Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 17
·4442-4451
·
IF 7.779
Pengcheng Zhang,Hao Li,Xiaoqing Chen,Shucheng Liu,Quanzhang Wen,Canbing Li,Hanning Xiao
In this work, we prepare novel Ba7Zr2Nb4O21 and Ba8Zr3Nb4O24 ceramics with a smaller tolerance factor (for the AnBn−1O3n type hexagonal perovskite in BaO–ZrO2–Nb2O5 system) using a solid-phase reaction method, which shows good microwave dielectric properties of εr ∼ 33.5, Q × f ∼ 56 500 GHz and τf ∼ −17 ppm °C−1 (Ba7Zr2Nb4O21) and εr ∼ 32, Q × f ∼ 63 000 GHz and τf ∼ −27 ppm °C−1 (Ba8Zr3Nb4O24). Rietveld refinement of XRD and TEM shows that Ba7Zr2Nb4O21 and Ba8Zr3Nb4O24 with the BaO3 layer stacking sequence of (cccccchh) and (ccch)2 are eight-layer shifted and twinned hexagonal perovskite, respectively. As the sintering temperature increases, the εr and Q × f values of Ba7Zr2Nb4O21 and Ba8Zr3Nb4O24 exhibit a strong correlation with relative density. The relationship between the structure and properties is discussed in BaO–Zr/Sn/TiO2–Nb2O5 systems. The porosity excluded εr is mainly influenced by ion polarization, while the cell volume is also an essential factor affecting the permittivity. The variation of Q × f is related to the packing fraction in BaO–Zr/SnO2–Nb2O5 systems. The variation of τf is mainly regulated by the tolerance factor. This study shows that there is an opportunity to improve the microwave dielectric properties by adjusting the size of the B-site cation.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Haifeng Lu,Lichao Xu,Hua Wang,Shengyu Feng
Fluorescent silicone polymers have attracted much attention owing to their strong fluorescence and high stabilities. However, most of these silicone polymers have suffered from fluorescence quenching caused by aggregation in high concentrations. In this work, 7, 11-diphenyl-8 H - acenaphth[1, 2 - f ] isoindole-8, 10 (9 H ) - dione functionalized polysiloxane (PMDF) with strong blue fluorescence was successfully synthesized via Diels-Alder reaction. Besides high thermal stability, PMDF showed unique aggregation-induced emission enhancement in high concentrations, indicating it is an excellent fluorescent silicone polymer in both disperse and aggregate state. Moreover, the product polymer showed highly sensitive fluorescence response to Fe 3+ , with low detection limit to 0.895 ppm and a high selectivity in the present of other metal ions. This work may open a new window for exploring fluorescent polymers as ideal probe for Fe 3+ .
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 9
·6866-6874
·
IF 2.22
Zhao Yongke,Zhou Zheng,Chen Guangxin,Li Qifang
The metal–organic frameworks have gained high reputation due to their porous structures, high stabilities, ultralow densities, devisable organic ligands, and large specific surface area in recent years. In this work, ZIF-8@silane-modified sepiolite hybrids with a core–shell structure were synthesized successfully via an in situ grown method. The hybrids were then introduced into epoxy to prepare composites. Results showed that the epoxy composites exhibited improved dielectric and thermal properties when the amount of the fillers was only 0.6 wt%. The dielectric constant was decreased by 0.66, the thermal degradation temperature was increased by 46.2 °C, and the glass transition temperature was increased by 8.5 °C.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Zhen Zhao,Lei Zhang,Hongming Zhang,Wuhong Xin,Xiaowen Wang,Chunmiao Liu,Yang Guo,Yinghua Zhuang,Wanli Jiao
Investigating high-performance and low-energy consumption H 2 S sensors has become a hot research topic. This study adopted a one-step co-precipitation method to synthesize La-doped ZIF-8 deprotonating zinc acetate, lanthanum nitrate, and 2-Methylimidazole in an aqueous. La 2 O 3 /ZnO were synthesized with different La 3+ doping concentrations (0, 0.5, 1, and 1.5 at%). We found that La 3+ doping at a concentration of 1 at% showed the highest response value of 140 for 5 ppm H 2 S, at a low operating temperature of 100 °C, which is 2.4 times higher than that of pure ZnO. Additionally, La 3+ doping led to a lower detection limit of 1.9 ppb. The enhanced performance can be attributed to the widening of the difference in electron concentration, the increase in vacant oxygen content, and the spillover effect of H 2 S sensing. These factors were analyzed in detail by means of porosity, P-N heterojunctions, and the increased in adsorbed oxygen content caused by La 3+ doping.
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Pharmaceutics
·
2023
·Vol. 15
·期 7
·1874
·
IF 5.4
Heming Zhao,Liming Gong,Hao Wu,Chao Liu,Yanhong Liu,Congcong Xiao,Chenfei Liu,Liqing Chen,Mingji Jin,Zhonggao Gao,Youyan Guan,Wei Huang
Prostate cancer (PC) is one of the common malignant tumors of the male genitourinary system. Here, we constructed PTX@ZIF-8, which is a metal-organic-framework-encapsulated drug delivery nanoparticle with paclitaxel (PTX) as a model drug, and further modified the synthesized peptide dimer (Di-PEG2000-COOH) onto the surface of PTX@ZIF-8 to prepare a nanotargeted drug delivery system (Di-PEG@PTX@ZIF-8) for the treatment of prostate cancer. This study investigated the morphology, particle size distribution, zeta potential, drug loading, encapsulation rate, stability, in vitro release behavior, and cytotoxicity of this targeted drug delivery system, and explored the uptake of Di-PEG@PTX@ZIF-8 by human prostate cancer Lncap cells at the in vitro cellular level, as well as the proliferation inhibition and promotion of apoptosis of Lncap cells by the composite nanoparticles. The results suggest that Di-PEG@PTX@ZIF-8, as a zeolitic imidazolate frameworks-8-loaded paclitaxel nanoparticle, has promising potential for the treatment of prostate cancer, which may provide a novel strategy for the delivery system targeting prostate cancer.Keywords:metal-organic framework;paclitaxel;peptide dimer;prostate cancer
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PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Hai-Tao Wang,Ya-Pan Liu,Hao Zhang,Na Chang,Wei Shao,Meng-Shan Shi,De Ao,Mei-Chan Lu
With the regular structures composed of metal clusters and organic ligands, metal-organic frameworks (MOFs) are expected to be the competent stabilizing matrix for nanoparticles and the excellent precursor of metal oxide with carbon species by means of high temperature pyrolysis , resulting to porous architectures with unexpected adsorptive or catalytic properties. Herein, we design and propose a facile route for preparing porous Carbon doped ZnO/TiO 2 @ZIF-8 (C–ZnO/TiO 2 @ZIF-8) multi-component nano-platform using TiO 2 coated ZIF-8 as precursor and template followed by thermal calcination . The resulted C–ZnO/TiO 2 @ZIF-8 nanocrystal simultaneously possesses original ZIF-8 morphology and porous structure with connected ZnO nanoparticles. As a result, C–ZnO/TiO 2 @ZIF-8 shows obviously better adsorption affinity towards methylene blue (MB). Moreover, benefit from the TiO 2 coating outside ZIF-8 matrix, escape of carbon species which originate from pyrolysis of organic ligands is efficiently inhibited, with the resulted materials doped with abundant carbon. Therefore, charge transfer and isolation of the resulted catalyst are promoted accordingly, with catalytic activity of the prepared C–ZnO/TiO 2 @ZIF-8 multi-component photocatalyst significantly increased by 1.8-fold and 3.0-fold compared to ZnO@ZIF-8 photocatalyst under irradiation of UV and visible light, respectively.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 22
·期 2
·581-590
·
IF 2.316
Liu Yi,Ma Xiaoyan,Sun Kun,Yang Kaiqi,Chen Fang
As a kind of organic–inorganic hybrid materials with nanocage structure, polyhedral oligomeric silsesquioxane (POSS) has the advantages of good interaction with polymer and excellent thermal and mechanical stability. Star-shaped polyhedral POSS-poly(methyl methacrylate) (POSS-(PMMA
n
) 8 ) with different molecular weights had been synthesized by sequential atom transfer radical polymerization (ATRP) with POSS-(C 3 H 6 Cl) 8 as the initiator. Electrospun polyvinylidene fluoride (PVDF) composite gel polymer electrolytes (GPEs) modified by POSS-(PMMA
n
) 8 were prepared, and their electrochemical and mechanical properties were assessed. The POSS-(PMMA
n
) 8 particles were found to improve thermal stability and mechanical strength of the GPEs without decreasing electrochemical properties. Among all composite GPEs studied, the best comprehensive performance was obtained from PVDF-[POSS-(PMMA 46 ) 8 ] GPE: the porosity was 60.0%, and the tensile strength and the elongation at break were 4.94 MPa and 52.2%, respectively. Besides, the ionic conductivity was 4.85 × 10 −3 S cm −1 at room temperature, the electrochemical window could reach 6.0 V, and the interfacial impedance with Li electrode was 256.15 Ω. The cells with POSS-(PMMA) 8 -modified composite electrolytes also have good cycle performance. These results suggest that the PVDF-[POSS-(PMMA) 8 ] composite GPEs are suitable for lithium-ion battery applications.
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DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 39
·15595-15602
·
IF 4.177
Xinlin Li,Shiling Zhao,Wei Zhang,Yansheng Liu,Rong Li
Ruthenium (Ru) nanoparticles (NPs) are supported on nitrogen-doped porous carbon (NPC) derived from metal–organic-framework (MOF) ZIF-8 for the first time. NPC is prepared by the direct carbonization of ZIF-8 crystals, which not only retains the original morphology of ZIF-8 but also provides a high surface area and stable chemical–physical properties. Ru NPs were supported by different methods. Four types of Ru-based catalysts are tested in the selective hydrogenation of p-chloronitrobenzene (p-CNB) and p-bromonitrobenzene (p-BNB) to haloanilines. Different catalytic activities and selectivities are obtained through these catalysts. After the screening of the catalysts and reaction conditions, high conversion and selectivity were obtained. The hydrogen pressure is limited to 1.5 MPa, which is much lower than most previous reports, and the dehalogenation reaction is restricted to a very low level. Furthermore, the dehalogenation properties of the Ru/NPC catalysts are also studied.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 94
·77159-77167
·
IF 3.84
Lili Xiao,Shenghai Zhou,Guangzhi Hu,Hongbo Xu,Yi Wang,Qunhui Yuan
A novel nanoporous carbon material (NPC) was prepared by simple pyrolysis of an isoreticular metal–organic framework-8 (IRMOF-8) at 1000 °C. The obtained NPC possessed a three-dimensional hierarchy of micro-, meso-, and macropores, a high surface area of 1715 m2 g−1 and a large pore volume of 1.70 cm3 g−1. By using Nafion and bismuth films as co-modifiers, the obtained NPC was further used for the fabrication of a sensitive NPC–Nafion/bismuth composite modified glassy carbon electrode (NPC–Nafion/Bi/GCE) for electrochemical determination of Pb(II) in aqueous solution. The synergistic effect of the Nafion and Bi films, as well as the high activated surface area, hierarchical porous texture, and good electrical conductivity of the NPC contributed to the enhanced electrochemical response of Pb(II) at the NPC–Nafion/Bi/GCE during differential pulse anodic stripping voltammetry. Under the optimum conditions, the fabricated electrode exhibited two linear ranges varying from 1–7 μg L−1 and 7–70 μg L−1, respectively. The detection limit was estimated to be 0.8 μg L−1 (at a signal-to-noise ratio of 3) for Pb(II), which was about 12 times lower than the guideline value set by the World Health Organization (WHO) for drinking water. The NPC–Nafion/Bi/GCE showed high reproducibility, with relative standard deviations of 6.2% and 3.4% for multiple successive measurements of 10 and 50 μg L−1 Pb(II), respectively. The composite electrode was successfully used in the analyses of Pb(II) in tap-water samples, and good recoveries were obtained for various spiked values.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Siyuan Jin,Zhou Jie,Ruizhi Wu,Xiaochun Ma,Zhe Yu,Wang Guixiang,Jinghuai Zhang,Boris Krit,Sergey Betsofen,Neshchimenko Vitalii,Buzikov Ruslan,Min Qiu,Yurong Yang,Jiaming Chen
An in-situ grown LDH/ZIF-8 hybrid film on the surface of MAO film based on the LA93 alloy was successfully fabricated by the one-step method. The composite film, called as MLZ, demonstrates exceptional corrosion resistance. The corrosion current density is reduced by two orders of magnitude compared to the MAO film. Furthermore, it possesses significant long-term protective capabilities. Experimental measurement and density functional theory (DFT) calculations were conducted to investigate the formation mechanism of MLZ composite film. During the hydrothermal, Zn ions from the in-situ generated LDH on the MAO surface serves as active nucleation sites, facilitating the nucleation and growth of ZIF-8 crystals. The formation of ZIF-8 effectively compensates for the intergranular defects in LDH, enhancing the integrity of the film. LDH/ZIF-8 film effectively seals defects in the MAO film and constructs a robust physical barrier, significantly enhancing the protective capacity of the film.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wei Wang,Cong Shen,Ruiqi Shao,Yanlong Zhu,Wenze Yu,Xianyan Wu,Wensheng Huang,Kai Li,Zhiwei Xu
Conventional photocatalysts utilized in the photodegradation of organic dyes are prone to cause agglomeration of nanocatalysts, which affects the photocatalytic efficiency and is difficult to recycle. In this paper, photocatalysts were rapidly loaded onto polypropylene (PP) meltblown nonwoven material fibers possessing a large specific surface area using water as a solvent and a one-step in situ growth method under ultrasonic conditions. That is, by ultrasonically and rapidly growing zeolite imidazolium skeleton material (ZIF-8) in situ on the surface of dopamine-modified PP meltblown fibers and directly doping carbon dots (CDs) modified TiO 2 during the in situ growth of ZIF-8, a CDs-TiO 2 /ZIF-8/PP composite photocatalytic material was formed. The microstructure, chemical structure, and photocatalytic performance of CDs-TiO 2 /ZIF-8/PP composite photocatalytic material were characterized. The findings indicated that the CDs-TiO 2 /ZIF-8 heterojunction nanocatalysts were effectively loaded onto the exterior of PP meltblown fibers. The CDs-TiO 2 /ZIF-8/PP composite photocatalytic materials exhibited highly efficient and synergistic photocatalytic degradation of the anionic dye Congo red (CR). Upon exposure to visible light, the degradation of CR could reach 99.1 % within 100 min and 99.6 % within 120 min. The first-order kinetic constant for photocatalytic degradation was measured to be 0.0419 min⁻ 1 . Furthermore, the photodegradation of CR by the CDs-TiO 2 /ZIF-8/PP composite photocatalytic material maintained about 85 % after 5 cycles. Finally, the mechanism of in situ deposition and photocatalytic activity of the nanocomposites on the fiber surface was proposed. The composite photocatalytic material can be recycled, and the preparation process is green, simple, and efficient, which has potential application prospects for industrial wastewater treatment.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Chen Wang,Chenyang Zhao,Yue Li,Jie Liu,Di Cheng,Tao Shen,Ji Zhang,Qianhong Shen,Hui Yang
The spatial distribution of functional nanofillers in anticorrosion coatings significantly influences their ability to seal micropores/cracks and enhance self-healing properties. In this study, a novel dual-responsive nanocontainer loaded with the corrosion inhibitor benzotriazole (BTA) was developed for active corrosion protection in waterborne epoxy coatings. The magnetic nanocontainers (Fe 3 O 4 @BTA-ZIF-8) were synthesized via the in-situ growth of BTA-encapsulated zeolitic imidazolate frameworks-8 (ZIF-8) on the surface of anion-modified Fe 3 O 4 nanoparticles. This unique structure endows the nanocontainers with pH responsiveness for controlled BTA release under corrosive conditions. Additionally, under an external magnetic field, the nanocontainers migrate toward the coating/metal interface, increasing the local inhibitor concentration and improving corrosion resistance. Potentiodynamic polarization tests revealed that the nanocontainers achieved an inhibition efficiency of 82.40 % on carbon steel surface after 24 h of saline immersion. Cross-sectional analysis of the composite coatings confirmed the magnetic-field-induced accumulation of nanocontainers at the coating/substrate interface, facilitating rapid and efficient inhibitor release. Electrochemical impedance spectroscopy results further revealed a low frequency impedance value (|Z| 0.01 Hz ) of 1.42 × 10 10 Ω·cm 2 for epoxy coating containing magnetically distributed Fe 3 O 4 @BTA-ZIF-8 nanocontainers after 35 d of saline immersion, over an order of magnitude higher than that of coating without magnetic modulation. Furthermore, the scratched composite coating after magnetic modulation exhibited an improvement efficiency (η) of 165.04 % after 6 h of immersion, compared to only 22.76 % for the non-modulated counterpart. These results confirm the long-term protective performance of Fe 3 O 4 @BTA-ZIF-8 within epoxy coatings under magnetic modulation. This study is the first to introduce a magnetic MOF-based nanomaterial for corrosion protection, demonstrating the potential of epoxy coatings with magnetically directed distribution and pH-responsive inhibitor release.
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危险品化学品经营许可证（带存储）