SCRIPTA MATERIALIA
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2024
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IF 5.3
Mengyun Jia,Dingliang Liang,Qing Du,Hui Wang,Yuan Wu,Suihe Jiang,Xiaobin Zhang,Haihui Ruan,Xiongjun Liu,Zhaoping Lu
Magnetothermal therapy (MT) is a noninvasive cancer treatment that has shown great promise in recent years. However, the low magnetothermal efficiency of the existing magnetic nanoparticles used in MT has been an obstacle to their widespread applications. In this work, we report a new class of Fe-Co-Ni-Cu high-entropy magnetic nanoparticles (HEMNPs) with exceptional magnetothermal properties synthesized by a thermal decomposition method. The fabricated HEMNPs, having an average diameter of 60–70 nm, exhibited a saturation magnetization of 42.4 emu/g and coercivity of 129.5 Oe. The hyperthermia measurement reveals that the HEMNPs have a maximum specific loss power of 202 W/g at the concentration of 2 mg/ml under an alternating magnetic field with an intensity of 46 Oe and a frequency of 266 kHz, demonstrating the great potential for MT applications. Our results demonstrate that the high-entropy concept can be extended to develop high-performance magnetic nanoparticles for MT applications.
研究领域:
材料科学
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纳米技术
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癌症研究
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治疗工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Ao Ding,Yupeng He,Fei-Fei Chen,Yan Yu
Bacterial infections result in significant burdens on public health, especially with the increasing prevalence of antibiotic resistance owing to the overuse of antibiotics. The development of the next-generation nanoantibacterial materials as alternatives to antibiotics is urgently needed. Metal–organic frameworks (MOFs) have been emerging as promising antibacterial materials. However, the impact of metal centers on the properties and antibacterial activity of MOFs has not been clarified to date. In this work, five M-MOF nanomaterials (M = Fe, Co, Ni, Cu, Zn) are synthesized with 2-methylimidazole as an organic ligand. Subsequently, the minimum inhibitory concentration (MIC), minimum bactericidal concentration, and time-kill curves are studied to evaluate their antibacterial activity. In addition, the destruction of the bacterial cells after treatment with M-MOFs is observed via scanning electron microscopy. The experimental results demonstrate that the Co-MOF and Zn-MOF polyhedra exhibit optimal antibacterial activity. They can effectively inhibit the growth of both Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus at a low concentration. On the other hand, the Fe-MOF irregular particles show the weakest antibacterial activity among five M-MOFs and the antibacterial activity of the Ni-MOF and Cu-MOF nanosheets are comparable to each other. The huge difference in antibacterial activity of M-MOFs is attributed to the difference in the shape and size, specific surface area, surface charge, ion release, and production of reactive oxygen species. Overall, this study clarifies the relationship between metal centers in M-MOFs and their antibacterial activity.
研究领域:
微生物学
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材料科学
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药理学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 10
·6131-6138
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IF 9.3
Yan Wang,Xuan Wang,Yonghao Dong,Mingli Peng,Lina Guo,Mengyao Cui,Yuan He,Jiabao Yi,Huijun Ma,Huan Zhang,Haiming Fan
The selective oxidation of alcohols has drawn significant attention in heterogeneous catalysis with the increasing use of Pickering interfacial catalysis (PIC) for green transformations of alcohols. However, it is still highly desirable to design and develop a solid catalyst with easy separation and recycling, made from abundant resources through a simple synthesis route, for the selective oxidation of alcohols. In this study, ferrite nanoparticles, synthesized via a hydrothermal process, were employed to act as a stabilizer and catalyst in PIC for the oxidation of benzyl alcohol using H2O2. The ferrite nanoparticles exhibited higher catalytic performance in PIC than in acetonitrile. The turnover number (TON) of the nanocatalyst in PIC was found to be 1.5–4 times higher than that in acetonitrile, and the reaction constant in PIC (kPIC = 0.712 h−1) was almost twice that in acetonitrile (kCH3CN = 0.310 h−1) for MnFe2O4 nanoparticles. Moreover, other alcohols could also be oxidized with moderately high conversion and selectivity in PIC. Significantly, the ferrite nanocatalyst could be easily separated from PIC using a magnet for reuse, achieving 88% BzOH conversion after five cycles. The use of hazardous organic solvents was avoided in PIC, making it a more advanced, green and sustainable reaction system.
研究领域:
化学工程
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催化科学
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绿色化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Xinyue Zhang,Yichu Ma,Hengqiang Yang,Chenglong Shi,Qingjun Zhou
The development of electrode materials with high catalytic activity at intermediate temperature (600–800 °C) is essential for improving the output performance of solid oxide fuel cells. Here, we report low cobalt-based Sr 2 Fe 1.5-3x Ni x Cu x Co x Mo 0.5 O 6 (x = 0.05, 0.1, 0.15, SF x NCCM) as symmetrical electrode materials. With effective control of the anode side, Fe–Co–Ni–Cu nanoparticles precipitate from and are uniformly distributed across the parent surface, enhancing the electrode material's electrochemical performance. The output performance of single cell is better than that of Sr 2 Fe 1.5 Mo 0.5 O 6-δ symmetric cell without nanoparticle modification. In addition, the maximum power densities of the single cell with ∼300 μm thick Ce 0.9 Gd 0.1 O 1.95 as electrolyte and SF x NCCM as symmetrical electrode material reached 750, 620 and 621 mW cm −2 at 800 °C, respectively. The reversibility of nanoparticles exsolution and phase structure transformation are confirmed. The in-situ self-assembled electrode materials reported in this study provide a foundation for future research on fuel cell electrodes.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2023
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IF 2.7
Qingzhi Zhu,Xiang Luo,Haifeng Li,Jiabao Zang,Jihui Sun,Xutao Yan,Yijian Liu
Pure magnetic materials always exhibit mediocre microwave absorption performance due to the poor impedance matching and negligible dielectric loss capability. In this study, a novel porous aggregates of multi-element doped Fe 3 O 4 /(Fe, Co, Ni, Cu) alloys (denoted as DF/alloys) composite which is composed of magnetic/magnetic heterostructure with excellent microwave absorption performance were prepared. By reducing part of the ferrimagnetic spinel into ferromagnetic alloy, the saturation magnetization M s was enlarged which is beneficial to exceeding the Snoek′s limit, and the magnetic loss capability was further enhanced significantly. Furthermore, the abundant heterogeneous interfaces in the DF/alloys composites have greatly improved the dielectric loss capability and balanced the complex permittivity and the complex permeability, and achieved superior impedance matching of the magnetic/magnetic heterogeneous DF/alloys composites. When the loading ratio (DF/alloys to paraffin mass ratio) was only 30 wt%, the widest effective absorption bandwidth ( EAB ) reached 5.58 GHz (3.2 mm). when the loading ratio was up to 50 wt%, the widest EAB (6.4 GHz) was achieved at 2.0 mm and the minimum reflection loss ( RL min ) reached −49.3 dB at 4.15 GHz. As microwave absorption materials, the DF/alloys composites are extremely promising and competitive.
研究领域:
材料科学
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电磁学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）