SYNTHESIS-STUTTGART
·
2015
·Vol. 47
·期 23
·3751-3757
·
IF 2.689
Zhijie Li,Quan Wen,Lihong Zhou,Xingmei Deng,Qingle Zeng
The synthesis of highly important α-hydroxycarboxylic acid anilides via copper-catalyzed chemoselective C–N coupling reactions of α-hydroxyamides and aryl halides is described. This highly selective N-arylation process demonstrates wide substrate scope, cost savings and easy operation. In addition, the chirality of l-3-phenyllactamide is preserved during the reaction.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Jinhu Hu,Jialin Jiang,Qianlong Li,Jin Cao,Xiuhong Sun,Siqi Huo,Zhaolu Qin,Ye-Tang Pan
With the rapid development of electronic communication technology, the issue of electromagnetic pollution has become increasingly prominent. Developing multifunctional protective materials that combine efficient electromagnetic microwave (EMW) absorption with environmental durability is of great significance. Inspired by the multi-branched structure of coral, this study successfully fabricated FeC/C nanofiber EMW absorbers with a coral-like network structure through electrospinning and carbonization processes and applied them to polyurea (PUA) coatings. The microstructure, electromagnetic parameters, and performance modulation mechanisms of the materials were systematically investigated. The results indicate that the bioinspired coral-like network structure optimizes multiple scattering paths of EMW and impedance matching characteristics, enabling FeC/C nanofibers to exhibit excellent EMW absorption performance, with a minimum reflection loss (RL min ) of −67.24 dB at a thickness of 1.82 mm and an effective absorption bandwidth (EAB) of 5.24 GHz. When applied to PUA coatings, this structure not only significantly enhances the EMW absorption performance of the composites (with P-30 exhibiting a RL min of −62.67 dB at 2.0 mm and an EAB of 6.22 GHz), but also imparts hydrophobic properties to the P-40 sample by constructing a micro/nano-scale rough surface. Meanwhile, the mechanical properties are notably improved, with the tensile strength of P-40 reaching 23.04 MPa and the tear strength of P-20 reaching 41.73 MPa. This study provides new design insights and technical references for the development of novel bioinspired multifunctional coating materials that integrate electromagnetic protection, environmental durability, and mechanical strength.
研究领域:
材料科学
·
电磁学
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Song-Yi Liao,Jing Chen,Dao-Ren Deng,Cai-Yun Wu,Selina X. Yao,Yi Wang,Yu-Ming Ru,Xiao-Yan Li,Xu-Gang Shu,Yong-Gang Min
In this study, a hybrid composite of MXene loaded with carbon-coated Ni 0.96 S hollow nanobox (shortened as HC-Ni 0.96 S@MXene/C) is successfully synthesized. The micro-structure of HC-Ni 0.96 S@MXene/C is further analyzed by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) with EDS mappings. The results reveal that ∼550 nm Ni 0.96 S nanobox with ∼60 nm shell is effectively loaded on MXene nanosheets and encapsulated by a thin carbon layer. When evaluated as advanced anode for lithium-ion batteries (LIBs), HC-Ni 0.96 S@MXene/C achieves a specific capacity of 810.9 mAh g - 1 at 0.1 A g - 1 and remains 455.6 mAh g - 1 at 0.5 A g -1 after 200 cycles. Moreover, in sodium-ion batteries (SIBs), HC-Ni 0.96 S@MXene/C anode delivers 416.5 mAh g - 1 at 0.05 A g - 1 and maintains 201.4 mAh g - 1 at 0.5 A g - 1 after 400 cycles. Additionally, the HC-Ni 0.96 S@MXene/C anode demonstrates higher pseudo-capacitance effects of 81.6 and 92.5 % at a scanning rate of 1 mV s - 1 in LIBs and SIBs respectively. Moreover, the higher pseudo-capacitance effects in SIBs are according with the facts that the ionic diffusion coefficients of Na ions ( D Na + = 4.6 ∼ 40.6 × 10 -11 (discharge) and 1.7 ∼ 127.8 × 10 -11 (charge) cm 2 /s) are larger than those of Li ions ( D Li + = 1.1 ∼ 19.6 × 10 -11 (discharge) and 0.82 ∼ 32.6 × 10 -11 (charge) cm 2 /s) for HC-Ni 0.96 S@MXene/C anode. The excellent electrochemical performances of HC-Ni 0.96 S@MXene/C should be assigned to hollow Ni 0.96 S structure, carbon coating and conductive MXene nanosheets, which collectively alleviate volume changes during cycling, enhance electronic conductivity and accelerate ion diffusion respectively. This strategy of synthesizing HC-Ni 0.96 S@MXene/C may provide a guidance for designing advanced LIBs/SIBs anodes in the near future.
研究领域:
材料科学
·
能源存储技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2025
·
IF 3.6
Jiapeng Sun,Hanxiao Luo,Junyong Wang,Hongliang Li,Raorao Zheng,Dingru Qiao,Jiaji Zhao,Yue Yu,Hua Cao
A simple and practical method has been developed for the carbonylative esterification of imidazo[1,2-a]pyridines via C(sp2)–H bond functionalization using alkyl alcohols under mild reaction conditions. The carbonyl fragment is sourced from radical-mediated C–C cleavage of the alcohols, providing a green, safe, and economic alternative to traditional carbonyl sources like carbon monoxide. Through this strategy, a number of imidazo[1,2-a]pyridine-3-carboxylates were obtained from simple substrates by a single step.
研究领域:
有机化学
·
绿色化学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Tianwen Liu,Wei Yuan,Mengyao Si,Xiaoning Wang,Xiangping Liu,Xiaoying Wang
The concentration fluctuations of cellular-myelocytomatosis oncogene (c-Myc) protein may be related to a variety of tumors such as lymphoma, therefore, detection of abnormal trace-level changes is of great significance for early predictions. Conventional detection methods suffer from time-consuming analytical processes and insufficient sensitivity. Thus, the development of a sensitive detection method for c-Myc protein in blood is particularly crucial. We developed an electrochemical sensor for the sensitive detection of c-Myc protein based on gold–palladium alloy nanoparticles (AuPd NPs), leveraging its dual-function for both electrode modification and signal tag. Specifically, AuPd NPs were rapidly formed on the electrode surface by electrodeposition techniques to anchor the capture antibodies (Ab I ), which can increase the conductivity and load capacity of the electrode. Subsequently, using toluidine blue (TB) as a reducing agent, TB-AuPd was synthesized in one step, and further utilized to anchor the detection antibodies (Ab II ), which improved the load quantity and electrocatalytic activity of TB. When the target was present, the sandwich sensor was successfully constructed, benefiting from dual amplifications to achieve sensitive detection of c-Myc protein. Eventually, the proposed sensor exhibited a wider linear range (1–1000 pg mL −1 ) and a lower detection limit (0.5 pg mL −1 , S/N = 3). The developed method demonstrated strong concordance with commercially available ELISA kits, with no statistically significant difference observed in detection results. Thus, the proposed sensor realized sensitive detection of c-Myc protein, and can render valuable guidance for prospective clinical test applications.
研究领域:
生物医学工程
·
肿瘤学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Wei Wen,Chunying Wang,Xudong Chen,Jingyi Wang,Yaobin Li,Fei Wang,Wenpo Shan,Ping Ning,Kai Li
Two-dimensional materials have garnered significant attention in the field of catalysis due to their high electron transfer efficiency. In this study, a quasi-two-dimensional carbon–nitrogen doped cobalt-based catalyst (Co-N-C (F)) was synthesized for the investigation of formaldehyde (HCHO) oxidation at room temperature. The electronic coordination structure of the catalyst was modified by varying the calcination temperature, resulting in the formation of Co-N 4 sites that enhance the degradation of the intermediate formate. Additionally, the quasi-2D structure formed during high-temperature pyrolysis retains characteristics of the ZIF 3D material, with a high specific surface area and a porous aggregation structure, which further enhances the exposure of active centers and diffusion of the feed gas. Characterization results showed that the number of Co-N 4 sites on the catalysts increases with the rise in pyrolysis temperature, with the Co-N-C (F)-1000 catalyst exhibiting the highest concentration of Co-N 4 sites. Activity test results indicated that the Co-N-C (F)-1000 catalyst achieved a 100 % HCHO removal rate at 25 °C, with WHSV 200,000 mL/(g·h). In contrast, the activity of the Co-N-C (F)-1100 catalyst decreased, which could be attributed to the aggregation of Co particles at excessively high temperatures. The HCHO oxidation mechanism of the Co-N-C (F) catalysts was investigated using in situ diffuse reflectance infrared spectroscopy ( in situ DRIFTS), and the reaction was found to follow the sequence HCHO → HCOO − → CO 2 + H 2 O, with formate degradation as a rate-limiting step.
研究领域:
催化材料
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 8
·e202200075
·
IF 9.14
Jun Zheng,Chenyang Zhan,Kai Zhang,Wenwu Fu,Qiaojun Nie,Ming Zhang,Zhongrong Shen
Graphical Cellmates : A zinc-ion battery cell is constructed with V 2 O 3 @C as the cathode and a “water-in-salt” electrolyte. Electrochemically induced oxidation of V 2 O 3 @C into amorphous V 2 O 5 with in situ Zn 2+ and H 2 O co-insertion leads to excellent cycling and rate performances. Systematic improvement of this architecture indicates significant promise for practical application. Aqueous Zn-ion batteries (ZIBs), with the advantages of low cost, high safety, and high capacity, have great potential for application in grid energy storage and wearable flexible devices. However, their commercial application is still restricted by their inferior long-term cycling stability, Zn dendrite formation, and the decomposition of aqueous electrolyte. In this study, a Zn|Zn(CF 3 SO 3 ) 2 +LiTFSI|V 2 O 3 @C cell is constructed to address the above issues. The V 2 O 3 @C electrode can be fully oxidized into amorphous V 2 O 5 @C simultaneously with Zn 2+ and H 2 O co-insertion. The cell delivers a high specific capacity of more than 240 mAh g −1 at 3 A g −1 , with extraordinary coulombic efficiency and capacity retention. The excellent electrochemical performances are attributed to synergistic effects between the V 2 O 3 @C electrode and the water-in-salt electrolyte with enhanced stability and improved interface reaction kinetics. Systematic improvements of this architecture indicate much promise for application.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yehui Guan,Mingjun Dai,Tong Liu,Yingwei Liu,Fangmeng Liu,Xishuang Liang,Hui Suo,Peng Sun,Geyu Lu
A fuel-cell-type gas sensor based on the membrane electrode assemble (MEA) composed of proton exchange membrane (Nafion) and Pt/C sensing electrodes was fabricated for detection of CO at room temperature . The Pt/C electrodes materials were synthesized from Vulcan XC-72 carbon powders and hexachloroplatinic acid (H 2 PtCl 6 ). This paper mainly focused on the effect of various dispersants (ethylene glycol (EG) tetraethyl orthosilicate (TEOS), glycerol and EG/polytetrafluoro-ethylene (PTFE)) on the performance of the presented sensor. Results revealed that the sensor utilizing EG as the dispersant elicited the highest response current toward 50 ppm CO. The current of the sensor was linearly correlated with CO concentration in the range of 1–200 ppm, which sensitivity was 88 nA/ppm. In addition, the 90% response and recovery times of the sensor toward 50 ppm CO were 22 and 24 s, respectively. Besides, the prepared CO sensor also had a good repeatability and acceptable selectivity.
研究领域:
材料科学
·
传感器技术
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·5031-5039
·
IF 9.5
Li Wenxiang,Gao Shuo,Yang Chuanruo,Yang Juntao,Nisar Amjad,Xiang Guolei,Jin Junsu
In 2 O 3 is an effective electrocatalyst to convert CO 2 to formic acid (HCOOH), but its inherent poor electrical conductivity limits the efficient charge transfer during the reaction. Additionally, the tendency of In 2 O 3 particles to agglomerate during synthesis further limits the exposure of active sites. Here we address these issues by leveraging the template effect of graphene oxide and employing InBDC as a self-sacrificing template for the pyrolysis synthesis of In 2 O 3 @C. The resulting In 2 O 3 @C/rGO-600 material features In 2 O 3 @C nanocubes uniformly anchored on a support of reduced graphene oxide (rGO), significantly enhancing the active sites exposure. The conductive rGO network facilitates charge transfer during electrocatalysis, and the presence of oxygen vacancies generated during pyrolysis, combined with the strong electron-donating ability of rGO, enhances the adsorption and activation of CO 2 . In performance evaluation, In 2 O 3 @C/rGO-600 exhibits a remarkable HCOOH Faradaic efficiency exceeding 94.0% over a broad potential window of −0.7 to −1.0 V (vs. reversible hydrogen electrode (RHE)), with the highest value of 97.9% at −0.9 V (vs. RHE) in a H-cell. Moreover, the material demonstrates an excellent cathodic energy efficiency of 71.6% at −0.7 V (vs. RHE). The study underscores the efficacy of uniformly anchoring metal oxide nanoparticles onto rGO for enhancing the electrocatalytic CO 2 reduction performance of materials.
研究领域:
电化学
·
纳米材料
·
催化
·
能量转换
·
环境科学
✓ 已验证
DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 17
·期 5
·3010-3017
·
IF 8.02
Yao-Bing Huang,Long Yan,Meng-Yuan Chen,Qing-Xiang Guo,Yao Fu
Direct hydrogenolysis of the aromatic Csp2–O bonds in both phenols and phenyl ethers to form arenes selectively is a core enabling technology that can expand greatly the scope of chemical manufacture from biomass. However, conventional hydrogenolysis of phenols typically led to aromatic ring saturation instead of the cleavage of the Csp2–O bonds. Herein, we report a recyclable Ru–WOx bifunctional catalyst that showed high catalytic activities for the hydrogenolysis of a wide range of phenols and phenyl ethers, including dimeric lignin model compounds and the primitive phenols separated from pyrolysis lignin, to form arenes selectively in water. Preliminary mechanistic studies supported that the reactions occurred via a direct cleavage of the Csp2–O bonds and the concerted effects of the hydrogenating Ru sites and the Lewis acidic W sites are the key to such an unusual reactivity.
研究领域:
催化化学
·
可再生资源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PARENTERAL AND ENTERAL NUTRITION
·
2021
·Vol. 46
·期 6
·1353-1360
·
IF 4.016
Kaiming He,Chun Cao,Xiangrong Xu,Zhenyu Ye,Xiaoming Ma,Wei Chen,Peng Du
Background Acute liver injury (ALI) is an essential component of sepsis associated with poor outcomes. Octanoic acid (OA), a medium-chain fatty acid, has a protective effect on sepsis-induced organ damage, and autophagy is an adaptive response to sepsis. However, the underlying mechanism by which OA prevents ALI remains unknown. Therefore, we investigated whether OA-rich enteral nutrition (EN) prevented lipopolysaccharide (LPS)-induced ALI through the c-Jun N-terminal kinase (JNK)-dependent autophagy. Methods Firstly, Sprague Dawley rats were randomly divided into four groups (sham, LPS, LPS + EN, and LPS + EN + OA) to detect the effect of OA-rich EN on LPS-induced ALI. Then, rats were randomly divided into five groups (sham, LPS, LPS + EN + OA, LPS + EN + OA + anisomycin (AN), and LPS + SP600125) to explore the mechanism by which OA-rich EN prevented ALI. EN and OA-rich EN were conducted through gastric tubes for 3 days. The liver protective effects were measured by liver histopathological changes, enzymes, inflammatory cytokines of serum and liver, the levels of autophagy, and JNK activity. Results OA-rich EN inhibited JNK activity, up-regulated autophagy and prevented LPS-induced ALI. Inhibition of JNK activity conferred by SP promoted autophagy and prevented LPS-induced ALI. Moreover, the protective effect of autophagy and inhibition of JNK activity conferred by OA-rich EN on ALI was counteracted by AN. Conclusion OA-rich EN prevented LPS-induced ALI through JNK-dependent autophagy. This result suggested that OA-rich EN may be a therapeutic potential for ALI in patients with sepsis.
研究领域:
肝病学
·
免疫学
·
营养学
·
分子生物学
✓ 已验证
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 2
·305-316
·
IF 2.232
Wang Hao-yang,Cheng Xue,Li Xiao-feng,Pan Ji-min,Hu Jun-hua
To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials (LiNi 0.8 Co 0.15 Al 0.05 O 2 , NCA), lithium lanthanum titanate (LLTO) nanofiber and carbon-coated LLTO fiber (LLTO@C) materials were introduced to polyvinylidene difluoride in a cathode. The enhancement of the conductivity was indicated by the suppressed impedance and polarization. At 1 and 5 C, the cathodes with coupling conductive paths had a more stable cycling performance. The coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 C. In the pristine cathode, the propagation of lattice damaged regions, which consist of high-density edge-dislocation walls, destroyed the bulk integrity of NCA. In addition, the formation of a rock-salt phase on the surface of NCA caused a capacity loss. In contrast, in the LLTO@C modified cathode, although the formation of dislocation-driven atomic lattice broken regions and cation mixing occurred, they were limited to a scale of several atoms, which retarded the generation of the rock-salt phase and resulted in a pre-eminent capacity retention. Only NiO phase “pitting” occurred. A mechanism based on the synergistic transport of Li ions and electrons was proposed.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）