JOURNAL OF ELECTRONIC MATERIALS
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2024
·
IF 2.2
Xu Kai,Cui Jinjin,Lin Wanming,Liang Jian
In order to obtain graphene composite materials with good microwave absorption performance, Fe 3 O 4 particles were prepared by a coprecipitation method, and then combined with carboxymethyl cellulose (CMC) to prepare Fe 3 O 4 /CMC particles. Then, Fe 3 O 4 /CMC was successfully combined with graphene oxide (GO) through ultrasonic oscillation to prepare Fe 3 O 4 /CMC/GO composite materials. The structures and morphologies of the materials were characterized by x-ray diffraction (XRD), Raman spectroscopy, and scanning electron microscopy (SEM), and the results showed that spherical Fe 3 O 4 /CMC particles were uniformly distributed on the surface of GO. The electromagnetic parameter testing of Fe 3 O 4 /CMC/GO composite materials in the range of 2–18 GHz revealed that the magnetic loss mechanism was mainly natural resonance loss and exchange resonance loss. What is more, its microwave absorption performance was calculated by using line transmission theory. The microwave absorption performance of the composite showed that the composite had excellent microwave absorption ability when the weight ratio of Fe 3 O 4 /CMC to GO was 3:1. When the thickness of the composite material was 3.5 mm, the minimum reflection loss reached − 36.82 dB, indicating that over 99.9% of the microwaves were absorbed by the composite material, and that the effective absorption bandwidth was 6.10–8.52 GHz, reaching 2.42 GHz.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Yingqing Zhan,Zhihang Long,Xinyi Wan,Jiemin Zhang,Shuangjiang He,Yi He
To obtain high-performance electromagnetic shielding materials, structure and morphology are two key factors. We here developed an efficient and facial method to prepare high-performance 3D carbon nanofiber mats (CFM)/Fe 3 O 4 hybrid electromagnetic shielding materials. For this purpose, the CFM were chemically modified by mussel-inspired poly-dopamine coating, which were further used as templates for decoration of Fe 3 O 4 nanoparticles via solvothermal route. It was found that the Fe 3 O 4 nano-spheres with diameters of 200–250 nm were uniformly coated on the surface of 3D carbon nanofibers. More importantly, the morphology and structure of resulting 3D carbon nanofiber mats/Fe 3 O 4 hybrids could be easily controlled by altering the experiment parameters, which were examined by FT-IR, XPS, TGA, XRD, SEM, and TEM. The measured magnetic properties showed that saturation magnetism and coercivity increased from 13.4 to 39.7 emu/g and 85.3 to 104.6 Oe, respectively. The lowest reflectivity of resulting hybrid was calculated to be −47 dB at 10.0 GHz (2.5 mm). In addition, the reflectivity of 3D carbon nanofiber mats/Fe 3 O 4 hybrid was less than −25 dB in the range of 7–13 GHz. Moreover, the resulting 3D carbon nanofiber mats/Fe 3 O 4 hybrid exhibited an EMI shielding performance of −62.6 dB in the frequency range of 8.2–12.4 GHz. Therefore, 3D carbon fiber mats/Fe 3 O 4 hybrids can be ideal EMI materials with strong absorption, low density, and wide absorption range.
研究领域:
材料科学
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电磁学
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 5
·3505-3510
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IF 1.354
Guo Jian,Wang Yu,Liu Dan-Dan,Wan Rong,Han Guo-Zhi
We report a simple and green approach to synthesize stable water-dispersible silver nanoparticles decorated by magnetic Fe3O4 and graphene oxide (GO). These results of UV-Vis spectra, along with TEM and SEM indicated that the water-dispersible silver nanoparticles
had cluster flat structure and retained the optical properties of the original silver particle. Combining the advantages of Fe3O4 and GO, the composite nanoparticles showed enhanced catalytic activity with good recycling utilization rate by magnetic separation.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INORGANIC BIOCHEMISTRY
·
2018
·
IF 3.063
Min Wang,Xiaofang Fei,Shaowu Lv,Ye Sheng,Haifeng Zou,Yanhua Song,Fei Yan,Qianlong Zhu,Keyan Zheng
In this study, we designed and synthesized two novel fluorescent magnetic nanoparticles . Fe 3 O 4 @SiO 2 -NH-GSH-CdTe (FSGC) (GSH = glutathione) nanoparticles were synthesized using amino-functionalized Fe 3 O 4 @SiO 2 nanoparticles and GSH-stabilized CdTe quantum dots (CdTe QDs), while flexible Fe 3 O 4 @SiO 2 -NH-GSH-CdTe-NH-NH 2 (FSGCN) nanoparticles were synthesized using the FSGC precursor and 1,6-hexamethylenediamine. These two kinds of nanoprobes exhibited excellent magnetic and fluorescent properties. By comparing the fluorescence quenching effect of folic acid (FA) on FSGC and FSGCN, we found that the quenching effect of FA on FSGC was acute and the process was too fast to determine the FA content. However, the quenching effect of FA on flexible FSGCN was mild and hence it could be used as a nanoprobe to determine FA concentration. At physiological pH, the fluorescence quenching effect of FA on the FSGCN nanoprobes was fitted according to the Stern–Volmer equation with a linear response in the concentration range of 0.14 to 4.20 μg mL −1 with a detection limit of 15.1 × 10 −9 g mL −1 (S/N = 3) under optimized experimental conditions. The proposed flexible nanoprobe was successfully used to determine the content of FA in folic acid tablets. Recovery was found to be in the range of 92.7%–105.6% with a relative standard deviation of 1.12%–3.84%. Owing to their good stability, environment-friendly characteristics, high selectivity, and good optical properties and biocompatibility, these nanoprobes have potential for usage in practical applications.
研究领域:
生物医学工程
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分析化学
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产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 3
·1189
·
IF 3.4
Jing Wang,Ke Shan,Yanhua Tang,Na Wu,Nan Li
Magnetic cellulose/Fe3O4beads (CFBs) were fabricated by dispersing Fe3O4particles in a microcrystalline cellulose (MCC) matrix. The CFBs were characterized by X-ray diffraction (XRD), vibrating sample magnetometry (VSM), energy dispersive X-ray spectrometry (EDS), Brunauer–Emmett–Teller (BET) analysis and scanning electron microscopy (SEM). The adsorption behaviors of CFBs were studied by chlortetracycline hydrochloride (CTC) adsorption experiments. By means of adsorption kinetics and isotherms, the adsorption mechanisms were explored. The results show that quasi-spherical CFBs with a BET surface area as high as 119.63 m2/g were successfully tailored, with the high saturation magnetization (Ms > 40 emu/g) guaranteeing the magnetic separation of CFBs from wastewater. The process of adsorbing CTC onto CFBs involves monolayer chemical adsorption, and the maximum adsorption capacity for CTC estimated by the Langmuir model is 89.53 mg/g. The CFB product shows better adsorption performance in acidic solution than in basic solution.Keywords:magnetic cellulose/Fe3O4;adsorption;CTC;adsorption kinetics
研究领域:
材料科学
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环境工程
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Xin Zhang,Jijun Ding,Jiayuan Xu,Haixia Chen,Haiwei Fu
Traditional oil-water separation methods have low separation efficiency and are prone to environmental pollution. The development of low-cost and environmentally friendly novel oil-water separation membranes is of wide interest nowadays. In this work, stearic acid modified Fe 3 O 4 /Y 2 O 3 (Fe 3 O 4 /Y 2 O 3 /SA) composite membranes are prepared on PET and cotton fabric using spraying and impregnation methods. Both Y 2 O 3 and Fe 3 O 4 nanoparticles are compounded on the surface of the substrate and modified using stearic acid impregnation. The results show that Fe 3 O 4 /Y 2 O 3 /SA composite membrane has a water contact angle of 152.5° and exhibits super hydrophobicity/lipophilicity. At the same time, the composite membrane has excellent oil-water separation performance, including high separation efficiency (99.92 %) for a variety of oil-water mixtures, and good stability in 15 cycles of separation tests. The mechanism of oil-water separation is discussed.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 99
·期 7
·1637-1645
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IF 2.8
Wei Wu,Xiaoqian Ma,Rui Wang,Dayong Zhang
BACKGROUND Demulsification using chitosan (CS)-coated magnetic nanomaterials has garnered significant attention. However, traditional methods for synthesizing chitosan (CS)-coated magnetic nanomaterials are often contaminated, laborious, and time-consuming. Moreover, they showed poor demulsification efficiency due to the occupation of free amino groups in CS by crosslinking agents. RESULTS CS-coated Fe 3 O 4 magnetic nanoparticles (MNPs) were synthesized using humic acid (HA) as a bridge. The Fe 3 O 4 /HA/CS MNPs are recyclable demulsifiers for hexadecane-water microemulsions. The impacts of MNP dosage, separation time, and pH on demulsification efficiency were studied comprehensively. Compared with Fe 3 O 4 /HA and Fe 3 O 4 /CS MNPs, the demulsification efficiency of the Fe 3 O 4 /HA/CS MNPs was superior. The pseudo-second-order kinetic model and the Sips isotherm best describe the demulsification process. Combined with the influence factors of demulsification efficiency, the demulsification mechanism involves electrostatic interactions between MNPs and oil microparticles. The maximum adsorption capacity for oil by the Fe 3 O 4 /HA/CS MNPs was 91.73 mg g −1 . CONCLUSION This research presents a new method for connecting CS to MNPs with a high surface positive charge. As synthesized Fe 3 O 4 /HA/CS MNPs is expected to serve as highly efficient and recyclable demulsifiers for emulsified oil wastewater. © 2024 Society of Chemical Industry (SCI).
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMPHYSCHEM
·
2012
·Vol. 13
·期 18
·4142-4147
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IF 3.412
Xinmei Zhao,Narayan S. Hosmane,Aiguo Wu
Graphical Link up: ortho -Phenylenediamine (PDA) acts as a linker in the deposition of gold nanoparticles on the surfaces of Fe 3 O 4 microspheres. After coating with PDA, the morphology of the microspheres changes significantly to nanoparticle clusters, and this is ideal for the deposition of the gold nanoparticles. The resulting Fe 3 O 4 /Au nanocomposites exhibit enhanced magnetism so that they can be recovered and recycled easily. 1,2-Diaminobenzene, popularly known as ortho -phenylenediamine (PDA), is found to be a prototype spacer for the deposition of gold nanoparticles on the surfaces of Fe 3 O 4 microspheres. Upon carbonization with PDA, the morphology of the product changes significantly, and the resulting nanocomposites exhibit enhanced magnetism beyond the saturation value of Fe 3 O 4 . The Fe 3 O 4 /Au nanocomposites show good surface-enhanced Raman spectroscopy activity with a detection limit of 10 −15 M .
研究领域:
纳米技术
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材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBON
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2021
·
IF 9.594
Zhouyu Tong,Zijian Liao,Yanyan Liu,Mingliang Ma,Yuxin Bi,Weibo Huang,Yong Ma,Mingtao Qiao,Guanglei Wu
Designing one-dimensional (1D) magnetic-carbon composites microwave absorbers is a promising strategy that can meet the current demand for high-performance microwave absorption (MA) materials. In this work, hierarchical structured Fe 3 O 4 /Fe@C@MoS 2 nanofibers were successfully obtained via a simple three-step method. 1D Fe 3 O 4 /Fe@C nanofibers were fabricated through electrospinning technology and in-situ polymerization followed by carbonization and reduction in H 2 /N 2 atmosphere. MoS 2 nanosheets grew irregularly on the surface of 1D Fe 3 O 4 /Fe@C nanofibers to form the flower-like structure. The morphology, composition and magnetism of samples were systematically investigated. Furthermore, electromagnetic characteristics and MA properties of Fe 3 O 4 /Fe@C nanofibers and Fe 3 O 4 /Fe@C@MoS 2 nanofibers were compared. The minimum reflection loss (RL min ) of Fe 3 O 4 /Fe@C@MoS 2 nanofibers could reach −53.79 dB at 11.12 GHz and the corresponding absorption bandwidth (RL < -10 dB) of 4.4 GHz was achieved at the absorber thickness of 2.24 mm. This work combines electrospinning technology with traditional chemical synthesis to prepare a novel 1D core-shell microwave absorber, which provides some inspiration for preparing MA material in the future.
研究领域:
材料科学
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电磁学
·
化学合成
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2019
·Vol. 32
·期 9
·2903-2911
·
IF 1.13
Sun Xiaoning,Wang Song,Wang Yaping,Sun Kangning
A simple one-step solvothermal method is proposed to prepare hydrophobic Fe 3 O 4 nanoparticles (MNPs) using iron acetylacetonate (Fe(acac) 3 ), oleylamine (OAm), and ethylene glycol (EG). X-ray powder diffraction, scanning electron microscope, infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectrometry, and vibrating sample magnetometer are used to characterize the structure, morphology, and properties of products. The testing results indicate that the as-synthesized products are spherical-like hydrophobic MNPs, superparamagnetic at room temperature, with a saturation magnetization up to 76.8 emu/g. The good hydrophobic property of MNPs is attributed to the coverage of oleylamine, without causing a remarkable loss of magnetic property. In addition, the influences of material ratio, aging time, oleic acid, and stearic acid used as additives are studied in our research.
研究领域:
材料科学
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-8
·
IF 5.228
Li Jingshuai,Wang Qi,Guo Zhankui,Ma Hongmin,Zhang Yong,Wang Bing,Bin Du,Wei Qin
The combination of fluorescent nanoparticles and specific molecular probes appears to be a promising strategy for developing fluorescent nanoprobes. In this work, L-cysteine (L-Cys) capped Fe 3 O 4 @ZnO core-shell nanoparticles were synthesized for the highly selective detection of Fe 3+ . The proposed nanoprobe shows excellent fluorescent property and high selectivity for Fe 3+ due to the binding affinity of L-Cys with Fe 3+ . The binding of Fe 3+ to the nanoprobe induces an apparent decrease of the fluorescence. Thus a highly selective fluorescent chemosensor for Fe 3+ was proposed based on Fe 3 O 4 @ZnO nanoprobe. The magnetism of the nanoprobe enables the facile separation of bound Fe 3+ from the sample solution with an external magnetic field, which effectively reduces the interference of matrix. The detection limit was 3 nmol L −1 with a rapid response time of less than 1 min. The proposed method was applied to detect Fe 3+ in both serum and wastewater samples with acceptable performance. All above features indicated that the proposed fluorescent probe as sensing platform held great potential in applications of biological and analytical field.
研究领域:
分析化学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2019
·
IF 3.507
Zhiyuan Feng,Yekun Zhu,Qin Zhou,Ying Wu,Tinghua Wu
In this work, a magnetic WO 3 /Fe 3 O 4 catalyst was synthesized by grinding-calcination method and applied in the deep oxidative desulfurization of dibenzothiophene (DBT). The results showed that the as-synthesized WO 3 /Fe 3 O 4 had high catalytic efficiency for sulfur-removal. The content of WO 3 , amount of the catalyst, TBHP/DBT molar ratio and reaction temperature had significant effects on the desulfurization efficiency. The highest DBT conversion of 92.3% was achieved on 35% WO 3 /Fe 3 O 4 catalyst with the O/S ratio of 12:1 at 100 °C for 4.5 h. The results of this study revealed that WO 3 /Fe 3 O 4 catalyst has excellent potential for desulfurization properties because of its high catalytic activity and easy separation ability under an external magnetic field.
研究领域:
化学工程
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环境科学
·
材料科学
✓ 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）