones. This work can provide a good understanding and guide for designing and preparing novel structural-functional composite materials with excellent mechanical and thermal properties.
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高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
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2021
·
IF 3.189
Hao Luo,Rui-Ying Luo,Lian-Yi Wang,Peng Huang
A novel graphene modified high-temperature resistant adhesive for bonding carbon/carbon composites was developed. The effects of graphene content on the mechanical properties , thermal conductivities and braking properties of the carbon/carbon joints were studied. When the graphene content in the adhesive was 1.5 wt%, the specimens possessed the bonding strength of 13.2 MPa and the thermal conductivity of 23.89 W/(m•k), which were 63.09% and 145.03% higher than those of 0.0 wt%, respectively, and 24.38% and 64.53% higher than those of 5.0 wt%, respectively. The excellent properties were attributed to the uniform dispersion of graphene in the adhesive matrix, which could effectively reduce the stress concentration and provide a fast heat conductivity network chain. The adhesive properties also had an obvious influence on the braking performance. Finite element analysis considered that the main reason for the difference in braking performance was that the temperature and field distribution on the friction surface were affected by the thermal conductivity of the adhesive.
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Green Energy & Environment
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2021
·
IF 8.207
Yifei Wang,Wending Pan,Kee Wah Leong,Shijing Luo,Xiaolong Zhao,Dennis Y.C. Leung
Hydrogel electrolyte is especially suitable for solid-state Al-air batteries targeted for various portable applications, which may, however, lead to continuous Al corrosion during battery standby. To tackle this issue, an ethanol gel electrolyte is developed for Al-air battery for the first time in this work, by using KOH as solute and polyethylene oxide as gelling agent. The ethanol gel is found to effectively inhibit Al corrosion compared with the water gel counterpart, leading to stable Al storage. When assembled into an Al-air battery, the ethanol gel electrolyte achieves a much improved discharge lifetime and specific capacity, which are 5.3 and 4.1 times of the water gel electrolyte at 0.1 mA cm −2 , respectively. By studying the gel properties, it is found that a lower ethanol purity can improve the battery power output, but at the price of decreased discharge efficiency. On the contrary, a higher polymer concentration will decrease the power output, but can bring extra benefit to the discharge efficiency. As for the gel thickness, a moderate value of 1 mm is preferred to balance the power output and energy efficiency. Finally, to cater the increasing market of flexible electronics, a flexible Al-air battery is developed by impregnating the ethanol gel into a paper substrate, which can function normally even under serious deformation or damage.
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COMBUSTION AND FLAME
·
2021
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IF 4.185
Kaiwen Shi,Xiaode Guo,Ling Chen,Shanshan Huang,Linlin Zhao,Jie Ji,Xiang Zhou
Metastable intermolecular composites (MICs), also called nanothermites, are attracting wide attention mainly due to the increased interfacial contact area of the fuels and oxidants therein. In this study, an alcohol-thermal technique is adopted to synthesize approximately core-shell structured Al@CuO MICs, in which process copper acetate is used as the precursor of CuO while Al powder with a wide size distribution (50 nm−5 µm in diameter) is used as cores. The energy-release characteristics of the materials are studied by performing thermal analysis, constant-volume combustion cell tests, and high-speed camera imaging of the combustion process . The results show that Al nanoparticles are surrounded by CuO nanoparticles that are with an average diameter of about 10 nm, while micron-sized Al particles are coated by a continuous layer of nanoplatelets that are assembled from CuO nanoparticles. Benefiting from the enhanced interfacial contact compared with that of ultrasonically mixed counterpart, Al@CuO shows a lower apparent activation energy of solid-state interfacial reaction, a higher light intensity, a shorter burning time, a larger pressure output, and a higher pressurization rate. It is also found that equivalent ratio has a great effect on the combustion process, and a slightly fuel-rich formulation is preferred in this study. The synthesis method developed in this study may also be adapted to the preparation of other core-shell structured MICs.
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TALANTA
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2021
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IF 6.057
Hongyuan Cui,Xueqi Fu,Lin Yang,Shu Xing,Xiao-Feng Wang
The emerging two-dimensional titanium carbides (MXenes) have a large potential in biomedical sensing owing to their excellent electrical and optical properties . Herein, a fluorescence resonance energy transfer (FRET) aptasensor with high sensitivity and specificity was constructed with single layer Ti 3 C 2 MXene for quantitative detection of thrombin. The dye labelled thrombin-binding aptamer (TBA) was deposited on the surface of Ti 3 C 2 , and the fluorescence of which was efficiently quenched owing to the FRET between the dye and Ti 3 C 2 . The fact that thrombin forms quadruplex with TBA on Ti 3 C 2 surface is due to the high electronic affinity between thrombin and Ti 3 C 2 . This process will cause the subsequent detachment of dye from the surface of Ti 3 C 2 , resulting in the recovery of fluorescence. Because of the special structure and high fluorescence quenching efficiency of Ti 3 C 2 MXene, the aptasensor shows a high sensitivity with a low detection limit for thrombin at 5.27 pM. Three different aptamers were compared, and the aptamer HD22 is most sensitive for detection of thrombin originated from its great specificity in the human plasma. Importantly, this Ti 3 C 2 MXene-based FRET aptasensor can detect thrombin in human serum accurately. These results suggest that the Ti 3 C 2 MXene-based FRET aptasensor hold a great prospect in clinical diagnosis in the real-world applications.
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PubMed
高影响因子
COMBUSTION AND FLAME
·
2020
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IF 4.57
Qianqian He,Jun Wang,Yaofeng Mao,Huamo Yin,Wei Cao,Fude Nie
The incorporation of aluminum (Al) into explosives represents a facility and efficient way to enhance the energy output through the secondary reaction between Al and the detonation products of explosive. The Al/O ratio and microstructure of HMX/Al play critical roles in combustion performance and energy output. Herein, a gradient structured HMX/Al composite has been designed and fabricated via 3D printing technology using well-dispersed HMX/Al-based ink. For HMX/Al lines, the second reaction heat increases from 196.5 J/g to 1644.8 J/g and the burning rate would decrease from 14.6 to 12.0 mm/s with Al content increased from 10 to 30 wt%. For gradient structured HMX/Al, the burning rate could be controlled by varying the component ratio and the burning rate of each component in the gradient structure was higher than that of the normal HMX/Al counterpart. Furthermore, a gradient evolution of pressure output was monitored for gradient structured HMX/Al cylinder ignited by the laser. These results indicate that the gradient structure as an effective approach can tune combustion performance and energy output of HMX/Al.
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Energy Storage Materials
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2020
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IF 16.28
Yu Long,Huan Li,Mingchun Ye,Zhengyu Chen,Zihan Wang,Ying Tao,Zhe Weng,Shi-Zhang Qiao,Quan-Hong Yang
Great progress has been made in the development of cathode materials for Al-metal batteries . However, the in-depth study of Al anodes, especially the battery instability caused by Al dendrite growth, has not received much attention. In this work, we have identified the in-situ formation of Al dendrite growth, which is proved to bottleneck the practical use of Al-metal batteries. The dendrite formation severely affects battery performance, such as voltage and efficiency fluctuations, unstable cycling, etc. To further demonstrate the detailed growing process of dendrites, we make a comprehensive investigation into the interfacial chemistry of Al anode. We have found that the naturally formed Al 2 O 3 surface film is dissolved in the ionic liquid electrolyte during Al plating, accompanied by the formation of solid-electrolyte interphase containing Al-Cl and Al-O like species on the anode surface before dendrite growth. To suppress this dendrite growth, we propose the use of porous Al, which provides a homogeneous ion flux and decreases the local current density. As a result, the porous anode maintains stable cycling over a wide range of current densities and areal capacities. The Al-graphite battery shows stable cycling up to 18000 times without capacity decay. This work suggests the significance of suppressing dendrite growth for the real applications and commercialization of Al-metal batteries and will draw attention to the battery design from the anode side .
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NANOTECHNOLOGY
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2020
·Vol. 32
·期 1
·015708
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IF 3.551
Ze-Ru Zhu,Wenming Geng,Qingxia Zhu,Anita Sagadevan Ethiraj,Tao Wang,Li-Chao Jing,Yu-Jie Ning,Yi Tian,Wen-Hao Geng,Lei Wu,Hong-Zhang Geng
In this paper, we used tannic acid (TA) functionalized carbon nanotubes (TCNTs), and silver nanowires (AgNWs) to construct a new type of transparent conductive film (TCF) with a double-layered conductive network structure. The hybrid film exhibits excellent light transmittance, high electrical conductivity, ultra-flexibility, and strong adhesion. These outstanding performances benefit from the filling and adhesion of hydrophilic TCNT layers to the AgNW networks. Besides, we introduced the post-treatment process of mechanical pressing and covering polymer conductive polymer PEDOT:PSS, which obtained three layers of TCNT/AgNW/PEDOT hybrid film and greatly improved the comprehensive properties. The hybrid film can reach a sheet resistance of 9.2 Ω sq−1 with a transmittance of 83.4% at 550 nm wavelength, and a low root mean square (RMS) roughness (approximately 3.8 nm). After 10 000 bends and tape testing, the conductivity and transmittance of the hybrid film remain stable. The resistance of the film has no significant degradation after 14 d of exposure to high temperature of 85 °C and humidity of 85%, indicating excellent stability. The organic light-emitting diodes (OLEDs) with TCNT/AgNW/PEDOT hybrid film as anode exhibit high current density and luminosity, confirming this process has considerable potential application in photovoltaic devices.
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PubMed
高影响因子
Nano Research
·
2020
·Vol. 14
·期 3
·646-653
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IF 8.183
Jiao Handong,Jiao Shuqiang,Song Wei-Li,Xiao Xiang,She Dongmei,Li Na,Chen Haosen,Tu Jiguo,Wang Mingyong,Fang Daining
Rechargeable Al-ion batteries (AIBs) are considered as one of the most fascinating energy storage systems due to abundant Al resource and low cost. However, the cycling stability is subjected to critical problems for using Al foil as negative electrode, including Al dendrites, corrosion and pulverization. For addressing these problems, here a lightweight self-supporting N-doped carbon rod array (NCRA) is demonstrated for a long-life negative electrode in AIBs. Experimental analysis and first-principle calculations reveal the storage mechanism involving the induced deposition of N-containing function groups to Al as well as the ideal skeleton of the NCRA matrix for Al plating/stripping, which is favorable for regulating Al nucleation and suppressing dendrites growth. Compared with the Al foil, the NCRA exhibits lower areal mass density (∼ 72% of Al foil), smaller thickness (40% of Al foil), but much longer cycle life (> 4 times of Al foil). Benefiting from the remarkable stability of the array structure, symmetric cells show excellent cycling stability with small voltage hysteresis (∼ 80 mV) and meanwhile there are no corrosion and pulverization problems even after cycled for 120 hours. Besides, full cells also manifest long lifespan (1,500 cycles) and increased Coulombic efficiency (100±1%).
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CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Bingbing Chen,Aihu Feng,Kun Liu,Jiao Wu,Yun Yu,Lixin Song
Ti 3 C 2 T x is a promising intercalation-type electrode material for capacitive deionization (CDI). However, Ti 3 C 2 T x , obtained from traditional synthesized Ti 3 AlC 2 , is with large particle size and undersized interlayer space, which can easily lead to the longer ion diffusion path, fewer adsorption sites, and higher ion diffusion barrier in CDI process. In this work, subsize and Na + intercalated Ti 3 C 2 T x (Na + -Ti 3 C 2 T x -MS) was prepared by HF etching KCl-assisted molten-salt synthesized Ti 3 AlC 2 and following NaOH treatment. The Na + -Ti 3 C 2 T x -MS achieves a high electrosorption capacity of 14.8 mg/g and a high charge efficiency of 0.81 at the applied voltage of 1.2 V in 100 mg/L NaCl solution. Besides, the stable desalination performance of Na + -Ti 3 C 2 T x -MS has been confirmed. The superior performance of Na + -Ti 3 C 2 T x -MS can be attributed to the subsize particle and larger interlayer space. Both two factors can effectively increase ions adsorption sites, shorten diffusion path lengths, and reduce diffusion barriers in the CDI process.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Huifang Wang,Jun Zhang,Qichong Zhang,Hao Wu,Xiaohong Xu
The p-n heterojunctions with the built-in electric field are often adopted to promote the separation of photoexcited electron-hole pairs and enhance the photoelectrochemical (PEC) performance. However, the interface states often affect the band alignment of ZnO/Cu 2 O heterointerface and cause the decline of PEC performance. In this study, the ultrathin insulating Al 2 O 3 layer was introduced to modify the interface between n-type ZnO nanorod arrays (NRA) and p-type Cu 2 O. Compared to that of ZnO NRA/Cu 2 O, the photocurrent density is significantly improved and onset potential shifts negatively for ZnO NRA-Al 2 O 3 /Cu 2 O. The Al 2 O 3 ultrathin layer is deemed to suppress the photoexcited carriers trapped by the heavy interface defect states via improving the interface quality and block the recombination between electrons in the conduction band of ZnO NRA and holes in the valence band of Cu 2 O. This work broadens the interface modification method of p-n heterojunction and its results are favorable for photovoltaic devices, photodetection and PEC water splitting applications.
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Physica Status Solidi-Rapid Research Letters
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2020
·Vol. 15
·期 4
·2000563
·
IF 2.291
Xinhua Li,Qingshuang Ma,Ji Dong,Tansir Ahamad,Zongqing Ma
The Nb 3 (Al 1− x Sn x ) superconductor with enhanced critical current density ( J c ) is prepared by the process of mechanical alloying (MA) and subsequent low-temperature sintering and the enhancement mechanism of J c in Nb 3 (Al 1− x Sn x ) is discussed. The analysis of the flux pinning force implies that there is an additional pinning mechanism apart from grain boundary pinning in Nb 3 (Al 1− x Sn x ). The existence of dispersed Nb 2 Al nanoparticles (<30 nm) in Nb 3 (Al 1− x Sn x ) is confirmed by microstructure observation. These nanosized Nb 2 Al particles can serve as flux pinning centers, which leads to the increase of the flux pinning force as well as the enhancement of Nb 3 (Al 1− x Sn x )'s J c performance.
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高影响因子
危险品化学品经营许可证（带存储）