SEPARATION SCIENCE AND TECHNOLOGY
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2025
·
IF 2.3
Shijie Tang,Jiaxue Li,Hailin Yang,Ming Duan,Shenwen Fang
This study evaluated the thermal and electrical dehydration performance of eight polyether amines with varying molecular weights and HLB values for W/O crude oil emulsion breaking before and after alkylation modification. The experimental results demonstrated that the dehydration rates of polyether amine both before and after modification were less than 30%. However, all polyether amines can enhance the electrical dehydration rate, with the modified polyether amines having higher dehydration rate. Specifically, the modified polyether amine P20-H2.8 achieved a dehydration rate of 64.29% under conditions of 4 kV, 60°C, and a dosage of 200 mg/L, which is 2.25 times higher than that without any chemical agent addition. Interfacial property studies revealed that the modified polyether amines exhibited superior interfacial activity and stronger ability to reduce the elastic modulus of the oil-water interface under the electric field, thereby contributing to their better demulsification performance. Nevertheless, the electrical dehydration rate of the modified polyether amine P20-H2.8 was still much lower than that of conventional block polyether demulsifier, indicating a need for further improvement in interfacial activity. Although the research results of polyether amines are not very good, it expands the research direction of demulsifiers and provides some new insights for demulsifier development.
研究领域:
石油工程
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胶体与界面科学
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高分子化学改性
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产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Chen-Cheng Wan,Yan-An Li,Shan-Lin Zhang,Yuan Gao,Muhammad Bilal Hanif,Cheng-Xin Li
Traditionally, Ni-based cermet fuel electrodes have been extensively utilized in solid oxide electrolysis cells (SOECs) owing to their excellent conductivity and electrochemical catalytic activity. However, the development of alternative materials has gained attention due to concerns over Ni's susceptibility to carbon deposition and long-term stability issues. In the present study, we design W-doped Sr 0.9 Fe 0.67 Ti 0.3-x Co 0.03 O 3-δ (SFTCW, x = 0.01) as a novel hydrogen electrode material for SOECs. The results reveal that W doping promotes the precipitation of bimetallic Co-Fe alloy, thereby increasing the active sites within the material and preserves the original structure. In a reducing atmosphere, SFTCW demonstrates superior performance compared to SFTC in both Sc 2 O 3 stabilized ZrO 2-δ (ScSZ) and La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ (LSGM)-electrolyte supported cells. LSGM-based cells exhibit superior performance, 5 times higher than ScSZ-based cells, achieving an electrolysis current density of ∼1000 mA cm −2 and demonstrating considerable stability for up to 122 h, indicating the potential application of SFTCW for solid oxide electrolysis cells.
研究领域:
材料科学
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电化学
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能源工程
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无机非金属材料
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催化化学
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DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
·
2019
·Vol. 50
·期 10
·4827-4838
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IF 1.985
Liu Jun-Kai,Zhang Guo-Hua,Sun Guo-Dong
We propose a process to produce ultrafine W-10 wt pct Cu composite powders by reducing the mixtures of copper tungstate (CuWO 4 ) and tungsten trioxide (WO 3 ) (from the calcination of a mixture of ammonium paratungstate and copper nitrate trihydrate) with carbon black and hydrogen. First, ultrafine pre-reduced tungsten-copper (W-Cu) powders containing a small amount of WO 2 were produced by reducing mixtures of CuWO 4 and WO 3 with insufficient carbon black; then the obtained products were further reduced by hydrogen to remove the residual oxygen. This method provides a simple and low-cost route to prepare ultrafine W-10 wt pct Cu composite powders. The composite powders were sintered at different temperatures [1323 K (1050 °C), 1373 K (1100 °C), 1423 K (1150 °C), 1473 K (1200 °C), and 1523 K (1250 °C)] for 3 hours. A maximum densification of the obtained compact was achieved at a sintering temperature of 1523 K (1250 °C), with a relative density, Vickers hardness and thermal conductivity of the W-10 wt pct Cu composites of 97.8 pct, 365 HV and 165 W/m K, respectively.
研究领域:
材料科学
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冶金工程
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Hongchao Li,Di Gao,Kun Li,Mengde Pang,Senlin Xie,Rutie Liu,Jianpeng Zou
The tungsten diselenide (WSe 2 ) films with different orientation present unique properties suitable for specific applications, such as WSe 2 with a C-axis⊥substrate for optoelectronics and WSe 2 with a C-axis // substrate for electrocatalysts. Orientation control of WSe 2 is essential for realizing the practical applications. In this letter, a WSe 2 film has been prepared via rapid selenization of a magnetron-sputtered tungsten (W) film. The influence of the magnetron-sputtered W film on WSe 2 film growth was studied systematically. Scanning electron microscopy, X-ray diffractometry and high-resolution transmission electron microscopy were used to evaluate the morphology, microstructure and phase composition of the W and WSe 2 films. The substrate temperature has a significant effect on the W film phase composition, but little effect on the WSe 2 film orientation. The WSe 2 orientation can be controlled by changing the W film microstructure. A dense W film that is deposited at low pressure is conducive to the formation of WSe 2 with a C-axis⊥substrate, whereas a porous W film deposited at high pressure favors the formation of WSe 2 with a C-axis // substrate. A growth model for the WSe 2 film with different texture has been proposed based on the experimental results. The direction of selenium (Se) vapor diffusion differs at the top and side surfaces. This is a key factor for the preparation of anisotropic WSe 2 films. Highly oriented WSe 2 films with a C-axis⊥substrate grow from the dense W film deposited at low pressure because Se vapor can only diffuse into the W film from the top surface where it is converted into selenide. Highly oriented WSe 2 with a C-axis // substrate can be achieved for the porous W film that is deposited at high pressure because the nanopores provide a fast transmission tunnel for Se vapor diffusion. These findings will contribute to the controlled fabrication of WSe 2 film and provide a theoretical basis for its application.
研究领域:
材料科学
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无机非金属材料
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薄膜制备
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纳米材料
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表面科学
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半导体材料
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DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2020
·
IF 3.407
Weiqiang Hu,Zhi Dong,Hui Wang,Tansir Ahamad,Zongqing Ma
Oxide-dispersion-strengthened (ODS) tungsten based alloys with high performance were synthesized by optimized freeze-drying with PVP and PEG polymer dispersant additives and subsequent low temperature sintering . The pre-freezing principle developed firstly in our work shows that fast cooling rate and polymer dispersant additives contribute to the refinement and uniformity of precursor powders. The optimized freeze-dried W-Y 2 O 3 composite powders possess an average grain size of 9 nm, which can be attributed to the steric hindrance provided by polymer dispersants during freeze-drying and voids left by the decomposition of polymer dispersants during calcination . After sintering at low temperature, the W-Y 2 O 3 alloys have ultrafine W grain (210 nm) and nano second phase particles (<50 nm) dispersed in W matrix while maintaining a high relative density of 97.8%. These factors mentioned above lead to the microhardness and compressive strength as high as 721 ± 31 HV 0.2 , 814 MPa respectively, accompanied by a high total deformation plasticity of above 50%. These results indicate that the optimized freeze-drying and subsequent low temperature sintering is a promising way to fabricate ODS tungsten based alloys with high performance.
研究领域:
材料科学
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金属学与冶金工程
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纳米材料
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复合材料
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结构材料
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DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2024
·
IF 4.8
Shuai Ma,Di Dong,Mengyao Zhang,Ye Gao,Zhuangzhi Wu,Dezhi Wang
W-Re-HfC alloys have been extensively applied in the field of high-temperature structural parts. To ensure high temperature reliability, it is essential to enhance creep resistance ability. In this study, the microstructures of forged W-Re-HfC alloys were adjusted using different heat treatment processes . The corresponding tensile creep properties were also measured at 2000 °C with 40 MPa. Furthermore, a possible creep fracture mechanism was also explored. The forged W-Re-HfC sample annealed for 2 h exhibited the best creep performances with a steady-state creep rate of 3.28 × 10 −6 and a creep life of 5.6 h. Generally, a larger grain size indicates a lower steady-state creep rate; however, the precipitation of carbides at the grain boundaries (GBs) deteriorates the bonding strength of interfaces, thus reversing the former trend. The dominant creep mechanism is diffusion creep , in which the voids nucleate perpendicular to the GBs, grow and connect into cracks, ultimately leading to fractures.
研究领域:
材料科学
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金属学与热处理
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高温结构材料
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固态物理
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力学性能
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2018
·Vol. 38
·期 12
·2132-2140
·
IF 3.525
Lingfeng Li,Xiaolong Zhao,Donglai Pan,Guisheng Li
Photoactive WO 3 is attractive as a photocatalyst for green energy evolution through water splitting. In the present work, an electrochemical anodic oxidation method was used to fabricate a photo-responsive nanotube array-like WO 3 /W (NA-WO 3 /W) photoanode from W foil as a precursor. Compared with a reference commercial WO 3 /W electrode, the NA-WO 3 /W photoanode exhibited enhanced and stable photoelectrocatalytic (PEC) activity for visible-light-driven water splitting with a typical H 2 /O 2 stoichiometric ratio of 2:1 and quantum efficiency of approximately 5.23% under visible-light irradiation from a light-emitting diode ( λ = 420 nm, 15 mW/cm 2 ). The greatly enhanced PEC performance of the NA-WO 3 /Wphotoanode was attributed to its fast electron–hole separation rate, which resulted from the one-dimensional nanotube array-like structure, high crystallinity of monoclinic WO 3 , and strong interaction between WO 3 and W foil. This work paves the way to a facile route to prepare highly active photoelectrodes for solar light transfer to chemical energy .
研究领域:
材料科学
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物理化学
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能源化学
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纳米科技
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光催化
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电化学
·
可再生能源
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Xiangyong Zhang,Ting Guo,Tianying Liu,Kangyan Lv,Zhuangzhi Wu,Dezhi Wang
Tungsten phosphide (WP) has attracted increasing attention in hydrogen evolution reaction (HER) due to its unique catalytic and electronic properties. However, its high preparation temperature often leads to particle excess growth and coarsening. Although tremendous efforts have been made to enlarge the surface areas and reduce particle size, the required high preparation temperature still limits its development. Herein, a facile self-exothermic reduction strategy under an extremely low temperature (300 °C) is proposed to prepare the ultra-fine WP nanoparticles with rich W vacancies. Remarkably, as revealed by XRD , TEM , ICP-OES and XPS analysis, the crystallinity , W vacancies and electron distribution of WP can be well controlled. The W vacancies can activate the neighboring P atoms and the bridge sites as active sites for HER, but also will change the electron distribution , which in turn deteriorates the conductivity of WP. By means of controllable W vacancies, the optimized low crystalline WP catalyst with a moderate number of W vacancies can be obtained, exhibiting a superior HER activity in acidic solution with a small Tafel slope (52 mV dec −1 ), which are smaller than most of WP-based catalysts and among the best records. Furthermore, this work will open a new horizon for both preparation and HER performance improvement of other transition metal phosphides.
研究领域:
材料科学
·
催化
·
能量存储与转换
·
纳米技术
·
电化学
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DOI
高影响因子
COMPOSITE STRUCTURES
·
2019
·
IF 4.829
Baosong Li,Weiwei Zhang,Tianyong Mei,Shengsong Du,Dandan Li,Yicheng Miao
Ni-W-ZrO 2 -CeO 2 nanocomposites were prepared by pulse electrodeposition for high wear and corrosion resistance as a protective coating. The structure (morphology, phase composition, roughness, crystallite size , surface feature) and properties (hardness, wear and corrosion resistance) of the nanocomposites were evaluated by various methods. The formation mechanism of the nanocomposites were proposed. The results show that the nanocomposite coatings are dense with nodular-like structure. The cauliflower-like protrusion clusters were formed due to the ‘tip discharge effect’ in the uneven distribution of electric field. It demonstrated that these nanoparticles were homogeneously distributed in the Ni-W matrix. The presence of the nanoparticles in Ni-W matrix improved the hardness, wear and corrosion resistance . The combination of ceramic particles and rare earth oxide particles was an excellent reinforcement phase for Ni-W matrix. The sample obtained at 1000 Hz has the optimal hardness and wear resistance, as well as the satisfying corrosion resistance. The nanocomposite deposited for 10 min owns the superior corrosion resistance in the initial stage of immersion. Ni-W-ZrO 2 -CeO 2 nanocomposites own excellent performance and exhibit potential application values in harsh conditions.
研究领域:
材料科学
·
电化学
·
表面工程
✓ 已验证
DOI
高影响因子
Surface Topography-Metrology and Properties
·
2020
·Vol. 8
·期 3
·035014
·
IF 1.613
Weiwei Zhang,Cuicui Ji,Qiang Fu,Zhongquan Shi
In this work, the structure and properties of ZrO2 nanoparticle reinforced Ni–W, Ni–B and Ni–Cu matrix nanocomposite coatings were comparatively studied. Their surface morphology, composition, microstructure, topography, hardness, wear and corrosion resistance were examined by various methods . The nanocomposites exhibit dense, nodular-like morphology with nanocrystalline structure. The results show that the ZrO2 particles have homogeneously dispersed in the nanocomposites. The formation of the protrusion structure was partly attributed to the heterogeneous distribution of the electric field. The presence of ZrO2 nanoparticles could refine the crystallite size of the Ni–W, Ni–B and Ni–Cu alloy matrix to 12.5 ± 1, 10.5 ± 0.5 and 15 ± 0.1 nm, respectively. The corrosion resistance of these nanocomposites can be improved by the incorporation of ZrO2 nanoparticles into the alloy matrix. The Ra of Ni–W/ZrO2, Ni–B/ZrO2 and Ni–Cu/ZrO2 nanocomposites are about 53 ± 3, 69 ± 2, 18 ± 1 nm, respectively, expressing the rougher surface of Ni–B/ZrO2 compared to the others. It indicated that the composition of these alloy matrix have different crystallite size, which could affect the surface roughness of the electrodeposits. The inclusion of ZrO2 particles in Ni-based alloys could enhance its properties. The reinforcement effect of the anti-wear properties of the nanocomposites was proposed. The Rct value of the Ni–W–ZrO2, Ni–B–ZrO2, Ni–Cu–ZrO2 were 50.93, 105.18, 44.67 kΩ · cm2, respectively, indicating that the Ni–B–ZrO2 nanocomposite coating has the highest corrosion resistance. The Rct values depends on not only the composition of the coatings, but also the electrodeposition conditions, which influence the crystallize size and compactness of the electrodeposits. The order of the microhardness and anti-wear properties is Ni–W–ZrO2 > Ni–B–ZrO2 > Ni–Cu–ZrO2.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Xin Long,Jian Lan,Shanshan Dai,Hongsheng Lu,Na Wang,Baogang Wang,Yuanqiang Zhu
An instant dissolving W/O polymer prepared via reverse-phase emulsion polymerization. • An ultra-high acid resistance polymer formed from water-soluble hydrophobic monomers. • Integrated application for drag reducing and acidic thickening. • Quantum chemistry is used to clarify the mechanisms of dissolution and acid tolerance. Despite the considerable potential of multistage alternating acid fracturing Technique for unconventional tight reservoir stimulation, the integration of acid-thickening and drag-reduction functions within a single additive remains challenging due to the slow dissolution of gelling agents, poor acid resistance of drag reducers, and compatibility issues among multiple chemical additives. Herein, a multifunctional polymer emulsion (PAADT) was rationally designed using a hydrophobic monomer (AT-100) and a high-charge-density symmetric cationic monomer (Dimethyl Diallyl Ammonium Chloride, DMDAAC) to overcome these limitations. PAADT completely dissolved in water and concentrated HCl within 120 s and 330 s, respectively, while retaining viscosity stability for over 120 h and demonstrating exceptional tolerance to multivalent ions. Quantum chemical calculations, including LogP, independent gradient model based on Hirshfeld partition (IGMH), and electrostatic potential (ESP) analysis, revealed that the synergistic effect of polymer-water interactions and electrostatic repulsion governs the dissolution behavior and acid-salt resistance of PAADT. This work establishes a structure–property relationship between monomer architecture and macroscopic performance, providing a molecular design strategy for developing multifunctional polymers for complex environments. Download: Download high-res image (246KB) Download: Download full-size image
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产品关联
DOI
高影响因子
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
·
2025
·Vol. 38
·期 7
·075014
·
IF 4.2
Manikandan Krishnan,Jiaojiao Meng,Bai-zhuo Li,Yanmei Ma,Cao Wang,Dilip Bhoi,Yoshiya Uwatoko,Qiang Jing,Bo Liu
Structural, superconducting ground state, and normal state properties on Re-Os-W-Mo-Ta high-entropy alloys (HEAs) were investigated using powder x-ray diffraction, magnetization measurements, electrical resistivity analysis, and specific heat measurements. The structural phase transformation was found to develop through compositional variations of the primary elements of HEAs, leading to the formation of phases such as bcc-type Re23Os5W33Mo34Ta5, σ-type Re31Os18W23Mo23Ta5, and α-Mn-type Re33Os34W11Mo11Ta11. These impurity-free samples, displaying a single-phase structure, exhibit bulk superconducting behavior. Low-temperature specific heat analysis indicates that the bcc-type and σ-type HEAs exhibit weakly coupled, whereas the α-Mn-type HEA exhibits strongly coupled, isotropic and fully gapped superconductivity. Moreover, the stability of bcc-type, σ-type, and α-Mn-type HEAs is significantly influenced by key factors such as valence electron count and electronegativity differences. This study presents observations of structural transformations in HEAs driven by compositional variations without the introduction of additional elements, providing significant insights into the correlation between structural changes and superconducting properties in highly disordered systems.
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DOI
高影响因子
危险品化学品经营许可证（带存储）