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.
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Nanoscale
·
2013
·Vol. 5
·期 5
·2107-2113
·
IF 6.233
Leyong Zeng,Wenzhi Ren,Lingchao Xiang,Jianjun Zheng,Bin Chen,Aiguo Wu
Multifunctional Fe3O4–TiO2 nanocomposites with Janus structure for magnetic resonance imaging (MRI) and potential photodynamic therapy (PDT) were synthesized, in which Fe3O4 was used as a MRI contrast agent and TiO2 as an inorganic photosensitizer for PDT. Their morphology, structure, and MRI and PDT performance were characterized, respectively. Moreover, the location of Fe3O4–TiO2 nanocomposites in MCF-7 cells was also investigated by the staining of Prussian blue and alizarin red, respectively. The results showed that the as-prepared Fe3O4–TiO2 nanocomposites had good T2-weighted MRI performance, and the MCF-7 cells incubated with nanocomposites could be killed under the irradiation of UV light. Compared with traditional organic photosensitizers, TiO2 inorganic photosensitizers could have more stable PDT performance due to their nanoscale size and anti-photodegradable stability. Therefore, the as-prepared Fe3O4–TiO2 nanocomposites could have potential applications as a new kind of multifunctional agent for both MRI and PDT.
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WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 7
·1-16
·
IF 3
Jiang Yinying,Yu Jiang,Huang Zhi,Yu Jie,Deng Siwei,Zhu Weiwei,Zeng Zixin
Metformin (MET), recognized as the most extensively consumed pharmaceutical globally, exhibits minimally metabolized and is predominantly excreted unchanged. To remove MET from water, this study synthesized Fe 3 O 4 @MnO 2 (FM) catalysts, which could be easily recoverable using magnets. Notably, Fe 3 O 4 nanospheres, characterized by their superior crystallinity, significantly altered the morphology and structure of the externally wrapped MnO 2 . This modification resulted in an expanded surface area and an increased number of active sites. Furthermore, ultrasound (US) was employed to assist in peroxymonosulfate (PMS) activation, ensure effective dispersion of FM-5, and enhance the homogeneity of the reaction system. The synergistic application of US and FM-5 successfully activated PMS, achieving a remarkable MET degradation efficiency of 98.89% within 80 min, predominantly via a pathway governed by ·O 2 − and 1 O 2 . The FM-5/US/PMS system demonstrated robust adaptability under various environmental conditions. An analysis of the correlation mechanism revealed enhanced MET decomposition under alkaline conditions, thereby broadening the pH adaptation range of FM-5/US/PMS. Using density functional theory (DFT) calculations and HPLC–MS detection to propose degradation products, this study identified a product with comparatively lower toxicity. This work could offer a reference for further development of high performance and eco-friendly catalyst. Graphical
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CARBON
·
2025
·
IF 11.6
Ruonan Li,Zelin Zhang,Xiao Li,Zhongming Liu,Haowei Zhou,Xinyue Zhang,Di Zhou,Aibing Chen,Lei Xie
The escalating use of electronic devices in civil and military sectors has led to severe electromagnetic interference issues due to excessive electromagnetic radiation, impacting both equipment functionality and human well-being. Addressing this, electromagnetic wave absorption materials, particularly magnetic carbon superstructures, offer a dual loss mechanism suitable for microwave absorption, gaining much attention. In this work, through a polyelectrolyte-assisted assembly strategy, magnetic carbon superstructures (MCSSs) with high performance characteristics such as ultra-wide effective absorption bandwidth and minimal reflection loss have been developed. Detailed structural analyses through microscopy, XRD, elemental analysis, and magnetic studies confirm the successful synthesis of MCSSs with hierarchically porous structures, high specific surface areas of 476.6 m 2 g −1 , total pore volume of 0.27 cm 3 g −1 , and notable ferromagnetic properties. Each independently existing spherical MCSSs can be viewed as a separate confined space, in which well-dispersed homogeneous magnetic particles exist, which greatly improves the undesirable condition of local impedance matching imbalance caused by agglomeration of magnetic components due to intrinsic magnetic properties. Finally, the MCSSs hold excellent microwave absorption of −62.23 dB and radar cross section attenuation of 16.80 dB m 2 . These findings underscore the potential of magnetic carbon superstructures in advancing electromagnetic wave absorption technologies and highlight the importance of tailored design for optimizing material properties.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Meiijian Wang,Hao Wang,Shiyun Lou,Dexi Tao,Yaolin Tang,Bingfang Zou,Yongqiang Wang
Liquid-phase microextraction (LPME) relies critically on precise solvent control to achieve efficient extractant recovery. To address this, we developed a magnetic microparticle-based dispersive liquid-phase microextraction (MP-DLPME) strategy, employing hydrophobic porous Fe 3 O 4 microparticles (∼1 μm) as solvent-stabilizing microcarriers. These microparticles were functionalized via covalent grafting of 3-chloropropyltriethoxysilane (CPS) and optimized porosity, enabling rigid confinement of organic solvents (e.g., 1-octanol) through dual mechanisms: (I) hydrophobic solvent anchoring to modified surfaces and (II) capillary trapping within mesopores. When applied to hydrophobic polycyclic aromatic hydrocarbons (PAHs) and organophosphorus pesticides (OPPs), the system generates solvent-encapsulated magnetic aggregates that dynamically fragment into microdroplets under vortex-induced shear forces, facilitating efficient analyte extraction via magnetic collection. By integrating the high efficiency of dispersive extraction with the rapid recovery of magnetic separation, the MP-DLPME method provides a robust sample pretreatment solution for environmental water analysis.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Marhaba Mamat,Xiaofeng Wang,Lin Wu,Rong Zhao,Jin Cao,Xueyong Qi,Song Shen
The hypoxic tumor environment prevents the generation of reactive oxygen species (ROS), reducing the therapeutic efficiency. We construct oleylamine (OA) coated CaO 2 /Fe 3 O 4 nanocomposites to realize oxygen-independent generation of ROS and high efficient treatment of cancer. In the tumor site, CaO 2 reacts with water to generate H 2 O 2 , which can be catalized by Fe 2+ that is produced by Fe 3 O 4 , to form highly toxic hydroxyl radicals (∙OH). To inhibit the premature reaction, CaO 2 /Fe 3 O 4 nanoparticles were coated with pH sensitive OA. The nanocomposites exhibited remarkable tumor growth inhibition ability and favorable biocompatibility, holding a great potential for hypoxic tumor therapy.
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CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jiabo Tang,Xinghong Liu,Xiaolin Chang,Xiang Ji,Wei Zhou
Geopolymers are an economical, durable and environmentally friendly building material that achieves ultimate strength superior to concrete within hours and can withstand extreme high temperatures without degradation, but they lack elasticity and have poor flexural strength . To tackle these challenges, this paper presents a novel nanotechnological and affordable method to produce an elastic geopolymer that can be used as a construction material. Specifically, we report a simple and straightforward strategy that combines electrospinning and the sol-gel process to construct geopolymer nanofibers with superelasticity , extreme durability, and fire resistance. In order to improve the safety level of building construction sites that experience extreme conditions, such as freeze-thaw deterioration, the geopolymer nanofibers can be further functionalized by incorporating various functional components. In this study, Fe 3 O 4 nanoparticles (NPs) adsorbed by an electric double layer structure were dispersed in a geopolymer sol (SAPOs). Elastic geopolymer nanofibers embedded with Fe 3 O 4 nanoparticles were then prepared (Fe 3 O 4 /SAPOs) by an electrospinning method . Nanofibers constructed by such a compound method could have superparamagnetic behaviors and stable chemical properties. When Fe 3 O 4 /SAPOs are exposed to an alternating magnetic field , eddy currents are generated that cause the geopolymer nanofibers to heat up. This self-heating behavior is a powerful feature that enhances the freeze-thaw resistance of building materials at high altitudes. The nanotechnological route of this study could provide novel insights into the development of advanced construction materials.
研究领域:
材料科学
·
纳米技术
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CARBON
·
2021
·
IF 9.594
Zheng Cheng,Yishu Cao,Ruofeng Wang,Lun Xia,Suping Ma,Zhuo Li,Zhihao Cai,Zhiwei Zhang,Yi Huang
The development of structure/function integrated materials is an important trend in military field. Herein, a hierarchical structure was introduced on carbon fiber surface via the successively grafting of polyacrylic acid (PAA) layer and Fe 3 O 4 nanoparticles . It is found that this hierarchical structure could simultaneously improve the composites interfacial strength (30.5%) and toughness (82.6%), due to the mechanical interlocking by Fe 3 O 4 and polarity matching by PAA layer. Moreover, for fiber's microwave absorption (MA) performance, the introduced magnetic Fe 3 O 4 nanoparticles facilitate the impedance matching and magnetic loss, and large number of dipoles from PAA provide polarization loss for microwave dissipation, and finally lead to enhanced MA properties with strong absorption (−40.6 dB) and a wide effective bandwidth (6.13 GHz). In all, the present study offers a facile strategy for the preparation of structural/microwave-absorbing integrated carbon fiber, and could further provide guidance for other carbon fiber-based multifunctional materials.
研究领域:
材料科学
·
复合材料
·
电磁学
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Ji Fang,Xu Min,Wang Chao,Li Xiaoyuan,Gao Wei,Zhang Yunfei,Wang Baorui,Tang Guangping,Yue Xiaobin
The cubic Fe 3 O 4 nanoparticles with sharp horns that display the size distribution between 100 and 200 nm are utilized to substitute the magnetic sensitive medium (carbonyl iron powders, CIPs) and abrasives (CeO 2 /diamond) simultaneously which are widely employed in conventional magnetorheological finishing fluid. The removal rate of this novel fluid is extremely low compared with the value of conventional one even though the spot of the former is much bigger. This surprising phenomenon is generated due to the small size and low saturation magnetization ( M
s ) of Fe 3 O 4 and corresponding weak shear stress under external magnetic field according to material removal rate model of magnetorheological finishing (MRF). Different from conventional D-shaped finishing spot, the low M
s also results in a shuttle-like spot because the magnetic controllability is weak and particles in the fringe of spot are loose. The surface texture as well as figure accuracy and PSD1 (power spectrum density) of potassium dihydrogen phosphate (KDP) is greatly improved after MRF, which clearly prove the feasibility of substituting CIP and abrasive with Fe 3 O 4 in our novel MRF design.
研究领域:
材料科学
·
光学工程
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Xin Liu,Lu Jiang,Qiushi Li,Yan Dong,Yifan Lv,XinYi Li,LongXu Liu
Corrosion of carbon steel can result in serious damage, limiting its application in various fields. Considerable protective coatings have been proposed, but they are limited by difficulties in repairing and early warning of coating damage and local metal corrosion. Herein, a dual-functional smart anti-corrosion coating with integrated self-healing and self-warning capabilities was designed and fabricated. Firstly, the MBT + CVL@Fe 3 O 4 composite was prepared by loading corrosion inhibitor 2-mercaptobenzothiazole (MBT) and fluorescent probe crystal violet lactone (CVL) into mesoporous Fe 3 O 4 microspheres. The system demonstrated a stimulus-responsive release of MBT, providing effective corrosion inhibition for Q235 steel. Subsequently, the MBT + CVL@Fe 3 O 4 composite was incorporated as a functional filler into a shape memory epoxy (EP) coating. The results showed that the optimum addition amount of filler was 2 wt% because the MBT + CVL@Fe 3 O 4( 2% ) /EP coating presented the smoother surface, maximum water contact angle, and impedance value under damaged conditions. Based on the photothermal effect of Fe 3 O 4 -based filler combined with the shape memory effect of epoxy resin, when irradiated for 60 s, the surface temperature of the scratched MBT + CVL@Fe 3 O 4( 2% ) /EP was about 55 °C, exceeding its glass transition temperature ( T g ≈ 49.5 °C). Consequently, the scratch width was markedly reduced, demonstrating effective self-healing of the external coating damage. Moreover, when the coating damage even caused local corrosion of the metal substrate and changes in the pH of the corroded area, the corrosion inhibitor MBT was responsively released, forming a protective film layer to protect the metal substrate from further degradation. The low-frequency impedance |Z| 0.01 Hz values of scratched pure epoxy coating (EP), scratched MBT + CVL@Fe 3 O 4( 2% ) /EP and photothermal healed scratched MBT + CVL@Fe 3 O 4( 2% ) /EP immersed in 3.5 % NaCl solution for 120 h were 4.98 × 10 4 Ω·cm 2 , 4.78 × 10 5 Ω·cm 2 and 1.31 × 10 6 Ω·cm 2 , respectively, which fully illustrated the dual repair function of the coating. Additionally, the CVL loaded in the filler provided the fluorescence color rendering performance of the coating. Under the irradiation of an ultraviolet lamp, the bright blue fluorescence signal can be displayed at the coating damage site, effectively predicting the coating damage. Moreover, CVL can produce fluorescence quenching when localized corrosion occurs on the metal substrate, warning of early corrosion. These results prove the self-warning performance of the anti-corrosive coating.
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Nanoscale
·
2026
·
IF 5.2
Wenkai Liu,Huawei Zhao,Dongqi Zhao,Yupeng Zhao,Muhammad Hamza Tariq,Jinhong Du,Ruotong Zhao,Yanqing Ma,Lei Ma
The studies on the morphology and phase of two-dimensional (2D) non-van der Waals iron oxides are often carried out independently, leaving their coupling relationship unexplored. Herein, we report an oxygen-potential-driven chemical vapor deposition (CVD) route that couple morphology control with phase selection in the same system. We vary only the quartz-tube outer diameter to modulate the oxygen flux, which tunes the oxygen chemical potential (μ_O) without requiring any sophisticated oxygen supplying equipment and transforms the product from magnetite (Fe3O4) to hematite (α-Fe2O3). With increasing μ_O, Fe3O4 evolves from sharp triangular to truncated triangular nanosheets. However regular hexagonal α-Fe2O3 nanosheets are obtained above this threshold, indicating morphology-phase coevolution. Opposite curvatures of Fe3O4 {111} A/B edges create a surface chemical-potential difference (Δμ) that drives the evolution into nanosheets bounded solely by A-type edges. DFT calculations show that increasing μ_O reduces Δμ, enabling retention of the B edge and yielding truncation. Correlative magnetic imaging further reveals morphology-domain coupling: vortex state in sharp triangles, weakened vortex upon truncation, multidomain characteristics when approaching hexagonal shape, and weak-ferromagnetic α-Fe2O3 with no magnetic phase contrast. This facile regulation method synchronizes phase selection and morphological engineering by regulating μ_O, laying the groundwork for structure-dependent spintronic device design.
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WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
·
2024
·Vol. 40
·期 8
·1-11
·
IF 4
Qiao Cailin,Yang Suping,Ma Yi,Wen Li,Chu Chengxiang,Luo Huibo,Luo Xiaogang,Hou Changjun,Huo Danqun
Saccharomyces cerevisiae , the primary microorganism involved in ethanol production, is hindered by the accumulation of ethanol, leading to reduced ethanol production. In this study, we employed histidine-modified Fe 3 O 4 nanoparticles (His-Fe 3 O 4 ) for the first time, to the best of our knowledge, as a method to enhance ethanol yield during the S. cerevisiae fermentation process. The results demonstrated that exposing S. cerevisiae cells to Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) led to increased cell proliferation and glucose consumption. Moreover, the introduction of His-Fe 3 O 4 significantly boosted ethanol content by 17.3% ( p < 0.05) during fermentation. Subsequent findings indicated that the increase in ethanol content was associated with enhanced ethanol tolerance and improved electron transport efficiency. This study provided evidence for the positive effects of His-Fe 3 O 4 on S. cerevisiae cells and proposed a straightforward approach to enhance ethanol production in S. cerevisiae fermentation. The mediation of improved ethanol tolerance offers significant potential in the fermentation and bioenergy sectors.
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