RSC Advances
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2019
·Vol. 9
·期 2
·878-883
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IF 3.049
Fangke Zhan,Ran Wang,Juanjuan Yin,Zengsheng Han,Lun Zhang,Tifeng Jiao,Jingxin Zhou,Lexin Zhang,Qiuming Peng
Functional nanocomposites demonstrate excellent comprehensive properties and outstanding characteristics for numerous applications. Magnetic nanocomposites are an important type of composite materials, due to their applications in optics, medicine and catalysis. In this report, a new Fe3O4-loaded silver (Fe3O4–Ag) nanocomposite has been successfully synthesized via a simple solvothermal method and in situ growth of silver nanowires. The silver nanowires were prepared via the reduction of silver vanadate with the addition of uniformly dispersed Fe3O4 nanoparticles. Structural and morphological characterizations of the obtained Fe3O4–Ag nanocomposite were carried out using many characterization methods. As a new composite catalyst, the synthesized magnetic Fe3O4–Ag nanocomposite displayed a high utilization rate of catalytically active sites in catalytic reaction medium and showed good separation and recovery using an external magnetic field. The facile preparation and good catalytic performance of this Fe3O4–Ag nanocomposite material demonstrate its potential applications in catalytic treatment and composite materials.
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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.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Qingui Yang,Na Li,Qiang Li,Shaoqing Chen,Hsing-Lin Wang,Haipeng Yang
Sarcosine is a recently identified biomarker for prostate cancer. However, the rapid detection methods for sarcosine are relatively lack because of the low concentration and the presence of complicated interfering substances in serum or urine. In this manuscript, hollow nanospheres of Fe 3 O 4 was synthesized and used as carrier to disperse Pt (Pt) nanoparticles . In order to achieve excellent electron transfer ability, we use polyaniline to coat Pt–Fe 3 O 4 nanoparticles, and pyrolyze the polyaniline to carbon (C). Thus, hollow magnetic Pt–Fe 3 O 4 @C nanocomposites with good electron transfer ability are formed. The Pt–Fe 3 O 4 @C nanocomposites have high catalytic activity and stability. The nanocomposites were immobilized on glassy carbon electrode (GCE) to construct a nonenzyme hydrogen peroxide (H 2 O 2 ) sensor (Pt–Fe 3 O 4 @C/GCE). We further construct a sensitive sarcosine biosensor by immobilizing sarcosine oxidase (SOx) on the Pt–Fe 3 O 4 @C/GCE. The high catalytic activity and good biocompatibility of Pt–Fe 3 O 4 @C nanocomposites greatly retained the bioactivity of immobilized SOx, and the prepared sarcosine biosensor has good electrocatalytic performance towards sarcosine. It has a linear detection range between 0.5 and 60 μM with a limit of detection (LOD) of 0.43 μM (the signal to noise ratio is 3), and the sensitivity is 3.45 nA μM −1 (48.8 nA μM −1 cm −2 ), which has the potential to be used for rapid screening of prostate cancer.
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ENERGY CONVERSION AND MANAGEMENT
·
2018
·
IF 6.377
Lei Shi,Yurong He,Xinzhi Wang,Yanwei Hu
In recent years, nanoscale particles have been applied in the utilisation of solar energy due to their excellent properties. In light of the multiple functions of composite nanoparticles, some solar-assisted systems have been developed and exhibited comprehensive photoelectric and photo-thermal transformation effects. However, the presence of nanoparticles in these systems can cause secondary pollution and severely limit large-scale application of the solar technology. Herein we developed a recyclable photo-thermal conversion and purification system based on Fe 3 O 4 nanoparticles decorated with TiO 2 nanoparticles, which could be separated from water under the action of a magnetic force. Under the solar illumination power of 1 sun (1 sun = 1000 W·m −2 ), thermal receiver efficiency of 76.4% and Rhodamine B degradation efficiency of 85% were obtained with a 0.1 g/L Fe 3 O 4 @TiO 2 nanofluid. With the increase of the solar illumination power, the degradation efficiency has been increased to 94%. The recovery rate and efficiency could be controlled by adjusting the magnetic field strength and the magnetic property of Fe 3 O 4 @TiO 2 nanoparticles. This study provides an approach to not only significantly reduce material consumption in the design of solar devices, but also to realise broad solar energy applications for water purification and photo-thermal conversion.
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INTEGRATED FERROELECTRICS
·
2018
·
IF 0.367
Xiaolei Song,Yuan Yu,Chunxia Wang,Mingqiao Ge
Magnetic nanoparticles of Nd-Fe3O4 were prepared by hydrothermal synthesis method, using NdCl3·6H2O and FeCl3·6H2O as the starting materials in this paper. The structure and morphology of nanoparticles were investigated by XRD, FTIR, EDS and TEM. The results showed that, while the addition of Nd at 10% in mole ratio, resulted in the formation of Nd2O3 crystal peak in cubic Fe3O4 nanocrystallites by XRD. The absorption bands of Fe‒O, ‒OH, ‒O‒C‒O‒ and ‒CH2‒ were accordant to the correspondent chemical groups by FTIR. The morphology of the prepared nanoparticles exhibited spherical structure and evenly distributed without agglomeration phenomenon by TEM. The elemental composition were mainly consistent with the precursor materials used in the experiment.
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Particuology
·
2019
·
IF 2.616
Lei Shi,Yurong He,Yanwei Hu,Xinzhi Wang,Baocheng Jiang,Yimin Huang
Size-controlled hollow Fe 3 O 4 nanospheres were synthesized via a one-pot hydrothermal method as a function of reaction time and sodium citrate, polyacrylamide, and urea content. Multiple characterization techniques such as scanning and transmission electron microscopy and Raman spectroscopy were employed to investigate the crystal structure and morphology of the obtained nanospheres. The Fe 3 O 4 nanosphere formation mechanism was elucidated from analyzing the characterization data. High levels of sodium citrate and longer reaction times were observed to increase the diameter of the nanospheres until hollow structures formed. Furthermore, polyacrylamide and urea promoted the formation of hollow structures. The hollow-structured Fe 3 O 4 nanospheres exhibited high magnetization saturation values in the range of 48.8–58.7 emu/g. The facile synthesis method described herein, to generate size-controlled Fe 3 O 4 nanospheres with tailored properties, demonstrates potential across a wide range of fields from drug-delivery and stealth devices, to environmental and energy applications.
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IONICS
·
2017
·Vol. 24
·期 9
·2697-2704
·
IF 2.062
Li Yanfei,Yu Jie,Chen Shouhui,Huang Zhenzhong,Wang Li
In this work, the commercial carbon paper was firstly peeled in K 2 CO 3 solution and then was further treated in a KNO 3 solution to form functional exfoliation graphene (FEG) on the commercial carbon paper. The FEG/carbon paper was characterized by Raman spectra and scanning electron microscopy, confirming that some typical layered fold graphenes were successfully peeled off and stood on the carbon paper matrix. Then, Fe 3 O 4 nanoparticles (NPs) were grown on the surface of FEG/carbon paper and the as-prepared Fe 3 O 4 NPs/FEG/carbon paper was directly used as supercapacitor electrode. The specific capacitance of Fe 3 O 4 NPs/FEG/carbon paper was about 316.07 F g −1 at a current density of 1 A g −1 . Furthermore, the FEG/carbon papers were also functionalized by benzene carboxylic acid to form FFEG/carbon papers, and then the Fe 3 O 4 NPs were grown on the surface of FFEG/carbon paper. The specific capacitance of Fe 3 O 4 NPs/FFEG/carbon paper was 470 F g −1 at a current density of 1 A g −1 , superior to some previous reported results. This work might provide a new strategy to prepare various nanostructures on FFEG/carbon papers for future applications.
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Materials
·
2017
·Vol. 10
·期 11
·1239
·
IF 2.654
Bing Yu,Liang He,Yifan Wang,Hailin Cong
Magnetic porous microspheres are widely used in modern wastewater treatment technology due to their simple and quick dye adsorption and separation functions. In this article, we prepared porous polymethylmethacrylate (PMMA) microspheres by the seed-swelling method, followed by in situ formation of iron oxide (Fe3O4) nanoparticles within the pore. Then, we used diazo-resin (DR) to encapsulate the porous magnetic microspheres and achieve PMMA@Fe3O4@DR magnetic material. We studied the different properties of magnetic microspheres by different dye adsorption experiments before and after the encapsulation and demonstrated that the PMMA@Fe3O4@DR microspheres can be successfully used as a reusable absorbent for fast and easy removal of anionic and aromatic dyes from wastewater and can maintain excellent magnetic and adsorption properties in harsh environments.Keywords:poly (methylmethacrylate) (PMMA);magnetic;diazo-resin (DR);adsorption;dye
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiuling Chen,Tian Gao,Ying Ren,Changjiang Xiao
The demand for high-performance electromagnetic wave absorbent materials continues to grow with advancing technology. This study reports the synthesis of Bi 2 Fe 4 O 9 /Fe 3 O 4 nanoflower to enhance electromagnetic wave absorption. Bi 2 Fe 4 O 9 , synthesized via a hydrothermal method, was composited with different content Fe 3 O 4 nanocrystals. The strong binding between sheets of nanoflowers provides large surface area and active sites for electromagnetic wave absorption (EMA). The combination of Bi 2 Fe 4 O 9 and Fe 3 O 4 markedly enhanced the dielectric and magnetic properties, resulting in exceptional EMA performance. The sample achieved a minimum reflection loss (RL min ) of −75 dB at 7.0 GHz with a thickness of just 2.5 mm, along with a maximum effective absorption bandwidth (EABW) of 9.2 GHz. The broadband and strong absorption on electromagnetic wave is attributed to the synergistic effects of ferroelectric properties from Bi 2 Fe 4 O 9 and spinel structure of Fe 3 O 4 , supported by strong dipole coupling, interfacial polarization, and high-spin states of Fe ions. The underlying mechanism is thoroughly discussed, and the results demonstrate superior performance compared to similar studies in the field.
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NANOTECHNOLOGY
·
2024
·Vol. 35
·期 46
·465601
·
IF 2.9
Wei Yang,Site Luo,Yang He,Han Wang,Haihu Yu
Amorphous arrays assembled from colloidal microspheres are a way that obtains angle-independent structural colors. In order to obtain additional properties, colloidal microspheres, which are constituent units, can be modified with other materials. Here, we utilized the silane-functionalized carbon quantum dots (SiCDs) by incorporating them into the Stöber reaction to fabricate Fe3O4@SiO2/SiCDs nanospheres with a core–shell structure. Amorphous colloidal arrays (ACAs) were constructed on commercial printing paper using Fe3O4@SiO2/SiCDs nanoparticles as structural units by a simple permeation assembly. Macroscopically, the prepared ACAs exhibit the magnetic properties of Fe3O4, while under sunlight, they display bright, angle-independent structural colors. Under ultraviolet light, the array shows significant fluorescence. This enables the presentation of multidimensional information under varying magnetic and lighting conditions. By adjusting the thickness of the outer SiO2/SiCDs composite layer, the optical properties and magnetism can be controlled easily. Moreover, due to the strong light absorption capability and high refractive index of Fe3O4, the digital patterns constructed with Fe3O4@SiO2/SiCDs nanospheres demonstrate excellent multi-level anti-counterfeiting characteristics, even under water exposure. The magnetic properties of Fe3O4@SiO2/SiCDs nanospheres, along with their distinct display characteristics under different optical environments, suggest their wide applicability in the fields of multifunctional anti-counterfeiting pigments, bioimaging, and sensing displays.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Longxin Wang,Yishan Wang,Dongdong Liu,Yao Wang,Xuji Zhang,Guangwu Wen,Xueqian Zhang,Xiaoxiao Huang
The application of heterostructures and complex morphology has been favored by researchers of electromagnetic wave-absorbing materials. Herein, Fe3O4/Fe2O3/C composites with carbon-coated octahedral structures were prepared and obtained using a polymer self-assembly-guided nonhomogeneous structure engineering strategy to form hierarchical polyhedral structures (200–400 nm in size). The electrostatic attraction of anionic polyacrylamide (APAM) is used to chelate Fe3+. Due to the synergistic effect of intermolecular forces, APAM can be used as a “bridge” to connect multiple micellar particles, and this bridging and entanglement effect facilitates the formation of octahedral Fe3O4/Fe2O3. Compared with nanoparticles, the octahedral structure easily forms a conductive network, and the presence of sharp corners can effectively promote the concentration of charge, promote polarization loss, and extend the reflection and scattering path. Through the high-temperature reduction of APAM, the conversion of part of Fe2O3 to Fe3O4 is realized, which effectively improves the electromagnetic parameters and thus optimizes the impedance matching. Meanwhile, the synergistic effect between the magnetic loss (ferromagnetic resonance) of Fe3O4 and the dielectric loss (interfacial polarization, dipole polarization, and conduction loss) of Fe3O4/Fe2O3/C enhances the absorption of electromagnetic waves. Unsurprisingly, the synthesized Fe3O4/Fe2O3/C composites exhibit excellent EMW absorption performance, with a reflection loss of up to −34.7 dB at 30% paraffin filler ratio and an effective absorption bandwidth (EAB) of 8.64 GHz at 1–3 mm.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Zebo Wu,Dan Liu,Wenhao Wang,Hongtong Xie,Xianghui Chen,Huibin Yin
Magnetized wood (M–W) has been proposed to be used as an absorber in solar-driven interfacial evaporation. The M−W could gain an evaporation rate of 1.46 kg m −2 h −1 under the combined effect of sunlight and magnetic fields, which is 27 % higher than carbonized wood (C–W). To explore the mechanism, they were subjected to SEM, XPS, and water contact angle tests. It is revealing that M−W forms much more microchannels for steam diffusion. The M−W shows 97 % optical absorption within the whole wavelength, while the C–W is lower than 85 %, revealing the M−W can gather most of the solar radiation. Finally, the permeability coefficients of carbonized and magnetized woods are calculated by the CFD model. The permeability coefficient of the M−W is 20 % higher than the C–W, which can be attributed to Fe 3 O 4 nanoparticles disturbing the steam growth in the magnetic field, hence decreasing the thickness of the liquid film covering the bubbles and improving the solar evaporation rate.
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危险品化学品经营许可证（带存储）