APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Kun-Kun Lu,Xiu-Feng Song,Lian-Hua Xu,Wen-Li Xin,Dan Shan
Design and synthesis of highly effective catalysts for electrochemical oxygen reduction reaction (ORR) with low cost is of great significance due to the purpose of energy conversion and storage. Herein, we report a facile solvothermal method to prepare ultrafine cobalt phosphide (CoPx)-doped Co-based zeolitic imidazole framework (CoPx/ZIF-67). The one-pot synthesis of CoPx/ZIF-67 involves an oxygen-free sealed room-temperature reaction, in which the high chemical activity of rich defect sits in 2D black phosphorus quantum dots (BPQDs) endows edge-selective coordination /reduction of Co ions. Carbonization of CoPx/ZIF-67 at 800 °C can produce CoPx-N-doped porous carbon composites (CoPx-NPC). The as-prepared CoPx-NPC retains the intrinsic morphology of rhombic dodecahedrons, similar to that of NPC derived from ZIF-67. The ultrafine CoPx doping causes chemical and electronic modulation and offers more active electrocatalytic sites etc., so that CoPx-NPC possesses enhanced ORR performance in terms of positive onset-potential (∼−0.06 V vs. SCE), large diffusion limiting current density (−4.703 mA cm −2 ), high stability, as well as the accelerated reaction kinetics.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Zhe Tu,Hongxiang Ou,Yining Ran,Honglai Xue,Fang Zhu
The synthesis of a multifunctional flame retardant that combines flame retardancy, smoke suppression, and toughening effects is essential for expanding the range of applications for polyolefins. Inspired by the superhydrophobicity and low surface energy due to the lotus leaf micro/nano hierarchical structure, in this paper, we constructed 2D-3D heterogeneous ZIF-67@MMT by growing ZIF-67 in situ on the surface of montmorillonite (MMT) layers using wet chemistry. Mismatch engineering and micro/nano-graded heterogeneous structure confer high dispersibility and a high specific surface area on MMT, thus optimizing the pore structure and catalytic activity. Polypropylene (PP) composites with 25 wt% intumescent flame retardant (IFR) and 3 wt% ZIF-67@MMT achieved a 32.1 % limiting oxygen index and a UL-94 V-0 rating. 3ZIF-67@MMT/IFR/PP showed a 93 %, 86 %, and 66 % reduction in peak heat release rate, total smoke production, and CO production, respectively. In addition, ZIF-67@MMT has good interfacial compatibility and mechanical interlocking with PP. The tensile strength and elongation at break of 3ZIF-67@MMT/IFR/PP were increased by 58 % and 64 %, respectively, compared to 2MMT/IFR/PP. This work provides an effective strategy for the design of multifunctional heterogeneous nanomaterials for fire safety and other potential applications.
研究领域:
材料科学
·
火灾安全工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Mei Wan,Congling Shi,Lei Chen,Lei Deng,Yueping Qin,Honglei Che,Jingyun Jing,Junyi Li,Xiaodong Qian
Ammonium polyphosphate (APP) is the most commercially valuable phosphorus-based flame retardant, but poor interaction with the polymer interface limits the flame-retardant efficiency. In this work, a new type of multi-layered nanomaterial coating APP (APP-PEI@MXene@ZIF-67) was prepared and introduced into thermoplastic polyurethane (TPU) polymers by a simple and green assembly strategy. The effects of different loading shells of modified APP on the flame retardancy of TPU composites were investigated, as well as their gas/condensed phase thermal degradation products and their flame-retardant mechanisms. The results showed that APP-PEI@MXene@ZIF-67 was more favorable for catalytic char formation than APP, and the residual char formed by its composites was denser and more continuous. Compared with the pure TPU, the pHRR, THR, pSPR, and TSP of TPU/APP-PEI@MXene@ZIF-67–2BL composites were decreased by 72.75 %, 87.25 %, 59.58 %, and 85.97 %, respectively, which significantly reduced the heat and smoke release during the combustion process. The gas-phase and condensed-phase flame retardant mechanisms synergized to construct a possible approach to address the fire risk and heat/smoke hazards of TPUs and promote the extensive application of TPU polymers.
研究领域:
材料科学
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高分子科学
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消防安全工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Qing Fu,Xuhuai Fu,Jinzhou Feng,Jing Wang,Jinyu Jiang,Shijia Ding,Daobin Han,Manxia Wang
Neuromyelitis optica spectrum disorder (NMOSD) is a central nervous system demyelinating disease that typically causes severe visual impairment and paralysis, and the aquaporin-4 antibodies (AQP4-IgG) serve as its specific diagnostic marker. In patients presenting with typical NMOSD symptoms, a positive AQP4-IgG result is sufficient to confirm the diagnosis. However, current clinical methods for detecting AQP4-IgG suffer from limited sensitivity, time-consuming procedures, and labor-intensive workflows, underscoring the urgent need for more efficient and reliable diagnostic approaches. To address these limitations, we report a novel electrochemical biosensor leveraging a hierarchical ZIF-67@PDA@PtCu nanozyme for ultrasensitive and rapid AQP4-IgG detection. ZIF-67@PDA@PtCu, a composite material consisting of a ZIF-67 core coated with polydopamine (PDA) and further decorated with PtCu nanoparticles, was utilized as a signal amplification component. The PtCu alloy nanoflowers demonstrated exceptional catalytic activity, which was further amplified by the sturdy ZIF-67 framework that enabled the integration of additional functional materials. In parallel, PDA enhanced the synergy between the unsaturated edge sites of the metal-organic framework and the outstanding catalytic properties of the PtCu alloy, thereby boosting the overall performance of the system. The integration of graphene oxide (GO) and gold nanoparticles (AuNPs) enhanced electrical conductivity. This configuration enabled efficient electrochemical (EC) signal generation, facilitating the detection of AQP4-IgG with high stability, a broad detection range of 0.1–80 U mL −1 , and an impressively low detection limit of 0.05 U mL −1 . Our findings offer a novel approach for the early diagnosis of NMOSD and provide valuable insights into the detection of other antibody-dependent neuroimmune disorders.
研究领域:
免疫学
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神经病学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yuqing Chai,Xuan Zhou,Gang Yuan,Wei Wang,Jingjing Zhang
ZIF-67-C 5 H 4 IN/MWCNT composites were successfully synthesized by doping 4-Iodopyridine (C 5 H 4 IN) and integrating multi-walled carbon nanotubes (MWCNT) IN cobalt dimethylimidazole (ZIF-67) via solvothermal and self-assembly methods. The composite was drop-cast on a glassy carbon electrode (GCE) for non-enzyme glucose detection IN alkaline media. The incorporation of C 5 H 4 IN modulated the three-dimensional metal-organic framework (MOF) structure of ZIF-67 and improved the molecular permeability, whereas the MWCNTs improved the electrical conductivity. As a result, the sensor offers excellent performance with a low limit of detection (LOD) of 0.78 μM, a linear range of 0.18–1.98 mM, and a sensitivity of 1033 μA mM −1 cm −2 . In addition, the sensor offers excellent stability, reproducibility and selectivity for common interferences.
研究领域:
分析化学
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生物传感器
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纳米材料
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电化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Hong-Hong Wang,Jia Liu,Juan Chen
With the increasing demand for lipase inhibitors and novel anti-obesity therapies, it is of paramount importance to screen Candida rugosa lipase (CRL) inhibitors from traditional Chinese medicines (TCMs) as anti-obesity drugs. Immobilized enzyme screening technology combined with capillary electrophoresis has become a powerful tool for the exploration of CRL inhibitors due to its easy separation characteristics and high separation efficiency. In this work, tannic acid (TA)-modified ZIF-67 was adopted as a readily available carrier for CRL immobilization. ZIF-67 was fabricated by mixing Co(NO 3 ) 2 ·6 H 2 O with 2-methylimidazole under ambient conditions. TA was subsequently introduced to chelate the surface metal ions of ZIF-67, yielding a ZIF-67/TA hybrid carrier. CRL was then immobilized onto the ZIF-67/TA via physical adsorption. The immobilization of CRL on TA-modified ZIF-67 minimally alters its conformation, enabling 98.7 % recovery of enzymatic activity. Additionally, it exhibits a high CRL loading capacity of 36.5 mg·g⁻¹ determined by the Bradford protein assay. The ZIF˗67/TA/CRL demonstrated notable improvements in thermal resistance, operational durability, recyclability, and storage performance. Its calculated Michaelis constant ( K m ) was determined to be 1.41 mM, while the half-maximal inhibitory concentration (IC 50 ) of orlistat against the system was measured to be 19.74 µM. Finally, capillary electrophoresis was employed to evaluate CRL inhibitions across 18 TCMs, identifying Schisandrae Chinensis Fructus as the most potent CRL inhibitor. This investigation not only presents an innovative strategy for discovering lipase inhibitors and prospective anti-obesity agents, but also underscores the therapeutic potential of TCMs in metabolic disorder intervention.
研究领域:
生物化学
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酶学
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药学
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纳米技术
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药物发现
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中医药学
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生物催化
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yipu Xu,Wenru Zhao,Rui Chen,He Li,Xinyu Liu,Peiran Wu,Hui Yu,Jiansong Wang,Liu-Liu Shen,Gui-Rong Zhang,Donghai Mei
Zeolitic imidazolate frameworks (ZIFs) are widely explored as precursors for constructing electrocatalysts for the oxygen reduction reaction (ORR). However, most studies convert these frameworks into metal-nitrogen-carbon (M-N-C) catalysts via pyrolysis, a process that often compromises their structure integrity and coordination precision. Herein, it is demonstrated that ZIF-67 can serve directly as a highly-active molecular catalyst for ORR. By applying ball-milling to enhance cobalt sites exposure, the optimized ZIF-67 exhibits exceptional ORR activity in alkaline media. Combined spectroscopic and theoretical analyses reveal that this remarkable activity stems from coordinatively unsaturated Co-N 4-x sites, which transform into Co-N 4-x (OH) moieties under reaction conditions, thereby facilitating oxygen adsorption and activation. Furthermore, mild thermal treatment (≤500 °C) enhances the proportion of Co-N 4-x sites up to 48%, as confirmed by X-ray absorption spectroscopy, achieving ORR activity rivals or even exceeds conventional pyrolyzed M-N-C catalysts. This study unlocks the potential of ZIFs as active molecular electrocatalysts upon mild thermal treatment, providing a scalable and efficient strategy for optimizing ZIFs for catalytic applications while preserving their structural precision.
研究领域:
材料科学
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电化学
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催化
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纳米技术
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
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IF 6.216
Gui-lin Zhuang,Yi-fen Gao,Xiang Zhou,Xin-yong Tao,Jian-min Luo,Yi-jing Gao,Yi-long Yan,Pei-yuan Gao,Xing Zhong,Jian-guo Wang
Herein we report a facile bottom-up strategy to prepare highly dispersed supported Co 3 O 4 on N-doped Porous Carbon (NPC). Specifically, ZIF-67 (ZIF = Zeolitic Imidazolate Frameworks) microcrystals firstly grow on benzoic acid modified covalent organic framework (BFC), resulting in ZIF-67/COF composite. Subsequently, highly dispersed Co 3 O 4 /NPC was obtained via the calcination of ZIF-67/COF. Interestingly, high dispersion of supported Co 3 O 4 is dominated by homogeneous distribution of benzoic acid auchoring on nanoporous COF . More notably, largely triggered by the porosity and confining effect of COF , the resultant Co 3 O 4 /NPC features highly active crystal plane and a large specific surface area of 228.0 m 2 /g. Furthermore, the oxygen evolution reaction (OER) measurement results demonstrated that highly dispersed Co 3 O 4 /NPC features good catalytic activity (330 mV overpotential at 10 mA.cm −2 , 79 mV.dec −1 Tafel slope and mass activity of 130 A.g −1 at overpotential of 400 mV) and durable stability, superior to currently available counterparts. Moreover, Li-ion battery (LIB) tests also showed high reversible capacity (785 mA.h.g −1 at 500 mA.g −1 ) as well as excellent cycling stability and rate performance. Furthermore, Density functional theory (DFT) calculation results demonstrated that these superior OER properties can be attributed to the geometrical and electronic effects of Co 3 O 4 /NPC on activation and adsorption/desorption of reaction species.
研究领域:
材料科学
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电化学
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纳米催化
·
能源存储
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Mohammad Nazari Kalojeh,Roghayeh Hassanpour Sabet,Mir Ali Farajzadeh,Mohammad Reza Afshar Mogaddam,Elnaz Marzi Khosrowshahi,Mustafa Tuzen
A dispersive solid phase extraction procedure was established for the extraction of some pesticides from fruit juices and then it was combined with dispersive liquid-liquid microextraction for more enrichment of the analytes. For this purpose, 40 mg of zeolitic imidazolate framework-carbon dot composite was dispersed into the sample solution as the sorbent via vortex agitation. After that, the sorbent was collected by centrifugation and the supernatant was wasted. Then, 1 mL of a water-soluble organic solvent (acetone) was added onto the sorbent as the elution solvent. After desorption of the analytes from the sorbent surface, the eluate was mixed with a water-immiscible organic solvent (1,1,2-trichloro-1,2,2 trifluoroethane) at µL-level (45 µL) and the mixture was quickly injected into 5 mL deionized water. The resulting cloudy mixture was centrifuged and 1 µL of the sedimented phase was injected into a gas chromatography-flame ionization detection system. After the optimization of the method, its validation was evaluated. The data showed that the limits of detection and quantification obtained by this method were in the ranges of 0.22–0.72 and 0.73–2.40 ng mL −1 , respectively. The plotted calibration curves were linear in the range of 0.73–1000 µg L −1 for all analytes. High enrichment factors (375−445), and extraction recoveries (75–89%), and negligible matrices effect were obtained for the investigated analytes by the introduced method. Also, the obtained data showed that all samples were free of the analytes.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Rui Guo,Xinyu Liu,Tianyi Dong,Jinsong Li,Zuju Shu,Zhongbo Li,Lijun Zhang
Rhodamine B (RhB) is a synthetic organic xanthene dye that is harmful to human health. RhB can easily be illegally added to food as a colorant due to its cheap and abundant. This work presents a molecularly imprinted (MIP) electrochemical sensor for the determination of RhB by modifying ZIF-67-derived N-doped carbon composite interconnected by MWCNTs (NC@MWCNT) and MIP on the surface of glassy carbon electrode. The sensor exhibited excellent performance for RhB detection due to the outstanding conductivity of NC@MWCNT and the specific adsorption of MIP. Under optimized conditions, the sensor had a wide linear response range (0.001–1000 nM) and a low detection limit of 1 pM. The sensor exhibits remarkable selectivity and can distinguish RhB molecules from dye molecules with similar structures and common metal ions. This work introduces a simple, economical, sensitive, and selective electrochemical detection method for RhB trace detection.
研究领域:
分析化学
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食品科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 27
·12387-12398
·
IF 2.7
Yafeng Jin,Fangming Han,Tao Wang,Haofu Shi,Xiaobo Li,Li Yang,Na Chen,Kaifeng Yang,Xinyue Song,Guangri Xu
Developing a facile and effective assay method is crucial due to the potential harm of metronidazole (MNZ) antibiotics to both human health and the environment. Herein, snowflake-shaped poly(3-thiophenemalonic acid, 3-TPA) combined with a carbonized core–shell-type ZIF-8@ZIF-67 (C-ZIF-8@ZIF-67) hollow polyhedra modified glassy carbon electrode (GCE), denoted as C-ZIF-8@ZIF-67/P3TPA/GCE, was fabricated by electropolymerization followed by the electrodeposition strategy. The resulting sensor demonstrates a significant electrocatalysis effect for the reduction reaction of MNZ, exhibiting a broad linear range (0.1–20, 20–800 μM) with a low limit of detection (LOD, 3S/N) of 0.024 μM. Furthermore, it has been successfully applied to determine MNZ in tablets and lake water. A synergistic effect between P3TPA and C-ZIF-8@ZIF-67 is elucidated through density functional theory (DFT) calculations. Consequently, this research introduces a sensitive and effective method for monitoring MNZ in real samples.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 63
·36114-36122
·
IF 2.936
Hailin Guo,Yifan Wang,Chaofeng Li,Keqing Zhou
In this work, sandwich-like structured CoAl-LDH@ZIF-67 hybrids were constructed by in situ growth of nanosized ZIF-67 crystallites on CoAl-LDH nanoplates. The structure and morphology of CoAl-LDH@ZIF-67 hybrids were represented by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR) and Transmission Electron Microscopy (TEM). Accordingly, the hybrids were introduced into epoxy resins to explore their effect on the thermal and fire safety properties of epoxy composites. With the introduction of 2% CoAl-LDH@ZIF-67 hybrids, the T10%, T50% and Tmax values were decreased to some extent and the char residue yield was higher than that of pristine epoxy. The peak heat release rate (PHRR) of epoxy composites declined by 26.4%, in comparison with those of pure epoxy. Moreover, the quantity of smoke produced, toxic CO released and CO2 produced were suppressed markedly and decreased by 16.7%, 59.8% and 32.2%, respectively. A possible mechanism for improving fire safety was put forward based on the analysis of the carbon residues.
研究领域:
材料科学
·
聚合物工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）