查找使用阿拉丁产品的科研文献

A Novel Photo-Responsive and Platelet-Compatible Strategy Based on Fe3O4-QCS-PEI-Cu and Aptamer for Targeted Inactivation of Bacterial Contaminants in Platelets

Bacterial contamination remains a critical safety concern in platelet transfusion, and there is an urgent demand for decontamination technologies that eliminate contaminating bacteria without damaging platelet viability and physiological function. Herein, Fe3O4-QCS-PEI-Cu-apt microparticles with enlarged magnetic cores were rationally fabricated to improve aptamer immobilization, aiming at targeted bacterial elimination via near-infrared (NIR) irradiation while maintaining platelet function. Fluorescence assays confirmed their specific targeting capability towardStaphylococcus aureus(S. aureus) without binding to platelets. Magnetic separation experiments demonstrated that the aptamer-functionalized microparticles could efficiently capture and remove 91.35% ofS. aureusfrom platelets. NIR irradiation of the Fe3O4-QCS-PEI-Cu core induced marked bactericidal activity againstS. aureusin suspension, as determined by plate counting and LIVE/DEAD staining. This antibacterial ability originated from the intrinsic photo-responsive property of the composite rather than from aptamer-mediated recognition, and could be easily extended to bacteria captured by aptamer-functionalized particles. Comprehensive biocompatibility evaluations, including morphological observation, hematological parameter analysis, CD62P expression detection, and thromboelastography (TEG) were performed. And the results demonstrated that there were no significant changes in platelet morphology, count, activation state, or overall hemostatic function, apart from an increase in the α angle. This platform achieves efficient targeted NIR-triggered antibacterial efficacy while maintaining excellent platelet compatibility, offering a promising strategy to enhance the safety of platelet transfusion.

Preparation of MIL-68@Fe3O4@PVDF composites via the spray phase inversion method and their magnetic solid-phase extraction of parabens and bisphenol A

Xinwen Hu,Yong Zhang,Zhihao Chen,Mengqian Xiao,Litao Wang,Guihua Gao

In this study, the spray phase inversion method was employed for the first time to prepare MIL-68@Fe3O4@PVDF. The preparation process involved dispersing Fe3O4 in a PVDF/DMF solution; when the Fe3O4-loaded PVDF solution was atomized and sprayed into ethanol containing dispersed MIL-68, PVDF underwent phase inversion to form magnetic solid microspheres, with MIL-68 simultaneously immobilized on their surface. The procedure is facile, convenient, and suitable for the synthesis of various magnetic composites. The MIL-68@Fe3O4@PVDF composite exhibited favorable adsorption performance toward methylene blue (MB). The adsorption kinetics and isotherm data were well fitted to the pseudo-second-order kinetic model and the Langmuir isotherm model, respectively, indicating monolayer chemisorption on homogeneous adsorption sites. Based on this, a magnetic solid-phase extraction (MSPE) method coupled with high-performance liquid chromatography (HPLC) was established using MIL-68@Fe3O4@PVDF as the adsorbent for the determination of five parabens and bisphenol A (BPA) in water samples. After optimizing the MSPE conditions, the established method showed a good linear relationship for parabens and BPA in the concentration range of 1.5–400.0 ng mL−1 (r > 0.9996). It also achieved low limits of detection (LODs, 0.4–1.0 ng mL−1) and limits of quantitation (LOQs, 1.3–4.0 ng mL−1), along with high spiked recoveries (80.0–107.3%) and acceptable precision (RSD ≤ 8.81%). In conclusion, the spray phase inversion method provides a simple and efficient strategy for fabricating magnetic composites. Furthermore, it offers a novel approach to improve the application efficiency of nano-adsorbents in MSPE, laying a foundation for their broader use in the trace analysis of complex samples.

Liquid nitrogen quenching inducing lattice tensile strain to endow nitrogen/fluorine co-doping Fe3O4 nanocubes assembled on porous carbon with optimizing hydrogen evolution reaction

Chao Wang,Wei Wang,Wenxin Guo,Dongxuan Guo,Jinlong Li,Xue Yang,Shanshan Fu,Dong-Feng Chai,Guozhe Sui,Yue Li

In this work, the lattice tensile strain of nitrogen/fluorine co-doping ferroferric oxide (Fe 3 O 4 ) nanocubes assembled on chrysanthemum tea-derived porous carbon is induced through a novel liquid nitrogen quenching treatment (named as TS-NF-FO/PC X -Y, TS: Tensile strain, NF: Nitrogen/Fluorine co-doping, FO: Fe 3 O 4 , PC: Porous carbon, X: The weight ratio of KOH/carbon, Y: The adding amount of porous carbon). Besides, the electrocatalytic activity influenced by the adding amount of porous carbon, the type of dopant, and the introduction of lattice tensile strain is systematically studied and explored. The interconnected porous carbon could improve electrical conductivity and prevent Fe 3 O 4 nanocubes from aggregating. The induced nitrogen/fluorine could cause extrinsic defects and tailor the intrinsic electron state of the host materials. Lattice tensile strain could tailor the surface electronic structure of Fe 3 O 4 via changing the dispersion of surface atoms and their bond lengths. Impressively, the designed TS-NF-FO/PC 5 -0.25 delivers a low overpotential of 207.3 ± 0.4 mV at 10 mA/cm 2 and demonstrates desirable reaction dynamics. Density functional theory calculations illustrate that the electron structure and hydrogen adsorption free energy (ΔG *H ) are optimized by the synergistic effect among porous carbon, nitrogen/fluorine co-doping and lattice tensile strain, thus promoting hydrogen evolution reaction (HER) catalytic activity. Overall, this work paves the way to unravel the enhancement mechanism of HER on transition metal oxide-based materials by electronic structure and phase composition modulation strategy.

Gas–Liquid Reactions to Synthesize Positively Charged Fe3O4 Nanoparticles on Polyurethane Sponge for Stable and Recyclable Adsorbents for the Removal of Phosphate from Water

Yuanliang Huang,lili Liu,Chengyao Hu,Kun Xiong,Dongmei Li,Yawen Huang

The application of most current phosphate adsorbents is limited by their high cost, low removal capacity, difficulty of recovery, and short lifetime. In this study, we developed a gas–liquid reaction assisted by a coordination method to prepare highly positively charged ferroferric oxide (Fe3O4) nanoparticles loaded on polyurethane sponge. It was found that the gas–liquid reaction drastically decreases the size and increases the loading capacity of Fe3O4 nanoparticles as compared with the conventional liquid method. Further, the use of trimethylamine vapor induced the coordination of Fe3+, facilitated the formation of free Cl ions, and inhibited the hydrolysis of Fe–Cl bonds, thus greatly decreasing the amount of hydroxyl groups and increasing the surface positive charge on Fe3O4 nanoparticles. As a result, the Fe3O4 nanoparticles in this study have a saturated PO43– adsorption capacity of 229.8 mg·g–1, which was appreciably higher than that of conventional Fe3O4 adsorbents (57.8 mg·g–1). Our study further revealed that the introduction of a thin layer of polyurethane coating on the surface of Fe3O4 nanoparticle-composited adsorbents could drastically improve their stability while preserving the adsorption capacity under the impact of water (500 rpm stirring for 72 h). The composited adsorbents also preserve the adsorption capacity after recycling three times. Finally, the adsorption experiment on real river wastewater indicated that the composited adsorbents enable the decrease of phosphate concentration from 0.6 to 0.02 ppm, reflecting the application potential for relieving phosphate pollution in neutral waters.

Fabrication of magnetic Au/Fe3O4/MIL-101(Cr) (AF-MIL) as sensitive surface-enhanced Raman spectroscopy (SERS) platform for trace detection of antibiotics residue

Qinchao Shao,Xiubin Zhang,Pei Liang,Qiang Chen,Xiaohua Qi,Mingqiang Zou

Fabrication of a magnetic substrate based on metal–organic frameworks (MOFs) with high sensitivity and stability for surface-enhanced Raman scattering (SERS) analysis were reported in this paper. MIL-101(Cr) nanoparticle prepared via a traditional hydrothermal reaction, which was combined with Fe 3 O 4 to synthesize the Fe 3 O 4 /MIL-101(Cr) composites. Then, the concentration of chloroauric acid and the time of reduction reaction were adjusted to acquire the optimal Au/Fe 3 O 4 /MIL-101(Cr) (AF-MIL) SERS substrate. The detection ability of the substrate can down to 10 -8 mol/L for Rhodamine 6G (R6G) as probe molecule, and the relative standard deviation (RSD) is only about 4.48 %, which indicates that it possesses wonderful SERS performance and uniformity. Finally, the as-synthesized substrate has been adopted to test the trace level sulfapyridine, with its desirable detection ability can down to 10 -6 mol/L. Such desirable SERS substrate with facile and effective operation holds great promise in the fast sensitive detection of the antibiotic residue and some other pollutants in environment.

Carbon-coated Fe3O4 nanoparticles in situ grown on 3D cross-linked carbon nanosheets as anodic materials for high capacity lithium and sodium-ion batteries

Shuijing Yu,Zhenjiang Lu,Jing Xie,Jindou Hu,Yali Cao

Fe3O4 nanomaterials with desired electrochemical properties in energy conversation and storage are considered a potential substitute for the graphite anode because of their high lithium (Li) ion and sodium (Na) ion storage in a new system of green secondary batteries. In this work, 3D cross-linked Fe3O4@C composites (Fe3O4@N/C) comprising Fe3O4 nanoplates coated on C nanosheets were prepared in one step by a solvent-free method and they showed porous structures with a high special surface area. The porous hierarchical structures could not only enhance the electron/ion transport in the electrochemical charge/discharge process but also reduce the spatial effect in long-term use. At the same time, the carbon-coated Fe3O4 hierarchical structures could slow down the volume change caused by Li+/Na+ embedment and prostration, and effectively prevent the structure from crushing in the continuous application. Besides, the additional organic nitrogen in situ doping from the added amino acids of the starting materials into the porous hierarchical structures could enhance the conductivity of the disordered carbon matrix by changing the structure of the electron cloud to improve the performance in the energy storage application. The Fe3O4@N/C as the anode material of Li-ion batteries (LIBs) showed a remarkable property of lithium storage at about 1200 mA h g−1 after 350 cycles at 1 A g−1. Meanwhile, the material as the anode material of Na-ion batteries (SIBs) exhibited a high capacity of up to 236.4 mA h g−1 and 176 mA h g−1 at 5 A g−1 and 10 A g−1. Our work provides a convenient strategy to relieve the volume changes of the electrode materials to achieve better electrochemical performance for Li+/Na+ ion electrochemical energy storage.

Fe3O4@Au@SiO2 Core–Shell Nanoparticles: Synthesis,  Characterization, Investigations of Its Influence on Cell Lines Using  a NIR Laser and an Alternating Magnetic Field

Abdallah Rusul Mohammed,Al-Haddad Raad M. S.

Core–shell nanoparticles (CSNPs) have attracted attention in biomedical applications as they have highly useful materials with modified characteristics, such as high stability, dispersibility, higher permeability to certain target cells and reduction in consumption of precious materials. Synthesis of core–multishell nanoparticles with suitable sizes, structural characteristics and absorption using simple methods continues to be a challenge. In this study, \({\text{F}\text{e}}_{3}{\text{O}}_{4}@\text{A}\text{u} @{\text{S}\text{i}\text{O}}_{2}\)  CSNPs were synthesized in three stages to control their size and the potential for tuning their properties. Field emission scanning electron microscope images confirmed that \({\text{F}\text{e}}_{3}{\text{O}}_{4}@\text{A}\text{u} @{\text{S}\text{i}\text{O}}_{2}\) CSNPs have a small particle size of about 22.5 nm, average crystalline size in X-ray diffractometer analysis was 22.8 nm, stability was about − 49.1 mV, and synthesis with magnetic and optical properties improved their biocompatibility. Treatment of CAL-51 and HBL-100 cell lines by \({\text{F}\text{e}}_{3}{\text{O}}_{4}@\text{A}\text{u} @{\text{S}\text{i}\text{O}}_{2}\)  CSNPs under NIR laser and alternating magnetic field generated enough heat to increase cell death.

Promoting the stability and adsorptive capacity of Fe3O4-embedded expanded graphite with an aminopropyltriethoxysilane–polydopamine coating for the removal of copper(II) from water

Shunhui Wang,Wenjian Lao,Yi He,Heng Shi,Qihang Ye,Jing Ma

In this study, three magnetic graphites, namely, EGF, GAF, and GFA + KH550, were prepared, which were loaded either with Fe3O4 or with Fe3O4 and PDA or with Fe3O4, PDA, and KH550 onto expanded graphite. ATR-FTIR, XRD, XPS, SEM, TEM, and TGA characterization results showed that EGF, GAF, and GFA + KH550 were successfully prepared. Under the same initial copper concentration, the removal rates of copper ions by EGF, GFA, and GFA + KH550 were 86.2%, 96.9%, and 97.0%, respectively and the hazard index reductions of the three adsorbents were 2191 ± 71 (EGF), 1843 ± 68 (GFA), and 1664 ± 102 (GFA + KH550), respectively. Therefore GFA + KH550 exhibited better removal of Cu(II) than EGF and GFA, for PDA and KH550 provided more adsorption-active sites like –OH and –NH. Here, the adsorption of GFA + KH550 fitted the pseudo-second-order kinetic and Langmuir models well within the testing range, which means that adsorption occurs on a monolayer surface between Cu(II) and the adsorption sites. The intraparticle diffusion model and various thermodynamic parameters demonstrated that Cu(II) was adsorbed on GFA + KH550 mainly via external surface diffusion and that the process was both endothermic and spontaneous. Recycling experiments show that GFA + KH550 has a satisfactory recyclability, and the way of direct recovery by magnets exhibits good magnetic induction. GFA + KH550 was applied in lake water and artificial seawater samples, and exhibited better removal of copper than that in DI water under the same environmental conditions for the existence of macromolecular organic matter. Furthermore, the adsorption capacity of copper ions was not relative to the salinity of water. The application of GFA + KH550 demonstrated the potential for application in water treatment procedures.

A sensitive colorimetric sensor based on one-pot preparation of h-Fe3O4@ppy with high peroxidase-like activity for determination of glutathione and H2O2

Wei Yang,Chenyuan Weng,Xiaoyun Li,Hongliang He,Jianwen Fei,Wei Xu,Xiaoqiang Yan,Wanying Zhu,Hongsong Zhang,Xuemin Zhou

At present, artificial mimic enzyme has become a powerful substitute for natural enzyme. In particular, the biosensors based on nano-enzymes have been the focus of current research. Herein, a novel magnetic ternary nanocomposite hemin-Fe 3 O 4 @polypyrrole (h-Fe 3 O 4 @ppy) was synthesized by chemical oxidation polymerization. The results showed that the h-Fe 3 O 4 @ppy had stronger peroxidase activity than Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) and h-ppy NPs, and was indicated by Michaelis-Menten constant (K m ) and maximum initial velocity (V max ). Therefore, we used h-Fe 3 O 4 @ppy catalyzing H 2 O 2 to oxidize the chromogenic substrate TMB, and built Hydrogen peroxide (H 2 O 2 ) and Glutathione (GSH) colorimetric biosensors with the help of signal intrinsic exponential amplification and easy operation. The controllable catalysis was realized by h-Fe 3 O 4 @ppy which was prone to separation. The method of removing h-Fe 3 O 4 @ppy by magnetic separation effectively eliminated the effect of residual catalysis when terminating the reaction. The sensor was then applied to the determination of GSH in biological samples from acute coronary syndrome patients. The linear ranges of H 2 O 2 and GSH were 0.2–100 μM and 0.5–80 μM, respectively. The detection limits of H 2 O 2 and GSH are 0.18 μM and 0.15 μM, respectively. This research not only proposes a new type of nanoenzyme, but also shows the multiple advantages of magnetic nano-enzymes for the construction of biosensors.

Desert beetle-like microstructures bridged by magnetic Fe3O4 grains for enhancing oil-in-water emulsion separation performance and solar-assisted recyclability of graphene oxide

Yong Xu,Gang Wang,Lijing Zhu,Wanshun Deng,Chunting Wang,Tianhui Ren,Baikang Zhu,Zhixiang Zeng

Owing to its high selective adsorption and excellent cyclability, superwetting materials have attracted considerable attention in environmental governance, especially oily wastewater treatment. However, the inferior separation efficiency and high recovery energy consumption seriously limit the actual application of superwetting particles in oil–water emulsion separation. Herein, inspired reversely by the water collection and water retention of the hydrophilic/superhydrophobic structure on the Stenocara beetle’s back, we fabricated magnetic graphene oxide composite with beetle-like microstructure by one-step solvothermal and environmentally friendly ball milling method. Magnetic composite with superhydrophobic/superoleophilic bumps–hydrophilic underlayer exhibits high hydrophobicity/oleophilicity in air and high oleophobicity underwater. In the process of particle assembly, the Fe 3 O 4 grains with abundant oxygen vacancies peeled off from the in-situ deposited magnetic Fe 3 O 4 microspheres play a bridging role to immobilize the superhydrophobic carbon black particles on the graphene oxide (GO) surface. On the unique surface of magnetic composite, attributed to strong π–π/n–π interface adsorption and hydrophobic interaction, the oil–water separation can be rapidly demulsified and the superoleophilic bumps (superhydrophobic carbon black nanoparticles) can capture and aggregate tiny oil droplets. The hydration layer formed in the hydrophilic region effectively prevents the captured oil droplets from spreading on the composite structure, thus enhancing the emulsion separation ability of magnetic GO. More importantly, the prepared composites exhibit efficient recycling and regeneration under solar irradiation, which is superior to the recovery efficiency of traditional GO sheets lacking high self-heating components. These inverse beetle-like magnetic GO-based particles open up a new opportunity for the design and fabrication of advanced demulsifiers in the field of oil–water emulsion separation.

Application of core–satellite polydopamine-coated Fe3O4 nanoparticles–hollow porous molecularly imprinted polymer combined with HPLC-MS/MS for the quantification of macrolide antibiotics

Wenjia Fan,Dan Yang,Nan Ding,Puyu Chen,Lei Wang,Guanwei Tao,Feng Zheng,Shunli Ji

Core–satellite-structured magnetic nanosorbents (MNs) used for the selective extraction of macrolide antibiotics (MACs) were prepared in this study. The MNs (core–satellite polydopamine-coated Fe3O4 nanoparticles–hollow porous molecularly imprinted polymer) consisted of polydopamine-coated Fe3O4 nanoparticles (Fe3O4@PDA) “core” linked to numerous hollow porous molecularly imprinted polymer (HPMIP) “satellites” with bridging amine functional groups. It is worth mentioning that HPMIPs act as “anchors” for selectively capturing target molecules. Polymers were characterized using TEM, SEM, FT-IR, VSM, and TGA and applied as magnetic dispersive solid-phase extraction (MDSPE) sorbents for the enrichment of trace MACs from a complex food matrix prior to quantification by HPLC-MS/MS. Nanocomposites revealed outstanding magnetic properties (36.1 emu g−1), a high adsorption capacity (103.6 μmol g−1), selectivity (IF = 3.2), and fast kinetic binding (20 min) for MACs. The multiple advantages of the novel core–satellite-structured magnetic molecularly imprinted nanosorbents were confirmed, which makes us believe that the preparation method of the core–satellite MNs can be applied to other fields involving molecular imprinting technology.

Preparation and characterization of boron nitride nanosheet ferric oxide composite (BNNS@Fe3O4) through the double stabilization of PVP and its adsorption to congo red

Yang Jiafei,Shang Jingqi,Chen Jiewei,Xue Feng,Ke Zunye,Zhang Xiangfen,Ding Enyong

In this study, a simple method was used to synthesize a new type of magnetic composite material BNNS@ Fe 3 O 4 . In the PVP aqueous solution, the h-BN surface was exfoliated by a high-pressure homogenizer to obtain a few layers of BNNS. Then FeCl 3 ·6H 2 O and hydrazine hydrate were added for reduction treatment, and deposited Fe 3 O 4 nanoparticles on the surface of BNNS. PVP can not only stabilize a few layers of BN, but also promote the formation of Fe 3 O 4 . Through SEM, TEM, XRD, XPS and other characterization methods, the composition and surface morphology of the composite material were determined. Furthermore, the adsorption of Congo red by the composite material was explored. The removal rate of Congo Red by composite of BNNS @ Fe 3 O 4 (0.1) was 39% after 12 h reaction at 323 K. But adsorption capacity also increased with time, when the time was extended to 48 h, its maximum removal rate of Congo Red was 83% and the adsorption capacity was 499 mg/g at 313 K. The adsorption kinetics and thermodynamics of the composite material for Congo red at 313 K were studied. The adsorption process was more consistent with the pseudo-second-order kinetic equation. The composite nanoparticles can move directionally under the action of a magnetic field, which also has potential application value in thermal conductivity.