CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chao Wang,Nankun Chen,Yiyao Xiao,Jiahao He,Rui Han,Ningning Song
Fe 3 O 4 @SiO 2 composites with different morphologies (hollow nanorods , porous nanorods, and flower-like nanoparticles) were constructed using different preparation methods. Considerably enhancement of resonance frequency and permeability beyond Snoek’s limitation were observed in the Fe 3 O 4 @SiO 2 composites with shape anisotropy and porous core-shell nanostructure . The resonance frequency of porous Fe 3 O 4 @SiO 2 nanorods enhanced to 4.21 GHz, which is much higher than the natural resonance frequency of 1.2 GHz for Fe 3 O 4 bulk. The minimum reflection loss (RL min ) of Fe 3 O 4 @SiO 2 porous nanorods reached -59.49 dB at 8.89 GHz, and its effective bandwidth (RL < -10 dB) covered 4.52 GHz at a thickness of 3.18 mm. In addition, the radar scattering cross section (RCS) reduction value reached more than 48 dBm 2 after removing the background. Our study provides insight into the relationship between anisotropy, core-shell structure, morphology of nanoparticles and corresponding microwave performance, and provides a reference scheme for the fabrication of high-performance lightweight microwave absorbing materials.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 14
·4431
·
IF 4.927
Xiangqian Li,Qin Wen,Jiannian Chen,Wenjie Sun,Yuhui Zheng,Chenggang Long,Qianming Wang
The presence of nitrite (NO2−) in water and food leads to serious problems in public health and the environment. Therefore, it is important to develop a rapid and efficient method for the selective detection of NO2−. In this work, the synthesis and characterization of magnetic Fe3O4@SiO2-TbDPA nanoprobe have been carried out. The Fe3O4@SiO2-TbDPA aqueous solution exhibits a strong green emission. Due to the addition of various concentrations of NO2−(0–100 μM), the fluorescence intensity has been suppressed. The nanoprobe Fe3O4@SiO2-TbDPA exhibits excellent selectivity and sensitivity toward NO2−ions. Excellent linearity is obtained in the range of 5–80 μM with a detection limit of 1.03 μM. Furthermore, the presence of magnetic Fe3O4nanoparticles in Fe3O4@SiO2-TbDPA nanospheres will also facilitate the effective separation of Fe3O4@SiO2-TbDPA from the aqueous solution. Our proposed strategy is expected to fabricate an organic-inorganic hybrid magnetic nanomaterial and can be used as an efficient sensor. It has been shown that this new strategy has numerous advantages, such as high stability, selectivity, and simplicity of operation. It demonstrates great potential for simple and convenient NO2−detection. It may expand to a variety of ranges in environmental monitoring and biomedical fields.Keywords:nitrite;core-shell nanospheres;fluorescent probe
研究领域:
分析化学
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环境科学
·
生物医学工程
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DOI
PubMed
高影响因子
FUEL
·
2026
·
IF 7.8
Qianqian Chen,Subing Fan,Junmin Lv,Tiansheng Zhao
The purpose of the olefin hydroformylation-hydrogenation tandem reaction for alcohol synthesis is to design a highly efficient and stable heterogeneous catalyst. In this study, a novel heterogeneous magnetic nanoparticle-supported rhodium-cobalt bimetallic core–shell catalyst was prepared, which exhibits excellent synergistic catalytic performance and enables a one-step alcohol synthesis process. The magnetic support Fe 3 O 4 allows for rapid separation of the catalyst from reaction products under an external magnetic field. The 7.5Co0.5Rh/Fe 3 O 4 @SiO 2 magnetic core–shell catalyst was successfully prepared by loading active metals via a one-pot impregnation method and performing silica coating using the Stöber method. It shows outstanding olefin conversion (99.71%) and alcohol selectivity (91.17%). The effect of preparation conditions, process conditions, and the universality of substrates were investigated in detail. The catalyst was reused 5 times, and the performance differences between the core–shell catalyst and the traditional impregnated catalyst with the same support, as well as the differences in metal leaching during the reaction, were compared. In addition, the catalyst could participate in the reaction directly without prior reduction, avoiding the additional costs associated with subsequent reduction steps.
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DOI
高影响因子
Journal of Central South University
·
2018
·Vol. 25
·期 4
·709-718
·
IF 0.761
Tian Qing-hua,Wang Xiao-yang,Mao Fang-fang,Guo Xue-yi
The purpose of this study is to explore the adsorption performance of meso-2, 3-dimercaptosuccinic acid (DMSA) modified Fe3O4@SiO2 magnetic nanocomposite (Fe 3 O 4 @SiO 2 DMSA) for Pb 2+ ions removal from aqueous solutions. The effects of solution pH, initial concentration of Pb2+ions, contact time, and temperature on the amount of Pb2+ adsorbed were investigated. Adsorption isotherms, adsorption kinetics, and thermodynamic analysis were also studied. The results showed that the maximum adsorption capacity of the Fe 3 O 4 @SiO 2 DMSA composite is 50.5 mg/g at 298 K, which is higher than that of Fe3O4 and Fe 3 O 4 @SiO 2 magnetic nanoparticles. The adsorption process agreed well with Langmuir adsorption isotherm models and pseudo second-order kinetics. The thermodynamic analysis revealed that the adsorption was spontaneous, endothermic and energetically driven in nature.
研究领域:
环境科学
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材料科学
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纳米技术
·
水处理
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Zhengwen Wei,Xuedong Ma,Yaoyao Zhang,Yingmin Guo,Wei Wang,Zhen-Yi Jiang
Phenanthrene (PHE), as one of representative polycyclic aromatic hydrocarbons (PAHs) can cause serious adverse effects on human health, developing effective adsorbents to alleviate PHE contamination is in urgent demand. A novel Fe 3 O 4 -SiO 2 -Dimethoxydiphenylsilane (Fe 3 O 4 -SiO 2 -2DMDPS) nanocomposite was fabricated from encapsulation and grafting process. Magnetic Fe 3 O 4 nanoparticles were served as preliminary matrix material , SiO 2 was used to link the magnetic oxide and provide hydroxyl groups for proceeding the silane coupling reaction subsequently, and the aromatic rings in DMDPS could provide active sites for PHE adsorption via π-π interaction. SEM-EDS, TEM , BET, VSM, XRD, FTIR, Raman, Zeta potential , and XPS techniques were used to characterize magnetic nanocomposite. The prepared Fe 3 O 4 -SiO 2 -2DMDPS exhibited an excellent adsorption performance towards PHE, it could maintain 75.97% adsorption capacity after four regeneration cycles. Homogeneous adsorption acted crucial role in the whole adsorption process and film diffusion was the rate-controlling procedure. Theoretical calculations put forward the most favorable bonding modes between Fe 3 O 4 -SiO 2 -2DMDPS and PHE molecules, confirmed the π-π interaction was valid and it usually existed in the form of parallel-displaced. This work might aid us to develop effective modification strategy for Fe 3 O 4 nanoparticles and expand its application in the PAHs removing field.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2014
·Vol. 182
·期 3
·547-555
·
IF 3.719
Liu Jinshui,Liu Guoning,Zang Lingjie,Liu Wenxiu
Calcein was first covalently grafted onto the surface of magnetic silica nanoparticles to obtain a novel fluorescent nanoprobe for sensitive and selective determination of Cu(II) ion. The nanoparticles were synthesized in a two-step reaction under mild conditions and characterized using small-angle X-ray scattering, Fourier transform infrared spectroscopy, transmission electron microscopy, and thermogravimetric analysis. The nanoprobe also displays good selectivity over other metal ions and is highly stable under conditions of high ionic strength. The response to Cu(II) ranges from 80 nM to 1.25 μM. The detection limit (LOD) is 43 nM which is lower than previously reported LODs. The probe can be regenerated by adding the complexing agent EDTA and also can be separated from a sample mixture by applying a magnetic field. We conclude that this method represents a new and convenient approach to the development of magnetic and reusable optical probes.
Calcein was first covalently grafted onto the surface of magnetic silica nanoparticles to obtain a novel fluorescent nanoprobe for sensitive and selective determination of Cu(II) ion. The nanoprobe displays good selectivity over other metal ions and is highly stable under conditions of high ionic strength.
研究领域:
分析化学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Li Ye,Jiacheng Li,Xiaolei Li,Pengcheng Zhu,Tianxing Wang,Yao Zhong,Dingyu Song,Lin Zhuang
Tremendous efforts have been dedicated to developing waste dye treatment methods that are recyclable and efficient. However, challenges such as high toxicity, poor dispersion in aqueous solutions, and the high residual rate problems of some catalysts persist. Herein, inspired by the superparamagnetic properties and the electrostatic absorption capacity of Fe3O4 and the photocatalytic activity of NiO, flower-like, adsorptive-photocatalytic dual-effect dye scavengers, named Fe3O4@SiO2@NiO magnetic nanoparticles (FSN MNPs), are fabricated. The outermost NiO layer with a large specific surface area of 211.876 m2/g effectively adsorbs dyes via electrostatic interactions. More importantly, the introduction of an inert protective SiO2 layer between the Fe3O4 core and NiO shell enhances the chemical stability and catalytic performance of the FSN MNPs. These FSN MNPs are recyclable and can be reused at least six times. Their photocatalytic activity against rhodamine B (RhB) was assessed. They show a high RhB degradation efficiency of up to 99.50%. Therefore, the FSN MNPs are promising catalysts for dye degradation in industrial wastewater treatment applications.
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DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 13
·8726-8734
·
IF 3.9
Mengnan Liang,Na Li,Hao Zhang,Ling Ma,Ke Wang
A novel magnetic organic polymer Fe3O4@SiO2@Tb–PDAN was designed and synthesized, which was used as an adsorbent for magnetic solid-phase extraction (MSPE) of 16 macrolides (MALs) in water and honey. The synthesized adsorbent was characterized using techniques including scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). Then several parameters of the extraction process were further optimized. Under the optimized conditions, an MSPE-LC-MS/MS method was established for extraction and determination of 16 MALs, which showed good linearity (r ≥ 0.999), low limits of detection (0.001–0.012 μg L−1 for water and 0.001–0.367 μg kg−1 for honey) and satisfactory recoveries (70.02–118.91%) with the relative standard deviations (RSDs) lower than 10.0%. This established method was then successfully applied to detect MALs in real samples, which suggested that Fe3O4@SiO2@Tb–PDAN was a potential magnetic adsorbent for efficient extraction and analysis of MALs.
研究领域:
分析化学
·
环境科学
·
食品科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2014
·Vol. 406
·期 28
·7213-7220
·
IF 3.578
Gao Lin,Wang Jixiang,Li Xiuying,Yan Yongsheng,Li Chunxiang,Pan Jianming
In this study, we report here a general protocol for making core-shell magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs (MPS = 3-(methacryloxyl) propyl trimethoxysilane, MIPs = molecularly imprinted polymers, Fe 3 O 4 /SiO 2 -MPS as core, MIPs as shell) via a surface molecular imprinting technique for optical detection of trace λ -cyhalothrin. The fluorescent molecularly imprinted polymer shell was first prepared by copolymerization of acrylamide with a small quantity of allyl fluorescein in the presence of λ -cyhalothrin to form recognition sites without doping. The magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs exhibited paramagnetism, high fluorescence intensity, and highly selective recognition. Using fluorescence quenching as a detecting tool, Fe 3 O 4 /SiO 2 -MPS/MIPs were successfully applied to selectively and sensitively detect λ -cyhalothrin, and a linear relationship could be obtained covering a wide concentration range of 0–50 nM with a correlation coefficient of 0.9962 described by the Stern-Volmer equation. The experimental results of practical detection revealed that magnetic Fe 3 O 4 /SiO 2 -MPS/MIPs as an attractive recognition element was satisfactory for determination of trace λ -cyhalothrin in honey samples. This study, therefore, demonstrated the potential of MIPs for detection of λ -cyhalothrin in food.
研究领域:
分析化学
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTEGRATED FERROELECTRICS
·
2017
·
IF 0.457
Wen-Lin Wang,Li-Long Gao,Hai-Lin Cong,Bing Yu,Chun-Bo Mou
Magnetic polyurea microspheres (MPUMs) were prepared by one-step precipitation polymerization of isophorone diisocyanate (IPDI) with water in the mixed solvent of water and acetone. Pre-prepared monodisperse and magnetic Fe3O4@SiO2 nanoparticles were added before polymerization. Then the surface morphologies of MPUMS were characterized by scanning electron microscopy (SEM). MPUMs exhibit good recycling stability assisted by the convenient magnetic separation. Therefore, MPUMs can serve as a promising carrier candidate for adsorption of dyes and treating sewage.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Hai-Lin Cong,Qian-Qian Song,Song Wang,Bo-Ya Yu,Zhong-Min Geng,You-Qing Shen,Bing Yu
In this article, a magnetic-responsive microfiltration membrane based on three-dimensional (3 D) inverse colloidal crystal (ICC) was prepared with relatively simple approach. We designed the ICC membrane using self-assembly of Fe3O4@SiO2 colloidal crystal into a colloidal crystal template. The resulting close-packed colloidal crystal was infiltrated with a reactive monomer solution. After polymerization, the silica spheres were etched away, resulting in an ICC membrane with Fe3O4 nanoparticles inside. The typical ICC membrane was characterized by SEM and XRD. Meanwhile, We used the KCl diffusion to test the permeability of the membrane. The results illustrated that the highly ordered permeable polymer membrane was successfully prepared by using Fe3O4@SiO2 colloidal crystals as the templates. Furthermore, the functional ICC membrane exhibited excellent magnetic-responsive gating property to separation. The smart environment-responsive gating membranes have potential applications in filtration, sensors and other applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zeyu Ma,Yuhao Wu,Shan Lu,Jianing Li,Jianbo Liu,Xiaodong Huang,Xiaodong Zhang,Yin Zhang,Guangneng Dong,Liguo Qin,Sen Yang
3D printing has shown promise in the development of notable sensing and health detection devices. Nonetheless, challenges remain in the concurrent development of highly durable wearable sensors with low-friction surfaces. This challenge serves as a limiting factor in the operational lifespans of these sensors. In this study, a magnetically assisted 3D printing technique is developed to fabricate composites reinforced with magnetic Fe 3 O 4 @SiO 2 nanochains (NCs) with dimensions of 60.2 µm in length (L) and 0.2 µm in diameter (D), indicating an L:D ratio exceeding 300. By applying a vertical magnetic field and extrusion flow field to the sensor's surface layer, the NCs can be arranged differently (together with the printed textures), reducing the coefficient of friction by 27.7% and improving the wear resistance. This approach is inspired by nacre, known for its impressive durability and resilience. A motion monitoring sensor with an extended lifespan is successfully fabricated by using liquid metal ink integrated with an anti-wear layer. These findings offer significant insights into the evolution of wearable sensors, demonstrating their adaptability to multi-material printing and resulting in improved performance and service lives.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
增材制造
✓ 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）