APPLIED SURFACE SCIENCE
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2022
·
IF 7.392
Jiahang Qiu,Zhen Xin,Mu Zhang,Xudong Sun
Due to the multiple scattering of microwaves and the existence of electron aggregation polarization at heterogeneous interfaces, the design of hollow or anisotropic microstructures has always been one of the research focuses of microwave absorption materials (MAMs). In this work, an effective strategy has been proposed reasonably to manufacture yolk-shell pompon-like Fe@void@CeO 2 @Ni nanospheres via hydrogen reduction and multiple solvothermal procedures. The results show that the metallic iron core with a diameter of 300 nm and the outer CeO 2 layer with a thickness of 70 nm compound to form a yolk-shell structure, and the metallic nickel nanosheets with a length of about 100 nm are evenly embedded in the CeO 2 layer to form a pompon-like structure. These unique microstructures provide heterogeneous interfacial polarization, three-dimensional conductive networks, and multiple electromagnetic scattering which bring excellent dielectric loss to the composites. Combined with the inherent strong magnetic loss of magnetic metals, as-prepared composites exhibit excellent microwave absorption properties. The minimal RL value reaches −48.9 dB and the efficient absorption bandwidth reaches 14 GHz with the thickness ranges from 2.5 to 7 mm. Hence, this unique microstructural design scheme has great prospects in the field of MAMs.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF LIPID SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.8
Pan Gao,Xinlian Zhao,Xiaoming Jiang,Yuling Zheng,Xinghe Zhang,Wu Zhong,Xingguo Wang
Iron walnut oil is recognized for its high content of polyunsaturated fatty acids and bioactive compounds, which face significant oxidative stability challenges during storage and processing. This study investigates the antioxidant interactions among γ-tocopherol, ellagic acid, and β-sitosterol in iron walnut oil during the thermal oxidation, aiming to enhance its oxidative stability. The antioxidant efficacy of γ-tocopherol, ellagic acid, and β-sitosterol, both individually and in combination, was evaluated. γ-Tocopherol demonstrated the strongest antioxidant activity, and its combination with ellagic acid exhibited a synergistic effect (SE), markedly enhancing the oxidative stability of iron walnut oil by reducing hydrogen peroxide formation and preserving unsaturated fatty acids, whereas β-sitosterol exhibited limited efficacy, suggesting antagonistic interactions. The effects on fatty acid profile and polar components were analyzed via nuclear magnetic resonance (NMR) and total polar content analysis. The findings suggest that optimizing natural antioxidant combinations can effectively extend the shelf life of iron walnut oil and improve its application potential in the food industry, aligning with the demand for clean-label and sustainable products. Practical Application : The study provides valuable insights for food industry professionals working with polyunsaturated fatty acid (PUFA)-rich oils. By demonstrating that γ-tocopherol and ellagic acid significantly enhance the oxidative stability of iron walnut oil, the research offers practical guidance for formulating walnut oil-based products with extended shelf life. These findings can directly inform the development of natural antioxidant systems in food preservation, aligning with consumer demands for clean-label and sustainable products. Researchers can use this information to optimize antioxidant combinations in various food formulations, potentially reducing waste and improving the nutritional profile of food products. The study also highlights the importance of careful antioxidant selection to avoid antagonistic interactions, which is crucial for the industrial application of health-focused products.
研究领域:
食品科学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Xiaoyuan Ma,Kunlong Yang,Jingchao Wang,Siyi Li,Tianyong Zhang,Shuang Jiang,Bin Li
Hydroquinone (HQ) and catechol (CAT) are the important raw materials in the chemical industry, which can be produced through a direct catalytic hydroxylation process using hydrogen peroxide as an oxidant. Herein, we report two novel diiron core complexes (μ-budt)Fe 2 (CO) 5 (DPEphos) (1) and (μ-budt)Fe 2 (CO) 5 (Xantphos) (2) supported by rigid heterocyclic xanthene-like diphosphine ligands which exhibit high selectivity and activity in phenol hydroxylation. The structures of complexes 1 and 2 were characterized by FT-IR, UV–vis, 1 H NMR, 31 P-NMR, X-ray crystallography, while the catalytic products were tested by using HPLC. The FT-IR and UV–vis spectra reveal that two diphosphine ligands exhibit similar impacts on the structure of parent complex (μ-budt)Fe 2 (CO) 6 [budt = SCH(CH 3 )CH 2 CH 2 )S]. Despite the similarity of ligands’ impact on the structure of the parent complex, the catalytic behavior was strongly influenced by the electronic and steric effects. The factors influencing the catalytic activity were optimized, including catalyst dosage, phenol/ H 2 O 2 molar ratio, reaction temperature, and time. Under the optimal conditions, 1 exhibits great catalytic performance with 57.7% phenol conversion and 49.6% DHB yield, both of which are remarkable. The mechanism of phenol hydroxylation using 1 as a catalyst was also proposed. Hydroxyl radicals (•OH) were generated in the catalytic reaction, as demonstrated by electron spin resonance (ESR).
研究领域:
化学
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催化材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2018
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IF 7.082
Yican Wang,Wenlong Wang,Jing Sun,Chenggong Sun,Yukun Feng,Zhe Li
Microwave-metal discharge was proposed as a facile methodology to prepare unique Fe-cored carbon nanocapsules (Fe@CNCs) with high purity, novel stability and extraordinary electromagnetic wave (EMW) absorption performance . The effect of microwave power, irradiation time and cyclohexane/ferrocene ratio on the production of Fe@CNCs was examined and the properties of the nanocapsules, such as their Fe content , phase, yield, degree of graphitization and associated microstructures were investigated in detail. It was found that the prepared Fe@CNCs, which can easily be separated from the reaction system, displayed exceedingly high electromagnetic wave (EMW) absorption performance over the 2–18 GHz range. At the minimal reflection loss (RL) values over −10 dB, the EMW absorption bandwidth can reach up to 13.8 GHz with an absorber thickness of 1.5–5 mm. In addition, novel thermo-oxidative stability and super anti-corrosion property were also obtained for the Fe@CNCs as no signs of any corrosion or oxidative degradation loss were observed from the accelerated degradation tests in air and acid at temperatures up to 420 °C. The exceedingly high EMW absorption performance coupled with the superior anti-degradation and anti-corrosion properties of the prepared nanocomposite microcapsules highlights the novel capability of microwave-metal discharge in synthesizing advanced metal-cored nanocarbon microcapsules with promising application potentials in diverse fields, such as but not limited to microwave absorption, EM shielding and advanced separations etc.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-9
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IF 6.408
Yang Fei,Wu Xiaohong,Li Chen,Chen Yuxiao,Liu Shu,Zhang Cuiling,Xian Yuezhong
A new coordination polymer (Ce-Fe-GMP) with excellent catalytic activity was prepared by a facile route, which was further applied to the detection of F − with high sensitivity and selectivity. The simple doping of Fe 3+ into the coordination network can easily modulate the mixing ratio of Ce 3+ and Ce 4+ in the presence of H 2 O 2 , which can extremely improve the catalytic ability of Ce-Fe-GMP. Based on the synergistic effect, the Ce-Fe-GMP with dual-active sites shows better peroxidase activity than that of Ce-GMP. In addition, we found that F − can inhibit the peroxidase activity of Ce-Fe-GMP because of the coordination structure fragmentation and the regulation of Ce 3+ /Ce 4+ ratio. Therefore, different concentrations of F − can be detected by the colorimetric reaction based on this mechanism. The absorption at 652 nm displays a good linear relationship versus the concentration of F − over the range 2.0 to 100.0 μM. Furthermore, F − in real mineral-mixed samples can be measured with satisfactory results. The colorimetric strategy based on the peroxidase activity of Ce-Fe-GMP is simple and low-cost, which shows the potential applications in the field of on-site environment measurement. Graphical abstract
研究领域:
材料科学
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分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Foods
·
2024
·Vol. 13
·期 9
·1313
·
IF 4.7
Ping Li,Yujia Zhang,Changwei Cao,Yaxi Luo,Huan Kan,Yun Liu
Walnuts play a positive role in human health due to their large amounts of unsaturated fatty acids, whereas lipid oxidation can easily occur during storage. Herein, three natural antioxidants (epicatechin, sesamol, and myricetin) were added to the composite film cross-linked with chitosan and soy protein peptide, and the antioxidant film appropriate for the preservation of walnut kernels fromJuglans sigillatawas screened to improve the storage quality of walnuts. The results showed that three antioxidant films could all enhance the storage performance of walnut kernels, with sesamol being the best. The characterization of antioxidant film cross-linked with chitosan and soy protein peptide containing sesamol (C/S-ses film) revealed that the composite film improved the slow release and stability of sesamol; in addition, the presence of sesamol could effectively reduce the light transmittance and water vapor permeability of the composite film, together with significantly enhancing the antioxidant and antimicrobial activities, resulting in an effective prolongation of the storage period of walnut kernels. These findings indicated that C/S-ses possess excellent potential for retarding the oxidative rancidity of unsaturated fatty acids and will provide an effective strategy for the preservation of walnut kernels.
研究领域:
食品科学
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材料科学
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农业工程
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
·
2025
·
IF 2.4
Pan Gao,Yu Li,Yong Yang,Yuling Zheng,Jiaojiao Yin,Xinghe Zhang,Xingguo Wang
This study investigates the antioxidant interactions of γ-tocopherol, β-sitosterol, and ellagic acid in iron walnut oil within ethanol and ethyl acetate, assessing their impact on oxidative stability. In ethanol, γ-tocopherol and ellagic acid display initial synergistic effects, enhancing free radical scavenging beyond their individual capabilities. Conversely, γ-tocopherol and β-sitosterol show antagonistic effects, reducing their combined scavenging abilities. Kinetic analysis indicates ellagic acid's robust scavenging, generally outperforming combinations of antioxidants. Fourier-transform infrared spectroscopy revealed that solvent polarity significantly impacts hydrogen bonding interactions. Ethanol, with its higher polarity, promoted more extensive hydrogen bonding compared to ethyl acetate, which imposed constraints on such interactions due to its lower polarity. Notably, despite its poor solubility in ethyl acetate, ellagic acid exhibits enhanced synergy with γ-tocopherol, likely via electron transfer. These findings underscore the intricate dynamics of antioxidant interactions, further emphasizing the pivotal role of solvent polarity in modulating these interactions. These results indicated that solvent properties significantly influence antioxidant behavior, yet they also introduce novel insights specific to the iron walnut oil system.
研究领域:
食品化学
·
抗氧化研究
·
脂质科学
·
化学生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Congyi Yang,Weiwen Yuan,Guoxing Liao,Zhe Tang,Tong Zhu,Yifan Jia,Qianqian Yu,LinGe Wang
Vascular defects caused by trauma or vascular diseases can significantly impact normal blood circulation, resulting in serious health complications. Vascular grafts have evolved as a popular approach for vascular reconstruction with promising outcomes. However, four of the greatest challenges for successful application of small-diameter vascular grafts are (1) postoperative anti-infection, (2) preventing thrombosis formation, (3) utilizing the inflammatory response to the graft to induce tissue regeneration and repair, and (4) noninvasive monitoring of the scaffold and integration. The present study demonstrated a basic fibroblast growth factor (bFGF) and oleic acid dispersed Ag@Fe3O4 core–shell nanowires (OA-Ag@Fe3O4 CSNWs) codecorated poly(lactic acid) (PLA)/gelatin (Gel) multifunctional electrospun vascular grafts (bAPG). The Ag@Fe3O4 CSNWs have sustained Ag+ release and exceptional photothermal capabilities to effectively suppress bacterial infections both in vitro and in vivo, noninvasive magnetic resonance imaging (MRI) modality to monitor the position of the graft, and antiplatelet adhesion properties to promise long-term patency. The gradually released bFGF from the bAPG scaffold promotes the M2 macrophage polarization and enhances the recruitment of macrophages, endothelial cells (ECs) and fibroblast cells. This significant regulation of diverse cell behavior has been proven to be beneficial to vascular repair and regeneration both in vitro and in vivo. Therefore, this study supplies a method to prepare multifunctional vascular-repair materials and is expected to represent a significant guidance and reference to the development of biomaterials for vascular tissue engineering.
研究领域:
生物材料
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组织工程
·
血管外科
·
生物医学工程
✓ 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）