COMPOSITES PART B-ENGINEERING
·
2025
·
IF 14.2
Chunmiao Liu,Yurun Feng,Haibin Sun,Qiangqiang Hu,Hui Xiao,Xue Guo,Huaiqing Zhang
The increasingly complex electromagnetic environment and escalating stealth technology requirements pose unprecedented challenges to multifunctional electromagnetic wave (EMW) absorbing materials. While significant progress has been made, existing SiBCN material systems still struggle to simultaneously achieve broadband absorption and strong attenuation. In response to this demand, we propose a Fe-Co-Ni ternary co-doping strategy from the perspective of multiple doping and magnetic medium coupling. By precisely controlling the content of magnetic elements, the synergistic effect between magnetic loss and dielectric loss is realized. The experimental results show that the minimum reflection loss (RL min ) of the optimized SiBCN/Fe-Co-Ni fibers reach -53.19 dB, and a broadband absorption of 5.36 GHz is achieved at a thickness of 1.98 mm. More importantly, the material maintains excellent stealth performance across a wide range of incident angles. Capitalizing on these outstanding properties, we have successfully designed a low radar cross-section (RCS) stealth antenna. The antenna exhibits a 27.5 dBsm RCS reduction at 9.24 GHz. This work not only clarifies the synergistic mechanism of multiple magnetic doping to regulate electromagnetic parameters, but also provides new ideas for the development of new generation of smart stealth materials and devices.
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Molecular Catalysis
·
2024
·
IF 3.9
Pengcheng Wang,Qingqing Jiang,XingYu Li,Xuedong Wang,Juncheng Hu
Generally, researchers focus on the regulation of metal sites rather than surrounding nonmetals in photothermal CO 2 hydrogenation reaction. Herein, concerning the role of non-metallic N species, a series of Co/NC-T catalysts have been fabricated via high-temperature pyrolysis of Zeolitic Imidazolate Frameworks-67. The CO 2 conversion rate shows a consistent tendency with the ratio of graphitized-N species while the product selectivity is closely related to the coordination state of Co-N x species. Co/NC-800 catalyst achieves high CO 2 conversion rate of 758 mmol g cat -1 h -1 with CH 4 selectivity of 99.6 %. After adding extra graphitized-N species, the CO 2 conversion rate could further enhance to 80.2 % for N-Co/NC-2. The role of N species in photothermal CO 2 hydrogenation reaction has been investigated in details, providing new insights for the design of metal organic frameworks derived metal/N-doped carbon catalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Shizong Wang,Jianlong Wang,Bo Lai
This study investigated the role of support-driven coordination environments in regulating peroxymonosulfate (PMS) activation by single-atom cobalt catalysts. Atomically dispersed cobalt was anchored on graphene oxide (Co/GO) and silica (Co/SiO 2 ) to compare their catalytic pathways and stability. Both catalysts enabled efficient degradation of sulfamethoxazole (SMX), achieving mineralization efficiencies of 36.4 % for Co/GO and 42.7 % for Co/SiO 2 after 60 min. Co/SiO 2 also showed superior structural stability and reduced cobalt leaching during reaction. Mechanistic studies revealed that Co/GO favored the direct formation of Co(IV)=O species, whereas Co/SiO 2 promoted surface-bound radicals, which is attributed to its higher cobalt coordination number and stronger metal-support interactions. Furthermore, both catalysts were incorporated into polyvinylidene fluoride membranes, which maintained high SMX removal efficiency during 7 days of continuous operation with real municipal wastewater. These findings underscore the crucial role of support effects in tailoring PMS activation and offer insights for designing stable single-atom catalysts for water treatment.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Shenghui Tu,Peng Zhou,Mingming Dong,Wenbin Wu,Lu Sun
In this study, an efficient and magnetic Co/CeO₂@GC catalyst was synthesized by calcination using Co@Ce-MOF as precursor. The effects of different catalyst dosages, tetracycline (TC) concentrations, pH values, peroxomonosulfate (PMS) concentrations, temperatures, and coexisting anions on the catalytic performance were investigated. Under the conditions of 20 mg catalyst and 20 mg PMS, the degradation rate of 100 mL of 40 mg/L tetracycline could reach 95.7%. The catalyst maintained effective PMS activation across a broad pH range (5-11), retaining 79.2% activity after four consecutive cycles. Electron paramagnetic resonance spectroscopy and radical quenching experiments confirmed the coexistence of both radical pathways and non-radical pathways in the system, with the latter identified as the dominant contributor to the degradation process. Reaction pathway analysis via liquid chromatography-mass spectrometry further elucidated TC transformation mechanisms under these oxidative conditions. This work proposed a MOF-derived materials as an efficient PMS activator for a simple method of TC degradation.
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Bioactive Materials
·
2025
·
IF 20.3
Yinhe Han,Lina Guo,Mingqi Wang,Zhen Cao,Xu Zheng,Xinyu Wang,Lingling Jin,Xiaoqing Wei,Xiuli Wang,Jie Zhao
Interactions among neurons, microglia, and endothelial cells (ECs) —the principal components of the neurovascular unit (NVU)—are vital for maintaining central nervous system (CNS) homeostasis and are implicated in numerous neurological disorders. However, mechanistic insights into their crosstalk remain limited due to the lack of physiologically relevant in vitro models. In this study, we present an improved 3D vascularized tri-culture model that integrates human-induced neural stem cells (hiNSCs), human vascular organoids (hVOs), and microglia within a geometrically engineered silk fibroin scaffold. This platform effectively recapitulates critical features of the native CNS microenvironment, including spatial neurovascular patterning and cell-type-specific interactions. Within this model, hVOs significantly promoted neuronal differentiation of hiNSCs, resulting in extended axonal networks and improved neurovascular alignment. Microglial effects were found to be phenotype-dependent: both resting (M0) and pro-inflammatory (M1) microglia inhibited hiNSCs differentiation and vascular development, with M1 cells exerting the strongest suppressive influence. In contrast, anti-inflammatory (M2) microglia displayed the least inhibitory effect and even modestly supported neurovascular maturation. Mechanistic studies revealed that M2 microglia cooperate with hVOs via the stromal cell-derived factor 1 (SDF-1)/C-X-C chemokine receptor type 4 (CXCR4) signaling axis to promote neuronal differentiation. To our knowledge, this represents the first demonstration of SDF-1/CXCR4-mediated immune-neurovascular interaction within a human tri-culture system. Thereafter, this 3D vascularized co-culture model provides a physiologically relevant in vitro platform to investigate neuroimmune and neurovascular interactions. It holds broad potential for mechanistic studies in neurodevelopment and neurodegeneration, drug evaluation, and the development of regenerative therapies.
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DOI
PubMed
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yulai Lin,Jun Liang,Zijun Huang,Jiaming Dong,Yongming Luo,Dedong He
Cobalt-based catalysts have garnered significant attention in propane dehydrogenation (PDH) due to their cost-effectiveness and environmental compatibility, where the properties of Co species dictate catalytic performance. However, conventional synthesis methods fail to simultaneously achieve precise encapsulation and structural stabilization of Co sites under harsh PDH conditions. Herein, we propose an innovative dual-anchoring strategy that synergizes strong electrostatic adsorption (SEA) and secondary crystallization (SC) to engineer highly stable yet active Co centers at low metal loadings (0.145 wt%). The SEA process enabled directional anchoring of Co precursors within silanol nests of dealuminated BEA zeolite, while SC treatment prevented Co aggregation. This synergistic approach yielded tetrahedral Co²⁺ (Td-Co²⁺) sites with exceptional dispersion and optimized Lewis acidity, achieving stable PDH operation for 110 hours with specific activity surpassing most reported catalysts.
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OPTICS EXPRESS
·
2025
·Vol. 33
·期 10
·21619-21633
·
IF 3.3
Suwen Xiong,Dongping Zhou,Chang Min,Xuanchu Liu,Zitong Liu,Jian Kang,Jian Kang,Enjin Liu,Tianyuan Zhou,Tianyuan Zhou,Guiming Li,Yanbin Li,Wieslaw Strek,Hao Chen,Hao Chen,Hao Chen,Le Zhang,Le Zhang,Le Zhang
High-power phosphor-converted laser lighting and laser display have gained significant attention due to their superior energy efficiency and long lifespan. However, the elevated operating temperatures under high-power excitation induce severe thermal quenching of phosphor materials, compromising the thermal stability and emission performance. To address this issue, we proposed a multi-component co-doping strategy by incorporating Ba2+/Si4+ and Sr2+/Si4+ into Ce: YAG phosphor ceramics. The optimized Sr05Ba050 sample demonstrated exceptional thermal stability, retaining 96.56% of its emission intensity at 423 K. Moreover, the thermal saturation threshold increased to 73 W/mm2, significantly surpassing that of undoped Ce: YAG. This improvement is attributed to a combination of lattice stabilization and reduced electron-phonon coupling induced by the co-doping approach. Additionally, the optimized sample achieved a luminous efficiency of radiation (LER) of 248.82 lm/W and exhibited a lower surface temperature under high-power excitation. These findings highlight the effectiveness of Ba2+/Si4+ and Sr2+/Si4+ co-doping in mitigating thermal quenching and enhancing high-temperature performance, providing valuable insights for next-generation high-power lighting and display applications.
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PubMed
高影响因子
Processes
·
2025
·Vol. 13
·期 9
·2854
·
IF 2.8
Min Wang,Chunjing Yu,Xiaoyu Zhao,Junhao Liu,Haochen Zhai,Meng Qi,Xiumei Zhang,Yinsong Liu
Microbial-enhanced oil recovery (MEOR) is a promising technology for oilfield development. To improve MEOR efficiency, two functional strains—Bacillus mucilaginosus ZZ-8 and Bacillus amyloliquefaciens ZZ-11—were isolated and purified. The growth characteristics, biosurfactant production, and crude oil emulsification performance of these strains were systematically evaluated through single-strain cultures and a co-culture system (ZZ-8: ZZ-11 = 1:1). The results demonstrated that the co-culture system exhibited superior growth and functional performance compared to monocultures. The cell-free supernatant significantly reduced oil–water interfacial tension, decreasing the contact angle from 53.56 ± 1.3° to 28.78 ± 0.82°, thereby enhancing crude oil detachment from rock surfaces and improving oil displacement efficiency. Gas chromatography (GC) analysis further confirmed the co-culture system’s pronounced degradation of long-chain alkanes (C17–C35). In oil sand washing experiments, the 1:1 mixed-strain fermentation broth achieved a crude oil elution rate of 84.39%, representing an 89.80% increase over uninoculated medium. This study not only validates the synergistic effect of the B. mucilaginosus–B. amyloliquefaciens co-culture system in enhancing oil recovery but also provides a theoretical foundation and innovative strategy for its practical application in MEOR technology.
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NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Yanqiu Liu,Mengtian Wang,Jingbo Mao,Hui Lv,Jinxia Zhou
It is of significant importance to develop cost-effective transition metal catalysts for the hydrogenation of glucose to sorbitol. While Ni-based catalysts have been frequently reported, investigations involving Co-based catalysts in this reaction remain relatively limited. Here, a Co catalyst supported on a coconut-shell activated carbon (AC) was prepared and utilized for the first time to produce sorbitol from glucose via aqueous hydrogenation. Characterization results revealed that the Co components were highly dispersed on the AC surface, forming CoO–Co polyvalent complexes incorporating oxygen vacancies and Lewis acids after calcination in N2 at 500 °C. In contrast, Ni species on the AC surface tend to aggregate into metallic Ni particles. Compared with Ni/AC, the Co/AC catalyst not only demonstrates a superior ability to generate more active H with multiple forms, but also possesses various strengths of Lewis acid sites to activate the CO bond of glucose. Consequently, the Co/AC catalyst exhibited higher activity with 100% selectivity towards sorbitol in the aqueous hydrogenation of glucose under mild conditions of 100 °C and 3 MPa H2 pressure, showcasing significant potential for the formation of sorbitol from biomass-derived glucose due to its low cost, simple preparation process, and excellent performance in hydrogenation.
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FUEL
·
2024
·
IF 6.7
Bang Wu,Xin Guo,Xulinjia Liu
The effect of calcium on the synergy evolution mechanism of Zhundong coal and polyethylene (PE) co-pyrolysis was explored by thermogravimetric (TG), fixed-bed experiments, and the ReaxFF simulation method. The weight loss characteristics of coal and PE pyrolysis, obtained through ReaxFF simulations, exhibited good agreement with TG experimental results. The distribution of coal/PE co-pyrolysis products was examined via fixed-bed fast pyrolysis experiments and Reaxff isothermal pyrolysis simulation. The results reveal that calcium substantially reduces co-pyrolysis tar while simultaneously enhancing co-pyrolysis char and gas to varying extents. Besides, the experimental temperature of 973 K and the simulated temperature of 2600 K yield the highest decrease in co-pyrolysis tar, with reductions of 9.52 % and 14.03 %, respectively. It is discovered that the addition of calcium enhances the synergy degree to 100 % between coal and PE molecules, which means that coal molecules become more firmly attached to PE molecular fragments. Additionally, calcium induces polymerization in co-pyrolysis char, causing the char molecules to become larger and increasing their average molecular weight. Ca-containing tars are rich in aliphatic hydrogens, and synergistic molecules prefer light tars, whereas Ca-free tars have a slightly broader range of aromatic hydrogens, and synergistic molecules favor heavy tars, indicating that the addition of calcium may promote the ring-opening process of coal molecules, releasing more branched-chain hydrogen. In the Ca-free and Ca-containing systems, 24.67 % and 29.51 % of the hydrogen content of the coal molecules migrated toward the co-pyrolysis tar, respectively. The proportion of coal tar fragments decreases while the proportion of PE tar and synergistic tar fragments increases in Ca-containing tar when compared to Ca-free tar, indicating that calcium promotes the polymerization of coal tar molecules with PE tar molecules, which leads to larger char molecules and smaller gas molecules.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Qian Xu,Yiyan Sun,Zhaoyang Tan,Weijuan Guo,Fujun Li,Xinran Hou,Yu Guo,Feichao Wu
Metal-organic framework (MOF) membranes, particularly cobalt-based gallate (Co-gallate) membranes, possess great potential for the efficient separation of ethylene/ethane (C 2 H 4 /C 2 H 6 ) mixtures due to their excellent sieving properties. However, the poor nucleation of MOF crystals on the substrate poses a challenge in the fabrication of high-quality Co-gallate membranes. In this work, we propose a facile and environmentally friendly approach to prepare continuous Co-gallate membranes at room temperature via magnetic field assistance. The external magnetic field, perpendicular to the substrate surface, promotes directional ion movement, improves the coordination ability of metal centers, and promotes deprotonation of ligands. These collectively facilitate the crystallization and growth of MOF crystals on the substrate by advancing MOF nucleation and enhancing nucleation density. The controllable growth of MOF membranes can also be achieved under the influence of magnetic field. The obtained Co-gallate membrane has a thickness of merely 400 nm, and exhibits superior performance in C 2 H 4 /C 2 H 6 separation. This work highlights the considerable potential of magnetic fields in the fabrication of various MOF membranes for diverse applications.
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LANGMUIR
·
2025
·
IF 3.9
Xiaohua Wang,Yanwei Li,Guang Sun,Jianliang Cao,Yan Wang
Recently, because of the urgent need for safety and health protection, there has been a growing focus on exploring effective and feasible gas sensors based on metal oxide semiconductors (MOSs) for detecting trace levels of hydrogen sulfide (H2S). In this context, a cobalt (Co) doping strategy was proposed to improve the H2S-sensitive properties of In2O3 nanomaterials, enabling them to monitor 1 ppm of H2S at a relatively lower temperature. The Co-doped In2O3 hierarchical porous nanocubes (Co–In2O3 HPNCs) were prepared through a hydrothermal route using In(OH)3 as a precursor. When utilized as a sensing material to detect H2S, the Co–In2O3 HPNCs demonstrated significant enhancements compared to pure In2O3. These enhancements include a reduction in the operating temperature (260 vs 300 °C), a significant increase in response (36.99 vs 12.28 for 20 ppm of H2S), and better selectivity (13.21 vs 3.07 times to ethanol). Even to 1 ppm of H2S, the Co–In2O3 sensor can give a response value of 1.86, highlighting its substantial potential for detecting H2S at the limit of detection (LOD) of 1 ppm. A detailed analysis of the multiple sensitization effects of Co doping reveals that these improved H2S sensing characteristics of Co–In2O3 HPNCs can be primarily traced back to three factors, namely, an increased oxygen vacancy concentration, a narrowing of the bandgap, and an upward shift of the Fermi level.
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