Materials
·
2025
·Vol. 18
·期 9
·2007
·
IF 3.2
Bo Xiao,Xia Zhang,Yongzhao Hou,Fagang Wang,Guangwu Wen
SiC-W2B5/C composites were prepared through a novel and simple processing route (reaction hot-pressing). The density of composites increased from 96.1% to 99.2% with the increase in SiC content from 5 to 30 vol%, leading to significant improvements in mechanical properties such as flexural strength, fracture toughness, and Vickers hardness, which for the highest W15S30 composite were measured at 292.3 MPa, 6.12 MPa·m1/2, and 3.32 GPa, respectively. The fracture morphology exhibited a mixed fracture mode of transgranular and intergranular, along with a pull-out phenomenon, indicating a well-combined interface. The sintering process involved Si powder acting as a liquid-phase sintering agent, reacting with B4C to increase the B concentration and promote the generation of W2B5, as well as reacting with the carbon phase to generate a transition phase of Si-B-C. The presence of this transition phase enhanced the interface bonding strength and catalyzed the graphitization process. As the SiC content increased, the promotion effect became more pronounced, with the degree of graphitization increasing from 59.2% to 66.2%.
研究领域:
材料科学
·
陶瓷材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Lun Pan,Tahir Muhammad,Lu Ma,Zhen-Feng Huang,Songbo Wang,Li Wang,Ji-Jun Zou,Xiangwen Zhang
ZnO is an important semiconductor that has been widely applied in solar cell, photocatalysis, environmental remediation. Doping and morphology control are important approaches to improve its photocatalytic performance. Herein, a facile two-step calcination method was developed to fabricate carbon(C)-doped cubic ZnO with porous structure from zeolite imidazolate frameworks (ZIF-8). Compared with one-step pyrolysis, the approach of two-step calcination not only retains the cubic morphology with inter-connected ZnO nanoparticles and porous structure but also introduces C doping in ZnO lattice effectively. This morphology has advantage in charge transfer, optical absorption and mass transfer during the photoreaction, and C doping results in high charge-separation efficiency. The sample C350-400 (C-doped ZnO, firstly calcined at 350 °C for 2 h from ZIF-8, then 400 °C for 1 h) shows the maximum photoactivity, which is ca . 3-fold and 4-fold higher than ZnO (C450) in photodegradation and PEC water splitting (under UV–vis irradiation), respectively. It is expected that the preparation of metal oxide from MOF is a very promising way to fabricate highly efficient photocatalyst.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Chenli Wu,Shihao Su,Lei Wang
C-lignin is a linear aromatic biopolymer with a uniform structure and acid resistance formed by catechol monomers linked through unique benzodioxane bonds. Compared to the heterogeneous guaiacyl (G)/syringyl (S)-lignin, the homogeneous nature of C-lignin enables its efficient depolymerization into a single catechol product, making it more suitable for downstream processing. This study investigated effects of various Brønsted acids and Lewis acids in a dimethyl isosorbide (DMI) /H 2 O co-solvent system on the C-lignin extraction from castor shells. Results show H 2 SO 4 assisted DMI/H 2 O co-solvent enables the most efficient disassembly of C-lignin containing sample with a yield of 95 mg/g castor shells. Quantitative 13 C NMR analysis indicates that the molar concentration of caffeyl alcohol units in the lignin is 2.06 μmol/mg, corresponding to 34.2 % C-lignin by weight at 120 °C within 2 h. The obtained C-lignin can be selectively converted to catechol derivatives (yield: 89 mol%) via Pd/C catalysis. This study demonstrates efficient pretreatment and utilization of C-lignin, offering a promising potential approach for its industrial uses.
研究领域:
生物化学
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材料科学
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产品关联
DOI
高影响因子
VACUUM
·
2025
·
IF 3.9
Fan Wang,Junqi Pan,Guozhi Wu,Zhangna Hu,Areeje Fatima,Jiarui Huang
The large radius of sodium ions induces significant volume expansion in the anode during charging and discharging, potentially damaging the electrode structure and leading to the deterioration of the battery's cyclic performance. In this work, Cu/Fe bimetallic oxalate nanorod precursors were prepared via a liquid-phase precipitation process and subsequently calcined in air to form bimetallic oxides. These oxides were then coated with resorcinol-formaldehyde resin and subjected to carbonization and selenization process to fabricate porous carbon-coated CuFeSe 2 (CuFeSe 2 @C) nanorod composite materials. Electrochemical studies confirmed that the CuFeSe 2 @C electrode represented stable cycling performance as an anode for Na + battery. Notably, this electrode had a reversible capacity of 295.8 mAh g −1 after 3500 cycles at a current density of 10.0 A g −1 . The interstitial space between the conductive carbon layer and the active material mitigates volume expansion, reduces fragmentation or detachment of the active material, enhances the stability of the cycling and service life of battery.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 8
·1702827
·
IF 9.598
Erling Li,Fa Yang,Zhemin Wu,Yong Wang,Mingbo Ruan,Ping Song,Wei Xing,Weilin Xu
Herein, a type of Fe, N-codoped carbon electrocatalyst (FeN x /C, Fe-N-BCNT#BP) containing bamboo carbon nanotubes and displaying bifunctional high catalytic efficiency for both oxygen reduction reaction (ORR) and carbon dioxide reduction reaction (CO2RR) is reported. It shows high electrocatalytic activity and stability for both the ORR process with onset potential of 1.03 V RHE in alkaline and the CO2RR to CO with high faradic efficiency up to 90% and selectivity of about 100% at low overpotential of 0.49 V. For CO2RR to CO, it is revealed that Fe 3 C is active but the activity of FeN x centers is lower than that of C–N-based centers, contrary with that observed for ORR. Due to its low cost and high electrocatalytic performance for these two reduction reactions, the obtained catalyst is very promising for extensive application in future. The revealed huge activity difference of the same types of active sites for different reactions can efficiently guide the synthesis of advanced materials with multifunction.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Hualong Wu,Yanxia Zhao,Jiexi Wang,Xiaoyan Li,Kaimin Shih,Xuguang Li,Wei Liu
Resource recycling from waste-water and sludge is an important part of the 14th Five-Year Plan in China. The emerging titanium-based coagulants have drawn growing attentions due to their strong coagulation capability in water purification and value-added Ti-loaded sludge production. Management and recovery of the high value-added sludge into functional nanomaterials is highly significant for both sludge reduction and environmental remediation. The present study was carried out to investigate the recycle of the coagulated Ti-loaded sludge to produce functional C/TiO 2 composites as the anode materials for lithium-ion batteries (LIBs). It is the first time that the application of the Ti-loaded wastewater sludge derived C/TiO 2 was evaluated for LIBs. The experimental results showed that the carbon coating through in-situ carbonization of the sludge produced the C/TiO 2 composites with a high specific surface area, stable structural integrity, and excellent electrochemical properties that would facilitate Li + diffusion in long-term LIBs usage. The C/TiO 2 composites calcinated from the polytitanium sulfate-coagulated sludge at 800°C (N 2 ) exhibited the best electrochemical performance during the cycling tests (601 mAh/g at 100 mA/g after 200 cycles). The research work demonstrates the promising prospect of the recycle and value-added utilization of the Ti-loaded sludge in the production of high-performance C/TiO 2 composites for energy storage applications. This study provides a new way for the management and reuse of Ti-loaded waste-sludge.
研究领域:
环境科学
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材料科学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 16
·
IF 2.7
Zhao Dongpeng,Li Jun,Bai Han,Wu Huantong,Chen Xiping,Sun Guangai,Zhou Zhongxiang
Consistent c -axis orientation characteristics toward the direction of applied pressure of Y -type BaSrCo 2 Fe 11 AlO 22 (BSCFAO- θ ) were successfully prepared by the strategy of hot pressing. The samples’ magnetoelectric coupling performance was greatly enhanced by the strategy of hot pressing than that of the traditional solid reaction method. The magnetoelectric current of BSCFAO- θ ( θ = 0°) (12.06 μ A/m 2 ) was nearly 5 times higher than BSCFAO- SS (2.24 μ A/m 2 ). The magnetoelectric polarization of BSCFAO- θ ( θ = 0°) (32.82 μ C/m 2 ) was nearly 4 times higher than that of BSCFAO- SS (8.31 μ C/m 2 ). The magnetoelectric coupling coefficients of BSCFAO- θ ( θ = 0°) (1880 ps/m) were nearly 4 times higher than those of BSCFAO- SS (404 ps/m). The enhancement of magnetoelectric polarization of BSCFAO- θ ( θ = 0°) can be attributed to the uniform c -axis orientation, which reinforced magnetoelectric polarization compared with none orientation that eliminated the magnetoelectric polarization on grain boundaries. The magnetoelectric coupling performance of BSCFAO- θ presented a gradually decreasing trend with the angle changing from 0° to 90° for the changing of orientation. Compared with traditional solid reaction methods, the strategy of hot pressing inhibits grain growth and increases grain boundaries, thus facilitating the enhancement of grain boundaries’ resistivity, and the electrical resistivity of BSCFAO- θ (3.08 × 10 10 Ω cm) was nearly 10 000 times higher than that of BSCFAO- SS (2.5 × 10 6 Ω cm), which also benefits the magnetoelectric polarization performance of BSCFAO- θ . Therefore, the hot-pressing strategy can contribute to the forming of oriented ceramics and enhance the grain boundaries’ resistivity to improve magnetoelectric coupling performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Vietnam Journal of Chemistry
·
2023
·Vol. 61
·期 2
·204-209
·
IF 0.9
Nguyen Van Vinh Ha,Nguyen Thi Thu Ha,Ong Ngoc Khanh,Dinh Truc Phuong,Ho Thanh Nhat,Nguyen Thanh Tung
Herein we reported a method for copper pivalate mediated, directed functionalization of ortho C−H bonds in (2-methylthio)aniline benzamides. Diaryl disulfides were used for thiolation, while successful phenoxylation was obtained with phenol as the coupling agent. Our report marks a rare example for flexible transformation of benzamide C(sp 2 )−H bonds into the corresponding unsymmetrical diaryl ethers and thioethers.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2024
·
IF 5.9
Yanping Ren,Xiaoqiang Fan,Kaiyue Lin,Shipeng Chen,Minhao Zhu
The preparation of a low shearing shell on the surface of carbon spheres (CS) is an attractive strategy to improve the lubrication properties of CS. In this study, core–shell structural C@Ag particles were prepared using CS as the hard core and Ag nanoparticles as the soft shell. Then, the additives were mixed with Polyalphaolefin 20 to prepare the C@Ag core–shell-enhanced lithium complex grease (C@Ag-LCG). The physicochemical properties, corrosion resistance, and tribological behaviors of LCGs were investigated. C@Ag-LCG exhibited the best high-temperature resistance and colloidal stability compared with the CS-enhanced lithium complex grease (LCG) and pure LCG. The dropping point and oil separation rate of 0.05 wt% C@Ag-LCG were 255 °C and 2.36 %, respectively. The tribological behavior of greases was tested using a four-ball friction tester, and the main damage mechanism was abrasive wear. The C@Ag additive reduced the average friction coefficient and wear spot diameter by 27.17 % and 26.12 %, respectively. The improved properties were attributed to the synergistic lubrication of hard CS core and soft Ag shell with the rolling, filling, and self-repairing effects, C@Ag deposit films and the self-lubricating oil film, as well as the thickener film and the tribochemical film at the frictional interfaces.
研究领域:
材料科学
·
润滑工程
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产品关联
DOI
高影响因子
PHYTOTHERAPY RESEARCH
·
2025
·
IF 6.3
Yichao Du,Junjie Bai,Tingting Ma,Ziming Wu,Pengru Wang,Xiaolin Zhong,Wenguang Fu,Shuixiang He
Liver fibrosis, a pivotal pathological feature in the progression of chronic liver injury, currently lacks effective therapies. Sinomenine (SIN), a bioactive alkaloid derived from traditional Chinese medicine, demonstrates diverse pharmacological properties. However, its therapeutic potential and mechanisms in liver fibrosis remain inadequately characterized. This study investigates the anti-fibrotic effects of SIN and its underlying molecular mechanisms. The anti-fibrotic efficacy of SIN was evaluated in two murine models of liver fibrosis induced by carbon tetrachloride (CCl 4 ) or bile duct ligation (BDL), along with transforming growth factor-beta 1 (TGF-β1)-stimulated rat hepatic stellate cells (HSC-T6). Serum biochemical markers, histopathological analyses (Hematoxylin–Eosin, Sirius red, and Masson's trichrome staining), immunofluorescence, and immunohistochemistry were employed to assess hepatic injury and collagen deposition. Western blotting elucidated molecular mechanisms. SIN administration significantly attenuated hepatic injury in CCl 4 - or BDL-induced mice, as evidenced by reduced transaminase levels and improved histopathological features. In both in vivo and in vitro models, SIN suppressed fibrogenesis by decreasing collagen deposition and downregulating expression of α-smooth muscle actin (α-SMA), matrix metalloproteinase 2 (MMP2), and collagen I. Mechanistically, SIN inhibited the TGF-β/SMAD pathway through reduced phosphorylation of SMAD2/3 and attenuated c-JUN signaling via diminished phosphorylated c-JUN levels. Pretreatment with TP0427736 (a SMAD2/3 inhibitor) or SP600125 (a c-JUN inhibitor) synergistically enhanced SIN-mediated α-SMA suppression in HSC-T6 cells. SIN ameliorates liver fibrosis through inhibition of TGF-β/SMAD and c-JUN signaling pathways. These findings position SIN as a promising therapeutic candidate for liver fibrotic disorders.
研究领域:
药理学
·
肝脏病学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 2
·期 19
·6796-6800
·
IF 0
Yusheng Xia,Xuxin Pu,Jie Liu,Jie Liang,Pujun Liu,Xiaoqing Li,Xibin Yu
Various-sized arrays of CuO nanoleaves (NLs) were fabricated on a pyramid-textured c-Si wafer. The CuO NL/c-Si solar cells show a great increase of the optical absorption and a reduction of the reflectance in the 250–1250 nm wavelength range, compared to the reference one. The c-Si solar cell integrated with CuO NLs generates the graded index of refraction between the surface of Si and air, and improves the light utilization efficiency by increasing the light-trapping effect and forming resonant optical modes, which leads to multiple scattering of the incident light. In addition, the deposition of p-type CuO NLs on the surface of the Si wafer can form a CuO NL/c-Si junction and generate a built-in potential, which is beneficial for the separation of photogenerated electrons and holes, leading to the minority carrier lifetime (τeff) increase from 5.7 to 15.0 μs. The CuO NL/c-Si structure reduces the optical loss, improves the carrier collection, and distinctly enhances the c-Si solar cell efficiency. The experimental results indicate that short-circuit current and power conversion efficiency of CuO NL/c-Si solar cells increase by 10.30% and 17.90%, respectively. The CuO NL/c-Si structure is expected to exceed the Shockley–Queisser limit of the single junction solar cells.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
TETRAHEDRON LETTERS
·
2018
·
IF 2.125
Rongxing Zhang,Shengzhou Jin,Yuanxing Wan,Sen Lin,Zhaohua Yan
A novel, efficient, and green protocol to construct C–S bond has been developed via HBr/H 2 O 2 -mediated sulfenylation of styrenes and 4-hydroxycoumarins leading to unsymmetrical sulfides. Various unsymmetrical sulfides were prepared in one step with moderate to good yields using environmentally-friendly H 2 O 2 as oxidant and HBr as catalyst. Based on the preliminary experimental results, a plausible reaction mechanism was proposed for HBr/H 2 O 2 -mediated formation of C–S bond with thiosulfates .
研究领域:
有机化学
·
绿色化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）