INTEGRATED FERROELECTRICS
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2017
·
IF 0.457
Cheng-Hao Lu,Gui-Huan Chen,Bing Yu,Hai-Lin Cong,Ling-Min Kong,Lin Guo
Core-shell nanoparticles (NPs) became the focus of scientific research in recent years. The design and controllable structures of nanocomposites with core-shell structure become increasingly important research fields at the forefront of materials science recently. In this paper, a series of templates for preparation of core-shell structure such as monodisperse silica (SiO2) NPs and PVP-coated low-cross linked polystyrene (PS) NPs were successful synthesized. In order to further study the key conditions for the formation of core-shell structure, we further prepared Fe3O4@SiO2 nanoparticles. The good properties of the core-shell structure in the field of catalysis, gas separation and biomedicine have a good prospect.
研究领域:
材料科学
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纳米技术
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生物医学工程
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催化化学
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分子影像
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高影响因子
PHOSPHORUS SULFUR AND SILICON AND THE RELATED ELEMENTS
·
2022
·
IF 1.052
Xin Zhang,Liang Wang,Qiaoyong Zhu
A chlorosulfonylation of vinylarenes using magnetic metal–organic framework (MOF) composite Cu-BTC@Fe3O4 (BTC = 1,3,5-benzenetricarboxylate) as the catalyst has been developed. This protocol features easily accessible starting materials, good functional group compatibility and simple recovery of the catalyst. The recovered catalyst could be reused for at least successive five runs with only a slight decrease in its catalytic activity.
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高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2022
·
IF 2.042
Jun Cao,Qi Sun,Peng Wang,Jie Shen,Xue Dai
In order to solve the problem that separating zeolite 4A from solutions, we have synthesized Fe3O4/zeolite 4A magnetic nanocomposite by hydrothermal method. It is characterized by Transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Vibrating Sample Magnetometer (VSM), scanning electron microscope (SEM) and Brunner-Emmet-teller (BET). The XRD result shows that Fe3O4/zeolite 4A magnetic nanocomposite has a good crystal structure. It also shows that Fe3O4/zeolite 4A magnetic nanocomposite contains two phases of zeolite 4A and Fe3O4 MNP. The optimal sample (Z-2) was judged by the calculation of crystallinity. The successful combination of zeolite 4A and Fe3O4 MNP was visually observed through SEM technology. The functional groups of Fe3O4/zeolite 4A magnetic nanocomposite were characterized by FTIR technology. The TEM result shows that some Fe3O4 MNPs enter zeolite 4A, which further clarifies the microstructure of Fe3O4/zeolite 4A magnetic nanocomposite. N2 adsorption-desorption technique confirms that Fe3O4/zeolite 4A magnetic nanocomposite SBET is 55.3374 m2/g and Dave is 9.7128 nm. VSM result shows that Fe3O4/zeolite 4A magnetic nanocomposite magnetization is 18.4534 emu/g. Simulation experiment shows that Fe3O4/zeolite 4A magnetic nanocomposite exhibit a fast response to an external magnetic field.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Xiahong Shi,Xiaoting Zhang,Wei Gao,Yalin Zhang,Defu He
Microplastics (MPs) have been widely detected in aquatic environments, and become emerging contaminants of growing concern. It is urgently needed to explore how to effectively remove MPs from water. This study first established an alternative method of removing MPs by magnetic nano-Fe 3 O 4 . Results showed that 1.3 g·L −1 nano-Fe 3 O 4 and 150 min treatments caused optimal magnetization of MPs via surface absorption. Then, magnetized MPs in water can be conveniently removed by suction of the magnet. The average removal rate of four common types of MPs including polyethylene, polypropylene , polystyrene and polyethylene terephthalate in size of approximately 200–900 μm was 86.87 ± 6.92%, 85.05 ± 4.70%, 86.11 ± 6.21%, and 62.83 ± 8.34%, respectively. The removal rate varied among polymer- and size-different MPs, and was positively related to the density of nano-Fe 3 O 4 absorbed on MP surfaces. In addition, the removal rate of MPs in artificial seawater was relatively high in comparison to pure water. Furthermore, the established approach was effectively applied to remove MPs in environmental water bodies including river water, domestic sewage, and natural seawater, with the removal rate of higher than 80%. Altogether, this study provided a novel and simple removal approach to remove MPs in water, which has a certain application prospect.
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DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 12
·6399-6406
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IF 2.097
Yao Lihui,Wang Yajuan,Li Ya,Jiang Zhiqiang,Qiu Dan
A series of Fe 3 O 4 /PLA composites are controllably prepared using consecutive reaction route. The neat PLA and its composites are characterized by FT-IR, WAXRD and XPS for composition analysis. The performances of PLA and Fe 3 O 4 /PLA composites are, respectively, determined by SEM, VSM, CAM, POM, DSC and TG. Fe 3 O 4 particles are a good dispersion in the PLA matrix, and the saturation magnetization values of PLA have increased from 0.33 to 5.06 emu/g. When PLA is transformed into composites, the mean thickness of composites has decreased and water contact angle of composites has increased due to heavy and hydrophobicity Fe 3 O 4 . After addition of Fe 3 O 4 particles, the 50 k, 100 k and 200 k PLA’s crystallization rate is severally increased to 1.84, 1.56 and 1.44 times. It is concluded that the Fe 3 O 4 particles are the efficient crystallization nucleating agent of PLA and faster accelerate the crystallization of low molecular weight PLA in comparison with high molecular weight PLA. The melting points of Fe 3 O 4 /PLA composites slightly have decreased compared with the neat PLA, which is in accord with the melting point of the mixture that is lower than that of the pure substance. By introducing 5 mass% of Fe 3 O 4 particles to PLA, the initial decomposition temperatures reached to higher temperatures as compared to the neat PLA, and the final char yield is about 4.60%. The well dispersion of the particles in the PLA matrix is thought to be an effective barrier to the permeation of heat, which would improve the thermal stability.
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高影响因子
Polymer Crystallization
·
2021
·Vol. 4
·期 4
·e10196
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IF 0
Fan Liu,Chen Mao,Shou'ang Wu,Bocheng Wang,Chonggang Wu,Tao Hu,Xinghou Gong
Poly (ε-caprolactone) (PCL)/Fe 3 O 4 nanocomposites were prepared via solvent casting method. Microstructure, composition, and crystal structure of the nanocomposite were characterized by transmission electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction, respectively. The effects of the content of nano-Fe 3 O 4 on PCL matrix non-isothermal and isothermal crystallization behavior were analyzed by differential scanning calorimeter and polarizing microscopy, respectively, and, the thermal stability of nanocomposites was tested by using thermogravimetric analyzer. The results revealed that Fe 3 O 4 nanoparticles could be dispersed uniformly in PCL matrix. Crystal structure of the polymer matrix was not changed and a handful of nanoparticles has obvious nucleation effect, while excessive particles hindered the crystallization of PCL matrix. However, the thermal decomposition stability of nanocomposites decreased by the addition of Fe 3 O 4 particles.
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CLAYS AND CLAY MINERALS
·
2019
·Vol. 67
·期 4
·275-282
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IF 1.835
Liu Xiaonan,Zhang Youkui,Bian Liang,Li Jinshan
The adsorption of bovine serum albumin (BSA) protein is important for protein research but remains a great challenge. Here, the hydrothermal method and calcination in a hydrogen-argon mixed atmosphere were used to obtain ordered mono-crystalline magnetic Fe 3 O 4 nanorings with controllable size and uniform structure, which were applied to the adsorption of BSA protein. The results showed that the magnetic Fe 3 O 4 nanorings prepared have the advantages of good crystallinity, controllable morphology, and excellent magnetic response. The Fe 3 O 4 nanorings had an outer diameter of ~160–180 nm, inner diameter of ~80–110 nm, and height of 70 to ~110 nm. The amount of BSA adsorbed by magnetic Fe 3 O 4 nanorings increased with increasing protein concentration; when the concentration of BSA was ~2.75 mg·mL -1 the adsorption amount approached saturation. When the pH value of the solution was ~5, the Fe 3 O 4 nanorings absorption of BSA was greatest. With increasing adsorption time, the amount adsorbed increased gradually. Adsorption equilibrium was reached after 3 h. According to the formula, the saturated adsorption capacity of BSA per gram of magnetic Fe 3 O 4 nanorings was 325.2 mg.
.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 15
·48546
·
IF 2.188
Lei Yang,Qi Fu,Heqing Fu
Magnetic Fe 3 O 4 /waterborne polyurethane nanocomposites were synthesized based on waterborne polyurethane (WPU) and amino-functionalized Fe 3 O 4 by in situ polymerization. The Fe 3 O 4 nanoparticle was found to be uniformly distributed in Fe 3 O 4 /WPU nanocomposites with linear or crosslinked structure. In addition, the formation mechanism and magnetic conduction mechanism of stable inorganic–organic nanocomposites were discussed. The experimental results showed that the thermal stability, magnetic, and mechanical properties of magnetic Fe 3 O 4 /waterborne polyurethane nanocomposites were improved by amino functionalized Fe 3 O 4 . Furthermore, the defoaming property of the emulsion and the hydrophobic property of magnetic Fe 3 O 4 /waterborne polyurethane nanocomposites were improved by the 1-hexadecanol-terminated prepolymer. What more, polycaprolactone (PCL)-based Fe 3 O 4 /WPU nanocomposites have excellent mechanical properties (The tensile strength is over 30 MPa, the elongation rate is above 300%.) and magnetic properties. Magnetic Fe 3 O 4 /waterborne polyurethane nanocomposites will be used in the field of hydrophobic and microwave absorbent materials. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48546.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Peng He,Qing-Qing Zhou,Hao Wang,Yang Hu,Yong Li,Wen-Qi Yan,Feng Tao,Xie-Yang Qian,Feng Wang,Qi Liu,Guo-Bing Mao,Waqar Younas,Zhi-Ling Hou
The construction of lightweight magnetic electromagnetic (EM) wave absorption materials is of great significance for the development of EM wave absorption materials. Herein, hollow magnetic Fe 3 O 4 (H–Fe 3 O 4 ) nanospheres were successfully prepared by hydrothermal method . Analysis of EM parameters indicates that the formation of local conductive and magnetic networks caused by H–Fe 3 O 4 aggregation effects leads to the significantly enhancement of permittivity and permeability. In particular, the H–Fe 3 O 4 composite with a thickness of 2.15 mm achieved the minimum reflection loss of −50.25 dB and the corresponding bandwidth (<−10 dB) was 3.4 GHz. The synergistic effects of ferromagnetic resonance and exchange resonance and polarizations leads to excellent absorption performance. The radar cross section (RCS) simulation indicated that the RCS reduction value of H–Fe 3 O 4 composite can reach 29.8 dB m 2 under the incident angle of 20°. Moreover, the metastructure design shows an ultra-wide EM wave absorption bandwidth. This work can provide ideas for the design and application of ultra-light magnetic materials.
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DOI
高影响因子
Micro & Nano Letters
·
2018
·Vol. 13
·期 11
·1556-1559
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IF 0.841
Lihui Yao,Yajuan Wang,Ya Li,Jingkuan Duan
Different Fe 3 O 4 particles are synthesised with silane and carboxylic acid, surface modified by co-precipitation, and subsequently are characterised by Fourier transform infrared spectroscopy, wide-angle X-ray diffraction, laser particle size analyser (LPSA) and thermogravimetric analyser (TG). Based on the LPSA results, Fe 3 O 4 particles are micrometre size due to the experimental condition and modifiers. It is therefore suggested that the vacuum freeze-drying and the long-chain modifiers tend to obtain small size particles. The modifiers density on the surface of Fe 3 O 4 particles is obtained by TG and formula calculation. It is shown that the silane coupling agent is more effective modifier for Fe 3 O 4 particles compared with carboxylic acid. In accordance with the molecular structure and functional group number of carboxylic acids, different carboxylic acids have different modifiers density.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2012
·
IF 2.105
Jing Liu,Lu Wang,Jing Wang,Lantong Zhang
A new solvothermal method is proposed for the preparation of Fe 3 O 4 nanoparticles (NPs) from iron acetylacetonate in the presence of oleylamine and n- hexane. The products are characterized by X-ray powder diffraction, infrared (IR) spectroscopy, transmission electron microscopy, thermogravimetry/differential thermogravimetry (TG/DTG) analysis, and vibrating sample magnetometery. The new procedure yields superparamagnetic monodispersed Fe 3 O 4 particles with sizes ranging from 7 nm to 12 nm. The nanocrystal sizes are controlled by adjusting the volume ratio of oleylamine to n- hexane. IR and TG/DTG analyses indicate that the oleylamine molecules, as stabilizers, are adsorbed on the surface of Fe 3 O 4 NPs as bilayer adsorption models. The surface adsorption quantities of oleylamine on 7.5 and 10.4 nm-diameter Fe 3 O 4 NPs are 18% and 11%, respectively. The hydrophobic surface of the obtained nanocrystals is passivated by adsorbed organic solvent molecules. These molecules provide stability against agglomeration, enable solubility in nonpolar solvents, and allow the formation of magnetic polymer micelles.
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高影响因子
Nano-Micro Letters
·
2014
·Vol. 6
·期 3
·258-267
·
IF 2.275
Yu Lili,Wu Hui,Wu Beina,Wang Ziyi,Cao Hongmei,Fu Congying,Jia Nengqin
An electrochemical biosensing platform was developed based on glucose oxidase (GOx)/Fe 3 O 4 - reduced graphene oxide (Fe 3 O 4 -RGO) nanosheets loaded on the magnetic glassy carbon electrode (MGCE). With the advantages of the magnetism, conductivity and biocompatibility of the Fe 3 O 4 -RGO nanosheets, the nanocomposites could be facilely adhered to the electrode surface by magnetically controllable assembling and beneficial to achieve the direct redox reactions and electrocatalytic behaviors of GOx immobilized into the nanocomposites. The biosensor exhibited good electrocatalytic activity, high sensitivity and stability. The current response is linear over glucose concentration ranging from 0.05 to 1.5 mM with a low detection limit of 0.15 μM. Meanwhile, validation of the applicability of the biosensor was carried out by determining glucose in serum samples. The proposed protocol is simple, inexpensive and convenient, which shows great potential in biosensing application.
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高影响因子
危险品化学品经营许可证（带存储）