Materials Today Chemistry
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2024
·
IF 6.7
Shihong Lin,Bingyan Chen,Ying Xu,Zhiyu Li,Yuanrong Liao,Jun Wang,Peiyan Yu,Yang Zhang
Synergistic surface-enhanced Raman spectroscopy (SERS) substrates, leveraging the combined strengths of electromagnetic enhancement (EM) and chemical enhancement (CM), have been extensively explored in the literature. In this study, we introduce a distinctive approach to fabricating core@shell structures, specifically employing silver nanowire @ zeolite imidazole framework-8 (AgNW@ZIF-8) as synergistic SERS substrates. Notably, these substrates offer meticulous control over shell thickness through a straightforward post-synthesis procedure. Utilizing Ag nanowires as the plasmonic core, selected for their broader localized surface plasmon resonance (LSPR) absorption range compared to nanoparticles , we encapsulate them within ZIF-8, a metal-organic framework (MOF) recognized for its proficient charge transfer (CT) properties. Our investigation encompasses the SERS performance across various Raman-active molecules, considering their diverse sizes and distinct frontier molecular orbitals (FMO) energy levels. Additionally, we systematically explore the influence of alterations in shell thickness on SERS outcomes and scrutinize the impact of probe orientation. This comprehensive study not only advances the understanding of synergistic effects intrinsic to MOFs-metal SERS substrates but also provides valuable insights for the rational design of highly sensitive substrates tailored for practical applications.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Dandan Yan,Min Li,Chunxiang Qian
Phase change materials are used in cementitious materials to reduce the hydration temperature rise and thus inhibit the temperature cracks generation. However, the influence mechanism of phase change materials on the hydration properties of cementitious materials is still unclear. In this study, ZIF-8-based composite phase change materials (CPCM) were added to the Portland cement (PC) clinker-anhydrite (C$)-calcium sulfoaluminate (CSA) cement ternary system (PCCSA) in the form of admixtures. The effects of controlling the phase change temperatures, dosages of CPCM and hydration temperatures on the hydration exothermic characteristics, hydration products and the compressive strength development in the PCCSA composite system were investigated. CPCM addition reduced the hydration exothermic rate and cumulative heat release of the ternary system, especially when the phase change temperature of CPCM was 25.8 ℃, and the larger the dosage, the more obvious the reduction effect. In addition, CPCM did not participate in the hydration reaction of the system, but promoted the formation of CH and AFm. Simultaneously, the compressive strength of the PCCSA system paste containing CPCM decreased due to increased porosity in the paste. Furthermore, elevated hydration temperature significantly improved the hydration rate of the system, while reduced the hydration degree, and the hydration products types of the system were not affected by the hydration temperatures. This study results are fundamental for predicting the hydration behavior of cement systems containing CPCM and promoting the application of composite phase change materials in cementitious materials.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaoqian Meng,Rui Gao,Ming Zheng,Xin Zhou,Xianfa Zhang,Xiaoli Cheng,Yingming Xu,Shan Gao,Lihua Huo
Real-time monitoring of chlorine gas (Cl 2 ) with a strong irritating odor is an indispensable means of avoiding its contamination of the air and harm to the body. To achieve this purpose, a novel gas-sensitive material capable of detecting low concentrations of Cl 2 at near room temperature is developed in this paper. ZIF-8 with a kinetic diameter of 3.4 Å in the designed ZnO@ZIF-8 composites is able to sieve gas molecules with different kinetic diameters, enabling effective improvement of the selectivity of the gas-sensitive materials. In addition, the porous structure of ZIF-8 can provide more reactive sites, which is conducive to improving gas adsorption capacity and providing of channels for gas diffusion. In this study, ZnO@ZIF-8 heterojunction composites are prepared by combining the advantages of ZnO and ZIF-8, which provides a new method for real-time monitoring of low concentrations of Cl 2 , and also has potential practical applications in fields such as environmental monitoring and industrial safety.
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Asia-Pacific Journal of Chemical Engineering
·
2024
·
IF 1.4
Guihua Yang,Jiali Chen,Linxue Yang,Rui Wang
Cu-based catalysts applied in ethynylation reaction of formaldehyde for 1,4-butynediol synthesis has been widely concerned. The activity and stability of Cu-based catalyst is still a challenging task in this field. Here, Cu–Zn catalysts derived from ZIF-8 are prepared by a coprecipitation method and applied in ethynylation reaction of formaldehyde. All catalysts were characterized through thermogravimetric, x-ray diffraction, N 2 physical adsorption–desorption, transmission electron microscopy, H 2 -temperture-programmed reduction, x-ray photoelectron spectroscopy, and Raman and Fourier transform infrared analysis. The effect of calcination temperature of ZIF-8 on the catalyst structures and ethynylation performances are all investigated. The results show that CuO 5h -ZnO 400 catalyst has the best catalytic activity, with a formaldehyde conversion of 98% and 1,4-butynediol selectivity of 100%. It is mainly due to the presence of highly dispersed and small particle CuO. Moreover, CuO 3h -ZnO 400 catalyst prepared by optimized conditions can further improve the stability in ethynylation reaction due to more carbon species on the surface of ZnO. The more carbon contents in Cu–Zn catalyst contribute to the ethynylation activity and stability due to the interaction between Cu and C species favoring Cu 2 C 2 formed. In addition, the ethynylation reaction mechanism catalyzed by Cu–Zn catalyst is illustrated carefully. The Cu–Zn catalysts derived from ZIF-8 can provide some ideas for the application in ethynylation reaction of formaldehyde for 1,4-butynediol synthesis.
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EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Qi Tao,Hang Yao,Zehao Gu,Xiaofei Yang,Junli Shi,Dong-An Wang,Hui Chong
The treatment of chronic wounds are characterized by a local tissue with issues such as the accumulation of free radicals and persistent inflammation, which contribute to delayed wound healing. Thus, it has emerged as a significant global challenge, profoundly impacting patients’ quality of life and even posing threats to their lives. In this study, we fabricted a CCM (Curcumin)–Co-ZIF-8 nanoparticle (CCZ)@oxidized ammonium alginate (OSA)/carboxymethyl chitosan (CMCS)/tannic acid (TA) composite multifunctional bioactive hydrogel. This nanocomposited double-crosslinked network hydrogel dressing exhibits excellent mechanical properties and self-healing abilities. Additionally, the hydrogel shows good biocompatibility. Due to the formation of dynamic Schiff base bonds between oxidized sodium alginate and CMCS, the hydrogel-TA spray system possesses injectability upon applied to a wound model in mice, allowing better adaptation to irregular wound shapes. Furthermore, it could promote synergistic antibacterial, antioxidant, and anti-inflammatory effects, thereby accelerating wound healing. Our findings highlight the potential of this multifunctional hydrogel system as an advanced therapeutic option for chronic wound management.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tiantian Min,Jin Yue,Chuanxiang Cheng,Xiaoyun Ma,Shihan Weng,Yuwan Luo,Yujie Lei,Yangyang Long
Developing stimuli-responsive on-demand release systems is very important to effectively suppress microbial infections and excessive food decomposition. However, the commonly designed controlled release systems with a single responsiveness cannot accurately response to environmental changes in food packaging scenarios. Herein, a pH/enzyme dual-responsive active packaging was fabricated based on in situ growth of ZIF-8 nanoparticles (ZIF-8 NPs) on TEMPO-oxidized cellulose (TOCNF) film and loading with carvacrol (CAR), after that electrostatic adsorbing pectin as “gatekeeper” for fruit preservation. The developed CAR@ZIF-8/TOCNF/Pec film was able to respond to acidic condition and pectinase produced by microorganisms in the case of fungal infections during food storage, thus possessing a dual-responsive controlled-release function. The release rate of CAR reached approximately 86.83 ± 1.82 % at pH = 5.0 and reached 88.65 ± 1.86 % in the presence of pectinase (1.0 mg/mL) after 168 h. In addition, the CAR@ZIF-8/TOCNF/Pec film performed superior inhibition efficacy against Escherichia coli, Staphylococcus aureus , and Aspergillus niger . The CAR@ZIF-8/TOCNF/Pec film were highly effective in preserving the freshness of fungus-inoculated raspberries and mangoes, and inhibited the spread of fungal spores during storage for 5 and 7 days, respectively. Therefore, this work provided a promising, smart and eco-friendly strategy for on-demand and precise release of bioactive ingredients during food storage and preservation.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Zhidong Jin,Jinbo Zhao,Lin Liu,Fei Liu,Dewen Zhao,Zhou Wang,Fenglong Wang,Jiurong Liu,Yue Mou,Lili Wu
Realizing nitrogen dioxide (NO 2 ) detections based on semiconductor-based gas sensors with high tolerance to humidity conditions is deemed to be a long-term challenge. To independently acknowledge the physiosorbed-water influence mechanism on semiconductor-based sensors, hydrophobic zeolitic imidazolate framework-8 (ZIF-8) covered chemisorbed-oxygen-nonexistence zinc hydroxyfluoride (ZnOHF) snowflake-like nanorod bundles are synthesized for NO 2 detections with non-hindrance of interfering gases and high humidity in our work. Gas-sensing testing results display that the 0.6ZIF-8/ZnOHF-based gas sensor provides an optimum NO 2 response of 12.1–10 ppm NO 2 at the operating temperature of 200 ℃ with excellent NO 2 selectivity. As the relative humidity (RH) increases from 20% RH to 80% RH, the response of the 0.6ZIF-8/ZnOHF sensor shows a marginal fluctuation of only 13%, exhibiting outstanding anti-humidity characteristics towards NO 2 detections, the outperformed NO 2 selectivity and humidity tolerance of which are greatly attributed to the unique band structures of ZnOHF and the surficial hydrophobic treatment by ZIF-8, which is further validated via In-situ diffuse reflection infrared Fourier transform spectroscopy ( In-situ DRIFTS) and electronic structure analyses. Humidity impact on ZnOHF poses a persuasive evidence for establishing the separate physiosorbed water interfering mechanism on semiconductors. This work endows a perspective on optimizing humidity tolerance for semiconductor-based sensors at low operating temperature.
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MATERIALS CHEMISTRY AND PHYSICS
·
2024
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IF 4.3
Yugao Guo,Xueqiang Zhang,Jingwen Qiao,Menghan Guo,Xinling Bai,Ruonan Tian,Dengke Ji
In this paper, polyaniline (PANI) material was prepared by in-situ polymerization and mixed with zeolitic imidazolate frameworks (ZIF-8) to prepare PANI/ZIF-8 by surface modification. The light cured epoxy resin (RJ313) was modified by PANI/ZIF-8, and the PANI/ZIF-8/RJ313 anticorrosive coating was prepared. The chemical cross-linking of ZIF-8 with the epoxy resin can improve the cross-linking density and barrier property of the epoxy coating, thus improving the corrosion resistance of the coating. The encapsulation of PANI in ZIF-8 not only maintains the corrosion resistance of PANI, but also strengthens the dispersion of PANI under the action of ZIF-8 and improves the mechanical strength of the coating. A series of tests, such as the polarization test and electrochemical impedance test, proved that PANI/ZIF-8/RJ313 coating strongly affects 304SS acid corrosion resistance compared with RJ313, ZIF-8/RJ313 and PANI/RJ313. In 0.5 mol L −1 sulfuric acid solution, the corrosion current I corr of this coating attached to 304SS was as low as 0.0308 μA·cm −2 , and the impedance value can reach 37971.00 Ω·cm 2 . This provides a new idea for improving the dispersibility and corrosion resistance of other anti-corrosion materials.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Dandan Yan,Min Li
The cement solidification method serves as an effective approach for the immobilization of heavy metal-containing waste. However, Cr(VI), a highly toxic substance, is inadequately stabilized and solidified within cement pastes, posing a significant risk of leaching. This study innovatively incorporated nano-porous nitrogen-doped carbon (NC), derived from ZIF-8 through carbonization, into the cement containing heavy metals for collaborative disposal mixing with K 2 CrO 4 (HMC-Cr). Subsequently, the hydration behavior, mechanical properties, and solidification mechanism of Cr(VI) in the composite cement pastes were examined. The experimental results revealed that, compared to ZIF-8, NC demonstrated significantly greater positive impacts on the hydration kinetics, compressive strength, and Cr(VI) immobilization capabilities of HMC-Cr cement. Compared with pure HMC-Cr pastes, the 28-day compressive strength of HMC-Cr/NC increased by 16.7 %, and the leaching concentration of heavy metal Cr decreased by 52.5 %. The HMC-Cr/NC pastes exhibited superior Cr(VI) solidification capacity, attributed to the appropriate pore size, excellent nucleation effect, and reduction properties of NC. The primary immobilization forms of Cr in HMC-Cr/NC pastes included CrO 4 2- -AFm, Cr(OH) 3 , and coordination structures involving C-NH. Consequently, NC nanomaterials derived from ZIF-8 serve as effective additives for enhancing the stable immobilization of Cr(VI) in the cement solidification treatment of heavy metal-containing waste.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Huanhuan Li,Yu Wu,Xorlali Nunekpeku,Yuhan Yang,Jingsa Zhao,Wei Sheng,Yuexia Wang
The increasing presence of Aflatoxin B 1 (AFB 1 ) residues in food continues to raise significant public health concerns. Herein, we designed an upconversion-based sensor integrated into an alginate-polyacrylamide (SA-PAM) hydrogel for on-site AFB 1 detection in food. First, core-shell upconversion nanoparticles (CSUCNPs) with enhanced fluorescence were modified with complementary DNA (cDNA), forming signal probes known as CSUCNPs-cDNA. Simultaneously, NH 2 -ZIF-8@Cu 2+ with a high surface area and specific affinity for aptamer was synthesized using a one-pot method. This was then modified with an AFB 1 -specific aptamer, forming the capture probe Apt-ZIF-8@Cu 2+ . Using base pairing, CSUCNPs-cDNA and Apt-ZIF-8@Cu 2+ were hybridized into sensing probes (CSUCNPs-ZIF-8@Cu 2+ ), which were embedded into SA-PAM hydrogels as stable sensor carrier. Furthermore, the SA-PAM hydrogel showed a reduced swelling ratio of 1.68–1.80 in water and phosphate buffer solution(s) (PBS), which improves stability. In the presence of AFB 1 , the aptamer selectively binds the AFB 1 , increasing electrostatic repulsion between CSUCNPs-cDNA and Apt-ZIF-8@Cu 2+ . This disrupts Förster resonance energy transfer (FRET), resulting in a pronounced “signal-on” fluorescence. This sensor achieves AFB 1 diffusion through the SA-PAM hydrogel, FRET disruption and upconversion signal stabilization within 18 min, faster than traditional methods. Under optimized conditions, the sensor exhibited a clear linear correlation between fluorescence intensity and the logarithm of AFB 1 concentration ranging from 0.1 to 100 µg/kg ( R ² = 0.994), with a detection limit as low as 0.08 µg/kg. Besides, its performance was further validated through tests on spiked wheat, corn, peanut, and water, demonstrating high accuracy and reproducibility with relative standard deviation (RSD) below 3.63 % and recoveries of 85.88–98.04 %.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zikang Li,Guangyao Fan,Muning Chen,Qin Shen,Shenzhen Cong,Roberto Castro-Muñoz,Dongyang Li,Jing Wang,Yatao Zhang
By combining the advantages of polymers and porous nano-fillers, mixed matrix membranes (MMMs) have demonstrated outstanding gas separation performance. However, the ideal matching between polymers and nano-fillers is still a challenge especially under high filler loading conditions. To address this interfacial challenge, an in-situ grown amino-functionalized ZIF-8 (NH 2 -ZIF-8) is embedded in 6FDA-DAM to prepare MMMs. Compared to ZIF-8, NH 2 -ZIF-8 not only can enhance compatibility and interfacial adhesion because of the extensive hydrogen bonding, but also effectively modulates its structural flexibility by increasing the rigidity of Zn–N bonds within the ZIF-8 framework. The enhanced framework rigidity of NH 2 -ZIF-8 successfully improves the CO 2 /CH 4 separation capability of the MMMs. Under a high filler loading of 30 wt%, the CO 2 /CH 4 selectivity of the optimized NH 2 -ZIF-8/6FDA-DAM MMMs reached 35.1 and the permeability reached 1225.9 Barrer, which increased by 25.36 %, and 8.94 % respectively compared to the ZIF-8 MMMs, exceeding the 2008 Robeson upper bound. Molecular simulations further reveal the enhanced diffusion selectivity of NH 2 -ZIF-8 and the strong interactions between surface –NH 2 groups and electron-rich O/F heteroatoms in the 6FDA-DAM polyimide matrix. These simulations quantitatively elucidated the critical role of interfacial structure in determining gas separation performance. The mechanistic insights provided in this study offer valuable theoretical guidance for the development of high-performance membrane materials for CO 2 capture and gas purification applications.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-9
·
IF 5.3
Zeng Zhaobin,Wang Haibin,Cai Chongming,Xiang Lin,Zhou Haohuan,Xie Ziyi,Guo Bangming
Methods based on photoelectrochemical immunoassay have been utilized for the quantitative monitoring of neuron-specific antigen (NSE) with neuroblastoma patients, but most provide only low sensitivity. In this contribution, a simple and feasible photoelectrochemical immunoassay based on ZIF-8-derived double-shelled hollow ZnS nanocages (ZnS NCs) was applied to the split-type photocurrent measurement of NSE in biological fluids, accompanied by an enzyme-catalyzed system for synergistic amplification. Glucose oxidase (GOx)-labeled anti-NSE secondary antibody was utilized to form a sandwiched immunoreaction on capture antibody-coated microplate, whereas ZnS NCs with strong and stable photocurrents were employed to generate the detectable photocurrent. Subsequently, GOx catalyzed the glucose substrate to produce hydrogen peroxide, thereby causing the change in the photocurrent of double-shelled hollow ZnS nanocages. Followed by optimizing experimental conditions, the photoelectrochemical immunoassay displayed good photocurrent responses within the dynamic range 1.0–10000 pg mL −1 at a low detection limit of 0.59 pg mL −1 NSE. Good reproducibility and high specificity were acquired for determination of NSE standards. Such a highly favourable analytical performance could be achieved even in human serum samples at different dilutions.
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