Materials
·
2024
·Vol. 17
·期 17
·4325
·
IF 3.1
Jinying Zhang,Xinye Wang,Jiaxing Yang,Yexiaotong Zhang
Constructing photonic crystals with core-shell structured nanoparticles is an important means for applications such as secure communication, anti-counterfeiting marking, and structural color camouflage. Nonetheless, the precise synthesis technology for core-shell structured nanoparticles at the hundred-nanometer scale faces significant challenges. This paper proposes a controlled synthesis method for core-shell structured nanoparticles using a template method. By using 100 nm diameter silica nanospheres as templates and coating them with a ferroferric oxide shell layer, SiO2@Fe3O4core-shell structured nanoparticles with regular morphology and good uniformity can be obtained. The study experimentally investigated the effects of feed amount, modifiers, temperature, and feed order on the coating effect, systematically optimizing the preparation process. Centrifugal driving technology was used to achieve structural colors in the visible wavelength range. Additionally, the method successfully created well-defined and uniform core-shell structured nanoparticles using 200 nm diameter silica nanospheres as templates, demonstrating that this controllable synthesis method can effectively produce core-shell structured nanoparticles over a wide range of particle sizes. The template method proposed in this paper can significantly improve morphological regularity and size uniformity while effectively reducing the preparation cost of core-shell structured nanoparticles.
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高影响因子
Biomaterials Science
·
2020
·Vol. 8
·期 16
·4492-4507
·
IF 6.183
Wenqin Li,Wenying Wei,Xiaopei Wu,Yanan Zhao,Honglian Dai
Unrestricted usage of antibiotics has accelerated the emergence of new strains of microorganisms with antimicrobial resistance (AMR) and the development of therapeutic technologies that do not rely only on antibiotics. Herein, mesoporous hollow Fe3O4 nanoparticles (MHFPs) were synthesized by a one-pot hydrothermal method, and the feasibility and possible mechanism of using alternating magnetic field (AMF) with MHFPs to kill Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were explored. The presence of the AMF (2.5 kW, 210 kHz) combined with the MHFPs resulted in a dramatic decrease in colony forming units (CFU) for E. coli and S. aureus in 25 min compared with the pure MHFPs at concentrations of 500, 800 and 1000 μg mL−1. Macroscopic hyperthermia was proved not to be the sole reason for the phenomenon. Visible membrane damage was demonstrated by live/dead staining, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) assays. Besides, the permeability and integrity changes of the cell membrane were then quantitatively confirmed by measuring the relative electrical conductivity. In addition, bacterial biofilms were significantly dispersed in the presence of MHFPs and AMF. These results suggested that under the mediation of AMF, MHFPs can potentially serve as an efficient nonantibiotic therapeutic platform to disperse bacterial biofilms and inactivate bacteria by damaging the cell membrane of the bacteria.
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JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2025
·
IF 1.9
Meng Yu,Leilei Tie,Yubao Sun,Jingjing Zhou,Rui Qin,Ruxiang Gong,Cheng Zhang,Renling Lu
To solve the demulsification problem of waxy crude oil emulsion on offshore oilfields, alkyl phenolic resin polyether and silicon-containing polyether were grafted onto the surface of epoxy functionalized nano-Fe3O4, respectively, and two magnetic nano demulsifiers with high interfacial activity were successfully synthesized (Fe3O4@AP and Fe3O4@SP). The crystal structure, morphology, particle size, functional groups, chemical composition, thermal stability, and magnetic properties of magnetic nanomaterials synthesized at different stages were characterized and analyzed, confirming the successful synthesis of two magnetic nano-Fe3O4 demulsifiers with a particle size of around 10 nm and superparamagnetism. Through bottle tests, it was demonstrated that at 70 °C and within 90 min, the demulsification efficiencies of alkyl phenolic resin polyether and silicon-containing polyether demulsifiers for crude oil emulsions were 80.0% and 82.5%, respectively. In contrast, the demulsification efficiencies of Fe3O4@AP and Fe3O4@SP reached 95.0% each. Interfacial tension tests revealed that the superior demulsification performance of polyether-grafted nano-Fe3O4 is attributed to the rapid diffusion in the continuous phase and the higher interfacial activity of the magnetic nanoparticles.
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Nanoscale
·
2017
·Vol. 9
·期 47
·18699-18710
·
IF 7.367
Bing Tan,Huimin Zhao,Weihao Wu,Xuan Liu,Yaobin Zhang,Xie Quan
Two-dimensional (2D) metal–organic framework (MOF) nanosheets emerging as a new member of the 2D family have received significant research interest in recent years. Herein, we have successfully synthesized 2D copper-based MOF nanosheets with bimetallic anchorage using a facile two-step process at room temperature and ambient pressure, denoted as Cu(HBTC)-1/Fe3O4-AuNPs nanosheets. The as-synthesized 2D bimetallic MOF nanosheets displayed enhanced peroxidase-like activity with relatively high catalytic velocity and affinity for substrates compared with previously reported peroxidase mimics. Furthermore, their intrinsic peroxidase-like catalytic activity could be flexibly regulated by single-stranded DNA (ssDNA), exhibiting the enhancement of 3,3′,5,5′-tetramethylbenzidine (TMB) oxidation or inhibition of 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid)diammonium salt (ABTS) oxidation due to the adsorption of ssDNA via π–π stacking. Accordingly, on the basis of their peroxidase-like activity, our prepared 2D bimetallic immobilized MOF nanosheets achieved ultra-sensitive detection of H2O2 with a linear range of 2.86 to 71.43 nM, and comparable detection performance for glucose with a linear range of 12.86 to 257.14 μM. By means of their controllable peroxidase-like activity, a versatile colorimetric sensing platform was developed which realized the detection of sulfadimethoxine (SDM) with a linear range of 3.57 to 357.14 μg L−1 and the limit of detection (LOD) of 1.70 μg L−1. With the multiplexed performance for detecting various targets, our as-synthesized bimetallic MOF nanosheets hold great promise for applications in environmental monitoring, as well as bioassays by virtue of their good biocompatibility.
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NANO
·
2025
·
IF 1.1
Nana Li,Alexpandi Rajaiah,Kuanjie Ma,Guochao Lu,Yucong Yu,Yurong Cai
To address the need for rapid protein desorption in protein adsorption applications, we developed and characterized polyethyleneimine-functionalized calcium carbonate nanoparticles coated with ferrosoferric oxide (PEI-Fe 3 O 4 @CaCO 3 ) . This hybrid nanostructure integrates the pH-sensitive properties of calcium carbonate with the magnetic responsiveness of Fe 3 O 4 , enabling quick separation by an external magnetic field within 1 min. In adsorption experiments with bovine serum albumin (BSA) as a model protein, PEI-Fe 3 O 4 @CaCO 3 achieved a notable adsorption capacity of 197.6 mg/g at 1 h, representing 77% of its maximum adsorption potential. Saturation was reached at 256.1 mg/g within 4 h. Importantly, the pH-responsive nature of the calcium carbonate component facilitated efficient desorption, achieving a release efficiency of 95.67% ± 2.41% within 1 min in a sodium acetate–acetic acid buffer at pH = 6.2. This pH-responsive and magnetically responsive system demonstrates significant potential for applications requiring fast, controlled protein adsorption and desorption, offering a promising tool for targeted protein recovery in various biochemical and industrial processes.
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MOLECULES
·
2025
·Vol. 31
·期 1
·134
·
IF 4.6
Xiaoxing Zeng,Kunlei Wang,Hongting Ye,Xiaofeng Gong,Yanhong Yao,Fei Feng
A novel recyclable composite, Fe 3 O 4 /chitin/BiOCl, was synthesized via a solvothermal approach using cetyltrimethylammonium bromide (CTAB), bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O), chitin, and Fe 3 O 4 as precursors. The composite was systematically characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer–Emmett-Teller (BET) analysis, ultraviolet–visible (UV-vis) spectroscopy, and vibrating sample magnetometry (VSM). Characterization results indicated that the incorporation of chitin significantly improved the porosity and specific surface area of the catalyst. Furthermore, the synergistic effects between chitin and Fe 3 O 4 effectively reduced the recombination rate of photogenerated electron–hole pairs. The photocatalytic activity of the composite was evaluated by degrading ciprofloxacin (CIP) under visible-light irradiation. When the contents of Fe 3 O 4 and chitin were 5% and 2% (by weight), respectively, the catalyst exhibited excellent photocatalytic performance with a degradation rate of 89.54%, and the rate constant was 5.1 times higher than that of pure BiOCl. Additionally, the catalyst exhibited excellent magnetic recoverability and photocatalytic stability.
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高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Shaoxi Zhang,Xiangnan Chen,Zhiyong Zhang,Xiaolong Song,Guangjun Gou
Nowadays, the practical application of electromagnetic absorbing materials required lightweight, high efficiency and especially broadband. Wherein, graphene-based electromagnetic absorbing materials had received extensive attention. The conventional design was to introduce magnetic particles onto graphene, but often lead to narrow bandwidth, hard to regulate, due to the lack of intrinsic coupling between magnetic particles and dielectric graphene. In principle, defect engineering could induce intrinsic ferromagnetism into graphene while increasing dielectric polarization loss, could be an effective means of expanding and regulating electromagnetic absorbing bands. Thus, in this paper, Cu/Fe 3 O 4 heterogeneous nanospheres was constructed onsite defect-rich graphene to realize broadband electromagnetic absorbing modulation. The optimal RL value of Cu/Fe 3 O 4 /GE could reach −45.5 dB with obvious multi-band absorption, which was mainly attributed to the synergistic enhancement of defect-induced polarization loss, multiple interfacial polarization loss, as well as collaborative multipath magnetic loss. This work provides reference way for lightweight multi-band electromagnetic absorbing materials design.
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高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 6
·4608-4618
·
IF 1.556
Cui Qinmin,Zhu Shudi,Yan Yingjie,Ye Quanlin,Ziener Ulrich,Cao Zhihai
In the present study, superparamagnetic Fe3O4/poly(N-isopropyl acrylamide) nanocomposites were synthesized by one-step inverse miniemulsion copolymerization of N-isopropyl acrylamide and N,N'-methylene diacrylamide. The loading of Fe3O4 nanoparticles
in the nanocomposites was 27 wt%, and the saturation moment of the nanocomposites was 12.4 emu · g−1. Fe3O4 nanoparticles were prepared through a coprecipitation method. The amount of stabilizer (poly(acrylic acid)) significantly influenced the
size and size distribution of the Fe3O4 nanoparticles, and, therefore, their magnetic properties. Superparamagnetism of the Fe3O4 nanoparticles was preserved in the nanocomposites. The effects of synthetic parameters on the particle properties, namely
surfactant loading, concentration of ferrofluid, type of lipophobe and initiator, and amount of cross-linker were investigated. Nanocomposites of Fe3O4/poly(N-isopropyl acrylamide) displayed a guava-like morphology, which they could retain after being redispersed
in polar solvents.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Xin Liu,Jihui Wang,Wenbin Hu
The hollow Fe 3 O 4 microspheres were firstly synthesized by solvothermal method. And then Fe 3 O 4 /MBT nanocomposite inhibitor was obtained by loading 2-mercaptobenzothiazole (MBT) inhibitor under negative vacuum impregnation treatment and characterized using transmission electron microscopy , X-ray diffraction, Fourier transform infrared spectroscopy , nitrogen adsorption-desorption isotherms and vibrating sample magnetometer . The release behavior of MBT and inhibition behavior of Fe 3 O 4 /MBT nanocomposite under different magnetic field (MF) strength were evaluated by UV–vis spectroscopy, electrochemical techniques and immersion tests. The results show that the synthesized superparamagnetic Fe 3 O 4 /MBT nanocomposite shows high MBT loading capacity of 55.4 %. Under the application of MF, the release behavior of MBT from Fe 3 O 4 /MBT is dominated by Fickian diffusion and diffusion among magnetic nanoparticles , and the release rate and inhibition efficiency are less than that of without MF under the same release time. The nanocomposite has a good inhibition effect for carbon steel in NaCl solution with maximum inhibition efficiency of 95.7 %, and also possesses excellent recycling stability with loading capacity of 45.1 % and inhibition efficiency of 78.8 % after five cycles.
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高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·123007
·
IF 2.142
Guodong Zhang,Jiaqi Chen,Yao Liu
Iron-based soft magnetic composites (SMCs) were prepared by two-step ball milling with sodium silicate and ferroferric oxide. The presence of the precoated silicate layer has increased the resistivity of the powder surface, which also improved the agglomeration of ferroferric oxide. The addition of magnetic ferroferric oxide improves the dilution effect. Combining the advantages of both sodium silicate and ferroferric oxide, the prepared soft magnetic composite material has excellent performance. After annealing at 400 °C, the core loss is 214.5 W Kg−1 (1 T, 1000 Hz), and the saturation magnetic induction is 1.33 T.
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Corrosion Communications
·
2022
·
IF 0
Jinke Wang,Shanghao Wu,Lingwei Ma,Bing Zhao,Haowen Xu,Xiaolun Ding,Dawei Zhang
This work synthesized novel Fe 3 O 4 nanoparticles loaded with 2-mercaptobenzothiazole corrosion inhibitors (Fe 3 O 4 -MBT NPs), which possessed not only photothermal conversion property but also corrosion inhibition ability. The loading percentage of MBT inhibitors in the Fe 3 O 4 -MBT NPs was 9.69 wt.%. The obtained Fe 3 O 4 -MBT NPs were incorporated into a shape memory epoxy coating to achieve passive protection and self-healing property. The passive protection property of intact Fe 3 O 4 -MBT/epoxy coating was assessed using electrochemical impedance spectroscopy (EIS) measurement during immersion in 3.5 wt.% NaCl solution. The low-frequency impedance modulus at 0.01 Hz of the composite coating containing 3 wt.% Fe 3 O 4 -MBT NPs was approximately 5 times higher than that of the blank epoxy coating after 240 h of immersion, indicating the superior barrier property of the composite coating. As for the self-healing property, the scratch width on the coating surface could narrow from 80 µm to ∼5 µm after near-infrared (NIR) light irradiation for 30 s, which was ascribed to the excellent photothermal conversion property of Fe 3 O 4 NPs. EIS results verified that both the scratch closure triggered by the photothermal conversion of Fe 3 O 4 NP and the release of MBT inhibitors are beneficial for the suppression of corrosion activity within the coating scratch. The Fe 3 O 4 -MBT/epoxy coating with outstanding passive protection and self-healing property holds great potential to achieve long-term corrosion protection.
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Surface Topography-Metrology and Properties
·
2022
·Vol. 10
·期 4
·045020
·
IF 2.185
Bo Lin,Wan-Yi Chen,Kwok-Ho Lam,Na Shi,Bo Shi,Ying Yang,Yu-Ma Yang,Fu-An He,Li-Wang Jiang
A fluorine-free strategy was developed for the hydrophobic modification of the melamine (MA) sponge, in which both the stearic acid-modified Fe3O4 nanoparticles (SA-Fe3O4) and the graphite oxide were immobilized on the MA sponge with the use of 3-aminopropyltriethoxysilane by a drop-coating method to prepare the SA-Fe3O4/GO/MA sponge for oil-water separation. The structure of the SA-Fe3O4/GO/MA sponge was investigated by FITR, WAXD, SEM, two-dimensional EDS mapping, TGA, and VSM. The contact angles of the SA-Fe3O4/GO/MA sponge prepared with different amounts of SA-Fe3O4 and GO were in the range of 140.2° − 145.0°, which confirmed the successful hydrophobic surface modification for the MA sponge. The demonstrations exhibited that the SA-Fe3O4/GO/MA sponge could separate the oil from the oil-water mixture by both direct absorption and gravity-driven filtration. Additionally, the SA-Fe3O4/GO/MA sponge possessed not only high absorption capacities for peanut oil, n-hexane, soybean oil, and diesel oil, but also good abilities of being able to recollect magnetically and reuse. The proposed preparation strategy and overall performance of SA-Fe3O4/GO/MA sponge were promising for the oil-water separation in the future.
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