Particuology
·
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.
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RENEWABLE ENERGY
·
2025
·
IF 9.1
Meihong Fan,Minghao Wang,Wenbo Bi,Yuzhu Jiang,Hui Chen,Xingquan He,Qingqing Pan
The development of efficient and durable alkaline water splitting electrocatalysts is vital for advancing the renewable hydrogen economy, a key pillar of sustainable energy systems. Here, we present an entropy-driven synthesis of phase-pure cobalt boride (CoB) nanosheets by a molten salt-assisted pyrolytic method. The obtained CoB, grown in situ on carbon cloth, can serve as an efficient electrocatalyst toward the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) simultaneously. Remarkably, it requires only overpotentials of 110 mV for HER and 240 mV for OER to drive a current density of 10 mA cm −2 , respectively, addressing the critical need for cost-effective catalysts in renewable energy conversion. Experiments in combination with theoretical calculations reveal that interstitial B atoms can modulate the adsorption energy of Co sites and optimize the Co–H bond strength through the electron transfer between Co and B, thereby enhancing intrinsic HER activity. While in the OER, CoB nanosheets undergo in situ transformation into amorphous CoOOH, which acts as the highly active catalytic phase for the OER. This work not only provides a promising bifunctional electrocatalyst for alkaline water splitting but also offers fundamental insights into the catalytic mechanisms, paving the way for rational design of advanced electrocatalysts.
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FIRE AND MATERIALS
·
2025
·
IF 2.4
Yuan-Gen Lu,Bo Hao,Geng Chen,Cai-Xian Xu,Li Zhang
Tungsten delay compositions are widely utilized in ammunition, small detonators, and other devices. In this study, we first explored the changes in the burning rate of micron-sized tungsten delay compositions (W/BaCrO 4 /KClO 4 ) when achieving zero oxygen balance under different material tube walls. Subsequently, SiO 2 , CuO, BN, and shellac were added to the tungsten delay composition to investigate the burning rate variations of different samples in aluminum tubes. The experimental results reveal that the combustion rate of the tungsten delay composition decreases with an increase in the thermal conductivity of the tube wall. The content of BN exhibits a linear relationship with the combustion rate of the tungsten delay composition, the combustion rate of the tungsten delay composition decreases with the increase of the mass percentage of BN. A small amount of SiO 2 , CuO, and shellac accelerates the combustion rate of the tungsten delay composition, but the combustion rate decreases as the content of these additives increases. The conclusion of this study can provide a wider range of delay times for delay devices with significant spatial limitations.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Song Li,Chen Chen,Jingshu Wang,Xiaoqing Min,Xinyue Xu
Nano zero-valent iron (nZVI)-based advanced oxidation processes (AOPs) have broad application prospects in environmental remediation, but the surface passivation of nZVI severely limits their performance. Although carbon coating can inhibit the oxidative passivation of nZVI in air, the deposition of iron ions on its surface during the reaction still leads to its rapid deactivation. In this study, crystalline boron was introduced as a novel co-catalyst to activate peroxydisulfate (PDS) in conjunction with carbon-coated nZVI (Fe 0 @C) for the degradation of tetracycline (TC). The results showed that the Boron/Fe 0 @C/PDS system achieved complete removal of TC within 1 min. Free radical scavenging and chemical probe experiments confirmed the generation of multiple reactive oxygen species, with singlet oxygen being primarily responsible for the degradation of TC. Mechanism investigations revealed that crystalline boron can accelerate the redox cycle of iron ions by donating electrons, thereby inhibiting the deposition of iron ions on the Fe 0 @C surface and achieving the stable release of ferrous ions and the continuous activation of PDS. Furthermore, crystalline boron gradually undergoes surface oxidation during the electron donation process, but its surface self-cleaning effect can continuously expose new active sites. The synergistic effect of crystalline boron and carbon coating prevents passivation of nZVI throughout its lifecycle, thereby ensuring excellent catalytic efficiency and long-term stability. This study provides a practical anti-passivation strategy and offers new insights into the rational design of nZVI-based AOPs.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guoqing Wang,Pengxing Cui,Gang Qin,Longfei Jiang,Fengjun Zhang,Xiaobing Zhou
In this study, a purity of up to 98.36 wt. % GdB 6 with screw dislocation growth morphology were successfully fabricated using an in-situ reaction approach. The terraced-like structure of the GdB 6 enhanced the interfacial polarization and multiple interface scattering of the electromagnetic waves. As a result, the as-obtained high purity GdB 6 powder presented superior electromagnetic wave absorption performance. The minimum reflection loss value can be −49.24 dB at the frequency of 13.12 GHz with a thin matching thickness of 1.44 mm. In addition, the widest effective absorption bandwidth can be up to ∼4 GHz (14–18 GHz) with a thin matching thickness of 1.25 mm. The remarkable electromagnetic wave absorption performance of GdB 6 ceramics could be attributed to conductance loss and polarization loss enhanced by the screw dislocation growth defects, as well as synergistic effects with magnetic loss. The as-obtained GdB 6 with synergistic dielectric loss and magnetic loss is to be a novel single-phase with excellent electromagnetic wave absorbing material, which will pave the way on the investigation of rare earth hexaborides for the ultra-high temperature environment applications.
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Materials
·
2025
·Vol. 18
·期 9
·2117
·
IF 3.2
Jiaxiong Li,Muqing Hou,Haiyuan Chen,Huan Yu,Jixue Zhou,Jianhua Wu,Xitao Wang
Al/diamond composites are considered a new generation of potential thermal management materials. In this study, the uniform B coating on the surface of diamond particles was prepared by the vacuum thermal diffusion method. Subsequently, Al matrix composites reinforced with B-coated diamond particles were produced by the gas pressure infiltration method. The plating time was varied from 0 to 120 min to investigate the effect of B coating on the thermal conductivity and thermal expansion of the Al/B-diamond composites. The thermal conductivity for the Al/B-diamond composites increased from 422 W/m·K to 562 W/m·K with prolonged plating time from 0 to 90 min. Correspondingly, the coefficient of thermal expansion was tailored from 7.0 × 10−6/K to 5.8 × 10−6/K. The enhanced thermal conductivity and decreased coefficient of thermal expansion were attributed to strong interfacial bonding in Al/B-diamond composites. The results indicate that the appropriate thickness of B coating is a viable method to improve interfacial bonding between the Al matrix and B-coated diamond particles.
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Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Zhen-Cheng Wu,Fang-Xu Tian,Rui Xiao,Mao-Yin Ran,Wenlong Liu,Wen-Tong Chen,Sheng-Ping Guo
The study of infrared nonlinear optical (NLO) materials with wide band gaps and high laser induced damage thresholds (LIDTs) is an urgent and challenging topic. Here, we report the NLO properties of CsRESiS4 (RE = Sm, Gd–Ho), which were synthesized by the reactive flux CsCl assisted RExOy–B–S routine. The structure of CsRESiS4, [CsS7] pentagonal bipyramids are orderly arranged to populate the interlayer space created by [RES7] monocapped triangular prisms consolidated [SiS4] tetrahedra. They all exhibit wide band gaps of 3.51–3.95 eV, high LIDTs of 3.6–5.5 × AGS, and NLO activity, with CsHoSiS4 possessing the largest band gap among rare-earth chalcogenides. The theoretical calculation results indicate that [RES7] monocapped triangular prisms are the main source of NLO activity and have a wide band gap. This work provides an effective case for exploring wide band gap infrared NLO materials.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Ningqiang Shi,Mingyang Wu,Zhijun Li,Jinchang Meng,Chuncheng Ban,Luochen Qu,Mingyu Zhang,Ling Li
Boron nitride nanotubes (BNNTs) offer remarkable potential for thermal management and optoelectronic applications due to their high aspect ratio, excellent thermal conductivity, electrical insulation, and mechanical strength. However, achieving high-quality, well-aligned BNNTs (ABNNTs) remains a critical challenge, largely due to limited understanding of their growth mechanism. Here, we develop a three-dimensional flow–force–thermal coupling model that reveals how gas convection and vertical temperature gradients synergistically drive the aligned growth of ABNNTs. We elucidate the essential roles of thermophoretic and shear forces in guiding nanotube orientation. Based on this insight, a synthesis strategy integrating computational fluid dynamics and thermo-solid coupling analysis is proposed and experimentally validated. The resulting ABNNTs exhibit high crystallinity, low defect density, and near-ideal BN stoichiometry. When applied as thermal interface materials (TIMs) in LED devices, ABNNTs reduce the core temperature by approximately 17.9 °C and enhance thermal dissipation efficiency by ∼20.7 %, outperforming disordered BNNTs and commercial TIMs. This work not only clarifies the fundamental mechanism underlying ABNNT alignment, but also establishes a rational design strategy for advanced thermally conductive materials and their integration into high-performance electronic systems.
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高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Dongliang Chu,Weiguo Sun,Longsuo Guo,Xiaojun Yang
We obtained a series of B 6 O, B 4 C, ZrB 2 crystals at a pressure of 6 GPa and temperature of 1673–1973 K. These crystals were characterized by XRD and SEM. At a pressure of 6 GPa, the minimum synthesis temperature for B 6 O is 1673 K. The grain size of B 6 O in all the samples remained consistent at around 30–50 nm, with a uniform distribution in each sample. The bonding force between B 6 O grains is weak, and the B 6 O grain size remains relatively stable, showing minimal change with increasing temperature and time. In the sample synthesized at 1973 K, B 6 O icosahedra (multiply twinned particles, MTPs) with a diameter of 12 μm, B 4 C particles with a diameter of 25 μm, and flaky ZrB 2 were observed. We conducted theoretical calculations on B 6 O and B 4 C using density functional theory (DFT).
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2025
·
IF 2
Xiaolan Song,Jie Wang,Yi Wang,Chongwei An,Fengsheng Li
By using microfluidic technology and controlling the difference in flow rate between the oil and water phases, highly spherical nB/nitrocellulose (NC)/1,2,3,4-butanetetraol tetranitrate (ETN) microspheres with a size of approximately 60 µm were prepared, and their structures and elements were characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), x-ray diffraction (XRD), infrared (IR), x-ray photoelectron spectroscopy (XPS), and laser microscopy. The catalytic effect of the microspheres on the thermal decomposition of ammonium perchlorate (AP)/DAP-4 was studied in detail using thermogravimetry and differential scanning calorimetry (TG–DSC) testing and burst point testing. The combustion performance of AP/perchloric acid-triethylenediamine ammonium (DAP-4) before and after the addition of nB/NC/ETN microspheres was studied using a high-speed camera, a high-sensitivity IR camera, and a combustion heat measurement instrument. In addition, this study investigated the combustion mechanism of nB/NC/ETN microspheres. After the introduction of nB/NC/ETN microspheres, the thermal decomposition peak temperature of AP/DAP-4 decreased by approximately 30°C, the thermal decomposition activation energy decreased by nearly 150 kJ/mol, and the reaction rate constant increased from 0.37 to 0.77. The results of the combustion experiments revealed that after the addition of nB/NC/ETN microspheres, the combustion of AP/DAP-4 became more intense, and the pressurization rate increased sharply from 1.11 to 6.65 MPa/s. As the burning rate increased, the maximum combustion temperature increased from 1728°C to 1902°C, and the combustion heat increased from −6989 to −13 551 kJ/kg. Moreover, the experimental results indicated that compared with microboron (μB)-based sample, the nanoboron (nB) sample has higher burning rate and combustion efficiency. Therefore, all the experiments simultaneously demonstrated that nB/NC/ETN significantly promoted the thermolysis and combustion of AP/DAP-4. Therefore, the results of this work indicated that nB/NC/ETN microspheres may have potential applications in hypersonic ramjet engines.
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Inorganics
·
2025
·Vol. 13
·期 12
·402
·
IF 3
Xiangqi Lu,Hongbo Chen,Yufei Gu,Jun-Liang Chen,Jie Gao,Kun Hu,Weijiang Gan,Zhongmin Wang,Huajun Lai,Lei Miao
Silicon-based thermoelectric (TE) materials are demonstrating advanced capacity in environmental waste heat recovery. However, intrinsically high lattice thermal conductivity hinders the improvement of TE conversion efficiency. In the present work, a study of B4C composite for in situ nano-inclusions was carried out to enhance the TE properties of p-type Si80Ge20materials. During sintering, B4C was demonstrated to form the SiC and B-rich ternary with a SiGe-based matrix, and the in situ formation of diverse nano-inclusions and the B dopant significantly reduced lattice thermal conductivity without deteriorating power factor (PF), weakening the coupling relationship between thermal and electrical transport properties to a certain extent. The carrier concentration of SiGe alloy samples was significantly increased, resulting in a 7.8% enhancement ofPFfor Si80Ge20B0.5-(B4C)0.3at 873 K, while a low lattice thermal conductivity of 0.69 W m−1K−1is achieved. The optimalZTis 1.08, which increased ~50% compared to the pristine sample, and an excellent averageZTavgof 0.62 is obtained among recent p-type SiGe-based TE materials’ works. Our research provides a new perspective for the optimization and practical application of p-type silicon germanium TE materials.
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Journal of Energy Chemistry
·
2024
·
IF 14
Fuxi Liu,Qing Liang,Zhenyu Li,Meiqi Liu,Nailin Yue,Zizhun Wang,Xu Zou,Wei Zhang
Electrocatalysts with high activity and long-term durability are vital toward large-scale hydrogen production from electrocatalytic water splitting. Here, the self-supported electrode (FeO x H y @Ni 3 B/NF) with hierarchical heterostructure was simply prepared by using Ni 3 B chunks grown on nickel foam as substrate to in situ form vertical FeO x H y nanosheets. Such hybrid shows efficient oxygen evolution reaction activity with overpotentials as low as 267 and 249 mV at 100 mA cm −2 in 1 M KOH solution and 30 wt% KOH solution, respectively. Meanwhile, it also exhibits excellent catalytic stability, sustaining catalysis at 500 mA cm −2 in 1 M KOH solution for 200 h, and even for 200 h at 1000 mA cm −2 in 30 wt% KOH solution. Further experimental results reveal that the FeO x H y @Ni 3 B/NF is endowed with superhydrophilic and superaerophobic surface properties, which not only provide more mass transport channels, as well as facilitated the diffusion of reaction intermediates and gas bubbles. Also, it holds faster reaction kinetics, more accessible active sites and accelerated electron transfer rates due to strong synergistic interactions at the heterogeneous interface.
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