RARE METALS
·
2024
·
IF 9.6
Zhou Xiao-He,Mo Min-Hua,Chen Zi-Wei,Liu Wen-Jing,Zhang Yan-Li,Pathak Janak L.,Wang Li-Jing,Liu Chang,Shao Long-Quan,Chen Liang-Jiao
Promotion of angiogenesis is crucial for bone tissue repair, and the poor activity of angiogenic cells and growth factors is the main problem in angiogenesis. New proangiogenic nanomaterials are urgently needed to be a promising strategy for this issue. Nb promotes bone formation and fracture healing, possibly by increasing vascular endothelial growth factor (VEGF) production. Nanoniobium particles (nNb) may promote angiogenesis. However, the effect of nNb on angiogenesis is unclear, limiting its application. This study confirmed that nNb significantly promoted angiogenesis. nNb increased and Ras-related C3 botulinum toxin substrate (Rac) family small guanosine triphosphatase (GTPase) 1 (Rac1) expression, inducing F-actin aggregation at the front edge of cells and the formation of pseudopodia to mediate cell migration, further promoting angiogenesis. We discovered that cyclin-dependent kinase-like 5 (CDKL5) is a new signaling molecule that activates Rac1. V-ets erythroblastosis virus E26 oncogene homolog (ETS) domain-containing protein (ELK1), regulating CDKL5 and Rac1, plays an upstream regulatory role. When ELK1 was inhibited, CDKL5 and Rac1 levels were decreased. ELK1, CDKL5 or Rac1 are effective regulatory targets of angiogenesis. Inhibiting expression of ELK1, CDKL5 or Rac1 decreased angiogenesis. Thus, nNb has good angiogenic effects. The ELK1-CDKL5-Rac1 signaling pathway regulates the migration of endothelial cells to promote angiogenesis. nNb can be used in bone tissue engineering as a new nanomaterial, and it will promote the development of a new strategy for tissue engineering. Graphical abstract
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高影响因子
TALANTA
·
2011
·
IF 3.722
Jiayue Ma,Yunsong Zhang,Xiaohua Zhang,Gangbing Zhu,Bo Liu,Jinhua Chen
A sensitive electrochemical sensor for nitrobenzene (NB) detection has been developed based on macro-/meso-porous carbon materials (MMPCMs). MMPCMs were prepared by pyrolysis of the ionic-liquid ([AEIm]BF 4 ) polymer (PIL) pre-wrapped onto SiO 2 microspheres and then removal of the silica core. The morphology and structure of MMPCMs were characterized by scanning electron microscopy (SEM) and nitrogen adsorption/desorption measurements. Owing to the macro-/meso-porous structure, large specific surface area and accumulation effect of MMPCMs, the MMPCMs modified glassy carbon (MMPCMs/GC) electrode has high catalytic activity towards the reduction of NB. At the optimal pH value and accumulation time, the resulted electrochemical sensor shows satisfactory analytical performance for NB detection. The linear response range is from 0.2 μM to 40 μM and the detection limit is 8 nM based on the signal-to-noise ratio of 3. Moreover, the MMPCMs/GC electrode exhibits good stability and reproducibility, and acceptable selectivity.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Shuaiqian Wang,Baoji Miao,Muhammad Shahid Nadeem,Huaizhi He,Yao Zhao,Muhammad Yasir,Qiuling Chen,Guoqin Liu,Jinbo Bai
This study successfully prepared a novel high-entropy MAX phase (Ti 1/4 V 1/4 Zr 1/4 Nb 1/4 ) 2 AlC and conducted a comprehensive investigation of its microwave absorption performance. The material was synthesized using a pressure less sintering method, and by optimizing the selection of raw materials and synthesis processes, high purity, and excellent microwave absorption performance were achieved. The composition, structure, morphology, and electromagnetic parameters of the material were analyzed in detail using characterization methods such as XRD, SEM, EDS, TEM, XPS, and vector network analyzer (VNA). Experimental results exhibit that (Ti 1/4 V 1/4 Zr 1/4 Nb 1/4 ) 2 AlC can achieve a lowest RL of -62.56 dB at a thickness of 2.25 mm with frequency of 13.26 GHz, demonstrating outstanding microwave absorption capabilities. The study also explored the microwave absorption mechanisms of grown material, including conductivity, dipole polarization relaxation processes, internal lattice defects, and magnetic loss. This research not only delivers new approaches and development of effective microwave absorption materials but also lays the foundation for subsequent studies on MXene and more multi-element high-entropy MAX phase materials.
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TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
·
2025
·Vol. 78
·期 4
·1-11
·
IF 1.6
Chen Qijie,Liu Chencheng,Han Jiaxin,Cheng Yong,Chen Qingyun,Xiong Zhonggang
A new high-entropy MAX phase (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC was successfully synthesized at 1500 ℃ by nonpressure sintering one-step solid phase reaction method. The microstructure, crystal structure and oxidation behavior of high-entropy (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC MAX phase were investigated. Using thermogravimetry analysis to investigate the oxidative stability of (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 ) 2 AlC in air environment at high temperature from 0 to 1000 °C, there is no volume change from 0 to 400 °C, and the morphology still exhibits a typical layered structure, demonstrating thermal stability. Oxidation rate gradually decreases with the increase in temperature, and the K p3 value decreases to 0.86 × 10 –4 kg 2 m −4 s 2 at 1000 ℃. The microscopic morphology analysis at different temperatures shows that the surface defects of the matrix gradually form under high-temperature conditions, in which the formation of carbide and Al 2 O 3 layers hinds the further oxidation of the sample. The research provides a reference for the synthesis and thermal stability of new two-dimensional layered high-entropy MAX ceramics.
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Advanced Powder Materials
·
2024
·
IF 28.6
Ziming Ye,Yi Zeng,Xiang Xiong,Sen Gao,Chen Shen,Shiyan Chen,Tianxing Jiang,Ge Yang
Multiphase design is a promising approach to achieve superior ablation resistance of multicomponent ultra-high temperature ceramic (UHTC), while understanding the ablation mechanism is the foundation. Here, through investigating a three-phase multicomponent ceramic consisting of Hf-rich carbide, Nb-rich carbide, and Zr-rich silicide phases, we report a newly discovered solid-state reaction process among multiphase multicomponent ceramic during ablation. It was found that this solid-state reaction occurred in the matrix/oxide scale interface region. In this process, metal cations are counter-diffused between the multicomponent phases, thereby resulting in their composition evolution, which allows the multicomponent phases to exist stably under a higher oxygen partial pressure, leading to the improvement of thermodynamic stability of three-phase multicomponent ceramic. Additionally, this solid-state reaction process appears synergistic with the preferential oxidation behavior among the oxide scale in enhancing the ablation performance.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Si Guo,Chao Deng,Gang Shi,Dawei Wang,Likui Wang
MXenes are emerging as highly promising materials for pseudocapacitive applications, offering exceptionally high specific capacitance. To date, over 30 distinct MXene compositions and nearly 20 solid solutions have been synthesized in the lab. However, research predominantly centers on Ti3C2Tx and a handful of other single-metal MXenes, with scant attention paid to solid-solution MXenes. Herein, a series of solid solution MAX phases (Nb1−yTiy)4AlC3 and corresponding (Nb1−yTiy)4C3Tx MXenes have been synthesized. The maximum proportion of Ti that can be incorporated into the M site has been examined. We found that the rate performance of MXenes improves with increasing Ti content. Especially, (Nb0.7Ti0.3)4C3Tx and (Nb0.6Ti0.4)4C3Tx retain 62.92% and 68.38% of their capacitances, when the scan rate is increased from 5 mV s−1 to 1000 mV s−1, respectively, compared to Nb4C3Tx's 13.88% retention. (Nb0.7Ti0.3)4C3Tx shows a specific capacitance of 311.06 F g−1 under a current density of 1 A g−1 and good cycling stability. This research demonstrates that the electrochemical characteristics of (Nb1−yTiy)4C3Tx solid solution MXenes can be manipulated by adjusting the ratio of transition metals.
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高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Tianle Zeng,Zishen Zhao,Kun Ye,Zhipeng Yu,Junxin Yan,Yuxuan Zeng,Weiming Lv,Lianbo Guo,Chun Zhao,Anmin Nie,Zhongming Zeng,Zhongyuan Liu
Neuromorphic computing presents a promising solution for the von Neumann bottleneck, enabling energy-efficient and intelligent sensing platforms. Although 2D materials are ideal for bioinspired neuromorphic devices, achieving multifunctional synaptic operations with simple configurations and linear weight updates remains challenging. Inspired by biological axons, the in-plane anisotropy of 2D Nb 2 GeTe 4 is exploited to develop dual electronic-optical synaptic devices. The device exhibits anisotropic hole mobilities (137.97 cm 2 V −1 s −1 along the a -axis and 78.29 cm 2 V −1 s −1 along the b -axis) and a wavelength-dependent photoresponse. This enables directional synaptic plasticity under electrical-optical co-stimulation, achieving 98.3% accuracy along the a -axis and 88.3% along the b -axis in adaptive image processing. A machine vision system with 89.6% object recognition accuracy and an intelligent vehicle navigation platform with 90.2% decision-making accuracy is also demonstrated. The integration of anisotropic transport and spectrally tunable responses in a single material paves the way for compact neuromorphic hardware with multimodal sensing and parallel processing capabilities. This study advances 2D material-based neuroelectronics for edge computing, autonomous robotics, and adaptive artificial intelligence systems.
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高影响因子
ACS Nano
·
2025
·
IF 16
Shiqi Lan,Liu Yang,Shi Zhang,Shijian Tian,Xun Ge,Kaixuan Zhang,Li Han,Dong Wang,Mengjie Jiang,Libo Zhang,Yichong Zhang,Xiaokai Pan,Yingdong Wei,Xiaoshuang Chen,Huaizhong Xing,Cheng Guo,Xiaofang Wang,Kai Zhang,Lin Wang
Broadband anisotropic photodetectors show great promise for polarization-sensitive imaging and multispectral optoelectronic systems yet face critical challenges in material anisotropy modulation and broadband sensitivity. Weyl semimetals exhibit giant optical anisotropy and tunable heterojunction band alignment, enabling high-performance anisotropic photodetection. Herein, ultrabroadband PDs based on the NbNiTe2 (niobium nickel telluride), enabled by antenna integration and heterostructure engineering, achieve high sensitivity from visible to Terahertz (THz). Leveraging its topological quantum material properties and antenna integration, NbNiTe2-based PDs demonstrate high responsivity of 5.86 A/W and fast response time of 0.83 μs in the THz regime. Combined with the nonlinear property of the NbNiTe2-based PDs, a heterodyne experiment is developed, demonstrating their potential for multifrequency THz signal detection and applicability in complex signal processing. The NbNiTe2/MoS2 heterostructure engineered PDs exhibit a remarkably specific detectivity (D*) ranging from 1.37 × 1011 to 4.08 × 1011 cm·Hz0.5·W–1 and broad spectral response covering visible to near-infrared (NIR) wavelengths. Meanwhile, these NbNiTe2-based PDs exhibit significant anisotropic properties, a high electrical conductivity anisotropy ratio of 16.9 and an ultrahigh anisotropy ratio of 5.74. These findings can provide a viable pathway for next-generation room-temperature broadband PDs with high sensitivity and anisotropy.
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高影响因子
Journal of Magnesium and Alloys
·
2025
·
IF 13.8
Houqun Xiao,Luocai Yi,Huxu Lei,Yu Xu,Xiaoxuan Zhang,Huazhou Hu,Ruizhu Tang,Qian Li,Qingjun Chen
Magnesium hydride (MgH 2 ) has garnered significant attention as a promising material for high-capacity hydrogen storage. However, its commercial application remains challenging due to the high operating temperature and slow reaction kinetics. In this study, melt-spun Ti 45 Cr 40 Nb 15 (with a BCC phase) hydride (designated as TiCrNbH x− MS) was synthesized and used to form a nano-multiphase composite to improve the de-/rehydrogenation properties of MgH 2 through ball milling. The incorporation of TiCrNbH x− MS was shown to significantly enhance the hydrogen de-/rehydrogenation properties of MgH 2 . The MgH 2 + 20 wt% TiCrNbH x− MS composite exhibits an appealing initial dehydrogenation temperature of 163 °C and can absorb hydrogen at room temperature. Notably, it releases 5.8 wt% hydrogen in 700 s at 230 °C and recharges 4.3 wt% hydrogen in just 2 mins at 150 °C. Even after 100 cycles, it retains a reversible hydrogen capacity of 4.98 wt%. Kinetic analysis revealed that the dehydrogenation rate follows the Chou surface penetration model. Microstructural analysis showed that the FCC phase of the melt-spun TiCrNbH x− MS hydride reversibly transformed into the BCC phase during the de-/rehydrogenation process in the composite. Numerous phase interfaces were generated and uniformly dispersed on the MgH 2 surface, providing additional hydrogen diffusion pathways and heterogeneous nucleation sites for Mg/MgH 2 , thereby further improving the hydrogen de-/rehydrogenation kinetics of the system. This study offers valuable insights into the use of multiphase composites to enhance MgH 2 performance.
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高影响因子
ENERGY & FUELS
·
2025
·
IF 5.3
Huibo Zhang,Mengtong Yang,Kang Li,Lei Xu,Mingjie Cai,Jie Huang,Yifan Zhang,Zhongxin Dong,Chunmei Zhang,Jiaming Song,Feng Teng,Haibo Fan,Xuexia He,Peng Hu
Transition metal dichalcogenides (TMDs) have attracted great research interest as potential anode materials for lithium-ion batteries (LIBs), owing to their remarkable specific capacity and stable cycling performance. However, challenges, such as limited active sites, poor cyclic performance, and low-rate capability, hinder their broader application. In this study, Co0.1-NbSSe was synthesized by using chemical vapor transport and hydrothermal methods. The Co0.1-NbSSe electrodes show the best performance compared with NbS2, NbSe2, and NbSSe electrodes. Significantly, the Co0.1-NbSSe electrode has a specific capacity of approximately 1037 mA h g–1 at 1 A g–1 after 1000 cycles, indicating its large capacity. At the same time, it has an excellent rate performance of approximately 305 mA h g–1 at 5 A g–1. The improved specific capacity and rate performance are attributed to the enhanced conductivity and additional lithium storage sites. Theoretical and experimental results demonstrate that more defects and reactive sites resulting from doping improve the electrochemical performance. These findings suggest that Co0.1-NbSSe is a good candidate for high-performance LIB anode materials, which offer a pathway to overcome the current challenges in TMD-based electrodes.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yaqi He,Xinhua Li,Zhu Qian,ZuPeng Yan,Guizhen Shi,Xia Sun,Zongqing Ma
In this paper, we innovatively introduced Sn and B into the Nb-Al system at the same time and successfully prepared high-performance Nb 3 Al bulks through mechanical alloying and subsequent low-temperature sintering processes. The influence of different doping amounts of B in the Sn-B co-doping on the superconducting properties of Nb 3 Al superconductors was also investigated. It was found that Sn-B co-doping greatly improves the superconducting properties of Nb 3 Al, especially the J c properties, compared with the undoped sample. The optimal doping amount of Sn-B co-doping is finally determined to be 4 at% Sn-2.6 at% B. At this time, the superconducting transition temperature of Nb 3 Al is up to 16.2 K, and the critical current density reaches up to 1.3 × 10 5 A⋅cm −2 (4.2 K, 5 T), which is almost twice higher than that of Sn-doped Nb 3 Al, and one order of magnitude higher than that of general undoped Nb 3 Al. Combined with the phase composition analysis and microstructure observation, we find that with the co-doping of Sn and B, the grain size of Nb 3 Al is refined, and the diffusely distributed Nb 2 Al nanoparticles are introduced, which greatly enhance the magnetic flux pinning effect of Nb 3 Al. Secondly, the intergranular connectivity of Nb 3 Al is significantly improved. The Sn-B co-doped Nb 3 Al superconductors combine the advantages of Sn doping to enhance flux pinning and B doping to improve intergranular connectivity, which synergistically promotes the dramatic improvement of Nb 3 Al superconductivity Nb 3 Al.
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高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2025
·Vol. 222
·期 22
·2500553
·
IF 1.9
Yaqi He,Xinhua Li,Lihua Zhang,Jiawei Xu,Songhua Chen,Zongqing Ma
In this article, a batch of high-performance Sn-doped Nb 3 Al superconductors is prepared through mechanical alloying and subsequent low-temperature sintering. This article comparatively analyzes the superconducting properties, phase structure, and microstructure of Sn-doped Nb 3 Al under different sintering temperatures and sintering times to determine the most suitable sintering process for Sn-doped Nb 3 Al. The results show that the optimum sintering temperature of Sn-doped Nb 3 Al bulks is 800 °C, with an optimal sintering time of 5 h. The T c value of Sn-doped Nb 3 Al bulk obtained under this sintering condition is 14.8 k, and the value of J c is as high as 6.2 × 10 4 A cm −2 (4.2 K, 5 T). The elevated sintering temperature (900 and 1000 °C) results in significant growth of both Nb 3 Al grain size and Nb 2 Al nanoparticles. This reduces the number of effective pinning centers in the superconducting phase of Sn-doped Nb 3 Al, which severely weakens the flux pinning effect. As a result, the J c performance deteriorates gradually as the sintering temperature increases from 800 to 1000 °C. The extended duration of sintering time results in the formation of sintering holes, which significantly disrupt the continuity of the Nb 3 Al superconducting phase matrix and degrade its superconducting properties.
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危险品化学品经营许可证（带存储）