Nanoscale
·
2025
·
IF 5.1
Xiaoyan Zhang,Ruiqi Liu,Zhouyu Yu,Baisong Chang
Ag₂S nanoparticles exhibit tremendous application potential in biomedical fields such as photothermal therapy (PTT) and photoacoustic imaging. However, they have certain drawbacks, including relatively weak near-infrared (NIR) absorption capacity and rather limited photothermal conversion efficiency. In this study, we designed a NIR-II fluorescent probe that can be activated by tumor microenvironment (TME). Specifically, we first incorporated In3+ into Ag₂S nanoparticles, then allowed Cu2+ to complex with them, and finally encapsulated the resulting complexes with polyethylene glycol (PEG) (denoted as ACP). The incorporation of In3+ effectively mitigated the lattice defects of Ag₂S, significantly enhancing its NIR absorption capacity and thereby strengthening therapeutic effect of PTT. Under 808 nm photoexcitation, the reaction of ACP nanoparticles with H2O2 exhibited a photothermal conversion efficiency of up to 67.8%. The introduction of Cu²⁺ can react with the excessive H₂O₂ in tumor cells to generate highly oxidizing hydroxyl radicals (·OH), enabling efficient chemodynamic therapy (CDT). Moreover, this process also depleted glutathione (GSH) within tumor cells, further disrupting the antioxidant defense system of tumor cells and greatly enhancing therapeutic efficacy of CDT. This study offers a novel approach for utilizing responsive nanoparticles to enhance the dual synergistic in vitro effects of PTT/CDT.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Peibo Li,Guoqiang Luo,Xiaoshan Zhang,Xiao Wang,Zhihao Wu,Yi Sun,Qiang Shen
As one of the most commonly used binary alloys , the effect of intermetallic compounds (IMCs) of Al-Cu alloys in powder metallurgy on their structure and properties is instructive for tailoring Al-Cu alloys for different applications. In this investigation, a series of Al-Cu-Ag alloys with varying Cu compositions were fabricated via hot pressing. TEM analysis identified CuAl 2 as the primary intermetallic compounds , with Ag existing in forms including Ag 2 Al, elemental Ag, and an Ag-(Cu) solid solution . The modulation of Cu content influenced the state of Ag and the mechanical behaviors of the Al-Cu-Ag alloy. Particularly, the high Al/Cu alloy, benefiting from a synergistic effect comprising stacking faults, nanoscale precipitates, and solid solutions, exhibited outstanding mechanical properties. Conversely, the Al-50Cu-3Ag alloys displayed significant brittleness , attributed to the adverse impact of large-scale intermetallic compounds and increased grain size due to the formation of CuAl 2 . The incorporation of nanoparticles effectively mitigated the grain size in high Al/Cu alloys. This study elucidates the correlation between the evolution of intermetallic compounds and composition in Al-Cu alloys, offering novel insights into the reinforcement of both Al-based and Cu-based alloys.
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Desalination and Water Treatment
·
2024
·
IF 1
Fengli Shao,Shaoyu Zhou,Jiaxin Xu,Qiong Du,Jianqiu Chen,Jingge Shang
Nanoscale zero-valent iron (nZVI) has been proven to be more effective for the treatment of hexavalent chromium(Cr(VI)) when modified with the transition metal Cu. In this study, biochar-supported Cu/Fe bimetallic nanoparticles (Cu-nZVI/BC) were prepared and used for Cr(VI) removal from aqueous solution. The effects of the pH value, the initial concentration of Cr(VI), coexisting ions and humic acids (HA) were investigated. The compositional structures of Cu-nZVI/BC were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The maximum removal efficiency of Cr(VI) was 50.57% (126.41 ± 3.75 mg g –1 ) for Cu-nZVI/BC at pH 2. The adsorption kinetic data were in agreement with the pseudo-second- order model, which confirmed that the adsorption step was a chemical adsorption and reduction process. The presence of Ca 2+ and NO 3 – had an inhibitory effect on Cr(VI) removal, while dHA increased the removal efficiency at high concentrations. This study proves that Cu-nZVI/BC removal of solution Cr(VI) is feasible and shows significant potential in practical applications.
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CHEMOSPHERE
·
2022
·
IF 8.943
Cai Xiunan,Tian Ling,Chen Meifei,Liu Yijun,Wang Wei,Long Junhao,Zhang Yanjuan,Tao Gan,Hu Huayu,Huang Zuqiang
To effectively treat the hydrophobic organic contaminant and utilize an industrial solid waste manganese residue (MR), a novel starch-derived carbon (SC)-decorated and Cu-doped (Fe,Cu)S/CuFe 2 O 4 solid solution (CFS/CFO@SC) was prepared from MR via mechanical activation treatment of precursor materials followed by one-step pyrolysis and applied as a photo-Fenton catalyst to treat a hydrophobic organic compound, 17α-ethinylestradiol (EE2). Characterization results showed that the CFS/CFO@SC solid solution with unique crystal and electronic structures exhibited high adsorption capacity and catalytic activity , ascribed to that Cu doping and C decorating enhanced its hydrophobicity and BET surface area. The CFS/CFO@SC showed excellent degradation efficiency with nearly 100% of EE2 removal rate in 40 min (degradation rate constant of 0.112 min −1 ), and a high mineralization degree with 95.2% of TOC removal in 180 min. This could be ascribed to that C decorating and the formation of CFS/CFO solid solution promoted the charge transfer in a continuous band, resulting in effective separation of photogenerated holes–electrons (h + –e – ). The strong interaction of Fe–Cu collaborating with the photoelectron could effectively accelerate the recycle of Fe 3+ /Fe 2+ and Cu 2+ /Cu + , thus generating more active radicals. Moreover, CFS/CFO@SC showed promising stability and recyclability with the EE2 removal rates all >95% after five cycles. This work brings a valuable approach for the rational design of high-performance Fe-based photo-Fenton catalysts for environmental remediation and the valorization of MR.
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高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 23
·8094-8107
·
IF 5.721
Yonghai Feng,Congming Lu,Huijie Wang,Minjia Meng,Yunlei Zhang,Dewei Rao,Lei Liu,Hengbo Yin
The aerobic catalytic oxidation of 1,2-propanediol (PDO) over non-noble metal (e.g. Cu) based catalysts usually suffers serious C3 product dissociation at high temperature, thus showing low lactic acid (LA) selectivity. Here, an alternative anaerobic catalysis strategy over spinel copper–iron-oxide magnetic nanoparticles (CuFeOx MNs) with the coexistence of Cu(I) and Cu(II) dual sites is developed for the catalytic transformation of PDO to LA with a quantitative yield of co-product H2 in basic aqueous solution. The absence of O2 is beneficial for enhancing LA production in comparison with the presence of O2. The synergy between Cu(I) and Cu(II) sites in CuFeOx MNs is vital for improving the catalytic performance as compared to Cu2O or CuO catalysts with Cu(I) or Cu(II) sites alone. Cu1Fe1Ox MNs with a Cu/Fe mole ratio of 1/1 exhibit 94.5% LA selectivity and 72.6% PDO conversion at 160 °C for 8 h. Experimental results and DFT calculations suggest that the spinel CuFeOx MN based catalytic PDO transformation follows a favorable pathway of PDO → hydroxyacetone → lactaldehyde → lactic acid for LA production. In addition to the catalytic PDO transformation, the use of CuFeOx MNs can be extended to favor high activity and selectivity in the catalytic transformation of glycerol to LA (98.5% selectivity) and ethylene glycol to glyceric acid (97.8% selectivity). This work highlights the design of an alternative non-noble metal-based CuFeOx MN catalyst for efficiently catalyzing the transformation of bio-based polyols into value-added carboxylic acids.
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JOM
·
2022
·Vol. 75
·期 5
·1515-1529
·
IF 2.597
Ge Yang,Liu Zhihong,Yu Zhiqian,Wang Huanwen,Lu Xingwu,Zhang Leru,Xia Longgong
The present study focused on the Cu-Pb system and investigating the distribution behaviors of various minor elements through the equilibration-quenching-EPMA analysis experimental technique. Obtained results showed that: (1) An intermetallic compound consisting mainly of Cu-Pb-Se-Te formed below 956°C. (2) As, Sb and Sn had similar distribution behaviors, which mainly entered the solid Cu phase at the temperature range of 500–900°C, but became concentrated in the liquid alloy phase at temperature range of 900–1060°C, and their distribution ratios increased along with increasing temperature. (3) Bi was mainly found in the liquid alloy phase, and its distribution ratio ranged from 6.8 to 836.5 at the experimental conditions. (4) Se and Te formed an intermetallic alloy phase under 900°C, and they enriched in the liquid alloy phase between 960°C and 1060°C. (5) Au was mainly found in the solid Cu phase at the temperature range of 500–900°C, and its distribution ratio was about 1.5 at 900–1060°C. The distribution ratio of Ag decreased from 8.7 to 2.3 when increasing the temperature from 500°C to 1060°C. Distribution behavior of As, Sb, Bi and Sn is consistent with their interfacial enthalpies with Cu and Pb.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Suqian Xu,Hanxu Zhu,Wenrui Cao,Zhibin Wen,Jinnan Wang,Corvini Philippe François-Xavier,Thomas Wintgens
Cu-Al 2 O 3 -g-C 3 N 4 and Cu-Al 2 O 3 -C-dots were synthesized for the first time to enhance the catalytic activity and utilization of H 2 O 2 . SEM, TEM, XPS, FT-IR, XRD, TPR and solid-state EPR were used to characterize the catalysts. In the Cu-Al 2 O 3 -g-C 3 N 4 system, the electron-rich centre of Cu and electron-deficient site of Al were formed due to the higher electronegativity of Cu. Moreover, Cu ions could coordinate with the hydroxyl on the tri-s-triazine ring of g-C 3 N 4 or the graphene conjugated π-domains of C-dots via the Cu O C linkage so that the orbital interactions involving electron transport from π → Cu also induced the formation of an electron-rich Cu centre and an electron-deficient π-electron conjugated system, resulting in the strengthening of the dual-reaction centres. This mechanism was validated by Roman, EPR and XPS spectra. In addition, EPR experiments demonstrated that two electron-transfer processes formed OH in the presence of H 2 O 2 . The first electron transfer was from the electron-rich Cu centres to H 2 O 2 , and the other was from H 2 O to the electron-deficient site. Thus, more OH were generated and high H 2 O 2 utilization was achieved in the Cu-Al 2 O 3 -g-C 3 N 4 and Cu-Al 2 O 3 -C-dots suspension. Furthermore, the turnover frequency (TOF) for the Cu-Al 2 O 3 -C-dots and Cu-Al 2 O 3 -g-C 3 N 4 dispersions were determined and were found to be much higher than those of the classic homogeneous Fenton reaction. Thus, Cu-Al 2 O 3 -g-C 3 N 4 and Cu-Al 2 O 3 -C-dots showed high activity and stability for the catalytic degradation of organic pollutants under mild conditions.
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Energy & Environmental Science
·
2018
·Vol. 12
·期 1
·194-205
·
IF 30.067
Jin-Qi Xie,Ya-Qiang Ji,Jia-Hui Kang,Jia-Li Sheng,Da-Sha Mao,Xian-Zhu Fu,Rong Sun,Ching-Ping Wong
Although integrated energy storage devices, such as in-plane micro-supercapacitors (MSCs), are attractive for powering portable microelectronic devices, it is still challenging to develop patterning techniques with high practicability and to rationally design and fabricate electrochemically active materials using feasible procedures. Here, we propose a facile solution-immersion method of fabricating interdigitated copper electrodes with an in situ converted array of Cu(OH)2@FeOOH nanotubes (NTs). A copper current collector can be patterned together with widely employed copper circuits by a facile copper-patterning approach based on cost-effective electroless catalytic deposition of copper with patterned Ag catalysts, which is greatly conducive to the integration of in-plane energy storage devices into microelectronic systems. Furthermore, the rationally designed array of Cu(OH)2@FeOOH NTs, which was converted in situ from the patterned copper electrodes, was demonstrated to be an excellent electrochemically active material with advantages that included a porous structure with a large specific surface area, excellent wettability by the electrolyte, short ion diffusion lengths and one-dimensional electron transport pathway. The resulting MSC devices that were fabricated with the interdigitated Cu(OH)2@FeOOH/Cu electrodes exhibited a high specific capacitance (58.0 mF cm−2 at 0.1 mA cm−2), a high energy density (18.07 μW h cm−2), excellent cycling stability and desirable flexibility.
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Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 21
·10064-10073
·
IF 9.931
Jiahui Kang,Jiali Sheng,Jinqi Xie,Huangqing Ye,Jiahui Chen,Xian-Zhu Fu,Guoping Du,Rong Sun,Ching-Ping Wong
Developing highly efficient and low-cost oxygen evolution reaction (OER) electrocatalysts is highly demanded, as the OER is recognized as a key half-reaction in water splitting for producing hydrogen; however, this still remains a great challenge. Herein, we design three-dimensional (3D) tubular hierarchical core–shell electrocatalysts for the OER using a simple and highly controllable two-step method. The large-scale tubular Cu(OH)2 arrays are directly grown on Cu foam (CF) at room temperature, followed by the growth of highly porous CoNi carbonate hydroxides (CH) via a low-temperature hydrothermal method on the walls of these Cu(OH)2 nanotubes (NTs). The hollow and open-structured core–shell hierarchical Cu(OH)2@CoNiCH NTs/CF electrode with a large surface area and numerous mesoporous and short diffusion paths can provide many active sites, fast electron transport and easy accessibility of water, leading to an excellent OER activity in an alkaline electrolyte with an overpotential of 288 mV and 326 mV at a current density of 30 mA cm−2 and 100 mA cm−2, respectively, also with robust durability. This new structure would open an avenue for the advancement of highly efficient OER electrocatalysts.
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高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Fen Qiao,Zaisi Zhong,Jikang Zhao,Wenjie Liu
Cu-Ni 3 S 2 /NF with varying Cu doping levels were synthesized via a two-step hydrothermal method to investigate Cu's role in enhancing Ni 3 S 2 's alkaline hydrogen evolution reaction (HER). Optimal Cu doping reduced the overpotential to 193.4 mV and Tafel slope to 87.21 mV·dec −1 at 10 mA·cm −2 in 1 M KOH, alongside achieving high conductivity and the largest electrochemical active area (910 cm 2 ). HER performance peaked then declined with excessive Cu, confirming an optimal doping threshold. DFT calculations revealed Cu modulates Ni 3 S 2 's work function and charge transport, elucidating HER enhancement mechanisms. This work provides insights for optimizing Ni 3 S 2 -based HER catalysts through controlled heteroatom doping.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Wenkang Miao,Ronghui Hao,Wanyin Xu,Zihan Wang,Wenxin Lin,Heguang Liu,Wei Ren,Qianqian Li,Runhai Ouyang,Anmin Nie,Jinsong Wu,Hongtao Wang
Single-atom catalysts (SACs) have shown exceptional performance in heterogeneous catalysis, yet their practical application remains hindered largely due to their susceptibility to sintering and subsequent deactivation under harsh reaction conditions. To address the instability, we focused on Cu SACs/Al 2 O 3 and developed a novel dynamic thermostability system by introducing the functional CeO 2 oxide that serves as oxygen reservoir to suppress the sintering. High stability of the Cu SACs was directly observed through in situ aberration-corrected environmental scanning transmission electron microscopy under both thermal oxidation and reduction conditions. Combining first-principles calculations, we revealed that the ultra-stable Cu SACs was achieved by the sustained lattice oxygen supply from reversible ultrasmall CeO 2 (2.25 nm) decomposition to form mobile O x -Cu species, which establishes a dynamic equilibrium between the catalytically active O-Cu and sintering-resistant O 2 -Cu monomers. We found this stabilization strategy by introducing the CeO 2 oxide as oxygen reservoir can be effectively extended to a broad range of SACs (Ag, Co, Pt, Fe, Ni) on 3 different oxide supports (ZnO, TiO 2 , SiO 2 ). We anticipate this strategy and insights can be helpful in designing highly active and stable SACs toward industrialization.
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FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
·
2026
·
IF 1.8
Meijun Yang,Yan Xiao,Zhimin Chang,Zhenhui Chen,Takashi Goto,Song Zhang,Rong Tu
Diamond/Cu composites are promising for thermal management but their poor wettability requires carbide coatings for interfacial modification. This work proposes a novel magnesiothermic reduction method for synthesizing TiC @diamond at low temperatures utilizing a MgCl2–KCl molten salt system with TiO2 as the Ti source. An ∼325 nm TiC coating forms on diamond at 750 °C for 2 hours without graphitization. Interfacial analysis shows a semi-coherent interface with specific crystallographic orientations ([110] TiC // [110] diamond, (1 − 1−1) TiC // (1 − 1−1) diamond). The TiC @diamond/Cu composite shows optimal performance: thermal conductivity (TC) of 689 W/(m · K), 63% International Annealed Copper Standard electrical conductivity and 98.55% relative density, representing increases of 280.66% in thermal conductivity, 90.91% in conductivity and 8.02% in relative density compared to uncoated composites. Its CTE (Coefficient of Thermal Expansion) at 300 °C drops from 17.98 × 10−6 to 6.92 × 10−6/K, a 61.5% relative reduction, significantly enhancing thermal dimensional stability.
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高影响因子
危险品化学品经营许可证（带存储）