Particuology
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2024
·
IF 4.1
Chen Dong,Yi Wang,Kanghui Jia,Dan Song,Xiaolan Song,Chongwei An
Boron nanoparticles , with their remarkably high gravimetric and volumetric calorific values, emerge as the most promising fuel in energetic fields. However, challenges such as susceptibility to oxidation , high ignition temperature , and low combustion efficiency have constrained their further applications. In this study, we fabricated high explosives based nano-boron microspheres with uniform size using the electrostatic spray method, in which the boron nanoparticles and high explosives (CL-20 or PETN) are closely bonded together by fluorinated polymer (F 2602 ) and evenly distributed. The results indicated that the microspheres exhibited high sphericity and showed an enhanced antioxidant capability. The addition of high-energy explosives not only reduced the thermal oxidation temperature of nano-boron powder within the microspheres but also significantly enhanced the pressurization rate. Additionally, the microspheres with added high-energy explosives released more energy during the combustion process. Compared to physically mixed samples, electrostatically sprayed microspheres with a uniform microstructure still exhibited higher reactivity. Therefore, the design and synthesis of microspheres with controllable structures using the electrostatic spray method show promising application prospects.
研究领域:
材料科学
·
能源化学
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Yonghui Yu,Jie Wei,Xianghui Yan,Yuhong Chen,Biao Zhang,Yujin Wang,Feng Ye,Limeng Liu
TaB 2 –SiC composites with 0–20 wt% SiC contents were prepared by reaction hot pressing using Ta, B and SiC powders as starting materials. Densification, constituent phases, microstructure and mechanical properties, namely Vickers hardness, fracture toughness and flexure strength, were evaluated by means of inspection of sintering shrinkage, density measurement, XRD, SEM, TEM, HRTEM, EDS, SAED, indentation and three-point bending tests. Phase formation, including dominant (TaB 2 , SiC) and minor (TaC, glassy SiO 2 ) phases, was checked by thermodynamic assessment relevant with Ta 2 O 5 and B 2 O 3 impurities introduced into the reaction system by the starting powders. The results showed that mixtures of Ta, B and SiC powders would initiate self-propagating combustion synthesis (SPCS) at about 900 °C; a transient hold at 800 °C for 1 h could suppress this reaction. Volatilization of B 2 O 3 impurity in association with local high temperature due to SPCS helped reduce the TaC and glassy SiO 2 minor phase formation. TaB 2 –SiC composites could reach 99 % relative densities with 3 wt% SiC addition and above. Compositions with <7.5 wt% SiC additions showed uniform dispersion of SiC particles at multi-TaB 2 grain junctions while compositions with higher SiC content revealed SiC segregation. Bending strength of 503 MPa and fracture toughness of 6.69 MPa⋅m 1/2 could be reached with 7.5–20 wt% SiC addition.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qinghao Yang,Xingjiang Hua,Chaofan Quan,Hua Wang,Li Wang,Hairui Xing,Junzhou Yang,Qiang Wang,Ping Hu,Kuaishe Wang
Molybdenum alloy plates were prepared via powder metallurgy and the rolling process, and their microstructure and mechanical properties at room temperature were characterized. The results indicate that the grain size of the molybdenum alloy is significantly refined as the boron content increases. The Mo-1.0B alloy exhibited substantial grain refinement, with an average grain size of 7.12 μm representing a 42.6% reduction compared to 12.41 μm of undoped molybdenum. Microstructure and EBSD analyses demonstrate that boron doping effectively inhibited the recrystallization process in the Mo alloy. Notably, compared to previously studied molybdenum alloys, the newly developed alloys exhibit an unprecedented breakthrough in both strength and plasticity: the ultimate tensile strength of the rolled Mo-1.0B alloy plate reaches 1016.6 MPa, with a total elongation of 8.6%, significantly surpassing that of the 916.3 MPa and 6.5% of pure molybdenum. After annealing at 1200 ℃, the ultimate tensile strength of the rolled Mo-1.0B alloy plate reaches 532.5 MPa, with a total elongation of 67.4%, markedly higher than that of the 505.3 MPa and 46.9% of pure molybdenum. The excellent mechanical properties are primarily attributed to solid solution strengthening, dislocation strengthening, and grain boundary strengthening of Mo-B. Additionally, a quantitative strengthening model correlating strength, dislocation density, solid solution strengthening, and grain size was established, clarifying the strengthening mechanism.
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DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Xianxian Sheng,Tianliang Wang,Guilu Zeng,Xiang Zhang,Mudassir Habib,Shuguang Lyu
In the advanced oxidation process (AOPs) induced by sodium percarbonate (SPC), reactive oxygen species (ROS) can be scavenged by a large amount of dissolved Fe(II) released within a short time. To address this issue, a slow-release Fe(II) process is proposed in this study, thereby enhancing the degradation of contaminants. SPC/Fe(III)/amorphous boron (B) and SPC/Fe(III)/citric acid (CA) procedures were employed to remove polycyclic aromatic hydrocarbons (PAHs), with B as the reductant and CA as the chelator. Fluoranthene (FLT) removal in SPC/Fe(III)/B process contributed to HO•, while HO• and O 2 − • were responsible for FLT degradation via SPC/Fe(III)/CA system. SPC/Fe(III)/CA system exhibits more adaptability to intricate water quality circumstances compared to SPC/Fe(III)/B system. The bio-toxicity of FLT and their degradation intermediates was evaluated via the Toxicity Estimation Software Tool (T.E.S.T.), revealing a reduction in oral rat LD50, developmental toxicity, mutagenicity, and bioconcentration factor of the degradation intermediates relative to FLT. Both amorphous B- or CA-assisted SPC/Fe(III) processes were shown to be eco-friendly through luminosity inhibition tests with Vibrio fischeri . Experiments on soil slurry revealed that SPC/Fe(III)/CA system was feasible for the removal of complex PAHs, directing the SPC-induced AOPs process for the remediation of PAHs contaminated soils and groundwater.
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高影响因子
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Bowen Dai,Yiran Zhao,Zhendong Huang,Xiangling Chen,Qiang Liu,Wei Huang,Hongbing Chen
Rubber materials would adhere to metal substrates when compressed together for a certain time. The specific mechanisms of such adhesion are still unclear. In this work, silicone rubbers and metals with various chemical structures were utilized to reveal the gecko-like adhesion mechanism. The Sum Frequency Generation Vibrational Spectroscopy (SFG) and in-situ Diffuse Reflaxions Infrared Fourier Transformations Spectroscopy (DRIFTS) results demonstrated that van der Waals forces are the inevitable interactions at any silicone rubber/metal interface. Hydrogen bond interactions can be observed when the interface is rich in hydroxyl groups, contributing to higher adhesion strength and rate. The interactions could be affected once containing other groups (e.g. large steric hindrance groups or certain inorganic fillers) in the chemical structure. This work could provide inspirations for designing the materials with adjustable adhesion ability or intelligent adhesion system.
研究领域:
材料科学
·
表面化学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Guoqing Wang,Pengxing Cui,Longfei Jiang,Lianghao Chen,Peter Tatarko,Fengjun Zhang,Xiaobing Zhou
In this study, a highly dense GdB 6 bulk ceramic material was fabricated using one-step in-situ reaction spark plasma sintering technology. The sample with a relative density of 96.7 % and a purity of 96.9 wt% was successfully obtained by sintering at 1800 °C for 30 min under a uniaxial pressure of 50 MPa. The Vickers hardness , elastic modulus and fracture toughness of the as-obtained GdB 6 bulk ceramics were 18.9 GPa, 209 GPa and 1.6 MPa·m 1/2 , respectively. The thermal conductivity of GdB 6 at room temperature was 28.68 W·m −1 ·K −1 , 70 % of which was mainly attributed to phonon vibration, while the remaining 30 % to the electrical thermal conductivity. In addition, the as-obtained GdB 6 ceramics showed no phase transformation after heat treatment at a relatively high temperature of 2100 °C for 20 min in Ar atmosphere. The highly covalent octahedral boron framework played a critical role in maintaining the phase stability of the GdB 6 crystal lattice . This suggested that GdB 6 ceramics could be used as potential ultra-high temperature ceramics for aerospace applications and high-power vacuum electronic devices operated at high temperatures.
研究领域:
材料科学
·
航空航天工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Guangyao Yang,Weiliang Peng,Zhipeng Chen,Shaobo Li,Qiying Han,Renzong Hu,Bin Yuan
Nickel–molybdenum–boron (Ni–Mo–B)-based catalysts with biphasic interfaces are highly advantageous in bifunctional electrocatalytic activity in alkaline water-splitting. However, it remains an ongoing challenge to obtain porous Ni–Mo alloy substrates that provide stable adhesion to catalysts, ensuring the long-term performance of bifunctional self-supporting electrodes at a high current density. Herein, a porous Ni–Mo alloy substrate was effectively obtained by a cost-effective dealloying process on a commercial Ni–Mo alloy with high-energy crystal planes. Subsequently, the Mo2NiB2/Ni3B bifunctional catalyst was in situ synthesized on this substrate via boriding heat treatment, resulting in outstanding catalytic activity and stability. Density functional theory (DFT) calculations reveal that the abundant biphasic interfaces and surface-reconstructed sites of the Mo2NiB2/Ni3B catalyst can decrease the energy barriers for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Thus, the designed self-supporting electrodes show bifunctional catalytic activity with overpotentials of 151 mV for HER and 260 mV for OER at a current density of 10 mA cm–2. Markedly, the assembled water electrolyzer can be driven up to 10 mA cm–2 at 1.64 V and maintain catalytic activity at a high current density of 1000 mA cm–2 for 100 h. The new strategy is expected to provide a low-cost scheme for designing self-supporting bifunctional electrodes with high activity and excellent stability and contribute to the development of hydrogen energy technology.
研究领域:
材料科学
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电化学
·
能源技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2024
·
IF 2.8
Jiaqi Li,N. Daghbouj,Xiaoxun He,Ke Chen,Xingzhong Cao,Shuoxue Jin,Jun Li,Haiyuan Wei,Junjun Zhou,Tongmin Zhang,Shuai Xu,Fangfang Ge,J. Duchoň,A.T. AlMotasem,T. Polcar,Bingsheng Li
Layered carbides and borides, blending ceramic and metallic characteristics, present compelling prospects for future nuclear reactor applications due to their complex nanolaminate crystal structure. To explore the behavior of Fe 2 AlB 2 under different conditions, helium irradiation is conducted across saturation fluences and under different annealing and irradiation temperatures. Room temperature (RT) irradiation causes some changes: a-lattice expands 0.3 %, c-lattice contracts 0.07 %, and an embedded amorphous layer into the matrix is formed. 400 °C annealing keeps an amorphous structure whereas 800 °C annealing fully recrystallizes with bubble growth. Increasing the irradiation temperature to 400 °C with the same fluence, smaller bubbles form without an amorphous layer, indicating defect recombination depends on helium attachment to vacancies. Under irradiation at 700 °C, faceted bubbles develop exclusively within Fe 2 AlB 2 , with no such bubbles in Al 2 O 3 . These faceted bubbles align themselves along (110) planes. Simultaneously, irradiation prompts tangled dislocations within the damaged layer, fostering the congregation of polygonal bubbles along grain boundaries (GBs) and creating denuded areas at GBs. Fe 2 AlB 2 demonstrates remarkable oxidation resistance under high-temperature irradiation, maintaining surface stability without the cracks seen in ion-irradiated Ti 3 SiC 2 and Ti 2 AlC at RT. Fe 2 AlB 2 shows promise for use in reactors operating at temperatures above 500 °C due to its resilience to irradiation. Further investigation is warranted for its application in reactors operating in environments exceeding this threshold temperature.
研究领域:
材料科学
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核能工程
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DOI
高影响因子
SOLID STATE COMMUNICATIONS
·
2021
·
IF 1.804
Wenjia Liang,Lu Zhang,Xiaojun Xiang,Junpu Wang,Liu Zhang,Binbin Wu,Yipeng Wang,Yan Zeng,Shixue Guan,Qiqi Tang,Fang Peng
Single-crystal boron phosphide (BP), a high-temperature semiconductor, is prepared by a eutectic melting method. Large BP single crystals (>1 mm) are synthesized at high pressure and high temperature (5.0 GPa and 3000 °C). Their growth mechanism is analyzed. Ultraviolet–visible spectroscopy and thermogravimetry/differential thermal analysis show that BP is an indirect semiconductor (2.01 eV) and has excellent thermal stability (>1200 °C). Success in the synthesis of good BP crystals offers a huge opportunity to determine their intrinsic properties and will also stimulate more research on their performance as semiconductors.
研究领域:
材料科学
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半导体物理
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jian Meng Jiao,Kai Tang,Jafar Safarian,Bettina Grorud,Kathrine Sellevoll,Merete Tangstad
Si 3 N 4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si 3 N 4 were investigated in an induction furnace at 1750 °C with the B addition of 2, 5, 8, and 11 mass %, respectively. Moreover, the wettability property of the Si-3.25B alloy (mass %) on Si 3 N 4 substrate was examined at temperatures up to 1400 °C. The cross-sectional images and micro-analyses showed that BN precipitates were produced in the Si–B alloys and a BN layer was formed at the interface between the Si–B alloys and Si 3 N 4 . However, the amount of BN precipitates was negligible. Next, the equilibrium contact angle of liquid Si-3.25B alloy on Si 3 N 4 substrate was determined to be 134 ± 1°, which indicates non-wetting behavior. The above results support that Si 3 N 4 is a desirable refractory material for the high temperature thermal energy storage system.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2021
·Vol. 107
·期 1
·147-153
·
IF 2.151
Zhang Rui,Dong Pengyue,Sun Hongwen,Liu Chunguang
To investigate the combined effects of excess boron (B) and high salinity on the growth of freshwater algal species, Chlorella vulgaris and Microcystis aeruginosa were cultured in the medium with different B and salinities. The results show that high levels of B and salinity inhibited the growth of the two algal species. For C. vulgaris , low levels of B can alleviate the growth inhibition induced by salinity, and low levels of salinity can also relieve the growth inhibition induced by B. In contrast, high levels of salinity have little effect on B toxicity, while high levels of B aggravate salinity stress. For M. aeruginosa , salinity aggravates B toxicity, regardless of salinity levels. B supply worsens salinity stress on M. aeruginosa , regardless of supply doses. These results suggest that it may be possible to control algal bloom by regulating B or salinities.
研究领域:
生态学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 27
·2101820
·
IF 18.808
Jihong Li,Yipu Liu,Hui Chen,Zhankai Zhang,Xiaoxin Zou
The realization of seawater electrolysis requires high-performing anode materials that should possess good catalytic activity, stability, and specificity for the oxygen evolution reaction (OER) as well as high resistance toward chloride corrosion. Herein, the design of a multilayered oxygen-evolution electrode is reported to meet the multiple needs of anode material for saline water splitting. The multilayered electrode is synthesized through direct thermal boronization of commercially available NiFe alloy plate with boron powder, followed by electrochemical oxidation. And this electrode is composed of the surface oxidized NiFeBx alloy layer, the NiFeBx alloy interlayer, and the NiFe alloy substrate. The boron species are present in the form of metaborate in the outermost oxidized NiFeBx layer, and their existence is conductive to the generation and stabilization of the catalytic active phase γ-(Ni,Fe)OOH. The introduction of NiFeBx interlayer effectively prevents the excessive oxidative corrosion of the anode material in the electrolyte containing chloride ions.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
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