CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2020
·
IF 2.627
Linlin Dai,Lin Hao,Wei Kang,Wei Xu,Ning Shi,Hongyuan Wei
Aluminum powder explosion accidents occurred frequently, but the mechanism of aluminum powder explosion is unclear. Therefore, the inhibitive effect of aluminum powder explosion plays a key role. To evaluate the inhibition capacity of different kinds of carbonates and phosphates: NaH 2 PO 4 , (NH 4 ) 2 HPO 4 , NH 4 H 2 PO 4 , KHCO 3 and NaHCO 3 on aluminum deflagrations , a standard 20-L spherical chamber was used to determine the explosion severity, characterized by the maximum explosion pressure ( P max ). New parameters have been proposed: the minimum significant inert concentration (MSIC) and the minimum complete inert concentration (MCIC), which characterized the effect of inert. Experimental results showed that from the minimum significant inert concentration (MSIC) and the minimum complete inert concentration (MCIC), phosphate can have a significant inhibiting effect. 40% NaH 2 PO 4 can totally inert the aluminum explosion, and 50% (NH 4 ) 2 HPO 4 or 50% NH 4 H 2 PO 4 can also suppress the explosion. Through simulation, phosphate mainly acts via a chemical inhibition pathway, which inhibits the reaction of aluminum powder and oxygen by catalyzing the recombination of H atoms and O atoms. Carbonate performs inhibition in chemically, producing CO 2 , diluting the oxygen around the aluminum powder. Studies indicated that the explosion pressure of the mixture decreases as the concentration of inert dust increases. However, when the concentration of carbonates was low, SEEP (suppressant enhanced explosion parameter) phenomenon was found. This research work has a potential industrial application in high hazard aluminum working condition, which can help decrease the explosion pressure and reduce the accident loss.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Yanmei Zhang,Zhibin Liu,Anfu Chen,Qiankun Wang,Jingjing Zhang,Chen Zhao,Jinbao Xu,Wentao Yang,Yujiang Peng,Zhengrong Zhang
By applying a three-step anodic oxidation method followed by etching and pore widening treatment, etched micro-/submicroscale pits of ∼2 μm and ∼230 nm as well as anodized nanopores of ∼70 nm are combined to form hierarchically porous anodic aluminum oxide (HP-AAO) templates. Hierarchical micro-/submicro-/nanostructured polypropylene/graphene (HMSNS-PP/GP) superhydrophobic surfaces are laminated by a single HP-AAO template, exhibiting the similar arrangement, size, and shape with hierarchical papillae on lotus leaf surfaces. As expected, such a lotus-inspired HMSNS-PP/GP surface has an extremely small roll-off angle of ∼0.5° and a large contact angle of 155.0°, exhibiting high-efficiency self-cleaning characteristics. The HMSNS-PP/GP surface is endowed with static and dynamic wetting stabilities, which are reflected in immersion and impacting tests. After immersion, the HMSNS-PP/GP replica remains fully spotless accompanied with the ability to work under a hydrostatic pressure of ∼3626 Pa for at least 60 min. After impact, the maximum height of bounced droplets is up to 12.4 mm (i.e., 5.3 times the diameter of the droplet) at a Weber number of ∼32.12.
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2020
·
IF 2.65
Chaoyu Wang,Yishi Su,Qiubao Ouyang,Di Zhang
Graphite flakes reinforced aluminum matrix (Gr/Al) composites with high thermal conductivity , low thermal expansion and low bulk density have been widely studied. However, the application of Gr/Al composites has been limited due to the low through-plane thermal conductivity as well as poor mechanical properties . In this work, the vertically aligned graphene nanoplatelet (GNP) was initially grown on the surfaces of Gr flakes (Gr(GNP)) by chemical vapor deposition (CVD), and then the Gr(GNP)/Al composites were consolidated by vacuum hot-pressing technique. By this way, the through-plane thermal conductivity and mechanical strength are jointly enhanced. With GNP content increases up to 3.3 vol%, the through-plane thermal conductivity can be improved by 96.8% due to the establishment of through-plane heat-conducting channels. Meanwhile, because of the strengthening effect of GNP on the interface region, the flexural strength can be strongly enhanced by 122%. However, with the further increase of GNP content, the through-plane thermal conductivity and flexural strength begin to decline due to the agglomeration of GNP, but are still higher than that of Gr/Al composite.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Ruiqi Ma,Jiahui Shi,Wenxin Lin,Jianjun Chen
This paper reports a simple route to synthesize nanocrystalline silicon carbide (SiC) ceramic powders via the direct reaction of silicon powders with carbon black in a temperature-programmed muffle furnace. The mixing powders of silicon and carbon black were loaded in a alumina crucible, and then the crucible was sealed with some materials to prevent oxidization. The effect of reaction temperature on the phase of the product powders was investigated. FESEM and TEM images showed that the SiC nanopowders were spherical and had an average particle size of 48.56 nm. The sintering activities of the SiC nanopowders and commercial SiC fine powders were also investigated by hot-pressing sintering. SiC nanoceramic sintered at 1850 °C exhibited a high relative density (up to 99.2%) and a high flexural strength of 580 MPa, which exhibits better sintering activity of synthesized SiC nanopowders.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Lijie Zou,Mingyuan Ge,Jianming Bai,Chonghang Zhao,Hao Wang,Xianghui Xiao,Hui Zhong,Sanjit Ghose,Wah-Keat Lee,Qiang Shen,Fei Chen,Yu-chen Karen Chen-Wiegart
Multiscale porous metals with multiscale porosity from nanometer to micrometer have a high specific surface area and high effective diffusivity for ion transport, thereby enhancing functionalities and extending the applications of porous metals. In this study, the Cu–Fe–Al ternary system was selected as the precursor alloy to construct multiscale, bimodal porous copper by the chemical dealloying method. The effect of the phase composition and initial microstructure of precursor alloys (AlxFe75–xCu25, x = 10–60) on the three-dimensional (3D) morphology of multiscale porous metals was systematically investigated, with a goal to precisely control the multiscale porous structure. The four crystal structure phases (body-centered cubic (BCC), face-centered cubic (FCC), CsCl type (B2), and monoclinic) in precursor alloys were analyzed by synchrotron X-ray diffraction refinement. The 3D morphology, feature size distribution, and tortuosity of four representative porous Cu after dealloying AlxFe75–xCu25 (x = 10, 30, 50, and 60) precursor alloys were directly visualized and quantified via advanced synchrotron X-ray nanotomography. The relationship between the phases/crystal structures of precursor alloys and their corresponding porous morphology was established: the micron-sized pores in bimodal porous Cu are formed by dissolving the CuFeAl phase with BCC and monoclinic crystal structures, and the nano-sized pores are formed by dealloying the CuFeAl phase with FCC and B2 crystal structures. The size of the nanoporous structure depends on the ratio between the more noble and more active components in the precursor alloy, while the size of the microporous structure depends on the corresponding phase size in the precursor alloy. The tortuosity results showed that the multiscale porous structure with both nanoporosity and microporosity exhibits lower tortuosity, which will enhance transport properties for functional applications.
✓ 已验证
产品关联
DOI
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 44
·期 9
·7568-7579
·
IF 3.741
Hejing Wen,Zhongsheng Liu,Jia Qiao,Ronghua Chen,Ruijie Zhao,Jianchun Wu,Guanjun Qiao,Jianhong Yang
Summary Aluminum-air battery (AAB) is a very promising energy generator for electric vehicles (EVs) due to its high theoretical capacity and energy density, low cost, earth abundance, environmental benignity and rapid refuel. In this study, the practical energy efficiency and power density of AAB are improved by optimizing its factors, such as anode-cathode distance, operation temperature, electrolyte flow rate and the atmosphere. Under air atmosphere, the peak power density reaches 381 mW cm −2 , and the optimum output power density is 258 mW cm −2 with the anode efficiency of 90.9% and energy efficiency of 44.4%; and under pure O 2 atmosphere, the peak power density is up to 545 mW cm −2 , and the optimum output power density is 430.5 mW cm −2 with the anode efficiency of 94.2% and energy efficiency of 42.6%. These results are promising to constitute a foundation for future development of Al-air battery systems for EVs. Highlights There is rare literature on the influence of ACD and electrolyte flow rate on Al-air battery performances. The optimum parameters for Al-air flow battery are operating at 60°C with parameters of ACD of 0.5 mm, electrolyte flow rate of 15 mL min −1 under pure O 2 atmosphere. Pure O 2 atmosphere can help to keep high energy efficiency at high power density for Al-air flow battery due to the increased oxygen solubility, but slightly reduced anode efficiency. Under pure O 2 atmosphere, the peak power density is up to 545 mW cm −2 , the anode efficiency reaches 96.2%. The optimum output of power density is 430.5 mW cm −2 with the energy efficiency of 42.6%.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Jinrui Guo,Jing Tian,Jinhua Deng,Xinyu Yang,Binghui Duan,Yong Liu
Electrochemical reduction and photocatalytic reduction of CO 2 have attracted more and more attention, but they also face the problem of low utilization efficiency of electricity and solar energy. In this study, a new strategy of applying a novel Al–Sn-CNTs composite in electrochemical corrosion process was proposed to reduce CO 2 without additional electricity and light. In the Al–Sn-CNTs/CO 2 system, micro galvanic cell with Al as anode and Sn or CNTs as cathode was formed, and CO 2 was reduced to formic acid on the cathode surface . The cumulative formic acid concentration of the Al–Sn-CNTs/CO 2 system achieved 21.18 mg/L within 60 min under the conditions of initial pH 9.0, Cl − concentration 10 mmol/L, and Al–Sn-CNTs composite dosage 2 g/L. Based on the morphology, crystal structure and electrochemical test results of the Al–Sn-CNTs composite, a possible mechanism of CO 2 reduction to formic acid in the Al–Sn-CNTs/CO 2 system was proposed.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Xiaoming Wang,Qianqian Peng,Xilin Zhang,Xucheng Lv,Xin Wang,Yongzhu Fu
Refractory high-entropy alloy nanocomposites (HEA-NPs) are important class of materials with unique structure and potential applications. Although several synthetic methods have been reported, developing novel routes to prepare nanoscale HEA-based catalysts facilely is still urgently desired. This work takes advantage of confinement assisted arc and plasma shock (APS) to prepare a series of HEA-NPs by regulating the type and proportion of metal precursors. The phase constitutes and morphology of the HEA-NPs are fully characterized. The prepared refractory HEA-NPs possesses five highly dispersed metal components, including titanium (Ti), niobium (Nb), tantalum (Ta), chromium (Cr), molybdenum (Mo) and simultaneously exhibits an uniform hexagonal morphology of nanocrystals . By taking advantage of its unique corrosion resistance , TiNbTaCrMo HEA-NPs can function as a promising candidate for electrocatalytic hydrogen evolution reaction (HER) in natural seawater . And its catalytic performance after alloying is significantly enhanced compared with the elemental metal. Theoretically, the promoted HER activity can be attributed to the strong adsorption for the various metal components in HEA-NPs caused by the upshifting d -band center close to the Fermi level . Furthermore, this confinement strategy can be further extended to synthesize other HEA-NPs. Our strategy provides a novel method to synthesize various HEA-NPs for further catalytic application.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
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.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yefeng Feng,Peiyao Chen,Bingshuang Mao,Maolin Bo,Qihuang Deng
Ultrahigh dielectric constant is obtained in polymer/MXene composites due to percolation . However, huge dielectric loss is triggered owing to high leakage current . In this work, hybrid filler consisting of Ti 2 C MXene and ZrO 2 was prepared for coordinating high dielectric constant and low dielectric loss in composites. Instead of Ti 2 C percolation, Ti 2 C/ZrO 2 interface effect mildly increased dielectric constant. Ultrahigh insulation and large aspect ratio of ZrO 2 fibers significantly reduced dielectric loss. Binary polymer/Ti 2 C and ternary polymer/Ti 2 C-ZrO 2 composites were fabricated, and better overall electric traits in ternary system were found. Ti 2 C/ZrO 2 interface effect was studied using density functional theory (DFT) calculations. Ternary composite with 12 wt% filler exhibited high dielectric constant of ~40, low dielectric loss of ~0.09 at 100 Hz and high breakdown strength of ~155 MV m −1 . This work might impulse fabrication of MXene-based hybrid fillers for dielectrics.
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
·
IF 8.528
Guiyan Yang,Youyi Sun,Limin qin,Mengru Li,Kangtai Ou,Jiang Fang,Qiang Fu
Direct ink writing (DIW) is the most versatile AM technique in terms of materials development, it enables the creation of complex 3D shapes using any material by formulating a paste with controlled rheology. One of the main challenges of DIW is to design and formulate the viscoplastic and self-healing soft inks that easily flow under shear and quickly recover upon deposition. Researchers often look for flexible approaches that can be adapted to formulate printing inks with a wide range of materials. Here we report a supra-molecular interaction system composed of triethanolamine and ammonium oleate for application in DIW technology. Almost any materials (eg. rubber, plastic, ceramic, metal and composites) can be integrated into the ink system, and then can be 3D printing via shear-thinning DIW method. Furthermore, the solid contents of the ink system are higher than 80%, avoiding the formation of porous structure and dimensional changes after shaping. Present DIW method was used to construct sensors based on multi-material for application in real-time monitoring human health. This work may provide an new method to develop 3D printing materials for various practical applications.
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Xiaoqing Bin,Yapeng Tian,Yangyang Luo,Minhao Sheng,Yijia Luo,Maomao Ju,Wenxiu Que
In order to obtain high-performance flexible electrodes for supercapacitors, the nitrogen-doped delaminated-Ti 3 C 2 T x (N-d-Ti 3 C 2 T x ) decorated with MoO x nanoparticles (N-d-Ti 3 C 2 T x /MoO x ) films are prepared by a one-step solvothermal method. The N-d-Ti 3 C 2 T x nanosheets with high conductivity can facilitate electron transfer during the charge and discharge process, and the MoO x nanoparticles can contribute to high pseudocapacitance. Hence, their combination is expected to not only inhibit N-d-Ti 3 C 2 T x nanosheets from re-stacking, but also enhance the specific capacity of the whole electrode. Here, benefiting from the synergistic effect of the two components, the obtained optimal flexible and free-standing N-d-Ti 3 C 2 T x /MoO x film electrode delivers an ultrahigh capacity of 341.0 C g −1 (920.6 C cm −3 , 487.1 F g −1 , 1315.2 F cm −3 ) at the scan rate of 2 mV s −1 , and shows superior capacity retention of 99.2% after 11000 cycles at the current density of 5 A g −1 . Moreover, the flexible and free-standing N-d-Ti 3 C 2 T x /MoO x film electrode is also beneficial to promote the development of flexible supercapacitors.
✓ 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）