INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
YongKwan Lee,HyunChul Kim,Namhun Kwon,JaeJin Sim,MiHye Lee,SoongJu Oh,SeokJun Seo,JaeHong Shin,Kyoungtae Park
The Hunter process is predominantly used to manufacture high-purity Ta powder. Among the various physical properties of the Ta powder, its impurity content is particularly crucial. In this study, the process temperature at which a liquid pool of raw material and diluent can be formed and the corresponding amount of diluent were analyzed by performing thermodynamic simulations using FactSage and HSC Chemistry software. Based on the results of the thermodynamic simulations, Ta powder was prepared at process temperatures of 700–800 °C and a specific amount of NaCl at each temperature. Thereafter, the prepared Ta powder was recovered and a post-treatment process was performed to ensure purity. The characteristics of the recovered Ta powder were evaluated according to each process condition by oxygen/nitrogen/hydrogen analysis, scanning electron microscopy/energy-dispersive X-ray spectroscopy, glow discharge-mass spectrometry, and X-ray diffractometry. The synthesized Ta powders were confirmed to exhibit purities >99.95% and oxygen, nitrogen, and hydrogen concentrations of 447, 21, and 10 ppm, respectively. The characterization results indicated that the produced Ta powders were fabricated entirely in a single phase with high purity and recovery rates. Finally, process optimization was achieved for manufacturing high-purity (≥3 N5) Ta powder with controllable impurities.
研究领域:
材料科学
·
冶金学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Yapeng Kong,Yu Xiao,Xuemin Liang,Yangyang Fan,Liqiang Wang,Sheng Yang,Jilin He,Yuran Chen
We report a facile approach for the synthesis of nanoscale tantalum powder through the electro-deoxidation of Ta 2 O 5 cathode in molten Na 3 AlF 6 -K 3 AlF 6 -AlF 3 . The cathodic process begins with a solid-liquid reaction between Ta 2 O 5 and the electrolyte, resulting in the formation of M x TaO 2+ x F 1- x (M = Na, K) intermediates, which are then electrochemically reduced to tantalum directly. We developed a Ta 2 O 5 cathode with a new porous structure, which contains interconnected microporous, mesoporous and macroporous structures, possessing properties such as high surface area, high pore volume ratios, and excellent accessibility to active sites. This novel cathodic pore structure material enabled the formation of uniform-sized M x TaO 2+ x F 1- x particles with a regular cubic morphology by providing abundant nucleation sites and promoting uniform growth of intermediate. The electrochemical decomposition of these particles and the nucleation, growth mechanisms of tantalum product were also investigated. Our study demonstrates the rational design and synthesis of hierarchically porous cathode materials can facilitate the controllable synthesis of nanoscale metal powders by the FFC process, and may open up new opportunities for the development of other materials with desired morphology and particle size.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Yapeng Kong,Xiwen Chen,Longdi Ma,Yinxiang Han,Yuran Chen,Liqiang Wang,Yangyang Fan,Xuemin Liang
The molten salt electro-deoxidation, i.e. the FFC (Fray-Farthing-Chen) process, demonstrates considerable potential for the synthesis of tantalum powder. However, its practical application is hindered by the long electrolysis duration. This study proposes an accelerated electro-deoxidation process in molten Na 3 AlF 6 -AlF 3 salts for preparing ultrafine Ta powder, which achieves a sequential cathode phase transformation from Ta 2 O 5 through intermediate NaTaO 3 to Ta. NaTaO 3 is formed through in situ interfacial reactions between Ta 2 O 5 and the electrolyte. We demonstrate for the first time that the growth of the FFC-type intermediate is driven by nanoparticle assembly and oriented attachment mechanism. This growth mechanism is influenced by the structure of the electrolyte/particle interface. By constructing a novel hierarchical pore structure Ta 2 O 5 cathode with optimized interfaces, we facilitated a microstructurally controllable transformation of Ta 2 O 5 to fine NaTaO 3 , thereby effectively mitigating the elongation of oxygen ions solid diffusion pathway induced by intermediate coarsening. In the case of self-assembled NaTaO 3 , the weak bonding between the nanoparticles also favors the kinetics of their subsequent decomposition into Ta. This approach has been shown to enable the complete reduction of 1 g of Ta 2 O 5 within only 1 h, demonstrating a significant enhancement in process efficiency. The resulting Ta powder exhibits uniform monodisperse morphology and good capacitive behavior in Na 2 SO 4 electrolyte solution. The present study may now guide the way towards establishing the electrochemical route for the efficient preparation of many other refractory powders materials.
研究领域:
材料科学
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电化学
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粉末冶金
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纳米技术
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无机化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2025
·
IF 4.6
Shuailing Ma,Yufei Ge,Wang Chen,Min Lian,Xingbin Zhao,Qiang Tao,Kuo Bao,Pinwen Zhu,Tian Cui
It is widely acknowledged that strong electron-phonon coupling in conventional superconductors predominantly arises from the high vibrational frequencies of light elements. In this work, we report an anomalous superconducting system where the superconducting behavior in the covalent metallic compound TaC originates predominantly from heavy transition metal atoms. Polycrystalline samples of the ‘covalent metal’ TaC (space group Fm-3 m) were synthesized using a high-pressure high-temperature (HPHT) technique. Comprehensive characterization through direct magnetic susceptibility and electrical resistivity measurements confirms that TaC exhibits characteristics of a weakly-coupled type-II superconductor, demonstrating both a remarkably high upper critical magnetic field and a superconducting transition temperature ( T c ) of 9.0 K. Intriguingly, the material displays exceptional mechanical properties as evidenced by its asymptotic Vickers hardness values, which significantly surpass these of conventional superconducting materials. The composition with Ta:C = 1:0.9 demonstrates optimal performance balance, achieving a maximum Vickers hardness of 18.7 GPa while maintaining robust superconducting transition characteristics. First-principles calculations reveal that the elevated T c primarily stems from substantial electronic contributions from tantalum atoms. Our findings demonstrate that controlled introduction of carbon vacancies serves as an effective strategy for tailoring these dual functional characteristics, providing novel design principles for developing specialized superconducting devices capable of operating under extreme mechanical and electromagnetic conditions.
研究领域:
凝聚态物理
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材料科学
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超导物理
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高压材料合成
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材料力学性能
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DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Haoyu Yue,Zhongnan Guo,Wenjing Guo,Ruonan Yao,Shuang Zhen,Qiansu Ma,Ming Chen,Jiawei Lin,Wenxia Yuan
The high-entropy strategy offers a viable pathway to activate the inert basal plane of transition metal dichalcogenides (TMDs) for electrocatalysis. This work demonstrates that the “lattice distortion effect”, one of the core effects of high-entropy materials, plays a crucial role in activating the basal plane of TMDs. A high-entropy diselenide (ReNbTaMoW)Se 2 (denoted as HESe 2 ) is synthesized via solid-state reaction. Single-crystal X-ray diffraction and atomic resolution scanning transmission electron microscopy reveal a unique fivefold-modulated structure in HESe 2 , which unexpectedly distorts the rigid trigonal prismatic motif. HESe 2 exhibits exceptional activity for hydrogen evolution reaction (HER), showing a low overpotential of 31 mV at a current density of 10 mA cm −2 , comparable to state-of-the-art precious metal catalysts. In situ X-ray photoelectron spectroscopy indicates that the distorted structure of HESe 2 remains stable during the HER process. A proton exchange membrane (PEM) electrolyser assembled with HESe 2 cathodic catalyst shows competitive performance and durability with negligible degradation over 400 h. Density functional theory calculations reveal the electron accumulation regions induced by lattice distortion as high-activity sites, thereby driving the augmented HER performance of HESe 2 . This work presents a universal strategy for boosting the basal plane activity of layered materials through unique lattice distortion effect.
研究领域:
材料科学
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电化学
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催化
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能源材料
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纳米技术
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产品关联
DOI
高影响因子
ACS Applied Optical Materials
·
2026
·Vol. 4
·期 7
·2056-2066
·
IF 3.4
Xiang Cheng,Guo Junliang,Jiang Guobao,Yang Minghui,Chen Jieyi,Zhu Xuancheng,Huang Zuoqiang,Zhou Yue,Gan Yuan,Zhang Quanlong,Yu Qiang,Chen Ying
The development of high-performance
saturable absorbers
(SAs) combining
strong nonlinear optical response, robust environmental stability,
and ease of fiber integration remains critical for advancing compact
ultrafast fiber laser systems. Here, a fiber integrated SA was demonstrated
based on the high quality ternary crystal Ta 2 Ni 3 Te 5 , synthesized by chemical vapor transport and transferred
onto fiber facets via a precision dry-transfer technique. Benefiting
from its van der Waals layered structure and unique electronic topology,
Ta 2 Ni 3 Te 5 based SA exhibits a modulation
depth of 19.98% and a saturation intensity of 0.74 GW/cm 2 at 1.55 μm excitation. When incorporated into an erbium-doped
fiber laser cavity, the Ta 2 Ni 3 Te 5 –SA enables both stable dual-wavelength Q-switching and robust
mode-locking. In the mode-locked regime, the laser delivers picosecond
pulses (2.07 ps), with a repetition rate of 10.66 MHz. It is worth
noting that the output power of the pulsed laser is up to 24.6 mW,
and the signal-to-noise ratio is as high as 76.8 dB. Moreover, the
SA exhibits strong optical damage resistance and maintains stable
performance after prolonged storage, underscoring its environmental
robustness. This work establishes Ta 2 Ni 3 Te 5 as a promising nonlinear optical material for ultrafast photonics
and provides a practical pathway toward high-performance, fiber pulsed
laser sources.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
·
IF 9.7
Haining Chen,Xin Tao,Jinbo Liu,Qian Kong,Li Wang,Yiwen Zhao,Chao Jiang,Yu Song,Xu Xu,Jialin Zhu,Yiyang Wang,Fengyi Du,Baoding Chen,Jun Wu
Cartilage injury repair remains challenging because of its unique physical structure and pathological micro-environment, including vascular invasion and inflammatory environment. In this study, inflammatory responsive hydrogels (TA-Mg@Bev iHGs) reinforced by bevacizumab (Bev)-loaded infinite coordination nanopolymer (TA-Mg@Bev) were fabricated for accelerated cartilage repair via anti-angiogenic and anti-inflammatory effects. The incorporation of TA-Mg@Bev iHGs enhanced the mechanical strength of TA-Mg@Bev via phenolic hydroxyl group-mediated hydrogen bond, enabling a sustained drug release under inflammatory environment. Moreover, the released TA-Mg@Bev greatly accelerated chondrogenic proliferation and differentiation from bone marrow mesenchymal stem cells but inhibited the hypertrophy of chondrocytes. The TA-Mg@Bev iHGs inhibited the proliferation of human umbilical vein endothelial cells and corresponding angiogenesis. In a rabbit model of full-layer cartilage defect, the TA-Mg@Bev iHGs promoted in situ cartilage regeneration through immunohistochemistry (type I collagen, type II collagen, and aggrecan). Overall, our study presents a cooperative induction system for accelerated cartilage regeneration.
研究领域:
生物材料
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组织工程
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纳米技术
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药学
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生物医学工程
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骨科
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Cheng Dai,Qian Wang,Hun Huang,Ye Hu,Junlin Chen,Chuhan Lv,Hongbo Yu,Yun Li,Hua Dong
Rapid and efficient hemostasis of massive bleeding wounds remains a major challenge in clinical practice. Self-gelling powders are now emerging as the new-generation hemostatic materials due to their capability to form hydrogels via a self-gelling process and thus integrate the merits of powders and hydrogels. However, they still face several unsettled issues, such as complex components, tedious synthesis, and poor compatibility with hemostatic powders on sale. Herein, we propose a universal strategy to enhance the hemostatic, antibacterial, and wound healing performance of polysaccharide powders via a water-soluble assembly macromolecule (tannic acid-grafted carboxymethyl chitosan, CCTA). When CCTA is blended with polysaccharide hemostatic powders and exposed to blood, the abundant ortho-phenolic hydroxyl groups of CCTA can build a dense hydrogen bonding network with swollen powders (i.e., microgels), erythrocytes, and platelets, leading to the in situ formation of microgel assembly with excellent mechanical strength, tissue adhesion, and thus sealing performance. In addition, CCTA also endows hemostatic powders with good antibacterial activities. The as-formed porous microgel assembly facilitates cell migration and ingrowth, leading to accelerated wound healing and tissue repair in vivo. Three types of polysaccharide powders and three bleeding models (rat femoral artery, rabbit liver, pig liver, and spleen) are used to validate our strategy.
研究领域:
生物材料学
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创伤医学
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再生医学
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药用高分子
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纳米医学
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感染控制
·
止血技术
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Yuan Tian,Pan Wu,Xiong Yang,Yafei Shi,Gary Owens,Kewu Pi
Tailoring interfacial architectures in porous photothermal materials is critical for advancing solar-driven desalination technologies. Herein, we present a fully bio-based aerogel engineered through an iron-polyphenol coordination strategy inspired by the traditional Chinese “iron-tannin dyeing” method. Liquid-phase tannic acid (TA) extract and solid-phase cellulose from Chinese gallnut were co-assembled with sodium alginate, followed by Fe 3+ /Ca 2+ dual-ion crosslinking and freeze-drying, yielding a TA@SA@Fe 3+ aerogel with hierarchical porosity and adaptive interfacial characteristics. The tailored coordination network enhances light absorption (95.7 %), hydrophilicity, and a high solar evaporation rate of 2.0 kg·m –2 ·h –1 under 1 sun illumination. Its interconnected pores promote salt diffusion, ensuring long-term outdoor operation. Furthermore, the material exhibits strong adhesion on diverse substrates—including melamine sponges and geotextiles—supporting modular integration into scalable desalination systems. A comprehensive life cycle assessment (LCA) confirms the sustainability advantage of this system, with a total emission of only 2.4 kg CO 2 -equivalent per kilogram of material, significantly lower than conventional alternatives. This work offers a green, cost-effective, and application-ready strategy for designing interfacial aerogels, providing a promising platform for next-generation solar-thermal water purification technologies.
研究领域:
材料科学
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环境工程
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可持续技术
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太阳能利用
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水净化
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Yaqing Zhao,Yaming Sun,Chenchen Song,Hailiang Zhao,Shiqi Chai,Xuemeng Xu,Lijun He
Organophosphorus pesticides (OPPs) severely pollute various environmental water due to their excessive use, and it is extremely urgent to develop novel adsorbents with high adsorption capacities, rapid removal rate and easily recovery for the removal of OPPs. In this study, defect-rich Co/N-doped hierarchically porous carbons (Co/N-DHPCs) were constructed by pyrolyzing acid-etched ZIF-67 precursor. The developed Co/N-DHPCs possessed rich defects, well-developed hierarchical porous structure, high specific surface area and excellent magnetic property, and exhibited large adsorption capacities of 103.81∼126.10 mg g -1 and high removal efficiencies of 94.06 %∼100.00 % for fenitrothion, fenthion and phosalone within 15 min. The exceptional adsorption performance of Co/N-DHPCs could be attributed to the pore-filling effect, hydrophobic and π-π interactions, as well as the new active sites formed by rich defects and N heteroatoms doping. In addition, the magnetic property of Co/N-DHPCs enabled rapid and straightforward separation from aqueous solution. The Co/N-DHPCs also showed good reusability with removal efficiencies of 85.24 % after five consecutive recycles. Furthermore, the developed Co/N-DHPCs demonstrated remarkable removal efficiencies of OPPs in seven environmental water samples, particularly in high-salt seawater. This work provides a kind of reliable adsorbents for removing pollutants in environmental water.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2025
·
IF 9.8
Xinyu Hu,Hongli Xie,Hao Wang,Liguo Shen,Renjie Li,Hongjun Lin,Leihong Zhao,Genying Yu
Efficient oil/water emulsion separation remains a critical challenge in industrial wastewater treatment due to the stability of emulsified oil droplets and the complexity of traditional membrane modification techniques. This study introduced a novel approach by employing a green, convenient, and controllable inkjet printing technique to fabricate a new inversely beetle-inspired hydrophobic zeolitic imidazolate framework-67 (ZIF-67) nanoparticle-modified tannic acid (TA)‑titanium (IV) bilayer structure on a polyvinylidene fluoride (PVDF) substrate. The resulting PVDF/TA-Ti(IV)/ZIF-67 membrane significantly enhanced the separation efficiency of oil/water emulsions. The TA-Ti(IV) layer not only enhanced the adhesion and uniform distribution of ZIF-67 but also minimized reagent consumption, simplifying the fabrication process. The hydrophobic ZIF-67 particles on the membrane served as localized active sites, facilitating the coalescence of small oil droplets within the emulsion, thus achieving effective demulsification and transforming stable oil-water emulsions into easily separable, unstable emulsions. This innovative membrane demonstrated optimal flux and rejection rates in oil/water emulsion separation. Its water flux exceeded 311.0 L·m −2 ·h −1 in gasoline, diesel, and soybean oil emulsions, approximately 5.5 times that of the unmodified PVDF membrane, while maintaining an oil rejection rate of over 99.6 %. Remarkably, the PVDF/TA-Ti(IV)/ZIF-67 membrane retained over 99 % separation efficiency after six filtration cycles, underscoring its exceptional antifouling performance and long-term operational stability. The innovative membrane developed in this study offers a cost-effective, scalable, and environmentally sustainable solution for large-scale oil/water emulsion treatment. Its bio-inspired wetting structure significantly enhances flux, oil rejection, and antifouling capabilities, marking a major advancement in industrial water treatment applications.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Yanli Wang,Jing Liang,Feiyan Yan,Huiling Li,Liping Xie,Li Tang,Dejiao Ning,Cuiwen Jiang,Tao Li,Xiaochuan Huang,Ke-Jing Huang,Yu Ya
In the present study, a novel mesoporous silica/nitrogen-doped graphene composite modified electrode (MS/NGR/GCE) is prepared using an in-situ electrochemical method. The large specific surface area, excellent loading and electron transfer capabilities of the mesoporous silica/nitrogen-doped graphene composite make the modified electrode favored for electrochemical sensing. The sensing properties of different electrodes towards tannins are investigated, and the results show that MS/NGR/GCE exhibits much better sensing performance than individual graphene or mesoporous silica modified electrodes. Under optimal conditions, the linear range of MS/NGR/GCE for determination of tannins is 0.10–5.0 μmol/L and 5.0–80 μmol/L, respectively, with a detection limit of 0.050 μmol/L (S/N = 3). These results demonstrate that this study has opened up a new pathway for constructing high-performance nanocomposite electrochemical sensors.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）