查找使用阿拉丁产品的科研文献

Multilayered Fe3O4@(ZIF-8)3 combined with a computer-vision-enhanced immunosensor for chloramphenicol enrichment and detection

Puyue Liu,Yiming Dong,Xiaoxuan Li,Yu Zhang,Zhi Liu,Yingying Lu,Xuewen Peng,Ruifang Zhai,Yiping Chen

The misuse and overuse of chloramphenicol poses severe threats to food safety and human health. In this work, we developed a magnetic solid-phase extraction (MSPE) pretreatment material coated with a multilayered metal – organic framework (MOF), Fe 3 O 4 @ (ZIF-8) 3 , for the separation and enrichment of chloramphenicol from fish. Furthermore, we designed an artificial-intelligence-enhanced single microsphere immunosensor. The inherent ultra-high porosity of the MOF and the multilayer assembly strategy allowed for efficient chloramphenicol enrichment (4.51 mg/g within 20 min). Notably, Fe 3 O 4 @ (ZIF-8) 3 exhibits a 39.20% increase in adsorption capacity compared to Fe 3 O 4 @ZIF-8. Leveraging the remarkable decoding abilities of artificial intelligence, we achieved the highly sensitive detection of chloramphenicol using a straightforward procedure without the need for specialized equipment, obtaining a notably low detection limit of 46.42 pM. Furthermore, the assay was successfully employed to detect chloramphenicol in fish samples with high accuracy. The developed immunosensor offers a robust point-of-care testing tool for safeguarding food safety and public health.

Shaping Phenolic Resin-Coated ZIF-67 to Millimeter-Scale Co/N Carbon Beads for Efficient Peroxymonosulfate Activation

Xin Yan,Yiyuan Yao,Chengming Xiao,Hao Zhang,Jia Xie,Shuai Zhang,Junwen Qi,Zhigao Zhu,Xiuyun Sun,Jiansheng Li

Catalytic performance decline is a general issue when shaping fine powder into macroscale catalysts (e.g., beads, fiber, pellets). To address this challenge, a phenolic resin-assisted strategy was proposed to prepare porous Co/N carbon beads (ZACBs) at millimeter scale via the phase inversion method followed by confined pyrolysis. Specially, p-aminophenol–formaldehyde (AF) resin-coated zeolitic imidazolate framework (ZIF-67) nanoparticles were introduced to polyacrylonitrile (PAN) solution before pyrolysis. The thermosetting of the coated AF improved the interface compatibility between the ZIF-67 and PAN matrix, inhibiting the shrinkage of ZIF-67 particles, thus significantly improving the void structure of ZIF-67 and the dispersion of active species. The obtained ZACBs exhibited a 99.9% removal rate of tetracycline (TC) within 120 min, with a rate constant of 0.069 min−1(2.3 times of ZIF-67/PAN carbon beads). The quenching experiments and electron paramagnetic resonance (EPR) tests showed that radicals dominated the reaction. This work provides new insight into the fabrication of high-performance MOF catalysts with outstanding recycling properties, which may promote the use of MOF powder in more practical applications.

One-dimensional C/Co composite nanofibers derived from ZIF-67 with excellent wideband electromagnetic microwave absorption performance

Danqiang Huang,Xiangyun Zhang,Jianfeng Dai,Zizhou Yuan

The rapid advancement of wireless communications, radar systems, and electronic devices has resulted in a substantial increase in electromagnetic interference (EMI), which poses a threat to electronic device performance and human health. This study addresses the urgent need for lightweight materials with strong absorption capacities, wide absorption bandwidths, and low thickness values. For this purpose, ZIF-67-derived C/Co nanofibers were synthesized via electrospinning, dipping, and high-temperature carbonization. Co 2+ ions were pre-anchored and encapsulated in polyacrylonitrile (PAN) fibers and are grown by immersion in an organic ligand. Utilizing 0.4 g of cobalt nitrate hexahydrate, the amount of encapsulated Co 2+ was optimized to provide the greatest electromagnetic wave absorption performance. Under these conditions, the reflection loss was −49.45 dB, and the maximum effective absorption bandwidth was 6.48 GHz, thereby covering the entire Ku band. The composite material demonstrated a significant improvement in impedance matching and electromagnetic wave dissipation, which was attributed to the uniform dispersion of Co particles and the formation of multi-component heterogeneous interfaces. This study presents a pragmatic method for creating high-performance materials that could potentially reduce electromagnetic interference (EMI) in the aerospace, telecommunications, and defense sectors.

Polyaniline modified bimetallic hydroxide/ZIF composites as electrode materials for supercapacitors with high capacity and high stability

Jinyue Yang,Jianxin Wang,Chunhua Lou,Yuhan Cui,Xin Huang,Haixia Yu,Liming Bai,Wendi Wang,Xinyou Zhang,Hong Pan

Metal-organic framework materials (MOFs) are widely used in electrochemical energy storage due to their abundant active sites and high redox activity. Especially in the field of supercapacitors, the porous structure of MOFs makes them the most promising candidates for composite electrode materials due to their vast specific surface area. However, the poor chemical stability of MOFs in alkaline electrolytes limits their application. Constructing and improving the stability of metal-organic backbone materials through rational structural design is the key to enhancing the electrochemical performance of capacitors. In this paper, the stability of ZIF-67 was enhanced by the complexing with bimetallic hydroxide (CoMn-LDH), and the conductivity is further enhanced by the mixing of polyaniline (PANI) to form a ``network structure'' morphology. As a result, the composite electrode material has a specific capacity of 1048 F g −1 at 1 A g −1 with a good cycle life (80.5 % capacity retention for 5000 cycles). The specific capacity of the CoMn-LDH/ZIF-67/PANI//AC asymmetric supercapacitor (ASC) was 164 F g −1 at 1 A g −1 in the voltage range of 0–1.5 V. The maximum energy density of the ASC was 51.25 Wh kg −1 at a power density of 2250 W kg −1 . In addition, excellent cycling stability (71.2 % capacitance retention after 5000 cycles) was delivered.

Solid-state electrochemiluminescence sensor based on g-C3N4@ZIF-8 for ultrasensitive and specific detection of sulfapyridine

Chao Li,Juan Lu,Yanjia Guo,Jing Wang,Yujia Song,Ruidan Li,Li Tian,Xuwen Li

In this study, a solid-state electrochemiluminescence (ECL) sensor was developed for ultrasensitive and specific detection of sulfapyridine (SPY) using graphitic carbon nitride (g-C 3 N 4 ) as a luminescent reagent. The sensor was fabricated by sequentially coating composite material g-C 3 N 4 @ZIF-8 and Nafion onto the electrode surface. The g-C 3 N 4 , synthesized through high-temperature pyrolysis of melamine, generated a sensitive ECL signal in K 2 S 2 O 8 solution. And g-C 3 N 4 served as a carrier for ZIF-8, with the latter acting as a co-reaction promoter within the g-C 3 N 4 -K 2 S 2 O 8 system, leading to a significant enhancement of the ECL signal. Additionally, molecularly imprinted polymers (MIPs) with SPY were introduced to further enhance the performance of the sensor by specifically recognizing SPY. Under optimal conditions, the prepared ECL sensor showed sensitive measurement of SPY in the linear range of 5.0 × 10 −13  ∼ 5.0 × 10 −8 mol/L, with a detection limit (LOD) of 1.67 × 10 −13 (S/N = 3). The developed MIP-ECL sensor demonstrated good stability, high sensitivity, and reliable reproducibility, thus making it suitable for detecting SPY in real samples.

ZIF-8 based bifunctional coatings with anticorrosive and antibacterial properties: A new design strategy for more efficiency

Wenquan Kong,Maria Serdechnova,Valeryia Kasneryk,Dahai Gao,Hao Wang,Xinyuan Xie,Carsten Blawert,Mikhail L. Zheludkevich,You Zhang

An efficient and simple in-situ/mechanical two-step strategy has been discovered for the fabrication of nanocontainers based on zeolite imidazole framework-8 (ZIF-8) with corrosion inhibitors (benzotriazole, BTA). The nanocontainers were applied in anticorrosive coatings with anticorrosion and antibacterial bifunctions for aluminum alloys AA2024. The effects of ZIF-8 modified with the corrosion inhibitor via different methods (in-situ, mechanical, and two-step strategies) on its morphology, composition, structure, loading/release behavior were studied and discussed. Results showed that the amount of loaded BTA was positively correlated with the crystal size of the final ZIF-8, impacting sustained release. Compared with the conventional primary load (in-situ and mechanical loading way), the two-step loading method (in-situ followed by mechanical treatment) achieved a higher BTA loading without evident ZIF-8 morphology and structure changes. The two-step modified (2-BTA@ZIF-8) powders exhibited good corrosion inhibition and remarkable antibacterial properties against Escherichia coli and Staphylococcus aureus . Additionally, the 1-BTA@ZIF-8 (in-situ strategy), 1-BTA/ZIF-8 (mechanical strategy) and 2-BTA@ZIF-8 composites were dispersed in acrylic resin to prepare anticorrosive and antibacterial bifunctional coatings. Results showed that the 2-BTA@ZIF-8 incorporated acrylic coatings exhibited superior anticorrosion performance and antimicrobial activity compared to the unmodified coating due to the controlled release of BTA. Thus, elaborated strategy represents a feasible and effective way to construct high-performance anticorrosive and antimicrobial coatings with metal-organic framework materials.

ZIF-67-Derived Porous Carbon Nanosheets Decorated with Co Nanoflakes As Bifunctional Electrocatalysts for Overall Water Splitting

Haixia Zhang,Wenyuan Dai,Ru Liu,Junying Xiang,Yanhui Song,Ying Hou,Hong Wei,Peizhi Liu,Bingshe Xu,Jianguo Liang,Junjie Guo

ZIF-67-derived Co–N–C catalysts exhibit efficient water-splitting performance and thus have attracted intense research interest. However, the serious Co agglomeration and loss of most N atoms due to high-temperature pyrolysis limit the further improvement of their electrocatalytic performance. Herein, we report a ZIF-67-derived 2D porous N-doped carbon nanosheet decorated with a Co nanoflake catalyst (Co@NC/CC-500) for OER and HER by a facile pyrolysis method at a low temperature of 500 °C. Benefiting from the ultrahigh N doping (12 atom %) and uniformly dispersed Co nanoflakes on 2D porous carbon nanosheets, which lead to a high content of Co–N active sites, the Co@NC/CC-500 catalyst exhibits outstanding performance toward the HER and OER with overpotentials of 95 and 183 mV at 10 mA cm–2 in 1 M KOH, respectively. Furthermore, the alkaline water electrolyzer using Co@NC/CC-500 as the cathode and anode catalysts can achieve a current density of 10 mA cm–2 at a cell voltage of 1.52 V. This special low-temperature production method may be extensively utilized to create precisely defined monometal or bimetal nanoflakes decorated on 2D porous N-doped carbon nanosheets for diverse electrochemical energy applications.

ZIF-8-Based Nitrogen and Monoatomic Metal Co-Doped Pyrolytic Porous Carbon for High-Performance Supercapacitor Applications

Xiaobo Han,Yihao Geng,Jieni Wang,Shuqin Zhang,Chenlin Wei,Leichang Cao,Shicheng Zhang

Metal–organic frameworks (MOFs) receive wide attention owing to their high specific surface area, porosity, and structural designability. In this paper, ZC-Ru and ZC-Cu electrodes loaded with monatomic Ru and Cu doped with nitrogen were prepared by pyrolysis, ion impregnation, and carbonization process using ZIF-8 synthesized by static precipitation as a precursor. ZC-Cu has a high specific surface area of 859.78 m2g−1and abundant heteroatoms O (10.04%) and N (13.9%), showing the specific capacitance of 222.21 F g−1at 0.1 A g−1in three-electrode system, and low equivalent series resistance (Rct: 0.13 Ω), indicating excellent energy storage capacity and electrical conductivity. After 10,000 cycles at 1 A g−1in 6 M KOH electrolyte, it still has an outstanding capacitance retention of 99.42%. Notably, symmetric supercapacitors ZC-Cu//ZC-Cu achieved the maximum power density and energy density of 485.12 W·kg−1and 1.61 Wh·kg−1, respectively, positioning ZC-Cu among the forefront of previously known MOF-based electrode materials. This work demonstrates the enormous potential of ZC-Cu in the supercapacitor industry and provides a facile approach to the treatment of transition metal.

ZIF-8-Encapsulated Pexidartinib Delivery via Targeted Peptide-Modified M1 Macrophages Attenuates MDSC-Mediated Immunosuppression in Osteosarcoma

Jiabao Dong,Xupeng Chai,Yucheng Xue,Shiyun Shen,Zhuo Chen,Zetao Wang,Eloy Yinwang,Shengdong Wang,Liang Chen,Fengfeng Wu,Hengyuan Li,Zehao Chen,Jianbin Xu,Zhaoming Ye,Xiongfeng Li,Qian Lu

Adoptive cellular therapy is a promising strategy for cancer treatment. However, the effectiveness of this therapy is limited by its intricate and immunosuppressive tumor microenvironment. In this study, a targeted therapeutic strategy for macrophage loading of drugs is presented to enhance anti-tumor efficacy of macrophages. K7M2-target peptide (KTP) is used to modify macrophages to enhance their affinity for tumors. Pexidartinib-loaded ZIF-8 nanoparticles (P@ZIF-8) are loaded into macrophages to synergistically alleviate the immunosuppressive tumor microenvironment synergistically. Thus, the M1 macrophages decorated with KTP carried P@ZIF-8 and are named P@ZIF/M1-KTP. The tumor volumes in the P@ZIF/M1-KTP group are significantly smaller than those in the other groups, indicating that P@ZIF/M1-KTP exhibited enhanced anti-tumor efficacy. Mechanistically, an increased ratio of CD4+ T cells and a decreased ratio of MDSCs in the tumor tissues after treatment with P@ZIF/M1-KTP indicated that it can alleviate the immunosuppressive tumor microenvironment. RNA-seq further confirms the enhanced immune cell function. Consequently, P@ZIF/M1-KTP has great potential as a novel adoptive cellular therapeutic strategy for tumors.

ZIF-derived carbon/BN/CMF composite PCM for enhanced latent thermal storage, photothermal conversion, and thermal insulation

Xiangfei Kong,Ruiming Nie,Jianjuan Yuan

ZIF-Derived Co Nanoparticles Embedded in Pumpkin Seedlike, Hollow N-Doped Carbon Structures for Efficient Microwave Absorption

Xueyun Han,Siyu Zhang,Lei Qiao,Peidong Peng,Chenghao Fu,Ke Liu,Zhongjun Ma

Metal–organic framework (MOF)-derived materials have gained popularity as microwave absorbing materials due to their electromagnetic dissipation advantages. In this study, a special type of MOF (ZIF-L) was used as a precursor; tannic acid was introduced for chemical etching. The resulting material obtained by in situ carbonization was a hollow structure of N-doped carbon embedded by Co nanoparticles (CoHNC), which retained the original pumpkin seed shape but had a hierarchical porous structure on the inside. By adjustment of the amount of cobalt nitrate and the carbonation temperature, the electromagnetic parameters could be altered, improving impedance matching and enabling different microwave absorption properties to be obtained. At 16.96 GHz, the material exhibits an optimal reflection loss of −45.5 dB, an effective bandwidth of 3.04 GHz, and a matching thickness of only 1.4 mm with a material filler of 30 wt %. The microwave loss mechanism is formed by the dual loss mechanism with dielectric loss as the main loss and magnetic loss as the auxiliary one. Therefore, the synthesis of the CoHNC composite through simple etching provides a useful idea for optimizing microwave absorbing materials.

Ultrafine low loading AgCu nanoclusters supported on defective ZIF-8 for the click reaction with high stability

Xinghao Li,Sara Ajmal,Penghui Fang,Xiaoxing Zhou,Maoni Lu,Sichen Li,Ping Chen,Peng Li,Manzhou Zhu

Ultrafine metal nanoclusters have been extensively studied due to their fascinating chemical characteristics. In this work, ultrafine AgCu nanoclusters are synthesized and loaded on the defective ZIF-8 (denoted as AgCu/D-ZIF-8). The findings show that the as-obtained AgCu/D-ZIF-8 catalysts with low AgCu loading (0.387 wt%) exhibit outstanding catalytic performance and recyclability for the reaction of azide–alkyne cycloaddition (click reaction) at 35 °C. Compared with monometallic Ag25/D-ZIF-8 and Cu25/D-ZIF-8 catalysts, bimetallic AgCu/D-ZIF-8 catalysts present exceptional activity for the click reaction. Additionally, AgCu/D-ZIF-8 catalysts display a higher yield of target product for this reaction compared to AgCu/ZIF-8. The experimental results suggest that some defective sites in D-ZIF-8 are occupied by AgCu nanoclusters, which may be key to improving the activity and recyclability of AgCu/D-ZIF-8 catalysts. Consequently, this work provides valuable insights for designing ultrafine bimetallic catalysts with high performance.