VACUUM
·
2024
·
IF 3.8
Yonghui Yang,Hengwei Yan,Zhanwei Liu,Shenghui Guo,Jin Zhang,Rui Xia
The potential for the preparation of titanium metal through molten salt electrolysis is significant. However, the conventional process of molten salt electrolysis uses chloride molten salt as the electrolyte, which has low solubility for titanium dioxide (TiO 2 ). This paper introduces an innovative approach using a NaF-K 2 TiF 6 system as the molten salt electrolyte, which offered high solubility for TiO 2 . The solubility and dissolution behavior of TiO 2 in NaF-K 2 TiF 6 were analyzed carbon, oxygen and nitrogen analysis (LECO), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and high-temperature Fourier transform infrared spectroscopy (FT-IR). By optimizing the electrolysis temperature, cathode current density, and electrolysis time, titanium metal was successfully prepared, and impurities were removed through water washing and salt washing to obtain pure sponge-like titanium powder. Focused ion beam-scanning electron microscopy (FIB-SEM) analysis revealed that the titanium purity and oxygen content were consistent across both the surface and interior of the powder, thereby indicating effective prevention of oxidation in a vacuum argon (Ar) environment. This method offers the possibility of continuous production of titanium metal through molten salt electrolysis.
研究领域:
材料科学
·
冶金工程
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DOI
高影响因子
Metals
·
2024
·Vol. 14
·期 11
·1288
·
IF 2.6
Tianzhu Mu,Fuxing Zhu,Yan Zhao,Haoyu Fang,Haohang Ji,Lei Gao
Titanium metal is primarily produced via the Kroll process, which is characterized by a semi-continuous production flow and a lengthy process cycle, resulting in high production costs. Researchers have explored alternative methods for titanium production, including molten salt electrolysis, such as the Fray–Farthing–Chen (FFC), Ono Suzuki (OS), and University of Science and Technology Beijing (USTB) processes, aiming to achieve more economical production. Among these, the USTB process, a representative of soluble anode electrolysis, has shown significant promise. However, controlling oxygen concentration in titanium produced by soluble anode electrolysis remains a challenge. This study proposes a novel approach to enhance deoxidation efficiency in soluble anode electrolysis for titanium production by introducing yttrium chloride (YCl3) into the molten salt electrolyte. Thermodynamic analysis and experimental validation demonstrate that the theoretical deoxidation limit for titanium can reach below 100 ppm under Y/YOCl/YCl3equilibrium. We report the successful synthesis of titanium powder with an oxygen concentration of 6000 ppm from titanium-carbon-oxygen solid solution. Under optimized conditions, the purity of the titanium powder reached 99.42%, demonstrating a new approach for producing high-purity titanium. This method, based on soluble anode electrolysis, offers a potential alternative to the conventional Kroll process. The research elucidates the fabrication process and analytical methods for titanium-carbon-oxygen solid solution, and employs a combination of analytical techniques, including XRD, SEM-EDS, and ONH Analyzer, for characterization of the electrolytic product, encompassing phase analysis, microstructure, and oxygen concentration testing.
研究领域:
冶金学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Muhammad Mujahid Ali,Zhiyuan Zhu,Mengyu Wang,Dilshad Hussain,Xia Gao,Jianfeng Wang,Zhenxia Du
Endogenous glycopeptides are significantly important in diverse pathological and physiological systems, but their direct analysis is severely hampered by their low abundance and presence of interfering species in biological fluids. In this study, we synthesized the amine-functionalized titanium metal-organic framework (NH 2 -MIL-125(Ti)) by a simple hydrothermal method, characterized and used for glycopeptides enrichment. The designed separation media is highly hydrophilic and stable which is suitable for hydrophilic interaction chromatography (HILIC). To make the process smooth, simple, reliable, and robust, NH 2 -MIL-125(Ti) crystals were packed in pipette-tip using hydrophilic melamine foam, as supporting frit. Free amine groups, present in the structure imparted hydrophilicity and a unique pattern of porosity, contributing to the size exclusion effect that excluded the large-sized proteins up to 1:700 peptide to protein ratio. The prepared MOF particles possessed regular porosity, high surface area, good hydrophilicity, and offered an in-tip flow-based set-up enhanced the enrichment performance for N -linked glycopeptides. The affinity material showed a detection limit of 1 fmol.µL −1 and selectivity up to 1:1000 (HRP digest to BSA digest). Moreover, repeatability and reusability were evaluated up to five rounds of enrichment using the same affinity tip, and scanning electron microscopic images revealed no structural changes in the MOF crystals. Finally, the MOF packed in pipette tip was applied to selectively capture the N- linked endogenous glycopeptides from a healthy saliva sample and 64 unique endogenous glycopeptides were identified. These results demonstrated the excellent potential of NH 2 -MIL-125(Ti) based affinity tip for glycopeptides which can be used to enrich trace glycopeptide biomarkers from the biological fluids.
研究领域:
分析化学
·
蛋白质组学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Dingliang Dai,Jianhao Qiu,Lu Zhang,Hong Ma,Jianfeng Yao
A subtle flower-like MIL-125-NH 2 @BiOI was fabricated by a facile solvothermal method for simultaneously eliminating Cr(VI)/tetracycline mixed pollutants under visible light . The strong interaction between amino in MIL-125-NH 2 and Bi 3+ of BiOI promotes the formation of this unique inlaid structure and enables the favorable contact between MIL-125-NH 2 and BiOI, thus accelerating the transfer of charge carriers. Remarkably, MIL-125-NH 2 @BiOI displays a superior activity compared with that of two monomers for the photocatalytic reduction of Cr(VI) and degradation of tetracycline . More significantly, the photocatalytic efficiency can be further boosted in the coexistence of Cr(VI) and tetracycline , which is 1.8 and 1.6 times that of single Cr(VI) and tetracycline, respectively. The synergistic effect between Cr(VI) reduction and tetracycline oxidative degradation can further facilitate the separation of photo-induced electrons and holes, resulting in the improved efficiencies in the Cr(VI)/tetracycline coexistent environment. This work sheds light on that MOF-based photocatalysts possess huge potential for practical environmental remediation.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of the American Chemical Society
·
2020
·
IF 14.612
Mei-Yan Gao,Kai Wang,Yayong Sun,Dejing Li,Bai-Qiao Song,Yassin H. Andaloussi,Michael J. Zaworotko,Jian Zhang,Lei Zhang
A series of increasingly large silver nanoclusters with a varied combination of Archimedean and/or Platonic solid arrangements was constructed using a flexible trifurcate TiL3 (L = Salicylic acid or 5-fluorosalicylic acid) metalloligand: Ag4@Ag4@Ti4 (PTC-85), Ag12@Ti4 (PTC-86), Ag4@Ag6@Ag12@Ti4 (PTC-87), Ag6@Ag24@Ag12@Ti4 (PTC-88), and Ag12@Ag24@Ti4 (PTC-89). The silver nanoclusters are each capped by four TiL3 moieties, thereby forming {Ti4} supertetrahedra with average edge lengths ranging from ∼8.12 Å to ∼17.37 Å. Such {Ti4} moieties further induce the tetrahedral geometry of the encapsulated silver nanoclusters. These atomically precise metallic clusters were found to be ultrastable with respect to air for several months, and to water for more than 3 days, due to the stabilizing effects of the TiL3 metalloligand. Moreover, the obtained clusters exhibit nonlinear optical (NLO) effects in optical limiting tests and also temperature-dependent photoluminescent properties. This work provides an interesting metalloligand method not only to induce the spatial growth of metallic clusters to achieve highly symmetric structures, but also to enhance their stability which is crucial for future application.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Xinru Li,Zaiyuan Le,Xiaolang Chen,Zhaoqing Li,Wenchao Wang,Xiaoyan Liu,Ao Wu,Pengcheng Xu,Dieqing Zhang
Graphene oxide (GO) enhanced amine-functionalized titanium metal organic framework (NH 2 -MIL-125(Ti)) was fabricated via a facile microwave solvothermal process by using GO, C 12 H 28 O 4 Ti, and 2-aminoterephthalic acid as precursors. Under the microwave irradiation, the surface of GO could act as the microwave antenna for fast absorbing microwave energy with the formation of hot-spots on GO (hot-spots effect). These hot-spots allowed both the well-crystallization of NH 2 -MIL-125(Ti) crystals with a highly dispersity on the surface of GO and the strong interaction between NH 2 -MIL-125(Ti) and GO, supported by various characterization such as XRD, Raman, UV–vis and so on. Benefiting from the strong interaction and high electronic conductivity of GO, such GO/ NH 2 -MIL-125(Ti) hybrid exhibited a greatly enhanced metal organic framework crystallinity, visible-light absorption, photocurrent intensity, electron carrier density and a lower photo-generated electron-hole recombination rate, compared to the pure NH 2 -MIL-125(Ti). Therefore, the as-obtained hybrid system was proved highly efficient for photocatalytic oxidation of gaseous pollutants, such as nitric oxide (NO x ) and acetaldehyde with long durability, under visible light (λ > 420 nm) irradiation.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Taotao Cai,Ying Zhang,Shili Zheng,Peiyi Yan,Yi Zhang
Titanium is a highly valued material. Developing a lower-cost titanium (Ti) metal powder production process, potentially substituting the conventional Kroll-HDH method, has challenged the titanium community for decades. The ease of aluminum forming alloys with titanium and the strong chemical affinity of titanium to oxygen rule out the possibility of fabricating pure Ti metal directly by aluminum reduction of TiO 2 . Based on the demonstrated enhanced deoxidation of Ti using Mg metal, this paper proposes an Al–Mg combined stepwise reduction of TiO 2 to fabricate Ti metal powder. Critical challenges overcome in this research include predicting reaction thermodynamics and preparing Ti 2 O intermediate by Al reduction of TiO 2 without significant Al alloying, which is made possible by forming mild-acid soluble Ca 12 Al 14 O 32 Cl 2 byproduct. Various Al reduction conditions were investigated and optimized. To the best of our knowledge, it is the first report to fabricate Ti 2 O powder by Al reduction of TiO 2 with a highly stable chemical composition. The difficulty of sintering the Ti 2 O intermediate before Mg deoxidation to reduce the surface oxygen contribution is mitigated by mixing a certain amount of low-oxygen titanium powder with the Ti 2 O powder. This allows the densification temperature to be lowered from 1400 °C for sintering pure Ti 2 O powder to 1100 °C. Even with as much as around 15 wt% oxygen, the sintered powder can be effectively deoxidized by Mg with the help of hydrogen. A titanium metal powder with an oxygen content of 0.134 wt%, an Al content of 0.123 wt%, and other impurities meeting the standard of pure titanium metal powder (GB/T 34486-2017 FTA1) is successfully prepared by the Al reduction-Mg deoxidation combined process. It is a promising alternative for producing titanium metal powder and its derivatives.
研究领域:
材料科学
·
冶金学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 15
·1-17
·
IF 2.8
Wang Renjie,Hu Mengmeng,Zhu Yifan,Jin Xiaxue,Ge Siying,Cai Runjing,Wang Tongliang,Cheng Qiaohuan,Ran Huijuan,Peng Fei
Dopamine is a critical neurotransmitter, and its dysfunction is strongly linked to various neurological disorders, including Parkinson’s disease, depression, and schizophrenia. Current detection techniques exhibit limitations in clinical applications; therefore, developing a method with high sensitivity and rapid response for dopamine detection holds significant importance. In this study, poly(3,4-ethylenedioxythiophene) (PEDOT) was synthesized via the solvent method, and a novel electrochemical sensor was constructed by integrating titanium metal–organic framework (Ti-MOF) with PEDOT through an in-situ synthesis strategy. This sensor combines the REDOX properties of Ti-MOF with the high conductivity of PEDOT, demonstrating exceptional sensitivity toward dopamine. The linear detection range spans from 8 to 400 μM, with a detection limit of 3.815 μM. In the presence of ascorbic acid (AA), dopamine (DA), and uric acid (UA), the sensor exhibits remarkable selectivity for DA. Repeatability testing reveals that the relative standard deviation of the sample response current is less than 5%, indicating high data consistency. Furthermore, after one month of storage, the senso’s response to DA decreases by only 12%, reflecting excellent reproducibility. Additionally, this study provides an in-depth analysis of the sensor’s REDOX mechanism, offering theoretical support for its optimization and practical application. The successful development of this sensor introduces an innovative, efficient, and highly sensitive approach for dopamine detection, thereby expanding the application scope of Ti-MOF in the field of electrochemical sensing.
研究领域:
生物医学工程
·
材料科学
·
神经科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wei Zhou,Minghe Cao,Hongye Wang,Hua Hao,Zhonghua Yao,Hanxing Liu
The miniaturization of electronic components requires materials with colossal permittivity. In this work, titanium-powder-doped TiO 2 ceramics with colossal permittivity and a low dielectric loss over a wide range of frequency and temperature were successfully prepared using a solid-state reaction in an Ar atmosphere. TiO 2 ceramics with 2% Ti powder doping had the highest permittivity (110,000) and the lowest dielectric loss (0.029) at 1 kHz and room temperature. Systematic defect analysis showed that Ti 4+ was successfully reduced to Ti 3+ through doping with Ti metal powder. Further, oxygen vacancies were created in the high-temperature inert atmosphere, which promoted the formation of defect clusters with T i 3 + − V o ″ − T i 3 + as the core. Polarization and local confinement of the defect clusters resulted in the colossal permittivity and low dielectric loss. Therefore, this work provides necessary information and novel ideas for the design of correlated defects in colossal permittivity materials.
研究领域:
材料科学
·
电气工程
·
陶瓷
·
缺陷工程
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Fei Wang,Xing Wang,Siwei Li,Qisen Yang,Haibo Mu,Jinyao Li,Yu Yang
Severe skin damage resulting from acute trauma is often accompanied by uncontrolled bleeding, microbial infections, and delayed wound healing. Herein, multifunctional sprayable hydrogels (CT-CS-ZIF@CIP Gel) were developed for wound management by incorporating antibacterial nanoplatforms (CT-CS-ZIF@CIP) into photocurable gels consisting of chitosan methacrylate and gallic acid grafted gelatin. The nanoplatform was initially constructed by sequentially loading Cu 2 Se (CS) and ciprofloxacin-decorated zeolitic imidazolate framework-8 (ZIF@CIP) onto Cu-doped Ti MOF (CT), in which CS served as a photothermal agent, ZIF enabled pH-responsive release of CIP, and CT acted as carriers for CS and ZIF@CIP. The hydrogel precursor can be sprayed onto wound surface and photocured quickly, allowing hydrogel to fit the wound shape and form a protective barrier onsite. The resultant hydrogel exhibited excellent hemostatic ability, adhesion properties, cytocompatibility and toxin adsorption capacity. By integrating CS for short-term photothermal therapy with CIP for long-acting chemotherapy, the CT-CS-ZIF@CIP Gel demonstrated 100 % sterilization of three bacterial strains. Furthermore, moderate release of zinc and copper ions promoted wound healing. The therapeutic efficacy of hydrogel was validated in an infected cutaneous mouse model. Overall, this work presents a versatile sprayable hydrogel that can be flexibly applied to irregular dynamic wounds for safe and effective wound management.
研究领域:
生物医学工程
·
材料科学
·
伤口管理
·
药剂学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）