PROGRESS IN ORGANIC COATINGS
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2021
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IF 5.161
Chunlin Chen,Guoqing Xiao,Fei Zhong,Shaotang Dong,Zhengwei Yang,Chunyan Chen,Mingtan Wang,Rui Zou
Herein, the ZIF nanoparticles were firstly anchored uniformly on the reduced graphene oxide (RGO) surface, and then a layer of silica was deposited on the surface to avoid the negative impact of the pores generated by the decomposition of the ZIF nanoparticles on the thermal insulation properties. The effect of reduced graphene oxide/zeolitic imidazolate framework-8@silicon oxide (RGO/ZIF@SiO 2 ) hybrids on the fire performance of the coatings was analyzed by big plate experiments, furnace test, and thermal weight loss test. The results showed that the backside temperature of RGO/ZIF@SiO 2 based intumescent fire-retardant coating (IFR) reached the minimum value (173.9 °C) compared to other samples. The expansion characteristics of the coatings were significantly increased by the addition of nanoadditives . By comparison, RGO/ZIF@SiO 2 /IFR composite coating exhibited the largest expansion height (21.5 mm) and expansion rate (16.28). Moreover, the IFR loaded RGO/ZIF@SiO 2 displayed the highest maximum thermal decomposition temperature (T max , 371.1 °C) and residual char (29.8%), indicating its best fire resistance properties. The cone calorimeter test results illustrated that RGO/ZIF@SiO 2 /IFR had the lowest PHRR (482 ± 21 kW/m 2 ), THR (15.57 ± 0.9 MJ/m 2 ), PSPR (0.10 ± 0.01 m 2 /m 2 ), TSP (2.01 ± 0.11 m 2 /m 2 ) and CRR (28.8%) values, indicating its best flame retardant and smoke suppression properties.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Siyu Chen,Xinyu Zhou,Guiying Li,Fang Yang
Metal-organic frameworks (MOFs) have great potential for a wide range of applications given their flexible structures and pore networks. Morphology control directly affects the properties and applications of MOFs. Unfortunately, governing the desired dimension and shape of MOFs is often limited by macrosystems that require organic solvents and additives while including time-consuming treatments. Microfluidics as a practical alternative provides precise manipulation of microscale liquid, has the potential to be a superior platform for directed crystal generation. Here we reported an AC electrokinetic (EK) mixing-assisted micro-synthesis method, which allowed the actively controlled synthesis of MOFs in aqueous phase. The effects of flow rate, molar-ratio of precursors, electric field intensity, and frequency on the synthesis of zeolitic imidazolate framework-8 (ZIF-8) were investigated. Using this method, the particle size of ZIF-8 were varied, and the geometry were changed between flower-like polyhedra, cubes, spheres, and rhombic dodecahedra. Furthermore, the synthesized various ZIF-8 provide different levels of immobilization sites based on their morphological deviations. The flower-like cubic ZIF-8 had defect structures and exhibited a maximum horseradish peroxidase (HRP) loading of about 16%. The study provides a simple, green and reliable tuning strategy for breaking the single morphological form of MOFs to enhance their physicochemical properties.
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JOURNAL OF MATERIALS SCIENCE
·
2023
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IF 4.5
Wang Qing,Qiu Mingyu,Yu Shijuan,Yang Xiaomin,Lao Liqin,Wu Zhiwei,Deng Qianjun,Yu Mingguang
Recently, papers with superhydrophobic surfaces and unique antibacterial and self-cleaning capabilities have attracted great attention due to its potential applications in cold chain logistics packaging. Therefore, a facile and versatile route to fabricate superhydrophobic and anti-bacterial adhesion dual-functional paper was reported. The approach was based on pufferfish-like structured ZIF-8 incorporated cellulose fibers. Specifically, cellulose fibers without any chemical pretreatment were used as templates for the in situ aqueous construction of pufferfish-like structured ZIF-8 with zinc nitrate as zinc source and dimethylimidazole as organic ligand. After paper-making and hydrophobicity treatment, the obtained paper possessed excellent superhydrophobic and anti-bacterial adhesion properties. These surfaces retained their water resistance after 30 finger-wipe cycles and 10 sandpaper abrasions. Moreover, the hydrophobic surface prepared also showed excellent anti-adhesion performance toward bacteria. This strategy route proposed here can significantly reduce or eliminate potential risks associated with various contamination.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2023
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IF 6.1
Yi Ding,Jun Yuan,Feixu Mo,Shuai Wu,Yue Ma,Rongyu Li,Ming Li
Smart metal–organic framework nanocarriers that respond to microenvironmental stimuli related to plant diseases can achieve the on-demand release of active ingredients to control diseases. The plant essential oil citral (CT) has significant biological activity against most pathogens but its poor stability limits its application in the field. To improve the applicability of plant essential oils, we aimed to construct a pH responsive essential oil delivery system (CT@ZIF-8) based on the zeolitic imidazolate framework-8 in this study. The high specific surface area of ZIF-8 enables CT@ZIF-8 remarkable loading capacity, and the metal–organic framework effectively delays the volatilization of CT. The results showed that CT@ZIF-8 was approximately 177 nm in size, had a stable nanostructure, and displayed a high pesticide loading efficiency (15.22%). The photodegradation rate of CT loaded in ZIF-8 under UV irradiation (48 h) was only 17.99%, much lower than that of CT alone (51.18%). The CT@ZIF-8 had a pH-responsive controlled release property, releasing CT from CT@ZIF-8 in a pH-dependent manner. The bioactivity results showed that CT@ZIF-8 had a lower EC50 than CT against three fungi (Magnaporthe oryzae, Botryosphaeria dothidea, and Fusarium oxysporum), enhancing the antifungal activity of CT. After 3 d of reagent treatment, only CT@ZIF-8 maintained good control against rice blast (75.76%) and soft rot (63.69%) infection. We have constructed a smart delivery system for essential oils, which provides a new pathway for the efficient application of plant-derived essential oils in the green control of plant diseases.
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DYES AND PIGMENTS
·
2023
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IF 4.5
Yonghe Zhang,Ruonan Zhou,Jie Sun,Peixuan Li,Deyi Wu,Chunyan Yang,Peng Zhang,Zhenghua Ju
A donor-acceptor (D-A) phenothiazine derivative(PZQ) was designed and synthesized. The PZQ was characterized utilizing infrared (FTIR) and 1 H/ 13 C nuclear magnetic resonance. The fluorescence spectra of PZQ were investigated in various solvents with differing polarities to demonstrate the presence of positive solvatochromism was attributed to the intramolecular charge transfer. It was observed that the Stokes’ shifts increased proportionally with the polarity of the solvents, exhibiting a maximum value of 11420 cm −1 in the highly polar solvent (ACN). Moreover, a porous composite (PZQ@ZIF-8) was fabricated by encapsulating PZQ into the metal-organic framework (ZIF-8) to respond to the organic solvent vapors. The PZQ@ZIF-8 was characterized using infrared, X-ray diffraction (XRD). The fluorescence spectra of the PZQ@ZIF-8 displayed significant solvent-dependent emission. Most importantly, the PZQ@ZIF-8 exhibited high reusability, and a specific response to methanol vapor. The emission intensity of the PZQ@ZIF-8 was correlated with methanol vapor concentration negatively, which was essential for the practical sensing application.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 42
·10234-10251
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IF 7
Feng Sang,Xiao Yang,Jiahui Hao,Yuzhen Wang,Xiaoqin Si,Xujian Li,Luqi Pan,Zhaipu Ma,Changcan Shi
Uncontrollable hemorrhage and subsequent wound infection pose severe threats to life, especially in the case of deep, non-compressible, massive bleeding. Here, a wool keratin/zeolitic imidazolate framework-8 (WK/ZIF-8) composite shape memory sponge is prepared by incorporating ZIF-8 nanoparticles into wool keratin. The combination of keratin and ZIF-8 particles not only reduces the effect of ZIF-8 particles on cell viability but also bolsters the mechanical properties of the keratin sponge and endows it with antibacterial efficacy. Due to the synergistic effect of the excellent hemostatic performance of keratin and Zn2+ release from ZIF-8 nanoparticles, the porous structure suitable for blood cell adhesion and the shape recovery ability of sponges, the WK/ZIF-8 composite sponge exhibits superior hemostatic performance to commercial medical sponges in SD rat and rabbit hemorrhage models. In addition, in vitro and in vivo antibacterial experiments demonstrate the anti-infection activity of the composite sponge. Overall, the WK/ZIF-8 composite sponge provides a promising approach to rapidly control bleeding and promote wound healing.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Zhaoping Hou,Zihan Tian,Junming Zhao,Liangliang Liu,Wanggang Zhang,Zhong Huang,Shaowei Zhang
Metal–organic frameworks (MOFs) have been considered as promising adsorbents for eliminating organic contaminants from wastewater. However, their inherent fragile and particulate form renders them challenging to handle and recycle in practical applications. Herein, millimeter-sized porous mullite beads composed of interlocked mullite whiskers were selected as the substrate materials. ZIF-8 was synthesized in situ on the mullite whisker to create millimeter-sized ZIF-8@porous mullite composite beads. After three cycles of in-situ growth, the ZIF-8 fully enveloped mullite whiskers, forming a homogeneous core/shell structure. Furthermore, the loading mass of ZIF-8 in ZIF-8@Mullite-3 beads reached 22.18 wt%. The BET surface area of the ZIF-8@Mullite-3 porous beads samples is 244.23 m 2 /g. The obtained millimeter-sized ZIF-8@Mullite porous beads exhibited satisfactory adsorption of Congo red (61.29 mg/g) and displayed exceptional reusability and stability. The CR removal efficiency of the ZIF-8@Mullite beads remained above 90%, even after the fifth reuse. The MOFs based beads with enhanced mechanical strength can be recycled and easily handed, highlighting their superiority compared to MOF powders in water treatment applications.
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FISH & SHELLFISH IMMUNOLOGY
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2023
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IF 4.7
Zhiqiang Zhang,Li Wang,Dai Zeng,Xia Ma,Hui Wang
Zeolitic imidazolate framework-8 (ZIF-8) nanoparticles loaded with polysaccharides are excellent drug-delivery carriers with high loading capacity and pH sensitivity. This study describes the one-step encapsulation of Dendrobium huoshanense polysaccharides (DHP) in ZIF-8. The resultant PEG6000/ZIF-8@DHP complex exhibited drug release properties in acidic microenvironments, possessed water solubility, demonstrated high drug loading capacity, and displayed effective encapsulation. The effects of PEG6000/ZIF-8@ DHP administration on immunoregulation, antioxidant activities, and resistance against Aeromonas veronii in channel catfish were assessed. The study revealed that the PEG6000/ZIF-8@DHP complex stimulated cellular proliferation and phagocytosis, while also inducing the production of cytokines and nitric oxide. Additionally, the complex exhibited improved antioxidant properties and increased serum lysozyme and alkaline phosphatase activities. PEG6000/ZIF-8@DHP exhibited efficacy in vivo against Aeromonas veronii infection. These results indicate that PEG6000/ZIF-8@DHP is an efficient immunostimulant and vaccine adjuvant for enhancing immunity in channel catfish.
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PROCESS BIOCHEMISTRY
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2023
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IF 4.4
Ziping Ma,Chunyang Fang
The significant adverse effects and chemoresistance accompanying single-agent chemotherapy reduce its therapeutic effectiveness. The synergistic treatment of osteosarcoma with chemotherapy and photothermal therapy (PTT) has attracted much interest recently due to the improved therapeutic effectiveness of anticancer drugs. In this research, we engineered a new 5-fluorouracil (5FU) by modifying ZIF-8 nanocomposites with polydopamine (PD) and loading them with the drugs. Here, modifying PD prevented the drug's explosive release, enhanced the nanocomposites' biocompatibility, and rendered it more successful at absorbing near-infrared (NIR) light. Excellent photothermal effects were also seen when the PD/5FU@ZIF-8 NCs were exposed to NIR light and employed as a drug-targeted delivery device. In vitro biological tests showed that PD/5FU@ZIF-8 NCs effectively lowered mitochondrial membrane potentials (MMPs) in 143B cells, resulting in death; the addition of photothermal properties improved the anticancer impact and reduced the chemotherapeutic drug dose. In addition, the optimized PD/5FU@ZIF-8 NCs (30 μg/mL) demonstrated enhanced photothermal transformation capability and aided the killing of tumor cells. These findings definitively demonstrate that PD/5FU@ZIF-8 NCs have an additive impact on chemo-photothermal therapy and remarkable biocompatibility; these results have strong potential for preclinical translation for osteosarcoma and other cancer cells.
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INTERNATIONAL IMMUNOPHARMACOLOGY
·
2023
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IF 5.6
Ling Tang,Liyuan Wang,Feng Jin,Yuehan Hao,Tianming Zhao,Wenxu Zheng,Zhiyi He
Intracerebral hemorrhage (ICH) is a cerebrovascular disease. Kallikrein-related peptidase 8 (KLK8) is a serine peptidase, while its role in ICH remains unclarified. Western blot (WB) showed that KLK8 was upregulated in rat perihematomal tissues 24 h following autologous blood injection. KLK8 overexpression aggravated behavioral deficits and increased water content and Fluoro-Jade B (FJB)-positive neuron numbers in brain tissue of rats. Immunofluorescence (IF) assay showed that overexpressed-KLK8 promoted Iba-1 and iNOS expression in perihematomal tissue of rats. Overexpressed-KLK8 increased COX-2, iNOS, and Arg-1 expression and the content of IL-6, IL-1β, and TNF-α in perihematomal tissue of rats, confirmed by WB and ELISA. IF staining confirmed the expression of CCR5 was co-expressed with Iba-1, and the WB results shown increased CCR5 expression and decreased p-PKA and p-CREB expression in perihematomal tissue. Maraviroc (MVC, CCR5 inhibitor) administration rescued KLK8-induced behavioral deficits and brain injury (decreased water content and FJB-positive neuron numbers) in rats. Additionally, MVC suppressed p-PKA and p-CREB expression and the content of IL-6, IL-1β, and TNF-α in perihematomal tissue, induced by overexpressed-KLK8. Co-IP confirmed the binding of CCR5 and CCL14 in HMC3 cells. Transwell assay shown that KLK8 plus CCL4 promoted the chemotactic activity of cells, which was rescued by MVC. The biological function of KLK8/CCL14/CCR5 axis in ICH injury was also proved by MVC administration in HMC3 cells. Overall, our work revealed that KLK8 overexpression aggravated ICH process and involved in microglial activation. KLK8 might activate CCL14 thereby turning on downstream CCR5/PKA/CREB pathway, providing a theoretical basis for future therapy.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Haijian Liu,Miao Wang,Guofu Huang
A new composite material (SDs@ZIF-8) was synthesized by integrating sulfur nanodots (SDs) into metal-organic frameworks (ZIF-8) through a facile one-step self-assembly strategy. The obtained SDs@ZIF-8 has not only the high adsorption performance of ZIF-8 but also the superior fluorescence characteristics of SDs . The composite featured good dispersibility, stable structure as well as excellent fluorescence in water solution, and can be used as an ideal fluorescent sensor for tartrazine detection. Due to the high specific surface area and adsorption performance of ZIF-8, the prepared composite material can significantly enrich tartrazine, further enhancing the sensitivity of analysis. The fluorescence of SDs @ZIF-8 composite can be effectively quenched by tartrazine through the inner filter effect. The sensing technique exhibited exceptional sensitivity, as evidenced by its impressive detection limit of 6.5 nM across a broad linear range spanning from 0.02 to 90 μM. In addition to its high sensitivity, the technique displayed rapid response times and excellent selectivity. Moreover, the fluorescent sensing technology we developed has been employed successfully for the detection of tartrazine in real samples, which is expected to promote the development of the food safety industry.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 11
·1-7
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IF 5.833
Wang Tingting,Yang Li,Cheng Yuhuan,Zhang Yulian,Ye Jiannong,Chu Qingcui,Cheng Guifang
A novel kind of chiral open-tubular (OT) column was established with homochiral zeolitic imidazolate framework-8 nanomaterials using L-histidine as the chiral carbon center (L-His-ZIF-8). The morphologies of L-His-ZIF-8 nanoparticles and chiral OT column were characterized by scanning electron microscopy. The effects of L-His-ZIF-8 concentrations, pH values, and concentrations of the running buffer on the resolution of the selected chiral compounds were investigated based on miniaturized capillary electrochromatography with amperometric detection system (mini-CEC-AD), respectively. The separation performances of the prepared L-His-ZIF-8@OT chiral columns were explored under the optimal conditions, and the RSDs of run-to-run, day-to-day, and column-to-column reproducibility were less than 6.7% using salbutamol raceme as the model enantiomers. The prepared chiral OT columns have been successfully applied to the enantioseparation of one pair of amino acid enantiomers, two pairs of racemic drugs, and three pairs of neurotransmitter enantiomers. Under the optimum conditions, the prepared OT columns were applied to real-world sample analysis of salbutamol aerosol. The limits of detection of salbutamol raceme were 0.90 μg·mL −1 (S/N = 3), and the recovery was 80.4–82.7%. The assay results indicated that this kind of chiral OT column modified with homochiral L-His-ZIF-8 possesses good reproducibility and stability. This developed mini-OT-CEC-AD system has some attractive characteristics of sensitivity and low cost, providing a potential way for the separation of chiral compounds. Graphic Abstract
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危险品化学品经营许可证（带存储）