MATERIALS & DESIGN
·
2019
·
IF 5.77
Yuxuan Wang,Jie Sheng,Lidong Wang,Yu Zhao,Miao Wang,Ziyue Yang,Han Xue,Weidong Fei
Ferroelectric ceramic with negative thermal expansion during the phase transformation from T-phase to C-phase can be used as reinforcement to obtain low thermal expansion metal matrix composites. Interface bonding plays an important role in determining thermal and mechanical properties of the composites. Here, we designed and applied Cu 2 O coating on the surface of Sr 0.2 Ba 0.8 TiO 3 (SBT) particles by heterogeneous precipitation method, and subsequently obtained low thermal expansion Cu 2 O/SBT/Cu composites with excellent mechanical properties. It was found that the semi-coherent relationship can be formed in both Cu/Cu 2 O and Cu 2 O/SBT interfaces, which benefits the reduction of composites thermal expansion. The relationship among Cu 2 O content, SBT phase transformation and thermal expansion has been discussed. Compared with SBT/Cu composite, the average coefficient of thermal expansion of 6%Cu 2 O/SBT/Cu composite can be reduced from 12.97 × 10 −6 °C −1 to 11.44 × 10 −6 °C −1 . Moreover, with the introduction of Cu 2 O coating, the compressive strength of the composite can reach up to 722.7 MPa. This work provides a promising method to improve the thermal expansion and mechanical property of ferroelectric reinforcement metal matrix composites.
研究领域:
材料科学
·
复合材料
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 27
·6006-6016
·
IF 4.857
Shien Pei,Jianfeng Guo,Zhishun He,Liang-ai Huang,Tongzhou Lu,Junjie Gong,Haibo Shao,Jianming Wang
Graphical Sharing a shell : Porous Si-Cu 3 Si-Cu microsphere@C core–shell composites fabricated by an etching/electroless deposition and subsequent carbon coating show excellent lithium storage performance. Low-cost Si-based anode materials with excellent electrochemical lithium storage present attractive prospects for lithium-ion batteries (LIBs). Herein, porous Si-Cu 3 Si-Cu microsphere@C composites are designed and prepared by means of an etching/electroless deposition and subsequent carbon coating. The composites show a core–shell structure, with a porous Si/Cu microsphere core surrounded by the N-doped carbon shell. The Cu and Cu 3 Si nanoparticles are embedded inside porous silicon microspheres, forming the porous Si/Cu microsphere core. The microstructure and lithium storage performance of porous Si-Cu 3 Si-Cu microsphere@C composites can be effectively tuned by changing electroless deposition time. The Si-Cu 3 Si-Cu microsphere@C composite prepared with 12 min electroless deposition delivers a reversible capacity of 627 mAh g −1 after 200 cycles at 2 A g −1 , showing an enhanced lithium storage ability. The superior lithium storage performance of the Si-Cu 3 Si-Cu microsphere@C composite can be ascribed to the improved electronic conductivity, enhanced mechanical stability, and better buffering against the large volume change in the repeated lithiation/delithiation processes.
研究领域:
材料科学
·
能源存储
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DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Xiaoting Deng,Min Lao,Zhenqin Li,Shaofeng Yin,Feng Liu,Zhiyong Xie,Yili Liang
A flexible carbon nanofiber film with high conductivity was prepared by electrospinning, and then Cu was uniformly deposited on the fiber film by pulse electrodeposition to prepare Cu nanocrystal/carbon nanofiber film. Cu@PtCu/carbon nanofiber (Cu@PtCu/CNF) catalytic films were synthesized by in-situ substitution reduction. The Cu@PtCu/CNF catalytic film solves the problem of uneven activity of the catalytic layer and can be directly used as the catalytic layer. The morphology and structure were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Electrochemical test results show that the Cu@PtCu/CNF catalytic films obtained at the chloroplatinic acid concentration of 0.5 mg·mL–1 (N2) exhibited 2.5 times specific activity when compared with commercial Pt/C catalysts. After 5000 cycles of stability test, the electrochemical surface areas (ECSAs) were still maintained at 80%, and the half-wave potential decreased by 11 mV, which was better than those of commercial Pt/C catalysts.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Dengji Zhu,Xinmeng Wu,Haiwei Han,Yiming Zhang,Jiawei Wu,Yi Ding,Lihua Yu,Junhua Xu,Bin Zuo
The investigation of friction response behavior and underlying mechanisms of modified implants in a simulated human tissue fluid environment is critical for assessing their in vivo service life. This study presents an in vitro evaluation of implant coatings through integrated experimental and simulation approaches. A series of ZrBN-Cu composite films were fabricated using non-equilibrium magnetron sputtering, and the composition, microstructure, mechanical properties, chemical stability, and tribological behavior in bovine serum albumin (BSA) solution were systematically characterized. The results reveal that the ZrBN-Cu films comprise fcc-ZrN, hcp-ZrB 2 , and fcc-Cu. With increasing Cu content, the hardness and elastic modulus initially increase and subsequently decrease, reaching peak values of 25.45 GPa and 274.99 GPa, respectively, at a Cu concentration of 1.1 at.%. Moreover, the ZrBN-Cu film with 1.1 at.% Cu demonstrates optimal electrochemical stability, exhibiting a corrosion current density of 1.6×10 -6 A/cm 2 and a corrosion potential of -0.04 V, indicative of superior chemical resistance. In BSA solution, the coefficient of friction gradually decreases and stabilizes at 0.11. The wear rate initially declines and then slightly increases with Cu content, reaching a minimum value of 2.1×10 -8 mm 3 N -1 m -1 at 1.1 at.% Cu. The lubrication and wear mechanisms of the ZrBN-Cu/BSA system were analyzed from lubrication state, adsorption behavior, and tribochemical reactions. The findings suggest that: (1)The ZrBN-Cu/BSA system operates under boundary lubrication conditions. (2)Cu incorporation facilitates the formation of a stable physical and chemical adsorption layer on the surface, while B enhances the structural integrity of this layer. (3)Cu exerts a catalytic effect, promoting the degradation of BSA molecules during friction and resulting in the formation of high-molecular-weight carbon-based compounds with lubricating properties.
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产品关联
DOI
高影响因子
Journal of Chemistry
·
2020
·Vol. 2020
·期 1
·5496712
·
IF 1.79
Yingying Zhao,Linchuan Zhan,Zhongjun Xue,Kianpoor Kalkhajeh Yusef,Hongxiang Hu,Mengjun Wu
Natural macromolecule adsorbing materials are alternatives for remediation of heavy metals’ polluted waters. In this study, sodium alginate composite gel (SACL) was synthesized from sodium alginate (SA), polyethylene glycol oxide (PEO), and nanomaterials to remove wastewater Cu (II) and Cd (II). The adsorption efficiency of SACL was analysed in relation to the contact time, initial concentrations of metal ions, temperature, adsorbent dosage, and solution pH. Three models, i.e., kinetic model, isothermal adsorption model, and thermodynamic model, were used to fit the experimental data. Our results showed that the highest removal rates of Cu (II) and Cd (II) from wastewater were 96.8% and 78%, respectively, under the condition of the best liquid-solid ratio of 12.5 ml·g −1 , and the contact time of 180 min (25°C). Overall, the SACL adsorption of Cu (II) and Cd (II) was spontaneous. The adsorption kinetics and the isothermal adsorption were fitted well with the pseudo-second-order kinetic equation and Langmuir equation, respectively. Combined with SEM-EDS and FTIR analysis, results suggested that SACL adsorbs wastewater Cu (II) and Cd (II) mainly through chemical reaction on its surface area. Altogether, this work concludes on SACL as an efficient and ecofriendly adsorbent for wastewater Cu (II) and Cd (II).
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Science Bulletin
·
2020
·
IF 9.511
Linbao Guo,Jiangjian Shi,Qing Yu,Biwen Duan,Xiao Xu,Jiazheng Zhou,Jionghua Wu,Yusheng Li,Dongmei Li,Huijue Wu,Yanhong Luo,Qingbo Meng
Aqueous precursors provide an alluring approach for low-cost and environmentally friendly production of earth-abundant Cu 2 ZnSn(S, Se) 4 (CZTSSe) solar cells. The key is to find an appropriate molecular agent to prepare a stable solution and optimize the coordination structure to facilitate the subsequent crystallization process . Herein, we introduce thioglycolic acid (TGA), which possesses strong coordination (SH) and hydrophilic (COOH) groups, as the agent and use deprotonation to regulate the coordination competition within the aqueous solution. Ultimately, metal cations are adequately coordinated with thiolate anions , and carboxylate anions are released to become hydrated to form an ultrastable aqueous solution. These factors have contributed to achieving CZTSSe solar cells with an efficiency as high as 12.3% (a certified efficiency of 12.0%) and providing an extremely wide time window for precursor storage and usage. This work represents significant progress in the non-toxic solution fabrication of CZTSSe solar cells and holds great potential for the development of CZTSSe and other metal sulfide solar cells.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Journal of Materials Chemistry A
·
2026
·
IF 9.5
Junzhou Men,Zeyu Wang,Chen Luo,Ai Zhang,Hui Xian,Tao Jiang,Yating Wang
To address the urgent demand for efficient solar-to-hydrogen conversion, a novel Cu-doped 3D ordered macroporous (3DOM) ZIF-8 photocatalyst was fabricated via polystyrene sphere templating coupled with a dual-solvent method. Systematic characterization confirmed the preservation of the ZIF-8 crystalline structure after ∼2 at% Cu2+ incorporation. The 3DOM framework amplified light absorption via slow-light effects, while Cu2+ doping narrowed the band gap and further intensified the slow-light phenomenon. The optimized Cu-3D-ZIF-325 exhibited a photocatalytic hydrogen evolution rate of 2233.2 µmol g−1 h−1, which is 29 times higher than that of pristine ZIF-8. This performance enhancement originated from synergistic mechanisms: EIS measurements revealed that Cu2+ sites improved charge separation, and the optimized band structure facilitated carrier transport; DFT calculations further verified that Cu2+ optimized the adsorption/dissociation of water and elevated the conduction band potential, strengthening the reductive driving force for H2 production. This work establishes a viable dual-modification strategy for high-efficiency MOF-based photocatalysts.
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 6
·2137-2143
·
IF 6.4
Jingshan Hou,Jianghua Wu,Zhiyu Qin,Yongzheng Fang,Leijun Shen,Xin Qiao,Langping Dong,Ganghua Zhang,Yufeng Liu,Guoying Zhao,Haijie Chen
Low-dimensional metal halides have attracted extensive attention because of their superior optoelectronic properties, high stability and structural diversity. In this work, we report a two-dimensional (2D) lead-free halide Cs2MnCl4:Cu+ as a new phosphor for white light-emitting diodes (LEDs). By doping copper(I) into manganese(II) sites, a strong green emission with a photoluminescence quantum yield (PLQY) of 70% was observed. The luminescence center was located at 530 nm and the optimal excitation wavelength was determined to be 310 nm, which suggests a large Stokes shift of 220 nm. Steady-state and transient fluorescence spectra show a decay time of 114.19 μs, indicating a self-trapped exciton (STE) emission mechanism which was further confirmed by temperature-dependent steady-state photoluminescence spectroscopy. This work suggests that manganese halides could be considered as a new family with high luminescence efficiency for optoelectronic applications.
研究领域:
材料科学
·
光电子学
·
发光材料
·
固态物理
·
半导体器件
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9
Jiangyuan Qiu,Ruxin Liu,Tao Yu,Wenxuan Li,Lingyuan Wu,Weiming Zhong,Ting Wan,Rui Guo,Zaiyin Huang,Xuanwen Liu
This study addresses the technical challenges of traditional processes for precious metal recovery from electronic waste, including high energy consumption, severe pollution, and the use of highly corrosive reagents. We innovatively propose a green recovery strategy based on piezoelectric catalysis. By combining the compositional characteristics of electronic waste (Cu > 80 wt%, Au 0.1–0.5 wt%) with the hard-soft acid-base (HSAB) theory, we developed a BOC-NH₄Cl-CH₃CN-H₂O catalytic system. This system achieves efficient dissolution of copper and gold (1334 mg h −1 ·g-cat −1 and 2.7 mg h −1 ·g-cat −1 , respectively) through an oxidation-coordination mechanism, with dissolution rates reaching 99.8% and 95.5% in simulated systems and enrichment purity exceeding 99%. Based on the experimental data, it is proposed that under piezocatalysis, acetonitrile is oxidized to acetamide, which then synergistically coordinates with NH₃/Cl − to form stable coordination products (with binding energies of E_Cu = −4.034 eV and E_Au = −2.993 eV, respectively). This process may serve as a key mechanism responsible for the significant enhancement of metal dissolution. Due to the lower oxidation potential of Cu ( E° = 0.34 V) compared to Au ( E° = 1.5 V), the system exhibits a “high‑copper, low-gold” selective dissolution characteristic that aligns well with waste composition. This technology provides an efficient and environmentally friendly solution for metal recovery from electronic waste.
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2024
·
IF 6.2
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Yi Sun,Qiang Shen
The microstructural design offers an effective strategy for overcoming the strength-ductility trade-off in Al-based composites. In this study, we demonstrate concurrent improvements in strength and ductility of Al-Cu composites by introducing heterogeneous structures, including low-angle grain boundaries (LAGBs), stacking faults (SFs), and nano-CuAl₂. A high density of LAGBs refines Al grains by absorbing dislocation into high-angle grain boundaries (HAGBs) during deformation, which helps to suppress crack propagation under plastic deformation. The absorption of dislocations by LAGBs prevents dislocation pile-up at grain boundaries, thereby reducing stress concentration. The stacking fault network formed at the heterogeneous interface between Al and CuAl₂ effectively reduces the mean free path of dislocation motion, overcoming the Hall-Petch limit in microcrystalline grains. Nano-particles further contribute to Orowan strengthening by hindering dislocation motion. The synergistic effect of these heterogeneous structures successfully evades the strength-ductility trade-off in Al-Cu composites, providing an efficient strategy by multiscale defects to facilitate maintaining plasticity in metal-matrix composites. Employing multiscale defects provides an efficient strategy to maintain plasticity in metal-matrix composites.
研究领域:
材料科学
·
金属基复合材料
·
材料力学性能
·
微观结构设计
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Yongjun Sun,Aowen Chen,Wenquan Sun,Kinjal J. Shah,Huaili Zheng,Chengyu Zhu
In this work, carboxylated chitosan and acrylamide are used to synthesize a graft-modified natural polymer flocculant carboxylated chitosan-graft-acrylamide (CCSPAM) by UV-induced polymerization for copper and chromium removal. The effects of total monomer concentration, monomer mass ratio, pH value, photoinitiator concentration, and illumination time on the synthesis performance of CCSPAM were investigated regarding intrinsic viscosity (IV), grafting rate (GR), and grafting efficiency (GE). Various analytical techniques characterize the physicochemical characteristics of CCSPAM. Single factor experiments are used to investigate the effect of dosage, pH value, and reaction time on the chelation and capture of heavy metal ions by CCSPAM. The results show that the optimal IV, GR, and GE of CCSPAM achieved at total monomer concentration 30%, monomer mass ratio 1:4, pH 7.0, photoinitiator concentration 0.03%, and irradiation time 2 h are 1412.2 mL/g, 394.1%, and 84.1%, respectively. The experimental data of flocculation show that CCSPAM has a good total Cu and total Cr removal efficiency of 74.8% and 70.6% at dosage 2.0 mg/L, pH 6.0, and reaction time 2h, respectively. Fom the investigation, it is concluded that the grafted chitosan (CCSPAM) could be a be an effective and eco-friendly flocculant for removal of total Cu and total Cr ions from aqueous system.
研究领域:
环境化学
·
高分子科学
·
水处理
·
重金属修复
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DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2013
·
IF 0.917
Hui LI,De-li XIAO,Hua HE,Rui LIN,Peng-li ZUO
Amino-functionalized magnetic nanoparticle (NH 2 -MNP) were prepared by a sol-gel approach. The adsorption behavior of Cu(II) ions on NH 2 -MNP was discussed systematically by batch experiments. The effects of initial Cu(II) ions concentration, time, pH and temperature were investigated. In kinetic studies, the pseudo-second-order model was successfully employed, and the pseudo-first-order model substantiated that Cu(II) adsorption on NH 2 -MNP was a diffusion-based process. Langmuir model and Dubinin-Radushkevich model ( R 2 >0.99) were more corresponded with the adsorption isotherm data of Cu(II) ions than Freundlich model. The adsorption capacity was increased with the increment of temperature and pH. NH 2 -MNP remains excellent Cu(II) recoveries after reusing five adsorption and desorption cycles, making NH 2 -MNP a promising candidate for repetitively removing heavy metal ions from environmental water samples. According to the results obtained from adsorption activation energy and thermodynamic studies, it can be inferred that the main adsorption mechanism between absorbent and Cu(II) ions is ion exchange-surface complexation.
研究领域:
环境化学
·
纳米材料
·
重金属去除
·
吸附科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）