ACS Nano
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2021
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IF 15.881
Chao Wang,Na Meng,Aijaz Ahmed Babar,Xiaobao Gong,Gaohui Liu,Xianfeng Wang,Jianyong Yu,Bin Ding
Currently, the quest for highly transparent and flexible fibrous membranes with robust mechanical characteristics, high breathability, and good filtration performance is rapidly rising because of their potential use in the fields of electronics, energy, environment, medical, and health. However, it is still an extremely challenging task to realize transparent fibrous membranes due to serious surface light reflection and internal light scattering. Here, we report the design and development of a simple and effective topological structure to create porous, breathable, and high visible light transmitting fibrous membranes (HLTFMs). The resultant HLTFMs exhibit good optical performance (up to 90% transmittance) and high porosities (>80%). The formation of such useful structure with high light transmittance has been revealed by electric field simulation, and the mechanism of fibrous membrane structure to achieve high light transmittance has been proposed. Moreover, transparent masks have been prepared to evaluate the filtration performance and analyze their feasibility to meet requirement of facial recognition systems. The prepared masks display high transparency (>80%), low pressure drop (<100 Pa) and high filtration efficiency (>90%). Furthermore, the person wearing this mask can be successfully identified by facial recognition systems. Therefore, this work provides an idea for the development of transparent, breathable, and high-performance fibrous membranes.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2021
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IF 5.302
Zetan Liu,Jingkun Xu,Xiaoqing Xi,Ji Zhou
Ti 2 AlN powders were synthesized through molten salt method and re-calcination process using TiH 2 , Al and TiN powders as raw materials at 1100 ℃. The composition of final composite was directly influenced by the initial Al and TiH 2 content in the starting mixture. The purity of the synthesized Ti 2 AlN powder could reach 97.1 wt% when the Al molar ratio was 1.05. Then high strength Ti 2 AlN ceramics were successfully prepared in different modes, including two forms of pulse electric current sintering (PECS/SPS) and hot-pressing sintering (HP). A record-high flexural strength of 719 MPa was obtained for the PECS/SPS with an electrical insulating die (PECS/SPS II) sintered sample, based on the synthesized powder in which the initial molar ratio of Al was 1.1. The sintering behaviors in various modes were analyzed, confirming the shrinkage of particles starting at lower temperature in PECS/SPS II. The density, microstructure, Vickers hardness and elastic modulus of sintered ceramics were also investigated. Therefore, the present work provided the new methods about powder preparation and ceramic sintering of Ti 2 AlN, making it possible to be used as high strength structural ceramics .
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Materials Today Communications
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2021
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IF 3.383
Jinzhao Guan,Kaiyu Xie,Aimin Liu,Zhongning Shi,Gong Chen,Miroslav Boca
In this study, Al–Si alloy, a precursor of the solar-grade silicon , was prepared via the aluminothermic reduction–molten salt electrolysis of SiO 2 in KF–AlF 3 molten salt by employing liquid aluminum as the working cathode. The reaction mechanism of the aluminothermic reduction of SiO 2 in KF–AlF 3 molten salt at 750 °C was determined by thermogravimetry–differential scanning calorimetry. The reaction rate equation for the aluminothermic reduction of SiO 2 in KF–AlF 3 molten salt was: d α dt = 7.156 × 10 24 e − 4.688 × 10 5 RT ( 1 − α ) 1.734 . In 49.4 wt% KF–47.6 wt% AlF 3 –3 wt% SiO 2 molten salt at 750 °C, the Si content in the Al–Si alloy obtained by the aluminothermic reduction–molten salt electrolysis of SiO 2 was 24.53 wt%. Compared with solely aluminothermic reduction of SiO 2 , the current efficiency in the process of the aluminothermic reduction–molten salt electrolysis of SiO 2 was evaluated. The results reveal that the Al–Si alloy is predominantly prepared in the aluminothermic reduction step, while supplemented by electrolysis. The calculated Faradic current efficiency of the proposed aluminothermic reduction–molten salt electrolysis process was 28.4%.
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JOURNAL OF PHYSICAL CHEMISTRY B
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2021
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IF 2.991
Jinxia Wang,Xiangyue Liu,Hongwei Xie,Huayi Yin,Qiushi Song,Zhiqiang Ning
The magnetohydrodynamic (MHD) effect was usually used to improve the mass transport during electrodeposition in a solution electrolyte. Herein, we reported the effect of a magnetic field on the electrode process of Al electrodeposition in a [Emim]Cl-AlCl3 ionic liquid composed of pure ions. Under a uniform and perpendicular magnetic field to the Cu electrode plane, electrochemical impedance spectroscopy (EIS) of the circuit, the cyclic voltammetry (CV) curves, and the different capacitances at the potential of zero charge (PZC) were measured, and the electrodeposition of aluminum was carried out at a constant current density. The results indicated that a vertical magnetic field significantly reduced the resistance (activation energy) for charge transfer of electrochemical reduction of Al2Cl7–; meanwhile, the capacitance of an electric double layer (EDL) and the density of the electrodeposited aluminum layer were increased.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2021
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IF 8.067
Wei Luo,Yi Liu,Chuangye Wang,Dan Zhao,Xiaoyan Yuan,Jianfeng Zhu,Lei Wang,Shouwu Guo
The morphology of MAX phase powders significantly influences their microwave absorption properties. However, the traditional synthesis via solid-state reactions produces irregular powders, and the preparation of MAX phase powders with specific morphology remains a challenge. Herein, (V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC MAX phase microrods were fabricated for the first time in NaCl/KCl molten salts using vanadium, titanium, chromium, aluminum , and short carbon fibers as precursors. It was found that despite acting as a carbon source, carbon fibers also acted as sacrificial templates. By adjusting the molar ratio of metal powders and short carbon fibers, a series of carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with core-sheath structure were also obtained. Carbon fiber@(V 0.8 Ti 0.1 Cr 0.1 ) 2 AlC microrods with a molar ratio of 8:2 showed the optimum microwave absorption performance. The reflection loss (RL) value reached up to –63.26 dB at 2.40 mm, and the effective absorption bandwidth (EAB) was about 5.28 GHz with a thickness of 2.02 mm. Based on the electromagnetic parameter analysis and theoretical simulation, the enhanced microwave absorption performance was attributed to the synergistic effect of different factors like dielectric loss, magnetic loss, multiple reflection, and scattering. This work offers a facile route to modulate the morphology of MAX phase powders and may accelerate its application as microwave absorbers.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Hao Zhong,Kang Chen,Chenglei Qin,Chengguang Lang,Jiangwen Liu,Hui Wang,Junrui Zhang,Liuzhang Ouyang
Onsite hydrogen generation by sodium borohydride hydrolysis resolves hydrogen energy supply system challenges. However, the spent-NaBH 4 regeneration is still a problem in the closed loop of this irreversible reaction. As the by-product is the key to the problem, NaB(OH) 4 is regarded as not the boron source but the hydrogen source of NaBH 4 regeneration. Therefore, in this study, inexpensive Al metal and NaB(OH) 4 are ball milled under argon to regenerate NaBH 4 without additional hydrogen input. However, the ball-milling reaction is hindered by the flexible Al and impact oxide layer, and the NaBH 4 yield is only approximately 22 %. Therefore, a brittle intermetallic compound Mg 2 Al 3 is reacted with NaB(OH) 4 by ball milling, achieving a NaBH 4 yield of over 42 %. The mechanism study shows that the brittleness of the raw material plays an important role in promoting the ball-milling reaction. This study achieves NaBH 4 regeneration using only Al as the reducing agent and provides a promising method to promote the mechanochemical regeneration of NaBH 4 .
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COMBUSTION AND FLAME
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2023
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IF 4.4
Lichen Zhang,Xiaodong Li,Shuo Wang,Xing Su,Meishuai Zou
Ammonium perchlorate (AP) is an important oxidant of solid propellant, and its decomposition is of great significance for improving combustion properties of solid propellants. However, it is difficult to balance AP-catalytic effect, ignition and energy level. In this study, lithium hexafluorophosphate (LiPF 6 ), ferric chloride (FeCl 3 ) and 1,2,4-triazole were self-assembled on aluminum particles via ionic bonding and metallic coordination. It highly catalyzed the thermal decomposition of AP, which reduced the decomposition temperature of AP by 29.4 °C. The thermal oxidation reactivity of coated-aluminum was much higher than that of raw aluminum powder, and its exothermic enthalpy was 3.45 times that of raw aluminum. The combustion heat was also improved. After ignition delay of 0.2 s, Al/CM-4 was burnt violently at 740 °C, while raw Al could not be ignited even at 950 °C. Our work provides an effective strategy for high-performance self-assembly coating on Al fuels, which addressed big significance in AP-containing propellants and explosives. Besides, such organic/inorganic composite self-assembly system may also be instructive for future design of heterogeneous surface, multifunctional coating, protective interface, and etc.
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Journal of Materials Research and Technology-JMR&T
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2023
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IF 6.4
Bo Dong,Chengji Deng,Jun Ding,Hongxi Zhu,Qian Wang,Yong Zhang,Chao Yu
In this investigation, we have employed a novel approach to fabricate β–Sialon/Ti(C, N) composites through the nitridation treatment of Ti 3 SiC 2 powder. At temperatures ranging from 1373 to 1773 K, the reaction process was subjected to a comprehensive analysis to explore the transformation of phase and microstructure. The findings unequivocally highlight the influence of α–Al 2 O 3 presence and the high specific surface area of Ti 3 SiC 2 powder, resulting in distinctive phase and structural evolutions post nitridation, distinctly different from those observed in bulk Ti 3 SiC 2 . The β–Sialon/Ti(C, N) composites produced via this innovative method exhibit uniform local chemical composition and meticulous regulation of grain morphology. Moreover, the synthesis mechanism of β–Sialon/Ti(C, N) composites under nitrogen ambiance was thoroughly discussed. This straightforward approach has the potential for extensive–scale synthesis of β–Sialon/Ti(C, N) composites, offering promising avenues for their application in developing high–performance refractories or structural ceramics tailored to withstand severe high–temperature environments.
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CORROSION SCIENCE
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2023
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IF 8.3
Zhichao Shang,Xiaoping Cai,Farshid Pahlevani,Yan Zheng,Akbar Hojjati-Najafabadi,Xinran Gao,Baojing Zhang,Peizhong Feng
High porosity Co-Al-Fe intermetallic with 3D-microstructures were one-step synthesized via a novel thermal explosion reaction. A link between pore structure and permeability was established using 3D-XRM technology. The corrosion resistance of the samples with different Fe contents was investigated at 900 °C under an oxygen/sulphur atmosphere for up to 120 h. The results showed that the pore structure of the samples remains stable, and the internal matrices are intact due to the formation of a thin protective layer of Al 2 O 3 and Fe 2 O 3 on the surface of the product skeleton. In addition, inward diffusion of S leads to the formation of FeS nodules.
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ADVANCED ENGINEERING MATERIALS
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2023
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IF 3.6
Kai Wang,Hengtai Zhang,Jinrong Liang,Zhigang Xu,Shangyu Huang,Jian Peng,Chao Yang,Wenjun Li,Qiang Shen,Chuanbin Wang
Al content is of great importance for the evolution of the microstructure and compressive performance of the high-Mn and high-Al porous steels. Herein, Fe–Mn–Al porous steels with different Al contents are prepared via powder sintering at different temperatures. The results show that the main phases of the sintered samples at 640 °C are α-Fe, α-Mn, and Al, while a small amount of Fe 2 Al 5 and Al 8 Mn 5 exists in the samples with 15 and 20 wt% Al. At 1200 °C, the sintered sample with 5 wt% Al is composed of γ-Fe, while those with 15 and 20 wt% Al are mainly α-Fe. The length of Mn depletion region and porosity of the samples increase with the increase of Al content. The largest total and open porosity are observed in the 1200 °C-sintered sample with 20 wt% Al, which are 63.1 and 60.7 vol%, respectively. The compressive strength decreases sharply from 770 MPa for the sample with 5 wt% Al to 7.5 MPa with 15 wt% Al, after sintering at 1200 °C. Ductile fracture occurs in the sample with 5 wt% Al, while brittle fracture is the main fracture mode in those with 15 and 20 wt% Al.
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JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Jibao Deng,Hefei Wang,Yan Su,Ke Shen,Xuwen Chen,Xian Zhou,Xiaojie Hu,Yanzheng Gao
Microwave irradiation is a promising technology for the remediation of soil contaminated by organic contaminants . However, the roles of volatilization and decomposition in microwave removal of polycyclic aromatic hydrocarbons (PAHs) in soil have not yet been quantitatively determined. A model describing the removal efficiency of benz(a)anthracene (BaA) at different treatment times and varied conditions was constructed, wherein BaA removal efficiency was positively and linearly correlated with soil temperature . BaA removal in soil was attributed to thermal volatilization (97.8%) and decomposition (2.2%). Radicals such as ∙OH and ∙O 2 − were found to initiate BaA decomposition, the pathway of which was elucidated through HPLC-MS analysis, revealing benz(a)anthracene-7,12-dione as the main intermediate product. The new ideas and perspectives founded in this study offer theoretical support for microwave remediation of organic compound–contaminated sites.
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Nature Energy
·
2023
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IF 56.7
Dai Tao,Wu Siyuan,Lu Yaxiang,Yang Yang,Liu Yuan,Chang Chao,Rong Xiaohui,Xiao Ruijuan,Zhao Junmei,Liu Yanhui,Wang Weihua,Chen Liquan,Hu Yong-Sheng
Solid-state batteries offer an alternative promising power source for electric vehicles. However, the interfacial mechanical stability of inorganic electrolytes is inferior to that of organic electrolytes. A high stack pressure (several to hundreds of megapascals) is often required to maintain intimate contact with electrodes. Here we report a class of viscoelastic inorganic glass (VIGLAS) to serve as solid electrolytes by simply replacing chlorine of tetrachloroaluminates with oxygen. The VIGLAS possesses high ionic conductivity (~1 mS cm − 1 at 30 °C) for both Li + and Na + , superior chemo-mechanical compatibility with 4.3 V cathodes and the ability to enable pressure-less Li- and Na-based solid-state batteries (<0.1 MPa). The low melting temperature (<160 °C) allows the electrolytes to efficiently infiltrate electrode materials, akin to a liquid battery. Additionally, the deformability of the electrolytes facilitates the feasibility of scale-up through the production of thin films via a rolling process.
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