ANALYST
·
2020
·Vol. 146
·期 4
·1414-1420
·
IF 3.978
Chuanying Qin,Cong Hu,Aimin Yu,Guosong Lai
Herein, we report a Fe3O4@polydopamine (PDA) nanocomposite and exonuclease III (Exo III)-assisted homogeneous fluorescence biosensing method for ultrasensitive detection of kanamycin (Kana) antibiotic. A hairpin DNA containing the Kana-aptamer sequence (HP) was first designed for the highly specific biorecognition of the target analyte. Because of the aptamer biorecognition-induced structural change of HP and the highly effective catalyzed reaction of Exo III, a large amount of fluorophore labels were released from the designed fluorescence DNA probe. During the homogeneous reaction process, the Exo III-assisted dual recycling significantly amplified the fluorescence signal output. Moreover, the excessive probes were easily adsorbed and separated by the Fe3O4@PDA nanocomposite, which decreased the background signal and increased the signal-to-noise ratio. These strategies result in the excellent analytical performance of the method, including a very low detection limit of 0.023 pg mL−1 and a very wide linear range of six orders of magnitude. In addition, this method has convenient operation, excellent selectivity, repeatability and satisfactory reliability, and does not involve the design and utilization of complicated DNA sequences. Thus, it exhibits a promising prospect for practical applications.
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PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xiaoyu Meng,Ajiao Zhao,Zhonghua Yuan,Kunlin Chen
Multifunctional textiles for thermal management and health protection are gaining attention, as traditional fabrics no longer meet modern demands for comfort, functionality, and safety. To tackle the challenge of achieving both efficient thermal regulation and electromagnetic shielding, Fe 3 O 4 nanoparticles were first surface-modified to obtain a hydrophobic structure. These modified nanoparticles were then used to functionalize chitosan-based phase change microcapsules, which were subsequently combined with graphene and silicone resin to coat cotton fabrics. The resulting coated fabrics demonstrated integrated photothermal control, electromagnetic shielding, and self-cleaning capabilities. SEM analysis confirmed that Fe 3 O 4 nanoparticles were effectively embedded within the microcapsule shells. These microcapsules demonstrated a considerable ability for latent heat storage, effectively absorbing and utilizing visible and near-infrared solar energy. When the microcapsules were blended with graphene to coat the fabric surface, the functional fabric achieved a shielding effectiveness of 35 dB, indicating strong electromagnetic shielding performance. Furthermore, the coated fabric displayed remarkable superhydrophobic behavior, characterized by a contact angle of 152.3° and a rolling angle below 9°. When used outdoors, this functional coated fabric provides a self-cleaning effect, minimizing the impact of environmental pollutants on its photothermal conversion and electromagnetic shielding performances.
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DOI
高影响因子
Gels
·
2025
·Vol. 11
·期 12
·
IF 5.3
Zhenzhen Shan,Xiaoxiong Li,Yalei Li,Yong Wang,Yusen He,Guangyu Sun,Yamin Geng,Guoqing Chang
Lithium–sulfur (Li-S) batteries are renowned for their high theoretical energy density and low cost, yet their practical implementation is hampered by the polysulfide shuttle effect and sluggish redox kinetics. Herein, a sol–gel strategy is proposed to engineer a multifunctional MXene/Fe3O4composite as an efficient mediator for the cathode interlayer. The synthesized composite features Fe3O4nanospheres uniformly anchored on the highly conductive Ti3C2TxMXene lamellae, forming a unique 0D/2D conductive network. This structure not only provides abundant polar sites for strong chemical adsorption of polysulfides but also significantly enhances charge transfer, thereby accelerating the conversion kinetics. As a result, the Li-S battery based on the MXene/Fe3O4interlayer delivers a high initial discharge capacity of 1367.1 mAh g−1at 0.2 C and maintains a stable capacity of 1103.4 mAh g−1after 100 cycles, demonstrating an exceptionally low capacity decay rate of only 0.19% per cycle. Even at a high rate of 1 C, a remarkable capacity of 1066.1 mAh g−1is retained. Electrochemical analyses confirm the dual role of the composite in effectively suppressing the shuttle effect and catalyzing the polysulfide conversion. This sol–gel engineering approach offers valuable insight into the design of high-performance mediators for advanced Li-S batteries.
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
·
IF 1.134
Hong-Ying LIU,Han-Xiao XU,Lang-Lang ZHU,Jia-Jun WEN,Yu-Bin QIU,Chun-Chuan GU,Li-Hua LI
The sodium lignosulfonate (SL) modified Fe 3 O 4 (Fe 3 O 4 -SL) nanoparticles with excellent peroxidase-like activity were prepared by one-step solvothermal method, which were applied to sensing hydrogen peroxide (H 2 O 2 ) and glutathione (GSH) with color change. Firstly, the morphology and composition of Fe 3 O 4 -SL nanoparticles were characterized. The results showed that the synthesized Fe 3 O 4 -SL nanoparticles had a spherical structure with an average diameter of 220 nm. Subsequently, the peroxidase-like activity of Fe 3 O 4 -SL nanoparticles was investigated by catalyzing the formation of blue-colored oxidized TMB (ox-TMB) by 3,3’,5,5’-tetramethylbenzidine (TMB) in the presence of H 2 O 2 . Mechanism studies showed that the Fe 3 O 4 -SL nanoparticles exhibited better catalytic activity than natural horseradish peroxidase (HRP), and the catalytic pathway abode by the ping-pong mechanism. Finally, the colorimetric sensor for H 2 O 2 was established, which had a linear range of 0.5–150 μmol/L, a detection limit of 0.139 μmol/L and good selectivity. In addition, according to the decolorization reaction of ox-TMB and GSH and the scavenging effect of GSH on hydroxyl radicals, a colorimetric GSH sensor was further constructed. Based on the above results, a colorimetric detection platform for GSH was built, by which a detection range of 0.5–25 μmol/L and a detection limit of 0.08 μmol/L were obtained. The results above showed that the colorimetric sensing system constructed here had a wide detection range, good selectivity and stability for detection of GSH, which would provide an important reference in food monitoring, biomolecule detection and other fields.
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高影响因子
Journal of Environmental Sciences
·
2018
·
IF 3.12
Yongpeng Ma,Bailong Mu,Xiaojing Zhang,Hongzhong Zhang,Haomiao Xu,Zan Qu,Li Gao
Hierarchical Ag-SiO 2 @Fe 3 O 4 magnetic composites were selected for elemental mercury (Hg 0 ) removal from non-ferrous metal smelting flue gas in this study. Results showed that the hierarchical Ag-SiO 2 @Fe 3 O 4 magnetic composites had favorable Hg 0 removal ability at low temperature. Moreover, the adsorption capacity of hierarchical magnetic composite is much larger than that of pure Fe 3 O 4 and SiO 2 @Fe 3 O 4 . The Hg 0 removal efficiency reached the highest value as approximately 92% under the reaction temperature of 150°C, while the removal efficiency sharply reduced in the absence of O 2 . The characterization results indicated that Ag nanoparticles grew on the surface of SiO 2 @Fe 3 O 4 support. The large surface area of SiO 2 supplied efficient reaction room for Hg and Ag atoms. Ag–Hg amalgam is generated on the surface of the composites. In addition, this magnetic material could be easily separated from fly ashes when adopted for treating real flue gas, and the spent materials could be regenerated using a simple thermal-desorption method.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 2
·1-13
·
IF 4.3
Zhang Feng,Xu Shuainan,Geng Xiumei,Shan Meixia,Zhang Yatao
Polymers of intrinsic microporosity shows great potential for dye adsorption and magnetic Fe 3 O 4 are easy to be separated. In this work, hydrolyzed polymers of intrinsic microporosity-1/Fe 3 O 4 composite adsorbents were prepared by phase inversion and hydrolysis process for cationic dye adsorption. The chemical structure and morphology of the composite adsorbents were systematically characterized by several characterization methods. Using methylene blue as the target dye, the influences of solution pH, contact time, initial dye concentration, and system temperature on the methylene blue adsorption process were investigated. The incorporation of Fe 3 O 4 particle into hydrolyzed polymers of intrinsic microporosity-1 endow the adsorbent with high magnetic saturation (20.7 emu·g −1 ) which allows the rapid separation of the adsorbent. Furthermore, the adsorption process was simulated by adsorption kinetics, isotherms and thermodynamics to gain insight onto the intrinsic adsorption mechanism. In addition, the composite adsorbents are able to selectively adsorb cationic dyes from mixed dyes solution. Hydrolyzed polymers of intrinsic microporosity/Fe 3 O 4 shows only a slight decrease for methylene blue adsorption after 10 adsorption/regeneration cycles, demonstrating the outstanding regeneration performance. The high adsorption capacity, outstanding regeneration ability, together with simple preparation method, endow the composite adsorbents great potential for selective removal of cationic dyes in wastewater system.
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高影响因子
Journal of Anesthesia
·
2024
·Vol. 38
·期 2
·232-243
·
IF 2.8
Zheng Ling-xi,Yu Qian,Li Qiang,Zheng Chuan-dong
Purpose Lidocaine microspheres can prolong the analgesic time to 24–48 h, which still cannot meet the need of postoperative analgesia lasting more than 3 days. Therefore, we added Fe 3 O 4 to the lidocaine microspheres and used an applied magnetic field to attract Fe 3 O 4 to fix the microspheres around the target nerves, reducing the diffusion of magnetic lidocaine microspheres to the surrounding tissues and prolonging the analgesic time. Methods Fe 3 O 4 –lidocaine–PLGA microspheres were prepared by the complex-emulsion volatilization method to characterize and study the release properties in vitro. The neural anchoring properties and in vivo morphology of the drug were obtained by magnetic resonance imaging. The nerve blocking effect and analgesic effect of magnetic lidocaine microspheres were evaluated by animal experiments. Results The mean diameter of magnetically responsive lidocaine microspheres: 9.04 ± 3.23 μm. The encapsulation and drug loading of the microspheres were 46.18 ± 3.26% and 6.02 ± 1.87%, respectively. Magnetic resonance imaging showed good imaging of Fe 3 O 4 –Lidocain–PLGA microspheres, a drug-carrying model that slowed down the diffusion of the microspheres in the presence of an applied magnetic field. Animal experiments demonstrated that this preparation had a significantly prolonged nerve block, analgesic effect, and a nerve anchoring function. Conclusion Magnetically responsive lidocaine microspheres can prolong analgesia by slowly releasing lidocaine, which can be immobilized around the nerve by a magnetic field on the body surface, avoiding premature diffusion of the microspheres to surrounding tissues and improving drug targeting.
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PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Hongting Ye,Xiaoxing Zeng,Fei Feng,Yuanhang Li,Xiaofeng Gong
ABSTRACT In this study, novel recyclable composite BiOBr/chitin-Fe 3 O 4 was synthesized by a solvothermal method using magnetic chitin chelating bismuth oxybromide (BiOBr) as precursor. The morphology, structure, photoelectric properties and chemical composition of the obtained samples were explored extensively by various characterization techniques. Due to the introduction of Fe 3 O 4 and chitin, the composite BiOBr/chitin-Fe 3 O 4 has multi-functions in enlarging photo response performance, reducing the band gap, increasing specific surface area and inhibiting recombination rate, which are essential to improve the photocatalytic efficiency. Using ciprofloxacin as target pollutant, the composite showed excellent photocatalytic performance under visible light irradiation, the apparent rate constant value of BiOBr/chitin-Fe 3 O 4 is 5.8 times higher than that of pure BiOBr. The composite BiOBr/chitin-Fe 3 O 4 could be recycled and reused conveniently and effectively, and the catalyst possessed good photocatalytic stability with the degradation efficiency remaining unchanged even after five times circle. The possible degradation mechanism was discussed on the basis of experiments.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Fan Zhou,Jiyuan Wang,Yimei Tang,Xuhang Song,Wanrong Zhou,Yan Li,Feng Gao
Rapid and accurate monitoring of glucose concentration is of great significance in clinical diagnosis and treatment of diabetes and hence, it is necessary to develop glucose sensors of superior electro-catalytic capacity. Most literature utilize synergistic effect of nanocomposites to enhance glucose sensing performance, whereas it suffers from crucial restriction in physical and chemical characteristics of each constituents. Morphology of nanostructures significantly affects the electro-catalytic capacity, thus it is a novel route to improve glucose sensing performance to adjust morphology of nanostructures . Herein, we presented highly sensitive non-enzymatic electrochemical sensors for rapid and accurate glucose analysis with hollow Fe 3 O 4 nanospheres (Fe 3 O 4 NSs) of controllable morphologies decorated on flexible fibers. The morphologies of the Fe 3 O 4 NSs were evaluated with quantitative parameters like diameter, roundness , roughness, skewness, and kurtosis acquired from SEM images and image processing algorithms , and their effect on the interfacial characteristics and the electro-catalytic capacity of the glucose sensors was investigated. Owing to the unique spherical nanostructures and superior catalysis, the Fe 3 O 4 NSs exhibit desirable solid/liquid interface for mass diffusion and abundant active sites for sufficient oxidation of glucose. Moreover, much rounder and rougher Fe 3 O 4 NSs of near Gaussian surface are readily produced at a higher Fe 3+ concentration and result in favorable sensing performance. Accordingly, the optimal glucose sensor shows sensitivities of 96.1 ± 5.4 μA mM −1 cm −2 and 38.2 ± 2.2 μA mM −1 cm −2 over a preferable range of 0–18.0 mM, and a lower detection limit of 19.2 μM. Besides, the glucose sensors remain acceptable response after continuous testing for 20 times and repetitive bending for 50 times, and display superior selectivity to glucose and accurate analysis to practical samples. It is a facile and effective methodology to regulate the morphologies of the Fe 3 O 4 NSs for enhanced electro-catalytic capacity of glucose sensors.
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高影响因子
ANALYTICAL BIOCHEMISTRY
·
2015
·
IF 2.219
Chunxiang Zhang,Guangyu Shen,Youming Shen,Xiangyang Zhang
In this work, a novel thiol aromatic aldehyde was synthesized. It can be used as a substrate to directly immobilize antibodies on a gold electrode, for which no additional chemical cross-linker is required. It was also applied as a linker to prepare Fe 3 O 4 @Au/PAMAM/Ab 2 –horseradish peroxidase bioconjugates , which introduced multiple enzymes onto a sensing interface owing to the high surface-to-volume ratio of Fe 3 O 4 @Au nanoparticles and many functional groups of the poly(amidoamine) dendrimer (PAMAM). The introduced multiple enzymes greatly improved the detection signal. Under optimal conditions, the proposed electrochemical immunosensor exhibited desirable performance for detection of IgG in the range 0.005–50 ng ml −1 with a detection limit of 3 pg ml −1 based on a signal-to-noise ratio of 3. It has great potential application in the area of clinical analysis.
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高影响因子
MOLECULES
·
2013
·Vol. 18
·期 11
·14258-14267
·
IF 2.428
Huan Liu,Chao Lin,Zhen Ma,Hongbo Yu,Shenghu Zhou
Fe3O4spheres with an average size of 273 nm were prepared in the presence of CTAB by a solvothermal method. The spheres were modified by a thin layer of SiO2, and then coated by mesoporous SiO2(m-SiO2) films, by using TEOS as a precursor and CTAB as a soft template. The resulting m-SiO2/Fe3O4spheres, with an average particle size of 320 nm, a high surface area (656 m2/g), and ordered nanopores (average pore size 2.5 nm), were loaded with gold nanoparticles (average size 3.3 nm). The presence of m-SiO2coating could stabilize gold nanoparticles against sintering at 500 °C. The material showed better performance than a conventional Au/SiO2catalyst in catalytic reduction ofp-nitrophenol with NaBH4. It can be separated from the reaction mixture by a magnet and be recycled without obvious loss of catalytic activity. Relevant characterization by XRD, TEM, N2adsorption-desorption, and magnetic measurements were conducted.
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高影响因子
Polymer Chemistry
·
2019
·Vol. 11
·期 6
·1177-1187
·
IF 4.76
Yu Yang,Haichao Duan,Siwen Xia,Changli Lü
A novel and convenient method for fabricating homogeneous nanocatalysts with high catalytic activity and controllable reusability is promising for catalytic reduction. In this study, a high-efficiency magnetic recyclable nanocatalyst (PFe3O4@CD@PdNPs) was successfully prepared via depositing highly dispersed palladium nanoparticles (Pd NPs) on a thermo-responsive copolymer support functionalized with superparamagnetic Fe3O4 nanoparticles (NPs) with carbon dots (CDs) as both a stabilizing and reducing agent. The thermo-responsive copolymers with catechol end groups could be facilely anchored onto Fe3O4 NPs (PFe3O4) through a mussel-inspired chemistry strategy. The well-dispersed ultrafine Pd NPs were located on Fe3O4 NPs decorated with copolymer brushes using an episulfide ligand-containing copolymer as a costabilizer. Fourier transform infrared spectroscopy, thermogravimetric analysis and other tests proved that the copolymer brushes were successfully grafted on the surface of the Fe3O4 NPs. Moreover, transmission electron microscopy and X-ray photoelectron spectroscopy confirmed the presence of CDs in the nanohybrids. In addition, the PFe3O4@CD@PdNPs showed interesting thermo-responsive catalytic behaviour because of the presence of thermo-responsive polymer chains on the catalyst surface. Finally, owing to good water dispersibility and the synergistic effect of the Pd NPs with CDs, the PFe3O4@CD@PdNP nanocatalyst possessed higher catalytic activity for the catalytic reduction of different dyes and nitrophenols compared with PdNP@PFe3O4 without CD modification.
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高影响因子
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