MATERIALS CHEMISTRY AND PHYSICS
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2025
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IF 4.7
Ruofan Wang,Yanfu Yan,Wenjun Li,Zhiming Li
Cu–Al soft soldering plays a crucial role in the fabrication of Cu–Al composites. In this study, a new rosin-type flux for Cu–Al direct soldering was synthesized, and G-1 (Sn42Bi58 paste) and G-2 (Sn64.7Bi35Ag0.3 paste) soft soldering pastes were prepared. The results of flux physicochemical tests are as follows: density 1.11 g/cm 3 , pH 5.2, viscosity 32 Pa s, and non-corrosive to the copper plate. These are in line with the requirements for soldering applications. The wettability test results show that G-1 and G-2 displayed good wettability on the Cu and Al plates. This is in line with the standard Cu–Al soft soldering paste. The mechanical property test showed that G-2 had better mechanical properties than G-1, with a tensile strength of 112.57 MPa. SEM revealed that the IMC (intermetallic compound) layer of G-1 was flatter than that of G-2. This is closely related to the fact that the Ag in Sn64.7Bi35Ag0.3 powders can reduce the enrichment of metallic Bi and refine the grains.
研究领域:
材料科学
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焊接工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2024
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IF 20.2
Bo Liu,Miao Cheng,Chunyang Zhang,Yitao Si,Jiancheng Zhou,Yuqi Ren,Jie Guan,Lunbo Duan,Maochang Liu,Dengwei Jing,Naixu Li
CO 2 photoreduction into high-value-added C 2+ products struggles with energetic challenges in forming critical intermediates and multiple C−C bonds. Herein, an effectively synthesized photocatalyst , Bi 2 WO 6 nanosheets with oxygen vacancies anchoring Au and Cu dual single atoms on the surface, can convert CO 2 and H 2 O vapour into C 3 H 6 and C 2 H 4 . The high product selectivity of 18.2 % for C 3 H 6 and 65.4 % for total C 2+ hydrocarbons are achieved under concentrated light irradiation (2.4 W·cm −2 ). Au-Cu dual-single-atom sites and defect engineering strategies exhibit synergistic effects on optimizing the reaction thermodynamics and charge kinetics for CO 2 conversion. Theoretical calculations provide reference values for reaction pathways of C 3 H 6 and C 2 H 4 formation, with the C−C couplings being potential determining steps of multicarbon product formation. Our work offers a promising strategy with a combination of concentrated light irradiation technology and catalyst modification to achieve high selectivity of C 2+ products.
研究领域:
材料科学
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催化化学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
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2019
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IF 2.233
Manlin Li,Weiqiu Huang,Bo Tang,Fujiao Song,Aihua Lv,Xiang Ling
The Cu-BTC, a widely studied metal-organic framework (MOF), has been applied in various fields such as gas adsorption, separation, storage, and catalysis. However, the Cu-BTC collapses due to the replacement of the organic linker by water molecules under humid conditions, which limits its practical application in industries. In consideration of the undesirable water effect on the framework stability of Cu-BTC, a stable activated carbon (AC) was incorporated into it by the in situ method to yield a composite material AC/Cu-BTC with high water stability. XRD and SEM patterns proved that the AC7%/Cu-BTC successfully retains its crystal structure after being exposed to water molecules. The adsorption amount of n-hexane vapor of the AC7%/Cu-BTC after water vapor adsorption-thermal desorption is 307% of that of the Cu-BTC. The addition of the AC changes the adsorption active sites and reduces the strong affinity of the Cu-BTC to water molecules, resulting in the AC7%/Cu-BTC having a much lower adsorption rate for water vapor than the Cu-BTC. Therefore, the AC7%/Cu-BTC can be protected from a large amount of water molecules and avoid structural collapse caused by the disconnection between the copper center and the organic linker. The composite displays a potential value for stable applications of MOF-based materials under ambient conditions.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Ziyi Li,Jia Xiong,Yufei Huang,Yangqiang Huang,Geoffrey I.N. Waterhouse,Ziyun Wang,Yu Mao,Zhiwu Liang,Xiao Luo
Photocatalytic CO 2 reduction reaction (CO 2 RR) is usually constrained by sluggish kinetics and low product selectivity. Herein, a Cu-doping multi-tier hierarchical S-scheme heterostructure Cu-ZnIn 2 S 4 /ZIF-67 was fabricated, achieving highly efficient photocatalytic CO 2 RR under visible light without additional thermal input. At low pressure (absolute pressure 40 kPa), the optimized catalyst 2Cu-ZISF demonstrated a CH 4 yield of 22.27 μmol g −1 h −1 with a selectivity of 94.7 %. In situ XPS and EPR confirmed that the photogenerated charge transfer obeys an S-scheme mechanism, with Cu sites serving as electron-rich centers, facilitating spatial charge separation. In situ DRIFT detected reaction intermediates of photocatalytic CO 2 RR mechanism, and Gibbs free energy calculations via Density Functional Theory revealed that Cu incorporation significantly stabilizes surface CO* species, thus reducing CO(g) production and facilitating hydrogenation, thereby acting as targeted active sites for CH 4 production. This work overcomes the limitations of slow reaction kinetics and offers an in-depth understanding of how to design effective S-scheme heterojunction photocatalysts and their charge transfer mechanisms.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yu Fan,Bowen Lu,Ziqiang Han,Cong Luo,Liqi Zhang
CeO 2 support inhibits CaO sintering, and oxygen vacancy influences CO 2 hydrogenation performance, making CeO 2 widely applied in Integrated CO 2 capture and in-situ conversion technology for reverse water–gas shift (ICCC-RWGS). Oxygen vacancy concentration was dependent on the morphology of CeO 2 , which would affect metal dispersion and CO 2 hydrogenation conversion. However, Very little is known about the morphology effect of CeO 2 on the carbon capture and in-situ hydrogenation performance of DFMs. Here, Cu/CeO 2 with different CeO 2 morphologies was synthesized, and high Cu dispersion was achieved on Cu/CeO 2 -R, exhibiting the best CO 2 hydrogenation performance. Integrated Cu/CeO 2 with CaO by physical mixing method, CaO-Cu/CeO 2 was used to investigate the morphology effects of CeO 2 on the performance of CaO-Cu/CeO 2 for integrated CO 2 capture and conversion to CO. CaO-Cu/CeO 2 -R exhibited the best capture-hydrogenation performance (CO 2 conversion rate of 75 %, CO production rate of 9.72 mmol/g). The CeO 2 -R provided more surface oxygen vacancies, enhancing carbonate hydrogenation. The larger specific surface area and {1 1 0} crystal plane of CeO 2 -rod enhanced Cu dispersion, and the smaller particle size of CeO 2 -R enhanced its interaction with CaO, improving the cyclic stability of CaO-Cu/CeO 2 -R. The hydrogenation performance of CaO-Cu/CeO 2 was dependent on the morphology of CeO 2 , providing insights into the design of high-activity metal catalytic components in ICCC-RWGS.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
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IF 9.642
Yue Han,Chao Liu,Xiangchen Kong,Xing Wang,Yuyang Fan,Ming Lei,Ming Li,Rui Xiao,Longlong Ma
In this study, two counterexamples of lignin preoxidation-hydroconversion were reported. First, two lignin feedstocks were preoxidized with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) in acetonitrile with various dosages (15%, 30%, and 60%). Then, these preoxidized lignins (HELOs and MWLOs) were hydroconverted in supercritical ethanol catalyzed by Cu/CuMgAlO x . Total yields from HELOs were all higher than those from HEL , indicating the good promotion of DDQ preoxidation on the subsequent hydroconversion of HELOs, especially with the DDQ dosage of 15%. Differently, the promotion effect of DDQ preoxidation on the hydroconversion of MWLOs depended on the DDQ dosage as well as the reaction time. Through the comparison of two counterexamples, this work bursted the myth that preoxidation can always promote the subsequent hydroconversion of lignin, revealed the influence of lignin property, preoxidation degree, and reaction conditions on the subsequent hydroconversion of preoxidized lignin, and presented the new insight into the preoxidation-hydroconversion strategy for lignin.
研究领域:
化学工程
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催化
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木质素化学
✓ 已验证
DOI
PubMed
高影响因子
Catalysis Science & Technology
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2024
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IF 4.4
Kai Cui,Jiaming Yang,Yuli Jing,Junwen Chen,Chen Zhao,Peng Wu,Xiaohong Li
Sustainability issues have led to a gradual market expansion for the 1,4-butanediol (BDO) monomer of the biodegradable plastics to replace conventional plastics. Maleic anhydride (MA) can be derived from the oxidation of bio-based furfural or fructose. Although the hydrogenation of MA can produce a series of products, including succinic anhydride (SA), γ-butyrolactone (GBL), BDO and tetrahydrofuran (THF), the one-pot deep hydrogenation of MA to BDO or THF under mild conditions has been rarely reported in the literature until now. Herein, we report the production of BDO from the one-pot deep hydrogenation of MA over a Cu–0.03Mo/SiO2 catalyst, achieving 100% MA conversion and 88.3% BDO yield. The Cu–0.03Mo/SiO2 catalyst also showed good long-term stability without obvious loss in activity or BDO selectivity during a 160 h time-on-stream test. Doping Mo to Cu/SiO2 catalysts in an optimal amount adjusted the distribution of Cu0/Cu+ species and modulated the interaction of Cu–SiO2 and surface acidity, so that the activation of hydrogen, MA and relevant intermediates can become balanced, in addition to the restriction of side-reactions. This study provides potential for the green synthesis of BDO with non-precious Cu-based catalysts.
研究领域:
化学工程
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可持续发展
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催化科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Mingming Luo,Fang Li,Panpan Dong,Yijun Tan,Ruowei Liu,Longping Xu,Pei Zhao,Zijian Wu
Kanamycin (KANA), a widely used antibiotic associated with foodborne disease, requires accurate monitoring solutions. This study presents a novel ultrasensitive electrochemical aptasensor for KANA quantification using a signal amplification method. The sensing platform was constructed with Cu/Al-MOF@Ti 3 C 2 nanocomposites as the support and incorporated aptamers specifically recognizing KANA. Among them, Cu/Al-MOF provided a high specific surface area for anchoring a large number of aptamers, Ti 3 C 2 was used to enhance the conductivity of the aptasensor, the aptamers have been used for the improvement of the sensitivity of the aptasensor, and the insertion of Cu/Al-MOF into Ti 3 C 2 sheets effectively prevents stacking between Ti 3 C 2 sheets. In the context of KANA, the specific recognition of the aptamer led to a decrease in the electrochemical signal. Under optimal conditions, the logarithm of the electrochemical output signal versus KANA concentration was linear over the range of 10 fM to 100 nM with a limit of detection (LOD) of 0.74 fM. In addition, the aptasensor showed excellent accuracy and high reproducibility and has been successfully employed in actual samples, enabling the detection of a wide range of targets by simply replacing the matching aptamer.
研究领域:
食品安全
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生物传感
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
·
IF 5.8
Wenpeng Hong,Yuhang Li,Haifeng Jiang,Yu Zhang,Wei Jia,Meng Song
Catalytic steam gasification is a promising route for converting plastic waste into valuable gaseous products. This work explores the heterogeneous catalytic gasification behavior of polystyrene (PS) in a two-stage fixed bed system, as well as the promotion mechanism for the generation of gaseous hydrocarbons. The obtained results indicate that adding MnCo 2 O 4 catalyst can effectively promote the formation of gaseous hydrocarbons. Further, the incorporation of Cu strengthens the above reaction process, resulting in a yield of 85.08 mmol/g for the C 1 -C 3 gaseous hydrocarbons. However, the doping of Ni has a negative effect on the generation of gaseous hydrocarbons. Moreover, an increase in the flow rate of steam within the system results in an initial rise followed by a decline in the yield of gaseous hydrocarbons. The optimal steam inflow is determined at 0.14 mL/min. The cycling test results of the catalyst show that the yield of the gaseous components of C 1 -C 3 can still be maintained at about 80 % of the initial state after five cycles. Finally, the synergistic pathway of steam and catalyst in PS gasification is elucidated. These works provide important and valuable guidance for the preparation of high-value gas-phase hydrocarbon products from waste plastics.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Xingtao Cheng,Kaijun Wei,Hongjie Li,Na Teng,Shijun Xu,Quangang Chen,Xianmin Gong,Yi He,Siming Yan
At the present time, the subject of seawater scouring and corrosion phenomena is attracting considerable attention. Accordingly, the present study involved the synthesis of CuPP materials and the preparation of Ni-Cu/CuPP coatings for deployment in marine environments characterised by elevated stress and corrosion. The results show that CuPP can effectively enhance the wear resistance and long-term corrosion resistance of Ni-Cu coatings, which is attributed to ‘fine grain strengthening’ and ‘diffusion strengthening’. Furthermore, the formation of a friction transfer film and the transformation of the wear mechanism are the primary factors contributing to the exceptional wear resistance of the Ni-Cu/CuPP composite coatings.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Han Jiang,Bin Guan,Xuesong Peng,Reggie Zhan,He Lin,Zhen Huang
This study focuses on investigating the influence of ion-exchange method (ION-F and ION-A) and one-pot method (ONE-F and ONE-A) on catalytic properties and hydrothermal stability of Cu/SSZ-13. It was found that ONE-F catalyst showed better SCR activity, especially at low temperature range below 400 °C. After hydrothermal aging, ION-A exhibited higher low temperature efficiency than ONE-A. The effect of synthesis method on the physicochemical structure, acidity intensity, and Cu species migration or transformation of the fresh and aged Cu/SSZ-13 catalysts were comprehensively characterized by NH 3 -TPO, H 2 -TPR, NH 3 -TPD, ICP, XRF, BET, XRD, SEM, and TEM. ONE-F has more isolated Cu 2+ sites, higher ratio of active sites Cu 2+ -2Z/[Cu(OH)] + -Z, more Lewis acid sites, and smaller particle size than ION-F. However, hydrothermal aging had severe effect on Cu/SSZ-13 prepared by one-pot method, leading to particle aggregation and decrease of active copper sites. According to NH 3 -SCR kinetic studies, smaller particle size and more uniformly distributed active sites over ONE-F resulted in less effect of pore diffusion limitation. Furthermore, in situ DRIFTS results indicated that more monodentate nitrates adsorbed sites and Lewis acid sites existed in ONE-F. On the other hand, monodentate nitrates were identified to be the most active nitrate species, and Lewis acid sites were ascertained to be more active than Brønsted acid sites. Therefore, ONE-F showed more excellent SCR performance than ION-F. However, hydrothermal aging resulted in loss of majority of nitrate adsorbed sites and acid sites over catalyst prepared by one-pot method, leading to lower SCR performance. In conclusion, Cu/SSZ-13 prepared by ion-exchange method has higher hydrothermal stability, however, fresh Cu/SSZ-13 prepared by one-pot method has excellent catalytic properties.
研究领域:
催化材料
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Wenyang Sheng,Li Yang,Yichen Yang,Chenzhi Wang,Guangyang Jiang,Yongqiang Tian
The existing films used for fruit preservation suffer from insufficient preservation abilities. This study introduces Cu-tannic acid (Cu-TA) nanoparticles, synthesized from tannic acid (TA) and Cu 2+ , to enhance food packaging properties. Integrated into a chitosan-gelatin (CG) matrix, the resultant Cu-TA nanocomposite films exhibit superior antibacterial efficacy and killing rates of Escherichia coli and Staphylococcus aureus more than 99 %, and double the shelf life of strawberries, underscoring the exceptional freshness preservation capabilities of film. Additionally, the tensile strength of the Cu-TA nanocomposite films increased by 1.75 times, the DPPH radical scavenging percentage increased from 29.4 % to 68.4 %, and the water vapor permeability (WVP) decreased by about 60 % compared to the pure CG films. Comprehensive cytotoxicity and migration assessments confirm the safety of film, paving the way for their application in food packaging. The excellent performance of the Cu-TA nanocomposite films positions them as a formidable solution for protecting perishable food items.
研究领域:
食品科学
·
材料科学
·
微生物学
✓ 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）