Journal of Macromolecular Science Part B-Physics
·
2023
·
IF 1.4
He Ding,Sige Huang,Xiaofan Liu,Zongyi Deng,Minxian Shi,Zhixiong Huang,Yue Wu
In order to investigate the effect of refractory metal on the high temperature properties of phenolic resin matrix composites, modified quartz fiber reinforced ceramizable composites were prepared by a molding process with a refractory component, tungsten, as the functional component and boron carbide as the ceramic forming agent. The effects of the tungsten and the boron carbide on the heat resistance of the composite were investigated. The results showed that the introduced refractory metal tungsten and the boron carbide can react to form tungsten borides and tungsten carbides at high temperature, and form a ceramic layer on the surface of the composite, which can fill the defects caused by pyrolysis of matrix and improve the high temperature performance of the composite. When the content of boron carbide was 10 wt% and the content of tungsten powder was 30 wt%, the flexural strength of the composite before and after heat treatment at 1200 °C were increased by 54.6% and 30.2% respectively compared with that without filler.
研究领域:
材料科学
·
复合材料
·
高温材料
·
陶瓷材料
·
聚合物基复合材料
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Gaili Ke,Feng Duan,Binyao Liu,Xiaotian Liu,Jinyu Wen,Bi Jia,Xiaoyan Liu,Huichao He,Yong Zhou
In theory, suitable metal ions doping into the surface of BiVO 4 photoanodes could improve its water oxidation performance effectively. But the common homogeneous reaction strategy is not well applicable for the preparation of BiVO 4 film photoanodes with metal ions surface doping. Herein, a photoelectrochemical treating approach was reported to prepare BiVO 4 films with W or Mo surface doping in saturated tungstate and molybdate-containing electrolyte, respectively. The doping of W or Mo into the surface of BiVO 4 film was attributed to the following reactions. Firstly, the photocorrosion of BiVO 4 film photoelectrodes resulted in the dissolution of VO 4 3+ from BiVO 4 lattice under AM 1.5 G illumination. Then, the WO 4 2+ or MoO 4 2+ in the saturated electrolyte entered and occupied the dissolved sites of VO 4 3+ on BiVO 4 surface through ions exchange reaction . Due to the lower radiative recombination of carrier as well as higher electrocatalytic water oxidation activity, the resultant W or Mo doped BiVO 4 films as photoanodes showed better solar water oxidation activity, kinetics and stability, although their light harvesting property and morphological feature were close to the pristine BiVO 4 film photoanode. The present work provides a new and effective approach for the achievement of metal ions doping into the surface of BiVO 4 photoanodes, which could inspire the preparation of similar photoanode materials.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Baofeng Zheng,Yanhua Song,Zhibo Zheng,Yanxia Zhao,Qing Yang,Zhan Shi,Bo Zou,Haifeng Zou
A novel green-light-emitting silicon-based oxynitride phosphor Ca4Y3Si7O15N5:Eu2+ with low thermal quenching and ideal pressure sensitivity is reported. The Ca3.99Y3Si7O15N5:0.01Eu2+ phosphor can be efficiently excited by 345 nm ultraviolet light and shows very low thermal quenching (integrated and peak emission intensities at 373 and 423 K were 96.17, 95.86, and 92.73, 90.66% of those at 298 K, respectively). The correlation between high thermal stability and structural rigidity is investigated in detail. The white-light-emitting diode (W-LED) is assembled by depositing the obtained green-light-emitting phosphor Ca3.99Y3Si7O15N5:0.01Eu2+ and commercial phosphors on a ultraviolet (UV)-emitting chip (λ = 365 nm). The CIE color coordinates, color rendering index (Ra), and corrected color temperature (CCT) of the obtained W-LED are (0.3724, 0.4156), 92.9, and 4806 K, respectively. In addition, when subjected to in situ high-pressure fluorescence spectroscopy, the phosphor exhibits an evident red shift of 40 nm with an increase in pressure from 0.2 to 32.1 GPa. The phosphor has the advantage of high-pressure sensitivity (dλ/dP = 1.13 nm GPa–1) and visualization with pressure changes. The possible reasons and mechanisms are deeply discussed in detail. Based on the above advantages, Ca3.99Y3Si7O15N5:0.01Eu2+ phosphor is expected to have potential applications in W-LEDs and optical pressure sensing.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.5
Sulafa B.H. Hashim,Haroon Elrasheid Tahir,Amer Ali Mahdi,Mohammad Rezaul Islam Shishir,Gobinath Marappan,Hamza A.M. Abaker,Alaa K.M. Khogly,Halah Aalim,Naymul Karim,Xiaodong Zhai,Shi Jiyong,Zou Xiaobo
This study investigated the effects of mechanical treatments, namely magnetic stirring (S), high-shear homogenization (HS), and ultrasonication (150, 300, and 600 W), on the sugarcane wax-based oil-in-water (O/W) emulsion and its integration into carboxymethyl cellulose (CMC)-based packaging films. The objective was to tackle issues, such as hydrophilic properties in CMC films and wax particle aggregation, by enhancing emulsion characteristics. Of the formulations, S/HS/300 W exhibited superior performance, attaining homogenous particle sizes ≤1 μm, a low polydispersity index (21.12), and a high ζ-potential (−41.55 mV), signifying improved stability. It also showed enhanced thermal stability, reduced crystallinity, and valuable rheology. Incorporating the S/HS/300 W emulsion into CMC films markedly improved water resistance, elevated hydrophobicity (115.5° water contact angle), decreased water vapor permeability by 23%, offered UV light protection dropped by 0%, decreased visible light transmission, and boosted mechanical qualities; the tensile strength rose by 34.2%. This study underscores the efficacy of mechanical processing in the production of high-performance films for sustainable packaging.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CATALYSIS
·
2026
·
IF 6
Xiaoxiao Duan,Shu Liu,Haiping Li,Xiuling Jiao,Yuguo Xia,Dairong Chen
Proton exchange membrane water electrolysis (PEMWE) offers a sustainable route for hydrogen production but remains limited by the instability of acidic oxygen evolution reaction (OER) catalysts. Ruthenium dioxide (RuO 2 ), though highly active, suffers from lattice oxygen participation leading to Ru dissolution and structural collapse. Here, we introduce a cooperative co-doping strategy that integrates tungsten (W) and silicon (Si) into the RuO 2 lattice to resolve the activity-stability dilemma. Structurally, W substitution induces local lattice strain that promotes Si incorporation, and the co-doping of large-radius W and small-radius Si balances lattice distortion and yields W-O-Ru-O-Si bridge motifs. These orbitally coupled sites modulate Ru-O covalency and suppress lattice-oxygen participation by ∼97%, thereby strongly suppressing Ru loss. The optimized catalyst delivers low overpotentials and exceptional durability, maintaining 8000 h at 10 mA cm −2 and 300 h at 1 A cm −2 in PEMWE cells. The synergistic dual-site coupling of W and Si decouples activity and stability locally while integrating them through cooperative orbital interactions, offering a rational design concept for durable Ru-based acidic OER catalysts and efficient PEMWE systems.
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2026
·
IF 3.9
Jiaman Wang,Zekai Cui,Yuechang Wei,Zhiling Tang,Jing Xiong,Yingli Wang,Xiong Wang,Xuanzhen Li,Yunpeng Liu,Zhen Zhao
The efficiency of electron utilization and C–C coupling is crucial to the selectivity of photocatalytic CO2 reduction to multicarbon (C2+) hydrocarbon products. Herein, the multifunctional catalyst of TiO2-modified W18O49 nanospheres (TimWOx) was successfully fabricated by in situ growth hydrothermal method. The distinct interfacial energy between W18O49 and TiO2 can promote the charge redistribution at the asymmetric Ti–O–W active sites and facilitate the formation of an internal electric field (IEF). Photogenerated electrons driven by the IEF can improve the dynamic electron shuttling between Ti and W centers for enhancing electron utilization efficiency during CO2 photoreduction. TimWOx catalysts exhibit high activity for photocatalytic CO2 reduction to C2+ products, i.e., the yield and selectivity of C2H4 over Ti0.25WOx are 46.3 μmol·g–1 and 72.01%, respectively, which is 7.25 times that of pristine W18O49. Combined with the results of in situ diffuse reflectance infrared Fourier transform spectra and DFT calculations, the photocatalytic mechanism is proposed: the protonation the *OCCOH intermediate is key step for selective photocatalytic CO2 reduction into C2H4, and the energy barrier for the protonation of the *OCCOH intermediate is lowered by IEF-induced dynamic electron shuttling, which selectively steers the reaction pathway toward C2H4 formation. This work highlights the role of interfacial electric fields in guiding electron shuttling for selective photocatalytic C–C coupling, which benefits developing highly efficient photocatalysts.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Weijie Jiang,Jiaming Li,Xue Cai,Wanping Li,Hang Jiang,Bingtian Zhao,Yunxing Li
Porous polymer microspheres have attracted considerable interest in biomedicine, catalysis, and adsorption. However, their practical applications remain limited because poor biocompatibility restricts biomedical use, whereas cumbersome fabrication processes hinder scalable production and precise structural control required for catalytic and adsorption applications. Herein, we report a facile and green strategy for fabricating porous calcium alginate microspheres using oil-in-water-in-oil Pickering double emulsions as templates. Hydrophobic silica nanoparticles are used to stabilize the emulsion interfaces, while alginate dissolved in the intermediate aqueous phase undergoes in situ ionotropic gelation. The gelation process is triggered by the gradual release of Ca 2 + from ethylenediamine tetraacetic acid calcium disodium (EDTA-Ca) complexes during glucono-δ-lactone (GDL) hydrolysis. This one-step approach enables regulation of microsphere morphology and internal structure by adjusting the concentrations of GDL, EDTA-Ca, and alginate. As a proof of concept for delivery system, bovine serum albumin was efficiently encapsulated within the porous microspheres, and its release behavior could be regulated by varying the protein loading and environmental pH. By avoiding synthetic surfactants, this green and scalable strategy provides a versatile platform for the fabrication of biocompatible porous microspheres, with promising applications in controlled delivery, protein and enzyme immobilization, tissue engineering, and related advanced applications. Download: Download high-res image (182KB) Download: Download full-size image A facile and green strategy using Pickering double emulsions as templates successfully fabricates porous calcium alginate microspheres which achieve efficient protein encapsulation and pH-responsive controlled release.
✓ 已验证
DOI
高影响因子
IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Zhenpeng Men,Lucan Xiao,Ragini Singh,Bingyuan Zhang,Santosh Kumar
In this work, a sensitive and portable fiber-optic WaveFlex biosensor is developed for the detection of paraoxon pesticide in agricultural products. A combination of simulation and experiment is used to analyze the distribution of the evanescent field in optical fiber. The flexible W-shaped optical fiber biosensor (OFB) based on localized surface plasmon resonance (LSPR) effect is developed, also known as WaveFlex biosensor. Gold nanoparticles (AuNPs) were immobilized on the surface of the optical fiber probe to successfully excite the LSPR phenomenon. In addition, in order to modify the optical fiber probe, cerium dioxide nanorods (CeO2-NRs) and tungsten disulfide quantum dots (WS2-QDs) were functionalized. It is used to enhance the biocompatibility of the sensor and increase the specific surface area of the fiber probe. The enzymatic determination of organophosphorus pesticides (OPs) is usually based on cholinesterase and organophosphorus hydrolase. Paraoxon has an irreversible inhibitory effect on butyrylcholinesterase. The content of paraoxon was detected by the inhibitory effect of paraoxon on butyrylcholinesterase. The reproducibility, reusability, stability, selectivity, and pH tests of the W-shaped WaveFlex sensor and its application in real samples are evaluated using different concentrations of paraoxon solution. The linear range of the sensor is 0– $100~\mu $ g/mL, and the limit of detection (LoD) is $7.999~\mu $ g/mL. The sensitivity is as high as 0.0312 nm/( $\mu $ g/mL), which verifies that the sensor provides an indispensable technology, cost-effective and portable solution for paraoxon-specific detection.
研究领域:
环境科学
·
生物传感技术
·
农业科学
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Zhenfei Li,Hui Ye,Pengkai Shan,Qing Ni,Lin Sun,Yifeng Zheng
Co-free Bi 0.5 Sr 0.5 FeO 3-δ perovskite as a novel oxygen electrode shows good electrochemical performance for solid oxide electrolysis cells (SOECs). In this work, W-doped Bi 0.5 Sr 0.5 Fe 1-x W x O 3-δ (BSFWx, x = 0, 0.05, 0.1, and 0.15) perovskite oxides were prepared and evaluated for CO 2 electrolysis in SOECs to further promote its oxygen catalytic activity. All the samples maintain a single-phase structure, and the BSFW0.1 sample presents the lowest polarization resistance value of about 0.067 Ω cm 2 , which is 47 % smaller than that of the BSF sample. Moreover, the BSFW0.1 half-cell exhibits good stability for 84 h under 0.5 A cm −2 anodizing polarization at 800 °C. The fuel electrode-supported BSFW0.1 single cell reaches a current density of 0.63 A cm −2 , which is an improvement of approximately 33.8 % compared with of BSF under 1.5 V when the temperature and feed gas are 800 °C and 50 % CO 2 –50 % CO, respectively. This prominent performance is ascribed to creating more oxygen vacancies concentration by W doping, which promotes the transport of oxygen species. These outstanding electrochemical properties demonstrate that BSFW0.1 oxide is a promising potential oxygen electrode electrocatalyst for CO 2 electrolysis in SOECs.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Xinkuai He,Xu Chen,Zhousi Hu,Yiren Li,Jingjing Du,Luye Wu
Hydrogen energy, as a sustainable and efficient energy option, possesses immense potential to address energy shortages and mitigate climate change impacts. To advance alkaline water electrolysis, the development of effective and robust non-noble metal catalysts is essential. This study reports “coral island-like” structure Co-Ni-W ternary alloy electrode materials synthesized via electrodeposition in an ethylene glycol (EG) organic solvent. By precisely controlling W 6+ concentration, Co-Ni-W ternary alloys with excellent hydrogen evolution reaction (HER) catalytic performance are obtained. Cyclic voltammetry (CV) records demonstrated that Co 2+ and Ni 2+ are capable of facilitating the reduction of W 6+ , and the co-deposition of Co-W, Ni-W and Co-Ni-W alloys is governed by a typical induced co-deposition mechanism. The W content significantly affects the HER catalytic performance of the Co-Ni-W ternary alloys, increasing initially and then decreasing. The Co 46 Ni 29 W 25 ternary alloy displays an optimal HER catalytic activity and stability with an electrochemical active surface area (ECSA) of 1925 cm 2 and a hydrogen evolution overpotential ( η 10 ) of 63 mV. This study demonstrates that Co-Ni-W ternary alloy is a potential contender for alkaline water electrolysis hydrogen evolution.
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2022
·
IF 3.752
He ZHANG,Zhi-bo LI,Xiao-chun DENG,Ben CHEN,Guo-hua ZHANG,Kuo-Chih CHOU
Ultrafine oxide dispersion strengthening (ODS)-Mo and ODS-W alloy powders containing different types of oxide nanoparticles were successfully synthesized by spraying method (solid−liquid mixing method) combined with the reductions with carbon black and hydrogen in sequence. It is concluded that the solution concentration and type of rare earth oxide have no effect on the grain size of ODS-Mo alloy powder, but have obvious effect on that of ODS-W alloy powder. The higher the concentration of rare earth solution is, the smaller the average grain size of ODS-W alloy powder is. Furthermore, compared with doping with CeO 2 , the grain sizes of reduction products of La 2 O 3 and Y 2 O 3 doped WO 3 are relatively larger. Compared with the undoped case, there is almost no change for grain size of ODS-Mo alloy powder, while the grain size of ODS-W alloy powder becomes much larger. This is probably due to the appearance of the composite oxide (such as La 2 WO 6 ) formed by the reaction between tungsten oxide and rare earth oxides, which promotes the heterogeneous nucleation and growth of tungsten grains during the reduction process of ODS-W, while there is no complex oxide composed of molybdenum and rare earth oxides in the reduction process of ODS-Mo.
研究领域:
材料科学
·
冶金学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 46
·26318-26324
·
IF 2.936
Xianbin Huang,Jinsheng Sun,Kaihe Lv,Jingping Liu,Haokun Shen
This study presents an alternative method to enhance the emulsion stability of oil based drilling fluids (OBMs). Modified dimer acid (MDA) was synthesized with a molecular structure having two hydrophilic heads and two hydrophobic tails. Theoretically, the adsorption of MDA on an oil–water interface makes it possible to increase hydrogen bonding between water droplets and form three dimensional networks which benefit emulsion stability. The influence of MDA on the stability of base emulsions was studied by visual observation. Then the stabilization mechanism of MDA was analyzed from the micro and macro points of view by morphology study using a cryo-scanning electron microscope (cryo-SEM) and rheological measurements including viscosity vs. shear rates, zero-shear viscosity (η0), and creep and recovery tests. Experimental results showed that a substantial improvement in emulsion stability was visually observed when the MDA concentration was 2 g L−1. From cryo-SEM observation, a honeycomb structure was observed in the emulsion containing 2 g L−1 MDA, which can provide a physical barrier to restrain the movement of water droplets. In comparison with the rheological behaviors of the emulsion without MDA, a remarkably larger zero-shear viscosity, a solid-like behavior and a greater elasticity were observed when 2 g L−1 MDA was present. Finally, the application in OBMs shows that MDA can largely enhance electrical stability (ES) and reduce the filtration volume. The method proposed in the paper could be used to enhance the stability of w/o emulsions in a variety of fields.
研究领域:
化学工程
·
石油工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）