APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Qiancheng Zhang,Zuojuan Du,Xiaozhong Huang,Zixiang Zhao,Tong Guo,Guanjie Zeng,Yantao Yu
Adjustable and high-performance microwave absorbing materials of three-dimensional (3D) reduced graphene oxide (RGO)@Fe 3 O 4 structure were realized with different compositions. 100 × 50 nm Fe 3 O 4 nanorods were anchored on both sides of RGO sheets uniformly which stop RGO sheets from re-stacking. Effective absorption bands shifted to higher frequencies and thinner thicknesses in 2–18 GHz due to the precisely controlled complex permittivity caused by the decreased content of RGO. The maximum reflection loss of RGO@Fe 3 O 4 composites was up to −56.25 dB at 12.62 GHz with a small thickness of 2.0 mm, and the absorption bandwidth below −10 dB was 5.40 GHz with only 20 wt% filler loading in the paraffin matrix. The dielectric loss was a primary factor in the superior absorption performance resulting from dipolar polarization, interfacial polarization and associated relaxation phenomena. Hence, the appropriate composition of the RGO@Fe 3 O 4 structure can consider both the microwave absorptivity and the absorption adjustability. This method can be apply to other graphene-based magnetic microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2014
·
IF 2.354
Yaohui Xu,Yang Zhou,Ruixing Li
An available route was provided for simultaneous detection and effective adsorption toward Cd 2+ , Zn 2+ and Cu 2+ . The magnetic Fe 3 O 4 @SiO 2 nanoparticles were prepared and functionalized with N-(quinoline-8-yl)-2-(3-triethoxysilyl-propylamino)-acetamide (QTPA) by first using the “grafting from” method, which made the whole process of surface modification on Fe 3 O 4 @SiO 2 nanoparticles simpler and more effective. The as-synthesized QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles exhibited different fluorescence responses for Cd 2+ (doderblue), Zn 2+ (deepskyblue) and Cu 2+ (tomato red) illuminated under a 365 nm UV light, while other ions, such as Ag + , Hg 2+ , Ni 2+ , Co 2+ , Mn 2+ , Pb 2+ , Cr 3+ and Fe 3+ , gave no visible changes under identical experimental conditions. The eye-perceived fluorescent changes only toward Cd 2+ , Zn 2+ and Cu 2+ could serve as the available proofs for the qualitative analysis of the three cations. The UV–vis spectra results showed that the multifunctional nanoparticles exhibited fluorescence enhancements for Cd 2+ and Zn 2+ , and fluorescence quenching for Cu 2+ . The adsorption experiments showed that the nanomaterial was a good candidate for selective removal and enrichment of Cd 2+ , Zn 2+ and Cu 2+ , and had the high adsorption efficiency toward Cd 2+ (95.29%), Zn 2+ (92.37%), and Cu 2+ (91.06%). Moreover, the functionalized composites had strong magnetic sensitivity, which could make them susceptible in an external magnetic field, and easy to separate from the solid and liquid phase. More specific to this work, simultaneous fluorescence determination of Cd 2+ , Cu 2+ , and Zn 2+ by naked eye was proposed based on QTPA functionalized Fe 3 O 4 @SiO 2 nanoparticles.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2024
·Vol. 11
·期 1
·016301
·
IF 1.8
Lei Li,Long Ma,Xin Guo,Xiaoming Li,Tiejun Liu
In order to solve the problems of low cathode conductivity, shuttle effect, and poor electrochemical performance of Li-S batteries, we designed a porous carbon/nano-sized ferric oxide (Fe3O4) composite modified membrane. This improved both conductivity and adsorption capacity of lithium polysulfides (LiPSs) prepared with mesopores and high specific surface area C-Fe3O4@PE. The membrane can bind polysulfide via chemical and physical adsorption. Owing to these advantages, a Li-S battery based on C-Fe3O4@PE and with a separator exhibited excellent rate performance (965.9 mA h g–1 at 0.2 C and 437.5 mA h g–1 at 5 C), as well as a long cycle life (416.6 mA h g–1 after 300 cycles at 0.5 C, with a capacity retention rate of 50.5%).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Hengdong Ren,Sheng Wang,Wei Lian,Jialin Ma,Yan Zhao,Yin Liu,Ling Bing Kong,Tian shu Zhang,Won-Chun Oh
Palygorskite (Pal) was used as frameworks to disperse Fe 3 O 4 and polyaniline (PANI) nanoparticles for the preparation of coral-like Pal-dispersed Fe 3 O 4 /PANI composites with improved electromagnetic absorption performance. The processing was a combination of hydrothermal synthesis and simple mechanical stirring. With increasing content of Pal, specific surface area of the Pal-dispersed Fe 3 O 4 /PANI composites was increased from 21.14 m 2 /g to 29.69 m 2 /g, while the composites exhibitd fluffy coral-like structure due to the cation exchange mechanism and rich silanol (Si-OH) group of Pal. Since various loss mechanisms and improved impedance matching , the Pal-dispersed Fe 3 O 4 /PANI displayed an optimal reflection loss of −62.45 dB and a broad effective absorption bandwidth of 5.05 GHz. Therefore, this work develops an inexpensive framework to disperse nanoparticles for electromagnetic absorption materials , while new application of Pal is proposed.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Keduo Yan,Lan Xu,Adnan Ahmed
Due to the rapid development of information technology and the trend toward miniaturization of electronic equipment, the research on electromagnetic interference (EMI) shielding materials is rapidly moving toward low-dimensional, core–shell, and lightweight directions, with a wide range of application prospects in various fields. In this study, using pDA as a binder, poly(vinylidene difluoride) (PVDF)/Fe3O4@pDA@Ag nanofiber membranes (NFMs) with a multicore–shell structure were prepared by in situ growth of Ag nanoparticle (NP) layers on the fiber surface of electrospun PVDF/Fe3O4 NFMs fabricated in batch. Compared to PVDF@pDA@Ag NFM, the average EMI shielding efficiency (SE) of PVDF/Fe3O4@pDA@Ag NFM reached 82.31 dB because of the increased hysteresis and multireflection losses inside the NFM caused by the moderate addition of Fe3O4 NPs. In addition, the synergistic effect of Fe3O4 and Ag NPs increased the microwave attenuation and impedance matching of composite NFM, further enhancing its EMI SE.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2020
·
IF 3.408
Junjie Liao,Yujie Li,Zhenyu Wang,Longfei Lv,Liping Chang
Fe 3 O 4 has a broad application prospect in electrode materials of supercapacitors due to its high theoretical specific capacitance, low cost, and environmental friendliness. However, its easy agglomeration property and low charge/discharge cycle stability limit its further application. In order to overcome these issues, the preparation conditions for Fe 3 O 4 nanoparticles with high specific capacitance were optimized. Then the Fe 3 O 4 was used as the feedstock to prepare the Fe 3 O 4 /graphene nanocomposites using solvothermal method for the in-situ reduction of graphene oxide and the combination of Fe 3 O 4 nanoparticles with graphene. The Fe 3 O 4 nanoparticles, graphene oxides and Fe 3 O 4 /graphene nanocomposites were characterized by X-ray diffraction (XRD), N 2 adsorption, Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The capacitance and stability of these samples were obtained from charge/discharge curves and cyclic voltammograms. The results show that during preparation process, Fe 3+ ions could combine with the O-containing functional groups on the surface of graphene oxide to form Fe 3 O 4 nanoparticles, and the graphene oxide could be in-situ reduced to form graphene simultaneously. This could effectively prevent aggregation of Fe 3 O 4 and stacking of graphene as electrode materials. Moreover, the optimal conditions for preparing Fe 3 O 4 /graphene nanocomposites (BF24G60) are 60% of graphene theoretical percentage in Fe 3 O 4 /graphene nanocomposites, 205 °C of preparation temperature, and 24 h of reaction time. For the BF24G60 sample, it has excellent cycle stability (93% after 500 cycles) and specific capacitance (300 F/g at 0.4 A/g), which is higher than that of the single graphene (77 F/g) and Fe 3 O 4 nanoparticles (222 F/g).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2013
·Vol. 16
·期 4
·609-615
·
IF 3.879
Wei Lü,Yao Wu,Jie Chen,Yue Yang
A facile and fast one-pot method was developed to synthesize a magnetic graphene–Fe3O4 nanocomposite (G–Fe3O4) at low reaction temperature. The synthesized nanocomposite was characterized by transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The Fe3O4 nanoparticles with average sizes of 24 nm were formed uniformly on graphene sheets. The as-prepared nanocomposite was used as an adsorbent to remove dye from wastewater using the organic dye rhodamine B as the adsorbate. The G–Fe3O4 nanocomposite shows excellent ability to extract organic pollutants and can be easily manipulated in a magnetic field for separation. The results suggest that G–Fe3O4 nanocomposites have great potential to remove organic dyes from wastewater.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 3
·1329-1337
·
IF 1.137
Zeng Dejun,Dai Ying,Zhang Zhibing,Wang Youqun,Cao Xiaohong,Liu Yunhai
In this work, the magnetic hydroxyapatite composite (Fe 3 O 4 @HAP) was prepared and used to remove of U(VI). The characterizations of transmission electron microscope and vibrating sample magnetometer indicated that the average size and saturation magnetizations ( M s ) of Fe 3 O 4 @HAP was about 360 nm and 20.89 emu g −1 , respectively. The results of solid-phase extraction indicated that at pH 5.0, the removal efficiency of Fe 3 O 4 @HAP was more than 95% within 20 min. The maximum adsorption capacity ( q m ) of Fe 3 O 4 @HAP was 789.58 mg g −1 . Therefore, Fe 3 O 4 @HAP may be a rapid and highly efficient magnetic adsorbent to remove of U(VI) from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2021
·
IF 5.263
Yanghao Pu,Zhengfeng Xie,Xingyu Gong,Yuru Yan,Jun Zhang
Design and fabrication of structurally optimized absorbents are important for wastewater treatment such as dyes removal. Herein, modifying the environmentally harmful waste polystyrene foam as an efficient recyclable adsorbent for organic dyes is important Magnetic amidated modified polystyrene (Fe 3 O 4 /PS-SD) was prepared by Friedel–Crafts reaction, N,N”-dicyclohexylcarbodiimide (DCC) dehydration condensation, and chemical co-precipitation reaction. Fe 3 O 4 /PS-SD had highly efficient removing performance for organic dyes in large volume of water sample solutions, and the equilibrium was achieved in 0.5 h. The maximum adsorption capacity for Methylene blue (MB), Safranine T (ST), and Congo red (CR) were 620.32 mg g −1 , 679.63 mg g −1 , and 1425.77 mg g −1 , respectively, at room temperature according to the Langmuir adsorption isotherm (R 2 > 0.91). The kinetic data of the three dyes followed pseudo-second-order kinetics. After ten regeneration cycles, the removal rate remained high (> 80%). Experimental results showed that Fe 3 O 4 /PS-SD was an excellent adsorbent for water treatment with high regeneration property and thermal stability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Xiaolei Song,Congzhu Xu,Yuyan Wang,Huizhen Ke,Yonggui Li,Qufu Wei,Xinqun Feng
High magnetic protective fabrics with rare earth Nd doped Fe 3 O 4 nanoparticles were fabricated via a grafting method. The structure, crystal form, and elemental composition of nanoparticles were investigated by transmission electron microscopy, energy dispersive X-ray, X-ray powder diffraction, and X-ray photoelectron spectroscopy. The obtained NdFe 2 O 4 nanoparticles show spherical shape with fine dispersion and reasonable element composition. However, they demonstrate fine superparamagnetic properties with a magnetic saturation value of 29.25 A m 2 /g and low coercivity of 1.902 mT through the vibrating sample magnetometry technique, which can be well developed in magnetic shielding protective applications. Then, the cotton fabrics with plain weave were finished by a proofing rapier loom as a carrier. The NdFe 2 O 4 nanoparticles underwent some appropriate surface modification and then were grafted onto the cotton fabrics by a bridge agent of N , N ′-dissuccinimidyl carbonate. The morphology, structure, dispersion effect, and electromagnetic protective properties of the fabrics were observed through scanning electron microscopy, Fourier infrared spectroscopy, thermogravimetric analysis-differential scanning calorimetry (TG-DSC), and a vector network analyzer. The reliable fabrics with grafting reaction on the interface are expected to have potential applications in the field of electromagnetic protection and biomedicine fields.
研究领域:
材料科学
·
电磁学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-13
·
IF 10.435
Chen Tong,Chu Qiang,Li Mengyang,Han Gaorong,Li Xiang
Electrodynamic therapy (EDT) has recently emerged as a potential external field responsive approach for tumor treatment. While it presents a number of clear superiorities, EDT inherits the intrinsic challenges of current reactive oxygen species (ROS) based therapeutic treatments owing to the complex tumor microenvironment, including glutathione (GSH) overexpression, acidity and others. Herein for the first time, iron oxide nanoparticles are decorated using platinum nanocrystals (Fe 3 O 4 @Pt NPs) to integrate the current EDT with chemodynamic phenomenon and GSH depletion. Fe 3 O 4 @Pt NPs can effectively induce ROS generation based on the catalytic reaction on the surface of Pt nanoparticles triggered by electric field (E), and meanwhile it may catalyze intracellular H 2 O 2 into ROS via Fenton reaction. In addition, Fe 3+ ions released from Fe 3 O 4 @Pt NPs under the acidic condition in tumor cells consume GSH in a rapid fashion, inhibiting ROS clearance to enhance its antitumor efficacy. As a result, considerable in vitro and in vivo tumor inhibition phenomena are observed. This study has demonstrated an alternative concept of combinational therapeutic modality with superior efficacy.
研究领域:
肿瘤学
·
纳米医学
·
生物材料学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
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.
研究领域:
材料科学
·
纳米技术
·
化学工程
·
磁性材料
✓ 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）