INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2022
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IF 4.804
Xiao-Chun Deng,He Zhang,Guo-Hua Zhang
Combining spray drying and in-situ synthesized technology, WC-10Co cemented carbides with uniform composition was prepared by vacuum sintering to investigate the effects of different CeO 2 contents (0 wt%, 0.5 wt%, 1 wt%, 2 wt%, 4 wt%) as well as co-doping with CeO 2 and VC on the microstructure and mechanical properties . With increasing CeO 2 addition from 0 wt% to 0.5 wt%, the WC grain size decreased from 0.79 ± 0.35 μm to 0.62 ± 0.24 μm. The hardness, fracture toughness and transverse rupture strength (TRS) of the alloy with 0.5 wt% CeO 2 all reached the maximum values of 1752 ± 28 HV 30 , 18.50 ± 0.35 MPa·m 1/2 and 2245 ± 35 MPa, respectively, which indicated that the mechanical properties of cemented carbide could be simultaneously improved by adding 0.5 wt% CeO 2 to refine the WC grains. However, as the CeO 2 content increased to 4 wt%, the hardness gradually decreased, while the fracture and TRS all slightly decreased first and then tended to be stable. Moreover, the corrosion resistance of alloys first increased and then decreased with the increase of CeO 2 content. The 0.5 wt% CeO 2 alloy had the best corrosion resistance. After adding 0.5 wt% VC, the grain size of alloys became smaller and distribution of Co binder was more uniform. Compared to the samples with only added CeO 2 , the alloy with co-addition of 0.5 wt% CeO 2 and 0.5 wt% VC exhibited the best comprehensive mechanical properties. The hardness, fracture toughness and TRS of the alloy with co-addition of 0.5 wt% CeO 2 and 0.5 wt% VC were 1987 ± 44 HV 30 , 16.10 ± 0.34 MPa·m 1/2 and 2023 ± 78 MPa, respectively.
研究领域:
材料科学
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冶金学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Kai-Fei Wang,Xiao-Hui Yang,Xiao-Chun Deng,Kuo-Chih Chou,Guo-Hua Zhang
WC-12Co- x VC cemented carbides were synthesized using an in-situ synthesis method consisting of precursor formation, deoxidization and carbonization-sintering steps. The experimental results showed the mean grain size of the WC in the sintered alloys decreased from 1.05 to 0.46 and 2.13–0.57 µm, corresponding to the VC content from 0 to 2 wt% at 1350 °C and 0–6 wt% at 1400 °C. V 4 WC 5 thin-layer was generated in the final sintered sample with low VC addition. As the VC content increased to more than 2 wt%, the V 4 WC 5 with larger particles size were generated except the V 4 WC 5 thin-layer, which would effectively enhance the hardness of WC-12Co-VC cemented carbides. The fracture toughness reached the maximum value of 16.45 MPa·m 1/2 for WC-12Co-2VC sintered at 1350 °C for 2 h; while the Vickers hardness reached the maximum value of 2124 HV for WC-12Co-6VC sintered at 1400 °C for 2 h, respectively.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
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2023
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IF 4.3
Mohammad Zahir Akbari,Yifeng Xu,Chuanzhou Liang,Zhikun Lu,Siyuan Shen,Lai Peng
Nanocomposite-based photocatalytic degradation of sulfamethoxazole (SMX) is frequently used for wastewater treatment. However, applying various nanoparticles led to different removal efficiencies and levels of environmental toxicity. Herein, we synthesized and characterized ZnO@VC to enhance the photocatalytic degradation of SMX. Effects of SMX concentration, catalyst dosage, pH, water matrix and role of reactive oxygen specious (ROS) were evaluated. Results confirmed 97.69±0.95% (5 mg L −1 SMX/0.05 g L −1 catalyst) removal efficiency followed pseudo-first-order kinetic. Higher SMX concentration and higher catalyst dosage reduced degradation efficiency because of the prevention of catalyst active-sites and limiting light availability. SMX removal efficiency was slightly reduced in synthetic wastewater (SWW) and tap water (TW) by anions scavenging ROS. Due to pH reliance of SMX anionic-density, the degradation efficiency was positively and negatively impacted by acidic and basic environment, and pH values below and over the catalyst point of zero charge (PZC), respectively. Quenching test revealed that some specious of ROS play more important role in photocatalytic degradation of SMX. Two degradation pathways of SMX photocatalytic decomposition were described. The synthesized catalyst showed good stability in terms of reusability. The results revealed that ZnO@VC with high detoxification ability (97%) could be a promising photocatalyst for treatment of antibiotics from water and wastewater.
研究领域:
环境科学
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材料科学
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毒理学
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2021
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IF 6.901
Rui Jia Liu,Ling Xu Yang,Jiang Tao Wu,Huan Peng Bu,Hui Jun Liu,Chao Liu Zeng,Chao Fu
Nanosized VC with an average particle size of ∼40 nm was synthesized by disproportionation of V(IV) ions on acetylene black template in molten (Na,K)Cl at 950 °C holding for 5 h. The as-synthesized VC has exhibited desirable electrochemical performances as an anode in lithium-ion batteries (LIBs), delivered a reversible discharge capacity of 597.8 mAh g −1 at 0.1 A g −1 and ∼397.8 mAh g −1 at 0.5 A g −1 in 200 consecutive cycles. It is noteworthy that nanosized VC also displayed impressive charge-discharge capacities in sodium-ion batteries (SIBs), released ∼252.5 mAh g −1 at 0.1 A g −1 . This work provides a new insight into the preparation of high-performance carbide ceramics as anodes in metal-ion batteries.
研究领域:
材料科学
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能源存储
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Chaoqun Tan,Xu Lu,Xinxin Cui,Xinchi Jian,Zhixian Hu,Yujie Dong,Xiaoyu Liu,Juan Huang,Ling Deng
An easily recyclable nanocomposite ascorbic acid-modified Fe 3 O 4 (VC@Fe 3 O 4 ) was synthesized, characterized, and evaluated as a green heterogeneous catalyst for activation of peroxymonosulfate (PMS). The structures of fresh and used VC@Fe 3 O 4 were well characterized by TEM, XRD, FTIR, and XPS. The catalytic activity comparison between Fe 3 O 4 and VC@Fe 3 O 4 was performed under different parameters for depletion of sulfadiazine (SD). Additionally, scavenging tests and in-situ electron paramagnetic resonance (EPR) tests were applied to discern the primary radicals generated in the VC@Fe 3 O 4 /PMS system. The results indicate that the VC@Fe 3 O 4 possesses a higher catalytic activity towards PMS compared with Fe 3 O 4 for SD removal, and the observed pseudo first rate constant ( k obs ) were 7.24 × 10 −2 min −1 for the VC@Fe 3 O 4 /PMS system and 1.05 × 10 −2 min −1 for the Fe 3 O 4 /PMS system, correspondingly. 56.6% SD removal efficiency was obtained with 0.3 mM PMS and 0.8 g/L VC@Fe 3 O 4 under pH 7.0. A large amount of hydroxyl radicals (OH ) and a few number of sulfate radicals (SO 4 − ) were discerned by the hyperfine splitting constant values and scavenging results. Mechanisms on the peroxymonosulfate activation and radical generation in the VC@Fe 3 O 4 /PMS system were supposed. Results indicate that VC would obviously boost the cycle of Fe 2+ -Fe 3+ on surface of VC@Fe 3 O 4 nanoparticles and newly generated Fe 2+ can continuously be consumed to activate PMS, which is answer for the rapid generation of reactive radicals (OH , SO 4 − ). At last, mineralization and degradation pathway were also investigated. The findings of this study suggest that VC@Fe 3 O 4 is a novel effective catalyst in activation of peroxymonosulfate under neutral pHs.
研究领域:
环境科学
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催化化学
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水处理技术
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产品关联
DOI
高影响因子
ACS Applied Energy Materials
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2025
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IF 5.5
Jun Yuan,Duo Pan,Zheng Bo,Yangjie Liu,Jiaqi Yu,Lihong Xu,Hongbing Zhan,Xiang Hu,Zhenhai Wen
Sodium ion hybrid capacitors (SIHCs) are garnering substantial interest in the energy storage field due to their unique capability to integrate high energy density and power density with the economic advantages of abundant sodium resources. However, the kinetic mismatch between battery-type anodes and capacitor-type cathodes presents a significant obstacle, severely limiting the performance potential of high-performance SIHCs. Herein, we report the development of a favorable pseudocapacitive Na+ storage nanohybrid, featuring VC nanodots confined within an N-doped carbon nanofiber network (VC@N-CNFs), which has been successfully applied to SIHCs. The integration of VC nanodots with a conductive carbon fiber framework significantly enhances electron transport and provides ample interface between the electrolyte and VC active material, thereby effectively improving the reaction kinetics of the anode. Consequently, the VC@N-CNFs demonstrate exceptional sodium storage capability, achieving a high capacity of 160.2 mA h g–1 at 1 A g–1 after 2000 cycles. Thanks to the favorable kinetic matching between the anode and cathode, the assembled SIHCs exhibit high energy and power densities of 97.8 W h kg–1 and 4118.3 W kg–1, respectively, alongside remarkable cycling performance, retaining 73.5% of their capacity after 6000 cycles.
研究领域:
材料科学
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能源存储与转换
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产品关联
DOI
高影响因子
LANGMUIR
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2025
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IF 3.9
Xianmin Gong,Shijun Xu,Yiling He,Kaijun Wei,Quangang Chen,Qing Yuan,Yi He,Yi Fan,Xingtao Cheng
Metal-based composite coatings have been widely studied for their excellent properties. In order to improve the properties of nickel tungsten boron (Ni–W–B) matrix, Ni–W–B/PC coatings were prepared by electrodeposition in the presence of polydopamine functionalized VC (P–VC) and cerium oxide (CeO2) nanoparticles. The effect of cerium oxide content in the nanomaterials on the properties of Ni–W–B coatings was investigated. The results showed that the prepared coatings were dense, uniform, and crack-free, and the best performance was achieved at a cerium oxide content of 2 g/L. The addition of CeO2 nanoparticles can fill the tiny defects in the coating and optimize the coating structure. The addition of these two materials refines the size of the coating grains. In terms of coating performance, the corrosion resistance of the composite coating was enhanced with the addition of CeO2 at a certain P–VC concentration, and the total impedance of the composite coating was 24,030 Ω·cm2, which was 4.8 times higher than that of the Ni–W–B coating and 1.7 times higher than that of the Ni–W–B/P–VC coating. In addition, the hardness of the Ni–W–B/PC-2 composite coating reached 1033.93 HV at a CeO2 content of 2 g/L. The wear resistance of this composite coating was also optimized. Compared with the Ni–W–B/P–VC composite coating, the average coefficient of friction was reduced by 8.8%, and the wear resistance of the composite coating was further improved, which was attributed to the synergistic effect of the two materials. Moreover, the Ni–W–B/PC film has excellent hardness and corrosion resistance, which is promising for the application in harsh environments.
研究领域:
材料科学
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表面工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yonggang Lei,Kim Hoong Ng,Yucheng Zhu,Yingzhen Zhang,Zengxing Li,Shen Xu,Jianying Huang,Jun Hu,Zhong Chen,Weilong Cai,Yuekun Lai
Seeking an efficient and stable cocatalyst is of importance for semiconductor-based photocatalytic water splitting to produce hydrogen. In this sense, Mo-activation of VC for better cocatalytic properties was proposed for the first time, aiming to attain improved hydrogen generation of CdS . Our novel, yet facile physical preparation method permits intimate coupling of Mo-activated VC cocatalyst to CdS (through electrostatic attraction force), thereby promises drastic activity enhancement for hydrogen generation. Results indicate the best VC-activating competency of Mo against other transition metals (Co, Fe, Ni, Zn and Cu), which induces highest H 2 productivity of CdS after modifying with Mo-activated VC. Under optimum setting, CdS/Mo(0.38)-VC(5 wt%) manifested highest photocatalytic hydrogen production rate of 2267 μmol h −1 g −1 , associated to 300 % and 440 % improvement as compared to that of CdS/VC(5 wt%) and pure CdS, respectively. Such activity also outperformed those that yielded by MoS x - or noble metals(Pt, Au or Ag)-co-catalyzed CdS, attributed to the promoted interfacial charges transfer and lowered overpotential of CdS/Mo(0.38)-VC(5 wt%) in hydrogen generation. Correspondingly, high apparent hydrogen production quantum efficiency of 4.3 % was also recorded by the same photocatalyst at 420 nm. In term of stability test, CdS/Mo(0.38)-VC(5 wt%) manifested excellent longevity in 24 h continuous photoreaction and fair recyclability over five consecutive photoreaction cycles. This work provides a new insight to cocatalysts design and synthesis, thereby realizing economic alternatives to precious metal (Pt, Au, Ag) in solar-derived H 2 production.
研究领域:
材料科学
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化学工程
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催化
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可再生能源
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DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
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2024
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IF 8.7
Yunxiang Que,Yao Zhang,Fengxiang Liang,Liping Wang,Yiting Yang,Jingbo Zhang,Wanting Wang,Ying Sun,Changjiao Zhong,Haipeng Zhang,Chengguang He,Lili Guan,Hongxia Ma
Adhere to the concept of low-carbon environmental protection and turning waste into treasure, polysaccharides from Flammulina velutipes residue polysaccharide (FVRP) has been developed and possesses diverse bioactivities, comprising antioxidant, hypoglycemic, and relieving heavy metal damage, which still has the disadvantages of high molecular weight and low bioavailability. The current work is the first to prepare a degraded polysaccharide (FVRPV) from FVRP by ultrasonic assisted H 2 O 2 -Vc technique in order to reduce its molecular weight, thereby improving its activity and bioavailability. Our results found that the molecular weight and average particle size were declined, but the monosaccharide composition and characteristic functional group types of FVRPV had no impact. The structural changes of polysaccharides analyzed by XRD, Congo Red test, I 2 -KI, SEM, and methylation analysis indicated that the surface morphology and glycosidic bond composition of FVRPV possessed longer side chains and a greater number of branches with an amorphous crystal structure devoid of a triple helix configuration, and had experienced notable alterations after ultrasonic assisted H 2 O 2 -Vc treatment. Meanwhile, the in vitro antioxidant capacity of FVRPV had significantly increased compared to FVRP, implying ultrasonic assisted H 2 O 2 -Vc technique maybe a effective method to enhance the bioactivity of polysaccharides. In addition, the content of polysaccharide, reducing sugar, and uronic acid in FVRPV was significantly decreased, but antioxidant capacity of fermentation broth was stronger by in vitro human fecal fermentation. The 16S rDNA sequencing data displayed that FVRPV can enrich probiotics and reduce the abundance of pathogenic bacteria through different metabolic pathways mediated by gut microbiota, thereby exerting its potential probiotic effects. The interesting work provides a novel degraded polysaccharide by ultrasonic assisted H 2 O 2 -Vc technique, laying a foundation for developing FVRPV as a new antioxidant and prebiotic.
研究领域:
食品科学
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生物技术
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生物化学
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微生物学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Wenrong Cai,Yanjing Shi,Datong Wu,Junyao Li,Laidi Xu,Yong Kong
This work proposes a novel dual-signal electrochemiluminescence ( ECL) immunosensor based on energy resonance transfer (RET) for the detection of β2-Microglobulin (β2-MG). Introducing carbon vacancy into g-C 3 N 4 (V C -g-C 3 N 4 ) can lead to the narrowing of the band gap and the reduction of LUMO, thereby significantly enhancing the ECL efficiency of the material. Meanwhile, Zr-MOF can effectively load Ru(bpy) 3 2+ (Ru-Zr-MOF), enabling its stable existence on the electrode. The ECL emission spectrum of V C -g-C 3 N 4 overlaps well with the fluorescence excitation spectrum of Ru-Zr-MOF, indicating an effective ECL-RET effect between them. As the concentration of β2-MG increases, the intensity of anodic ECL signal gradually increases, while the intensity of cathodic ECL signal gradually decreases. The difference between the cathodic and anodic ECL signals has a good linear relationship within the concentration range from 0.2 pg/mL to 200 ng/mL, with a detection limit of 27.73 fg/mL. The constructed immunosensor can be used for practical analysis in human serum. The proposed sensor has great potential in clinical detection of β2-MG, providing new insights for biomolecular detection and disease diagnosis.
研究领域:
生物化学
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分析化学
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生物医学工程
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临床诊断
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产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Xianmin Gong,Yi He,Liping Yan,Huilian Zhou,Yiling He,Kaijun Wei,Quangang Chen,Shijun Xu
In this study, vanadium carbide (VC) was used as the raw material to synthesize PDA-functionalized VC (P-VC). VC and P-VC were added as nanoreinforced materials to the Ni–W–B coating. The effects of the two nanomaterials on the morphology, wear resistance, and corrosion resistance of the Ni–W–B coatings were investigated and compared. The experimental results show that the surface of the Ni–W–B/P-VC coating is denser and more uniform than that of the Ni–W–B and Ni–W–B/VC coatings, and there are no obvious defects on the surface. According to the hardness test, the Ni–W–B/P-VC coating reaches the highest microhardness of 887.1 HV. According to the friction and wear tests, the Ni–W–B/P-VC coating has the shallowest scratches, the lowest average friction coefficient (COF = 0.274), and the lowest wear rate (9.578 × 10–8 mm2/N). The corrosion resistance is the best, the corrosion rate is 0.0456 mm/y, and the impedance value Rt reaches 14,501 Ω·cm2.
研究领域:
材料科学
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表面工程
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涂层技术
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
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2025
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IF 9.8
Wudan Cai,Shuai Chen,Xiao Zhang,Dan Wu,Xinyi Zhu,Honglin Zhu,Yangchao Luo,Qilin Huang
The current study aimed to investigate the effect of ultrasound assisted H 2 O 2 /Vc degradation on the digestive characteristics of Lignosus rhinocerotis polysaccharide (LRP) and gut microbiota regulation. Results showed that during in vitro digestion, no changes were observed in molecular weight ( M w ) of LRP and its antitumor activity remains stable. However, M w of degraded LRP (DLRP) slightly decreased from 45.66 × 10 4 Da to 36.61 × 10 4 Da with no free monosaccharides released, enhancing its antitumor activity. The supplementation with LRP or DLRP significantly elevated mice fecal water content and modulated microbiota composition. The total short chain fatty acids concentration of control, LRP, and DLRP groups were 20.07, 24.13, and 28.08 mmol/L, respectively. Compared with LRP, DLRP significantly increased the abundance of beneficial bacteria such as Alloprevotella and Mucispirillum , exhibiting protective effects on intestinal health. This study provides a theoretical foundation for targeted regulation of intestinal flora by LRP and DLRP.
研究领域:
食品科学
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微生物学
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药理学
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生物技术
✓ 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）