SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
·
IF 6.3
Yahui Wang,Xin Liu,Jian Tie,Jiexiong Ding,Peiyi Wang,Zipeng Jiang,Shengnian Tie,Changan Wang
As a crucial component in phase change heat storage systems, phase change materials have demonstrated remarkable application potential across diverse fields, such as solar energy storage systems, magnetic induction energy conversion, and storage. This research reports a high-performance photomagnetically driven composite phase change materials. The photomagnetic response unit was fabricated via the hydrothermal coprecipitation method by in-situ loading of Fe 3 O 4 nanoparticles onto carbon nanotubes (CNTs@Fe 3 O 4 ). Subsequently, it was integrated with the Na 2 SO 4 ·10H 2 O-Na 2 HPO 4 ·12H 2 O eutectic salt to synthesize the composite PCM heat storage material.Experimental findings indicate that the composite incorporating 2.5 % CNTs@Fe 3 O 4 exhibits nearly zero subcooling (ΔT = 0.1 °C), a thermal conductivity as high as 1.0230 W/(m·K), a significant latent heat of phase transformation (melting enthalpy of 253 J/g and solidification enthalpy of 218 J/g), and an enthalpy retention rate of 94.8 % after 1000 thermal cycles. The Fe 3 O 4 endows the material with excellent magneto-thermal conversion performance. Specifically, at a 2.5 % doping content, the temperature increase within 240 s in an alternating magnetic field can reach 67.2 °C through the Néel/Brownian relaxation mechanism. Additionally, the CNTs carrier enhances the photothermal conversion efficiency to 94.5 %. This material combines high thermal conductivity, cycle stability, and dual-field (optical/magnetic) driven heat storage capabilities, thus demonstrating significant application potential in multifunctional thermal energy storage.
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高影响因子
ACS Applied Nano Materials
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2025
·
IF 5.5
Xi Huang,Xiaolan Liang,Chunzhi Zhang,Yunhua Chen,Chaoyang Wang,Li Zhou,Tao Wang,Chunlin Feng,Hongxia Liu
The rise of the Internet of Things highlights the need for wearable piezoresistive sensors capable of integrating sensing devices with broader applicability and more advanced sensing functionalities. However, the development of multifunctional hydrogel sensors that meet the diverse needs of practical applications continues to present a substantial challenge. In this study, N-isopropylacrylamide/MXene/Fe3O4 (PNMF) composite hydrogels were synthesized via a straightforward one-pot method. The PNMF-based sensor exhibits multimode sensing abilities for pressure, magnetic, and temperature, with MXene and Fe3O4 nanoparticle providing electrical and magnetic response properties. Importantly, the temperature response is controlled by adjusting the MXene nanosheet content, which modifies the lower critical solution temperature (LCST) of the PNMF composite hydrogels. The PNM2F2-based pressure/magnetic/temperature sensor shows sensitivities of 0.40 and 0.23 kPa–1 in the 0–390 and 390–1040 Pa ranges, respectively. In the magnetic field ranges of 0–1.61, 1.61–4.25, and 4.25–40.93 mT, the field sensitivities are 26.93, 4.54, and 0.36 T–1, respectively. The PNMF composite hydrogel, as a multimode sensor, not only detects real-time human joint movement through pressure sensing but also operates as both a magnetic and temperature control switch, enabling detection of magnetic field strength and body surface temperature. This demonstrates its multimode sensing capability in more complex scenarios.
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Royal Society Open Science
·
2024
·Vol. 11
·期 7
·
IF 2.9
Jia-yi Ye,Man-qing Ye,Ling Zhang,Wen Li,Yan-shan Li,Zhi-wei Fu
Nano-Fe3O4 was loaded onto coconut-based activated carbon fibres (CACF) using an electrostatic self-assembly method. The effects of the mass ratio of CACF to nano-Fe3O4, loading time, pH and temperature on the loading effect were investigated and ideal loading conditions were determined. To study the adsorption performance of MACF@Fe3O4 for methylene blue, the effects of the initial concentration, pH and time on the adsorption were investigated and the working conditions of adsorption were established. MACF@Fe3O4 was systematically characterized. Adsorption kinetics were investigated under ideal conditions. The ideal loading conditions for MACF@Fe3O4 were as follows: mass ratio of 1:1, 20 min, pH 9.36, 22.5°C. The saturation magnetization of MACF@Fe3O4 was 48.2263 emu·g−1, which could be quickly separated under an external magnetic field. When the dosage was 0.010 g, the adsorption rate reached 97.29% and the maximum adsorption capacity was 12.1616 mg·g−1. The adsorption process conformed to pseudo-first-order kinetics during the first 15 min and pseudo-second-order kinetics during 20–120 min. The equations were ln(Qe-Qt)=2.2394-0.0689t and tQt=0.0774 + 0.5295t, respectively. The isothermal adsorption model showed that MACF@Fe3O4 was more in line with the Langmuir model, indicating that the adsorption process was mainly monolayer adsorption. The thermodynamic analysis results showed that the adsorption process of MB by MACF@Fe3O4 was an endothermic process. In this study, MACF@Fe3O4 with high adsorption capacity and easy separation from coconut palm fibres has good application prospects in the field of adsorption, which can promote the high-value utilization of coconut palms.
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PubMed
高影响因子
Catalysts
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2025
·Vol. 15
·期 2
·175
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IF 4
Wei Wang,Jiaqi Liu,Guang Shi,Shiqi Wu,Shihan Zhang,Ruixia Yuan
A magnetic shell-structured nano-catalyst was prepared by self-polymerization of dopamine wrapped by ferric oxide as the carrier, which was loaded with palladium nanoparticles (Pd/PDA@Fe3O4). The presence of magnetic Fe3O4made it easy for nanoscale palladium particles to recover and prevent the loss of palladium nanoparticles that is unavoidable in traditional usage and preparation procedures. The catalyst was characterized by X-ray diffraction, fourier transform infrared spectroscopy, scanning electron microscopy, thermal weight loss analysis, Raman spectroscopy, X-ray photo-electron spectroscopy, and magnetic properties analysis. The catalytic performance of the prepared catalyst was investigated taking 4-nitrophenol (10 mg/L) and rhodamine B (15 mg/L) as the target pollutants. The results showed that under the conditions of 35 °C, pH = 7 and a catalyst dosage of 3 mg, the catalytic reduction efficiency of 4-nitrophenol, rhodamine B, and the mixture of them all can reach 99%. The catalytic efficiency of Pd/PDA@Fe3O4remained above 90% after being used 10 times. The shell structure of Fe3O4made it possible and easy to recover and recycle the nanoscale palladium, which was a real problem in the usage of nano-catalysts. At the same time, the problem of separation and recovery of palladium nano-catalyst is solved by magnetism, which provides research ideas for the recycling and utilization of nano-materials.
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JOURNAL OF CHROMATOGRAPHY A
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2024
·
IF 3.8
Yanbo Tian,Abdul Majid,Yuewei Zhang,Liju Tan,Huiru Li,Na Wang,Jiangtao Wang
In this study, molecularly imprinted polymers (MIPs) were prepared for the specific recognition of organophosphorus pesticides and a rapid, efficient and simple method was established for the detection of dimethoate (DIT) in food samples. Fe 3 O 4 magnetic nanoparticles were synthesized by co-precipitation, and Fe 3 O 4 /ZIF-8 complexes were prepared by a modified in-situ polymerization method, and then magnetic molecularly imprinted polymers (MMIPs) were prepared and synthetic route was optimized by applying density functional theory (DFT). The morphological characterization showed that the MMIPs were coarse porous spheres with an average particle size of 50 nm. The synthesized materials are highly selective for the organophosphorus pesticide dimethoate with an adsorption capacity of 461.50 mg·g −1 and are effective resistance to matrix effects. A novel method for the determination of DIT in cabbage was developed using the prepared MMIPs in combination with HPLC. The practical results showed that the method can meet the requirements for the determination of DIT in cabbage with recoveries of 85.6–121.1 % and detection limits of 0.033 μg·kg −1 .
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PubMed
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
·
IF 7.8
Yufen Kong,Hongdan Wu,Zhihui Zhou,Xianyuan Fan,Ming Li
To address the long-standing trade-off between flux and selectivity, as well as the structural instability of conventional nanofiltration (NF) membranes, this study proposes a novel intercalation strategy for constructing two-dimensional laminar NF membranes based on MXene for efficient dye/salt separation. Spherical Fe 3 O 4 nanoparticles were functionalized with amino groups using 3-aminopropyltriethoxysilane (APTES) to impart positive surface charges, and subsequently assembled onto hydrophilic MXene (Ti 3 C 2 T x ) nanosheets via electrostatic self-assembly, forming a structurally stable MXene/NH 2 -Fe 3 O 4 composite membrane. The surface functionalization of Fe 3 O 4 plays a critical role in regulating the interlayer structure of MXene, thereby enhancing membrane stability and selective transport performance. At a mass ratio of MXene to NH 2 -Fe 3 O 4 of 1:6, the membrane exhibited a pure water flux of 136.6 L/(m 2 ·h) and rejection rates of up to 99.9 % for Congo Red (CR) and Evans Blue (EB). In contrast, the rejection rates for NaCl, MgSO 4 , and Na 2 SO 4 were 7.0 %, 15.4 %, and 26.4 %, respectively. In mixed dye/salt systems, the membrane exhibited excellent selectivity, with separation factors of 839 for CR/NaCl, 704 for CR/MgSO 4 , and 566 for CR/Na 2 SO 4 , attributed to synergistic contributions of size exclusion, electrostatic repulsion, and the Donnan exclusion effect. Furthermore, the composite membrane demonstrated outstanding dye removal efficiency, acceptable salt rejection, and robust structural integrity under prolonged operation, wide pH variations, and challenging conditions involving organic foulants and surfactants, offering a practical strategy for developing advanced NF membranes for complex wastewater treatment.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Piyu Gong,Mengwen Hu,Yihao Zheng,Shuo Tao,Haibo Li,Suyuan Zeng,Lei Wang
In this paper, the ternary transition metal composite of Zn 5 Mo 2 O 11 ·5H 2 O@Fe 3 O 4 has been successfully designed and constructed. The structural characteristics of formed composites were characterized and elucidated. As one novel anode material, the electrochemical lithium storage mechanism of Zn 5 Mo 2 O 11 ·5H 2 O@Fe 3 O 4 composite was proposed. At the current densities of 2.0, 5.0 and 10.0 A g -1 , Zn 5 Mo 2 O 11 ·5H 2 O@Fe 3 O 4 delivered an excellent electrochemical stabilities and lithium storage capacities. The synergistic conductive effect enhances the electrochemical lithium storage performance of formed Zn 5 Mo 2 O 11 ·5H 2 O@Fe 3 O 4 composite, presents a broad promising prospect for the construction of transition metal molybdate composite based energy storage devices.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Xinyu Chen,Yingrui Nie,Wenqian Fan,Zhimin Zhao,Zhifei Wang,Yong Jiang
In this study, yolk-shell magnetic hydrogel microspheres loaded with silver nanoparticles (Fe 3 O 4 @P(DVB-co-MAA)@Ag) were innovatively constructed for efficient catalytic reduction of nitroaromatic compounds. First, hollow P(DVB-co-MAA) microspheres were prepared as shell. Fe 3 O 4 magnetic nanoparticles were successfully deposited into the microspheres as yolk through the decomposition of metal-organic precursor salts in high-temperature organic solvents. The EM images shows that Fe 3 O 4 @P(DVB-co-MAA) microspheres consist of a magnetic core, an intermediate void layer, and a hydrophilic hydrogel shell, demonstrating a unique multilayered structural feature. Then, highly active silver nanoparticles were uniformly loaded onto the hydrogel shell surface using the thermal co-reduction method. Catalytic results demonstrated that the yolk-shell material showed significantly enhanced activity toward the reduction of 4-nitrophenol (4-NP) and 2-nitroaniline (2-NA), compared to the core-shell structured composite microspheres. The catalytic parameters were 65.44 s⁻¹ g⁻¹ and 46.44 s⁻¹ g⁻¹ , respectively. Remarkably, the composite retained over 85 % catalytic efficiency after five cycles of use and achieved rapid magnetic separation within 20 s under an external magnetic field.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Liangui Guo,Hao Sun,Caiqin Qin,Wei Li,Feng Wang,Wulin Song,Jun Du,Fei Zhong,Yu Ding
The energy and power density of lithium-ion batteries (LIBs) can be effectively improved by designing flexible free-standing electrodes. Here, a flexible film composed of Fe 3 O 4 nanoparticles (NPs) embedded in N-doped carbon nanofibers (Fe 3 O 4 /NCNFs) was prepared through electrospinning and subsequent annealing process. The Fe 3 O 4 /NCNFs film can be directly used as anode materials for LIBs without conductive additive, current collector, and binder. Electrochemical measurement results indicate that the Fe 3 O 4 /NCNFs electrode exhibits excellent cycling stability and retains the capacity of 522 mAh g −1 after 200 cycles at 0.1 A g −1 . Furthermore, the Fe 3 O 4 /NCNFs electrode also shows good rate performance and still obtains a specific capacity of 407 mAh g −1 even at 5 A g −1 . The superior electrochemical performance should be attributed to the flexible self-standing characteristic of the electrode and the synergistic effects between 3D conductive NCNFs and Fe 3 O 4 NPs.
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JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 49
·期 20
·7181-7191
·
IF 2.305
Mu Bin,Zhang Wenbo,Wang Aiqin
A novel superparamagnetic gold/halloysite nanotubes/Fe 3 O 4 (Au/HNTs/Fe 3 O 4 ) nanocomposite with coaxial structure was designed and fabricated by selective decoration of the inner lumen and the external wall of halloysite nanotubes (HNTs) based on the difference inside/outside surface charges. The structure and composition of Au/HNTs/Fe 3 O 4 were characterized by transmission electron microscope, powder X-ray diffraction, and X-ray fluorescence. The results indicated that Au nanorods selectively generated within the lumen of HNTs, while Fe 3 O 4 nanoparticles uniformly deposited on the external wall. It was particularly worth mentioning that the structure of HNTs was not destroyed in the preparation process of Au/HNTs/Fe 3 O 4 nanocomposites. The catalytic activity of the as-prepared Au/HNTs/Fe 3 O 4 was investigated for the reduction of 4-nitrophenol in the presence of NaBH 4 . The Au/HNTs/Fe 3 O 4 nanocomposites exhibited excellent catalytic activity and cycling stability according to the kinetic data of the catalytic reduction reaction. In addition, the Au/HNTs/Fe 3 O 4 catalysts can be easily manipulated by an external magnetic field for recycling.
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY A
·
2020
·
IF 2.6
Lincheng Li,Yunlan Xu,Dengjie Zhong
Herein, we reported a simple solvothermal and chemical oxidation method to synthesize a magnetic core–shell composite (Fe3O4@UiO-66@PANI) for Cr(VI) removal from wastewater. Due to the porosity and stability of UiO-66 and stability, high acid resistance, and multiple active (reducing and chelating) groups of polyaniline (PANI), Fe3O4@UiO-66@PANI exhibited excellent efficiency, regeneration, and reusability performance for Cr(VI) removal. Its maximum adsorption capacity and removal rate were 474.42 mg·g–1 and 99.90%, respectively. The effects of initial pH values, contact time, and initial Cr(VI) concentration on Cr(VI) removal were investigated. The fitted data showed that the adsorption process was consistent with the pseudo-second-order kinetic model and Langmuir isothermal model. The study of the mechanism shows that the excellent efficiency of Fe3O4@UiO-66@PANI is due to the electrostatic adsorption and reduction of Cr(VI) and the chelation of Cr3+. The results demonstrate that Fe3O4@UiO-66@PANI is a promising adsorbent for the Cr(VI) removal.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
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2018
·
IF 5.16
Dongdong Yao,Ningkun Peng,Yaping Zheng
In this work, we report a simple strategy for improving the mechanical and thermal performances of epoxy resin using a novel magnetic composite nanofluid as filler. The magnetic nanofluid, composed of multicomponent core of graphene oxide (GO)/carbon nanotube (MWCNTs)/Fe 3 O 4 (GMF) and shell of polyether , is fabricated via a combination of ultrasonic assisted chemical coprecipitation process and post-modification. Subsequently, epoxy/GMF composite is prepared under magnetic field, in which the GMF nanoparticles are well dispersed in the epoxy resin matrix without obviously agglomeration and exhibit a directional arrangement along magnetic field. i.e., the GO sheets are induced to align parallel to the magnetic field direction, and the MWCNTs are uniformly dispersed on graphene sheets with the orientation along magnetic field, Fe 3 O 4 nanoparticles are further encapsulated on GO/MWCNTs composites to form GMF core. The orientation degree of GMF is enhanced with an increase in the magnetic field strength . The results indicate that the Tg of composite material increases by 17 °C with increasing of GMF content. Moreover, the impact and bending performances of epoxy resin are apparently enhanced by 136.5% and 30.9% with the 1.5 wt% of oriented GMF nanofluid at 0.6 T. In addition, the epoxy/GMF composite exhibits an anisotropy in the thermal conductivity .
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