JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Ming Li,Xiaoli Xi,Qingqing Liu,Zuoren Nie,Liwen Ma
In this study, WC–10Co cemented carbide scrap was used as a consumable anode to separate and prepare tungsten and cobalt powders in NaF–KF melts at 1073 K. The feasibility of direct electrochemical dissolution of WC main phase to produce metallic tungsten was analyzed by thermodynamic calculations and experimental verifications. Furthermore, a series of electrolysis experiments were performed under constant cell voltage for selective preparation of tungsten and cobalt powders. The results show that metal cobalt powder was obtained at ≤0.6 V whereas metal tungsten powder was produced between 0.6 V and 1.2 V. The analysis of cathode products using scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) show that tungsten and cobalt powders can be prepared in NaF–KF melts. Finally, linear sweep voltammetry (LSV) and electrochemical impedance spectroscopy (EIS) were used to investigate the dissolution of WC–10Co anode. The electrochemical properties of tungsten and cobalt ions in NaF–KF melts were studied by cyclic voltammetry (CV) and square wave voltammetry (SWV). The results show that WC–10Co anode could be used to produce tungsten and cobalt powders and the electroreduction of tungsten and cobalt ions in NaF–KF melts was achieved through a one-step reaction involving the transfer of two electrons.
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DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
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2026
·
IF 3.6
Haoyuan Yang,Xinyu Liu,Taiyu Duan,Weichao Wang,Qinyuan Zhang
Glass-forming region guided design gives a stable Zn(PO 3 ) 2 -AlF 3 -NaF fluorophosphate host (ΔT ≈ 166 °C) for fiber drawing. • Fluorine as a network modifier creates a low-phonon environment, boosting 1.5 μm emission. • Broadband 1.5 μm emission in bulk (47.2 nm) and fiber (ASE 1450–1650 nm, 0.187 dB/cm). Driven by the rapid growth of AI, 5G/6G, and chip-scale LiDAR, broadband 1.5 μm gain media with high efficiency and fiber compatibility are urgently needed. However, the structure-spectroscopy correlation governing the luminescence performance of Er 3+ /Yb 3+ co-doped glasses remains insufficiently understood. In this work, a Zn(PO 3 ) 2 -AlF 3 -NaF fluorophosphate glass composition (ZAFPN15) was selected based on a previously reported glass-forming region and characterized from atomic structure to fiber-level performance. Molecular dynamics simulations indicate that fluorine predominantly acts as a network modifier and that Er 3+ ions are predominantly coordinated by fluorine (Er–F coordination number ≈ 7.73). The local phonon energy around Er 3+ ions is estimated to be below 500 cm⁻ 1 , much lower than the nominal maximum phonon energy (∼1260 cm⁻ 1 ). The optimized glass exhibits a measured emission cross-section of 0.54 × 10⁻ 20 cm 2 at 1535 nm with an effective linewidth of 47.2 nm, together with a low inversion threshold (∼0.2). Fiber fabrication from this glass shows amplified spontaneous emission (ASE) spanning 1450–1650 nm with a propagation loss of 0.187 dB/cm at 1535 nm. These results demonstrate that this specific fluorophosphate glass composition can be processed into an active fiber with broadband near-infrared emission, and the structural data offer a possible explanation for the observed emission properties.
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高影响因子
Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 37
·9579-9587
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IF 5.256
Ji-Wei Shen,Zhiqing Wang,Jiawei Liu,Hua Li
In an effort to address the solvothermal control synthesis issues of hexagonal upconversion nanocrystals (UCNCs) without additional co-doping, especially for NaYbF4:Er, we find for the first time that the mostly used sodium sources of NaOH and sodium oleate function through a totally unexpected NaF–HF pathway rather than the commonly accepted pathway of each of them. Specifically, NaOH reacts with NH4F and converts to nano-sized NaF completely in methanol, leading to reduced NH4F decomposition/HF generation in NaOH based synthesis. By contrast, sodium oleate-oleic acid hybrid suppresses NaF generation, leading to enhanced NH4F decomposition/HF generation in sodium oleate based synthesis. HF-flask SiO2 reaction, HF-to-NaF etching and HF tail gas were also detected for the first time. Results show the nano-sized NaF and in situ generated HF play key roles in the formation of cubic monomers and the cubic-to-hexagonal transition of UCNCs, respectively. Inspired by these results, a facile binary sodium strategy was proposed to achieve control synthesis of high-quality and small-sized hexagonal UCNCs via simultaneous regulation of nano-sized NaF and HF levels. HF was also verified as an origin of Ostwald ripening for UCNCs. The impacts of Ostwald ripening on the evolution of UCNCs were thus investigated. Our findings not only offer an advanced growth mechanism, but also present an effective control synthesis tool for UCNCs.
研究领域:
材料科学
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纳米技术
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无机化学
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发光材料
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稀土纳米材料
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DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2019
·
IF 3.571
Jinming Wang,Jiarong Yang,Xiaofang Cheng,Rui Xiao,Yangfei Zhao,Huimiao Xu,Yaya Zhu,Zipeng Yan,Mohammad Mehdi Ommati,Ram Kumar Manthari,Jundong Wang
Excessive fluoride mainly causes skeletal lesions. Recently, it has been reported that an appropriate level of calcium can alleviate fluorosis. However, the appropriate concentration and mechanism of calcium addition is unclear. Hence, we evaluated the histopathology and ultrastructure, DNA fragmentation, hormonal imbalances, biomechanical levels, and expression of apoptosis-related genes after treating the rats with 150 mg/L NaF and different concentrations of CaCO3. Our results suggested that NaF induced the histopathological and ultrastructural injury, with a concomitant increase in the DNA fragmentation (P < 0.05) and serum OC (17.5 ± 0.89 pmoL/L) at 120 days. In addition, the qRT-PCR and western blotting results indicated that NaF exposure upregulated the mRNA and protein expression of Bax, Calpain, Caspase 12, Caspase 9, Caspase 7, Caspase 3, CAD, PARP, and AIF while downregulated Bcl-2 (P < 0.01) and decreased the bone ultimate load by 27.1%, the ultimate stress by 10.1%, and the ultimate deformity by 23.3% at 120 days. However, 1% CaCO3 supplementation decreased the serum OC (14.7 ± 0.65 pmoL/L), bone F content (P < 0.01), and fracture and breakage of collagen fibers and changed the expression of endoplasmic reticulum pathway-related genes and proteins at 120 days. Further, 1% CaCO3 supplementation increased the bone ultimate load by 20.9%, the ultimate stress by 4.89%, and the ultimate deformity by 21.6%. In summary, we conclude that 1% CaCO3 supplementation alleviated fluoride-induced bone damage by inhibiting endoplasmic reticulum stress and mitochondrial dysfunction.
研究领域:
药理学
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毒理学
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生物学
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病理学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junying Xiao,Zhidong Pan,Ti Zhang,Youjun Lu,Yanmin Wang
Mica/(Ni, Sb)-co-doped rutile yellow composite pigment with a high near-infrared reflectance was prepared via mechanochemical pretreatment and subsequent sintering. (Ni, Sb)-co-doped rutile yellow pigment was synthesized by a solid-phase method in the presence of sodium fluoride (NaF) as a mineralizer, and mica was peeled by ultrafine grinding . The pigment, mica and mica/pigment composite were characterized by X-ray diffraction, laser diffraction particle size analysis , nitrogen gas adsorption method, scanning electron microscopy, energy dispersive spectroscopy, ultraviolet–visible–near-infrared spectroscopy, CIE L * a * b * color scales, and infrared irradiation image, respectively. The results show that the temperature of synthesizing a pure rutile pigment in solid-phase reaction is reduced by 100°C due to the addition of mineralizer NaF. (Ni, Sb)-co-doped rutile pigment has better color rendering performance and near-infrared (NIR) reflectance. Ultrafine grinding produces the finer flatty mica particles with fresh reflective surfaces, thus improving NIR reflectance of peeled mica. In mica/pigment composite prepared via mechanochemical pretreatment and subsequent sintering, peeled mica has a synergistic effect on (Ni, Sb)-co-doped rutile pigment particles to further scatter near-infrared radiation through the multiple layer reflections, leading to a better heat insulation . The high near-infrared reflectance of composite pigment increases to 97.72%, and the b * value of the pigment synthesized with 1 wt% NaF is 37.77. For the irradiation infrared lamp, the surface temperature of aluminum plate coated with mica/(Ni, Sb)-co-doped rutile yellow composite pigment is 40.1 ± 0.2°C, which is lower than that of aluminum plate uncoated determined by thermal camera and thermocouple. When aluminum plate coated with mica/(Ni, Sb)-co-doped rutile yellow composite pigment is under sunshine, its surface temperature is 38.6 ± 0.2°C. In addition, the mechanism of preparing the composite pigment via mechanochemical pretreatment and subsequent sintering and the multiple structure reflection effect on peeled mica surface coated with (Ni, Sb)-co-doped rutile yellow pigment particles were also discussed.
研究领域:
材料科学
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化工
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颜料技术
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热绝缘
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Yonghui Yang,Hengwei Yan,Pengchen Yang,Zhanwei Liu,Guang Yang
The segregation of aluminum-silicon alloys directly impacts the mechanical and chemical properties of the alloys, Therefore, homogenization of alloys is of great significance for alloys. This study initially investigated the electrochemical behavior of aluminum (III) and silicon (IV) during the preparation of aluminum-silicon (Al-Si) alloys in NaF-AlF 3 -Al 2 O 3 -SiO 2 molten salts through cyclic voltammetry and steady-state polarization. The results revealed that Al 2 O 3 underwent one-step reduction to Al, whereas SiO 2 underwent a two-step reduction process to Si. In addition, electrolysis experiments were carried out in a NaF-AlF 3 -Al 2 O 3 -SiO 2 -5wt%CaF 2 -1wt%MgF 2 -2wt%LiF molten salt system with molecular ratio of 2.4. These experiments involved variations in current density, electrolysis time, Al 2 O 3 and SiO 2 additions. It is worth noting that under the conditions of current density of 0.7 A/cm 2 , electrolysis time of 2 h, and silica addition of 2 %, the reduction rate of silicon reached a maximum value of 72.57 %, at which time the silicon in the aluminum-silicon alloys showed a dendritic structure, which was uniformly distributed throughout the entire alloy, and the segregation of the alloy was effectively avoided.
研究领域:
材料科学
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电化学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Chong He,Xinger Liu,Cong Ma,Yueqi Cao,Feng Hou,Liwen Yan,Anran Guo,Jiachen Liu
Nowadays, 3D polymer-derived silicon oxycarbide ceramics (SiOC) can be fabricated by the stereolithography method successfully. However, due to their intrinsically poor ceramic content and the large thermal shrinkage during the pyrolysis, it is difficult for the bulk 3D polysiloxane precursors to be pyrolyzed into dense 3D-ceramics. Herein, the ceramic content of the photocurable polysiloxane precursors was increased by adding a large amount of SiO 2 powders into the low solid content epoxy-acrylic siloxane. After being added with proper dispersant, the viscosity of the high solid loading polysiloxane/SiO 2 slurry can reach a proper level. Bulk 3D-silica ceramics with the wall-thickness around 8 mm can be conveniently fabricated from the polysiloxane/SiO 2 slurry by stereolithography and a two-step sintering process. The addition of a proper sintering aid NaF can promote the 3D-PSO/SiO 2 precursor to be converted into dense and crack-free 3D-silica ceramics with good mechanical proprieties.
研究领域:
材料科学
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陶瓷工程
·
增材制造
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yuna Lang,Baolin Wang,Ming-Wei Chang,Renyuan Sun,Longfei Zhang
Dental caries is the most common chronic infectious disease in the human oral cavity and current anti-caries drugs may cause drug resistance and microecological imbalance. In this study, a sandwich-structured electrospun pH-responsive dental paste was engineered via the layer-by-layer electrospinning technique. The top and bottom layers of the dental paste were pH-sensitive layers prepared with Methylmethacrylate polymers IV (E100), and the middle layer was the polylactic acid (PLA) membrane loading with sodium fluorides (NaF). Herein, the surface morphology , chemical as well as physical properties, drug release behaviors, biocompatibility and antibacterial properties of the dental paste were investigated. It was found that the sandwich liked structure enhanced the mechanical properties of the dental paste. The drug release curves of NaF-loaded dental pastes showed that NaF released rapidly and massively in the simulated oral fluid with a risk of dental caries. While in the simulated healthy oral fluid, NaF released slowly and in small amounts. And the dental paste maintained excellent hydrophobic , biocompatibility and antibacterial properties against Streptococcus mutans. Therefore, this sandwich-structured dental paste could respond to pH environment and achieve anti-caries smartly, indicating clinical potential in caries prevention.
研究领域:
牙科学
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材料科学
·
药学
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DOI
高影响因子
CRYSTENGCOMM
·
2020
·Vol. 22
·期 38
·6330-6338
·
IF 3.117
Chunyan Cheng,Yueshan Xu,Gejihu De,Jianxun Wang,Wei Wu,Yuexing Tian,Shasha Wang
Rare-earth doped upconversion nanoparticles (UCNPs) have attracted wide-ranging interest due to their potential applications in bioimaging and biolabeling, where a high emission intensity and small particle size are needed. However, common synthesis processes can be somewhat complex or require additional reactants, and the use of small-size NPs is limited by their weak luminescence intensity. In this work, uniform, monodisperse ∼5 nm β-NaGdF4:20% Yb/2% Er NPs were synthesized via a simple one-pot synthesis method in the high boiling-point solvents 1-octadecene (ODE) and oleic acid (OA) using a single dose of NaF at an ultralow NaF concentration of NaF/RE = 4. The effects of NaF/RE, the reaction temperature, and the reaction time on the size and phase of the particles were investigated. High-quality β-NaGdF4:20% Yb/2% Er@β-NaGdF4:20% Yb/10% Nd core–shell NPs with a size of ∼13 nm, enhanced UC luminescence, long UC lifetimes (τ) for green (τ ≈ 150 μs) and red (τ ≈ 105 μs) emission under 980 and 808 nm excitation, revealed via lifetime imaging, and obvious emission in the near-infrared (NIR) II region were synthesized. The synthesized core–shell NPs may result in a decrease in the overheating effect and allow for a deep penetration depth when further used for bioimaging applications. This work could inspire the synthesis of other high-quality RE-doped UCNPs via adding a single dose of a small amount of NaF and could lay the foundation for the use of Gd-based UCNPs in biomedical applications.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
Frontiers in Pharmacology
·
2021
·
IF 5.811
Xiao Qing,Liu Qi-Meng,Jiang Ru-Chao,Chen Kai-Feng,Zhu Xiang,Ma Lei,Li Wei-Xi,He Fei,Huang Jun-Jun
Previous studies have indicated that α1D/1A antagonist naftopidil (NAF) suppresses prostate growth by decreasing cell proliferation without affecting apoptosis and prostate volume in benign prostatic hyperplasia (BPH). A NAF-derived α1D/1A antagonist 1- benzyl-N-(3-(4-(2-methoxyphenyl) piperazine-1-yl) propyl)-1H-indole-2- carboxamide (HJZ-12) has been reported from our laboratory, which exhibits high subtype-selectivity to both α1D- and α1A- AR (47.9- and 19.1- fold, respectively) with respect to a1B-AR in vitro. However, no further study was conducted. In the present study, a pharmacological evaluation of HJZ-12 in BPH was performed on an estrogen/androgen-induced rat BPH model and human BPH-1 cell line. In vivo, HJZ-12 exhibited better performance than NAF in preventing the progression of rat prostatic hyperplasia by not only decreasing prostate weight and proliferation (similar to NAF) but also, shrinking prostate volume and inducing prostate apoptosis (different from NAF). In vitro, HJZ-12 exhibited significant cell viability inhibition and apoptotic induction in BPH-1 cell line, without presenting cell anti-proliferation properties. Intriguingly, the role of HJZ-12 on cell viability and apoptosis was an α1-independent action. Furthermore, RNA-Seq analysis was applied to screen out six anti-apoptotic genes (Bcl-3, B-lymphoma Mo-MLV insertion region 1 [Bmi-1], ITGA2, FGFR3, RRS1, and SGK1). Amongst them, Bmi-1 was involved in the apoptotic induction of HJZ-12 in BPH-1. Overall, HJZ-12 played a remarkable role in preventing the progression of prostatic hyperplasia through α1-independent apoptotic induction, indicating that it will be a multi-target effective candidate for BPH treatment.
研究领域:
药理学
·
泌尿学
·
分子生物学
·
细胞生物学
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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）