Journal of Materials Chemistry A
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2024
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IF 10.7
Lulin Hu,Weiyan Yu,Jian Liu,Yi Yang,Jingcheng Hao,Lu Xu
Aqueous magnetic gels normally fabricated by embedding inorganic magnetic particles into organic hydrophilic polymeric networks have been well-established for various potential applications, but developing their counterparts that barely comprise inorganic magnetic particles and water remains an appealing challenge in light of the underlying preponderances in facile preparation, high safety, eco-friendliness and good stability under strong irradiating conditions. In addition, although aqueous magnetic gels have been exploited for numerous industrial and biomedical purposes, there have been few reports on aqueous magnetic gels for tribological applications. Herein, we illustrate magnetic gels simply prepared from binary mixtures of composite Fe3O4 nanoparticles and water. The aqueous gels can provide ultralow friction and wear for steel/ZrO2 interfaces even under very high load-bearing conditions owing to the tribochemical reactions of the magnetic nano-gelator. They show excellent self-healing capacity either upon alternately changing external shear strains or cutting. Considering the advantages of their organic scaffold-free nature, the gels possess inherent low cytotoxicity, flame retardancy, chemical degradability and irradiation resistance that contribute to minimizing their health risks, safety concerns, environmental burdens and stability issues under harsh conditions. Our study may provide new insights into the design and preparation of novel inorganic-based smart soft materials for nanotechnology, sustainable engineering and colloidal chemistry.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Shumei Wang,Caixia Chen,Fang Han,Xiaoying Zhou,Benxia Li
Heterogeneous catalysts composed of transition metal oxides and carbon-based materials have displayed significant potential in persulfates activation for the elimination of diverse refractory organic pollutants . Herein, the nitrogen-doped porous carbon (N-pC) nanosheets supported well-dispersed Fe 3 O 4 nanoparticles (Fe 3 O 4 /N-pC) were meticulously designed and fabricated. This fabrication process involved the creation of Fe 3+ /(CN@PDA) precursor through loading polydopamine-Fe 3+ complex on graphitic carbon nitride (g-C 3 N 4 ) and the following calcination process, resulting in in-situ formation of Fe 3 O 4 nanoparticles on the N-pC nanosheets that were derived from polydopamine coated g-C 3 N 4 . The large specific surface area , coupled with accessible Fe 2+ /Fe 3+ species, facilitated the synergy of adsorption and catalysis, enabling the rapid elimination of antibiotics via peroxydisulfate (PDS) activation. The optimal Fe 3 O 4 /N-pC catalyst demonstrated a remarkable efficacy in the degradation of tetracycline-hydrochloride (TC), reaching a quasi-first-order kinetic constant of 0.1479 min −1 , which was 1.95 times that of the degradation reaction using g-C 3 N 4 (0.0758 min −1 ). Mechanistic investigations revealed that both radicals (·O 2 - ,·OH and SO 4 · - ) and non-radical ( 1 O 2 and electron transfer) oxidation pathways were involved in TC degradation. The toxicities of degradation intermediates were assessed through a bean-sprout planting experiment and the quantitative structure-activity relationship (QSAR) analysis. This work offers some guidance on the preparation and application of heterogeneous catalysts for effectively removing organic contaminants from water.
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PHYSICA SCRIPTA
·
2024
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IF 2.6
Siyi Xu,Danyi Li,Wenrui Wang,Lin Lin,Ying Sun,Jihao吉豪 Li李,Linfan Li
In recent years, there has been significant interest in using two-dimensional MoS2 to enhance flame retardancy, which has proven challenging. MoS2@Fe3O4 nanosheets were successfully synthesized via a one-step method called radiation reduction to boost MoS2's flame retardant properties. Incorporating these MoS2@Fe3O4 nanocomposites notably improved the flame retardancy of ethylene vinyl acetate copolymer (EVA). Compared to pure EVA, EVA nanocomposites with 1 part of MoS2@Fe3O4 showed a 17.4% reduction in peak heat release rate, 40.4% decrease in total heat release, and 52.9% reduction in total smoke release, with scaly residue content improving from 0.4% to 12.6%. Additionally, MoS2@Fe3O4 incorporation enhanced the mechanical and friction properties of EVA composites, increasing tensile strength by 25.7% and elongation at break by 10.4% compared to pure EVA. This study presents an effective and simple method for producing modified MoS2 nanosheets that enhance flame retardancy, as well as mechanical and friction properties of EVA composites.
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MINERALS ENGINEERING
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2024
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IF 4.9
Shurong Shi,Lihua Gao,Junhong Zhang,Zhijun He
A systematic study of the preparation and metallurgical properties of magnesia flux pellets was used to elucidate the mechanism for oxidation and consolidation occurring during oxidative roasting. The compressive strength of the finished pellets was 3545 N/P. With sufficient basicity and MgO contents, magnetite (Fe) x [Fe] 2 O 4 and maghemite γ-Fe 2 O 3 with spinel-type crystal structures combined with MgO/CaO to form nonstoichiometric Mg x Fe 1-x Fe 2 O 4 (0 < x < 1) and Ca y Fe 1-y Fe 2 O 4 (0 < y < 1). With higher basicity and MgO contents, the participation of CaO/MgO was the driving force for gradient conversion from olivine Fe 2 SiO 4 to olivine Mg x Ca 2-x SiO 4 . The CaO/MgO combined with magnetite (Fe) x [Fe] 2 O 4 and maghemite γ-Fe 2 O 3 to form stable (Ca, Mg) x Fe 1-x Fe 2 O 4 , CaFe 2 O 4 and CaFe 3 O 5 , thereby inhibiting recrystallization of the pellets and resulting in poorer metallurgical properties of the magnesia flux pellets.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 9
·7539-7550
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IF 2.324
Sui Mingxu,Sun Xiaodong,Lou Hongfei,Li Xiaopeng,Lv Xuliang,Li Ling,Gu Guangxin
Hollow Fe 3 O 4 particles with variable crystal sizes were synthesized by one-step solvothermal method for lightweight and efficient microwave absorber applications. The reactant concentration, reaction temperature and reaction time are three key factors for morphology control of the products and can further influence the microwave absorption properties. The diameters of as-prepared hollow magnetite particles ranged from 200 to 1000 nm, while the shell thickness differed from 35 to 280 nm. It is found that the microwave absorption properties are improved along with the increasing of the hollow structure size which depend on the reaction conditions. The sample prepared at 200 °C for 36 h exhibited an optimal reflection loss of − 55.14 dB at 11.76 GHz with the thickness of 2.07 mm, while possessing the broadest effective bandwidth reaching 4.72 GHz (5.6–10.32 GHz) at 2.49 mm. The excellent microwave absorbing properties of such materials can be attributed to the high magnetic loss and favorable impedance matching property.
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Journal of Materials Chemistry B
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2024
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IF 6.1
Dong Mo,Wei Cui,Linxin Chen,Juanjuan Meng,Yuting Sun,Kaiyong Cai,Jixi Zhang,Jianrong Zhang,Kui Wang,Xiaohe Luo
Hepatic ischemia-reperfusion injury (IRI) is a common pathological process during hepatectomy and liver transplantation and the two primary reasons for hepatic IRI are reactive oxygen species (ROS)-mediated oxidative stress and excessive inflammatory responses. Herein, a novel antioxidant nanodrug (A-MPDA@Fe3O4@PVP) is prepared by employing L-arginine-doped mesoporous polydopamine (A-MPDA) nanoparticles as the carrier for deposition of ultra-small ferric oxide (Fe3O4) nanoparticles and further surface modification with polyvinylpyrrolidone (PVP). A-MPDA@Fe3O4@PVP not only effectively reduces the aggregation of ultra-small Fe3O4, but also simultaneously replicates the catalytic activity of catalase (CAT) and superoxide dismutase (SOD). A-MPDA@Fe3O4@PVP with good antioxidant activity can rapidly remove various toxic reactive oxygen species (ROS) and effectively regulate macrophage polarization in vitro. In the treatment of hepatic IRI, A-MPDA@Fe3O4@PVP effectively alleviates ROS-induced oxidative stress, reduces the expression of inflammatory factors, and prevents apoptosis of hepatocytes through immune regulation. A-MPDA@Fe3O4@PVP can further protect liver tissue by activating the PPARγ/NF-κB pathway. This multiplex antioxidant enzyme therapy can provide new references for the treatment of IRI in organ transplantation and other ROS-related injuries such as fibrosis, cirrhosis, and bacterial and hepatic viral infection.
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BIOSENSORS & BIOELECTRONICS
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2012
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IF 5.602
Kun Shang,Jianying Zhu,Xiaomeng Meng,Ziqiang Cheng,Shiyun Ai
A novel electrochemical immunosensor for ultrasensitive detection of subgroup J of avian leukosis virus (ALVs-J) was designed by using graphene sheets (GS)-layered double hydroxides (LDHs) composites modified electrode with multifunctional Fe 3 O 4 core/Ni–Al LDHs shell (LDHs@Fe 3 O 4 ) nanospheres as labels. At first, the GS-LDHs were used for the immunosensor platform for improving the electronic transmission rate as well as increasing the surface area to capture a large amount of primary antibodies (Ab 1 ). After that, ferrocene (Fc), secondary antibodies (Ab 2 ) and horseradish peroxidase (HRP) multifunctional LDHs@Fe 3 O 4 nanospheres were used as labels with high load amount and good biological activity. Subsequently, in presence of H 2 O 2 , amplified signals were obtained by an electrochemical sandwich immunoassay protocol. To embody the signal amplification property of the protocol, the analytical properties of various immunosensor platform and labels were compared in detail. Under optimal conditions, the reduction peak currents of the electrochemical immunosensor were proportional to the ALVs-J concentration over the range from 10 2.32 to 10 5.50 TCID 50 /mL with a low detection limit (180 TCID 50 /mL, S/N=3). The resulting immunosensor also displayed a good selectivity, reproducibility and stability.
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TALANTA
·
2025
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IF 6.1
Lijun Wang,Jiangchuan Tang,Shanshan Ren,Haixia Hu,Xiao Yang,Xianggui Chen
Although many colorimetric methods have been developed for on-site pesticide detection, most exhibit low sensitivity and limited resistance to interference. To address these issues, this study developed a novel dual-mode colorimetric-ratiometric fluorescence method for isocarbophos (ICP) detection using sulfur and nitrogen co-doped carbon nanodots (S, N-CDs) to inhibit catalytic Fe 3 O 4 @Cu-BTC nanozyme activity. The synthesized Fe 3 O 4 @Cu-BTC nanozymes with higher peroxidase-like activity were inhibited by S, N-CDs. The inhibitory mechanism was deeply investigated and was ascribed to (1) the restriction of the reaction between Fe 3 O 4 @Cu-BTC and hydrogen peroxide (H 2 O 2 ), which decreased the ·OH production, and (2) the ·OH scavenging ability of the S, N-CDs, forming the basis of the dual-mode method. The Fe 3 O 4 @Cu-BTC/Apt-complementary strand (CS)/S, N-CDs hybridization complexes demonstrated minimal to no peroxidase-like activity, preventing H 2 O 2 from oxidizing o -phenylenediamine (OPD) to produce yellow fluorescent 2,3-diaminophenazine (DAP). Meanwhile, the detection system demonstrated a low fluorescence intensity ratio (I 575 /I 465 ) at an excitation wavelength of 390 nm. However, the presence of ICP caused the CS/S, N-CDs to separate from the Fe 3 O 4 @Cu-BTC/Apt due to the high affinity between Apt and ICP. Then, the Fe 3 O 4 @Cu-BTC/Apt-ICP complexes recovered peroxidase-like activity, which promoted DAP production, accompanied by a pronounced fluorescence intensity ratio (I 575 /I 465 ). In optimum conditions, the detection limits (LODs) were 2.79 ng/mL (colorimetric) and 0.26 ng/mL (ratiometric fluorescence), respectively. The feasibility of the proposed method was verified via three spiked samples, yielding recovery rates of between 86.08 % and 112.64 %, indicating the significant potential for the highly sensitive, accurate on-site detection of ICP in actual samples.
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FOOD CHEMISTRY
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2024
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IF 8.5
Jing Zeng,Wenqin Wu,Xiao Chen,Shenling Wang,Huimin Wu,Ahmed A. El-Kady,Amnart Poapolathep,Alejandro Cifuentes,Elena Ibañez,Peiwu Li,Zhaowei Zhang
As emerging contaminants, microplastics threaten food and environmental safety. Dibutyl phthalate (DBP, released from microplastics) and benzo[ a ]pyrene (BaP, adsorbed on microplastics) coexisted in food and the environment, harming human health, requesting a sensitive and simultaneous testing method to monitor. To address current sensitivity, simultaneousness, and on-site portability challenges during dual targets in complex matrixes, CuCo 2 S 4 /Fe 3 O 4 nanoflower was designed to develop a smartphone-assisted photoelectrochemical point-of-care test (PEC POCT). The carrier transfer mechanism in CuCo 2 S 4 /Fe 3 O 4 was proven via density functional theory calculation. Under optimal conditions, the PEC POCT showed low detection limits of 0.126, and 0.132 pg/mL, wide linearity of 0.001–500, and 0.0005–50 ng/mL for DBP and BaP, respectively. The smartphone-assisted PEC POCT demonstrated satisfied recoveries (80.00%–119.63%) in real samples. Coherent results were recorded by comparing the PEC POCT to GC–MS (DBP) and HPLC (BaP). This novel method provides a practical platform for simultaneous POCT for food safety and environment monitoring.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Honglin Qin,Lizhen Qiao,Chen Li,Xiuchao Yao,Bingyan Han
In this work, a novel composite Fe 3 O 4 /NiAl LDH/MIL-125 (Ti) was developed through modifying the Ti-based MOF into magnetic NiAl LDH materials and applied to efficiently extract organophosphorus flame retardants (OPFRs) from water samples. The prepared Fe 3 O 4 /NiAl LDH presented good extraction efficiency for OPFRs, and, electrostatic interaction and π-π interaction also played an important role for the extraction process, except for the selective metal-affinity coordination between the adsorbents and OPFRs. Some key factors influencing the magnetic solid-phase extraction efficiency were explored, including adsorbent amount, ultrasound time, solution pH, salt content, the type of elution solvent and eluent volume. Under the optimal conditions, the coefficients of determination (R 2 ) of the OPFRs were 0.9976–0.9996, and the limits of detection (S/N = 3) and limits of quantification (S/N = 10) were respectively 0.3–1.0 μg·L −1 and 1.0–3.0 μg·L −1 . The developed approach was applied for the extraction and determination of OPFRs in the environmental water samples, and the spiked recoveries ranged from 82.79 % to 111.32 %.
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TALANTA
·
2024
·
IF 5.6
Zi-Yu Li,Jia-Hui Zhu,Jie Zhao,Xiao-Shuai Yang,Yu-Shen Liu,Ting Cheng,Yan-Xin Chen,Shu-Yang Sun,Lu-Liang Wang
Magnetic solid-phase extraction (MSPE) technology for tetracycline (TCC) was developed by employing the novel and pre-designed Fe 3 O 4 –COOH@hydrogen-bonded organic frameworks (HOFs) adsorbents in complex food samples. The HOF shell was grown onto the Fe 3 O 4 –COOH core by in-situ self-assembled method. The excellent MSPE performances with less solvent, less adsorbent and time consumption were derived from the hydrogen bonding, π-π and hydrophobic interactions between HOF shell and TCC. Combined with HPLC analysis, Fe 3 O 4 @ HOFs adsorbent reduced matrix effects and the established MSPE-HPLC method for TCC gave the linearity of 0.001–6 μg mL −1 with the limit of detection 0.0003 μg mL −1 . The recoveries in pure milk, canned yellow peach and carrot were 82.4–103.7 %. The method provided a simple, efficient and dependable alternative to monitor trace TCC antibiotics in food or environmental samples.
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Foods
·
2025
·Vol. 14
·期 14
·2421
·
IF 5.1
Mengqiong Yang,Guangming Mei,Daoxiang Huang,Xiaojun Zhang,Pengfei He,Si Chen
A sensitive method was developed for detecting diazepam residues in aquatic products using magnetic dispersive solid-phase extraction (MDSPE) coupled with ultra-performance liquid chromatography–tandem mass spectrometry (UPLC-MS/MS). Samples extracted with 1% ammonia–acetonitrile were purified using synthesized Fe3O4@SiO2-PSA nanoparticles via MDSPE before UPLC-MS/MS analysis. Separation was performed on a C18column with gradient elution using 0.1% formic acid–2 mM ammonium acetate/methanol. Detection employed positive electrospray ionization (ESI+) in multiple reaction monitoring (MRM) mode. Characterization confirmed Fe3O4@SiO2-PSA’s mesoporous structure with excellent adsorption capacity and magnetic properties. The method showed good linearity (0.1–10 μg/L,r> 0.99) with an LOD and LOQ of 0.20 μg/kg and 0.50 μg/kg, respectively. Recoveries at 0.5–15.0 µg/kg spiking levels were 74.9–109% (RSDs 1.24–11.6%). This approach provides rapid, accurate, and high-precision analysis of diazepam in aquatic products, meeting regulatory requirements.
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