CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chengjuan Wang,Haotian Jiang,Bowen Cui,Xiaodan Xu,Yanxiang Wang,Chengguo Wang
Rational design of multifunctional and high-performance electromagnetic wave (EMW) absorbers is highly desirable but still remains a challenge. Herein, the 3D heterostructural Co@carbon nanotubes/carbon fiber (Co@CNTs/CF) hybrids derived from ZIF-67/CF were successfully fabricated via the in-situ synthesis of ZIF-67 on CF and subsequent catalytic chemical vapour deposition. Intriguingly, the as-obtained composites acquire adjustable EMW absorption and favorable mechanical properties simultaneously. Specifically, taking advantage of adequate conductive paths, plentiful heterogeneous interfaces, suitable defect vacancies, appropriate magnetic loss, as well as optimized impedance matching, Co@CNTs/CF delivers a brilliant EMW absorption intensity of −45.11 dB at only 1.15 mm together with a broad effective absorption bandwidth (EAB) of 4.0 GHz (1.23 mm), and an unexpected minimal reflection loss up to −65.63 dB (3.84 GHz) coupled with an EAB of 3.6 GHz at merely 1.09 mm, respectively. In addition, the tunable EAB can be achieved in 2.6–18 GHz, covering 96 % of the test frequency by changing the absorber thickness from 0.93 to 5.0 mm (29 wt%). Moreover, the maximum radar cross section reduction can reach 48.8 dBm 2 . The uniform layer of CNTs with moderate crystallinity also enables Co@CNTs/CF to improve the tensile strength and Weibull modulus compared to unsized CF. This study paves a novel avenue for developing multifunctional materials based on CF through an efficient, controllable and low-cost approach.
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高影响因子
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
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2023
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IF 3.4
Xueqiang Sun,Fuxin Li,Lingyan Yuan,Zhitong Bing,Xun Li,Kehu Yang
Resveratrol (Res) is known for its potential in treating various types of cancers, with a particular advantage of causing minimal toxic side effects. However, its clinical application is constrained by challenges such as poor bioavailability, low water solubility, and chemical instability in neutral and alkaline environments. In light of these limitations, we have developed a pH-responsive drug delivery nanoplatform, Res@ZIF-8/TA NPs, which exhibits good biocompatibility and shows promise for in vitro cancer therapy. Benefiting from the mild reaction conditions provided by zeolitic imidazolate frameworks (ZIFs), a “one-pot method” was used for drug synthesis and loading, resulting in a satisfactory loading capacity. Notably, Res@ZIF-8/TA NPs respond to acidic environments, leading to an improved drug release profile with a controlled release effect. Our cell-based experiments indicated that tannic acid (TA) modification enhances the biocompatibility of ZIFs. 3-(4,5)-dimethylthiahiazo (-z-y1)-3,5-di- phenytetrazoliumromide (MTT assay), Hoechst 33342/PI staining, cell scratch assay, Transwell and Reverse Transcription quantitative PCR (RT-qPCR) assays further demonstrated that Res@ZIF-8/TA NPs inhibited colon cancer cell migration and invasion, and promoted apoptosis of colon cancer cells, suggesting a therapeutic potential and demonstrating anti-cancer properties. In conclusion, the Res@ZIF-8/TA NPs pH-responsive drug delivery systems we developed may offer a promising avenue for cancer therapy. By addressing some of the challenges associated with Res-based treatments, this system could contribute to advancements in cancer therapeutics.
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PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 2
·719-735
·
IF 3.9
Mojtaba Rostami,Milad Jourshabani,Fatemeh Davar,Ghodsi Mohammadi Ziarani,Alireza Badiei
In this research, the ultrasound (US) technique was applied as a facile synthesis method for preparing the black TiO 2 -g-C 3 N 4 type II heterojunction, coupled with a Schottky junction MOF (ZIF-67)-derived x wt% Co 3 S 4 /nitrogen-doped carbon (NC) ( x = 3, 10, and 15) with hollow nanobox (HNB) morphology, as a smart nanoheteroarchitecture (NHA) photocatalyst to enhance visible-light photocatalytic activity. Additionally, the solvothermal synthesis route was employed to fabricate the MOF (ZIF-67)-derived Co 3 S 4 /NC cubic hollow nanoboxes (CHNBs) before the pyrolysis process. The black TiO 2 -g-C 3 N 4 wt% Co 3 S 4 /NC (TiCN-15% CoS/NC) NHAs exhibited high photocatalytic activity in degrading methylene blue. The synergetic effect of all components in black TiCN- x wt% CoS/NC NHAs resulted in efficient electron-hole pair separation and charge mobility on Co 3 S 4 /NC HNB and g-C 3 N 4 surfaces, which led to a highly effective recombination rate of charge carriers and an excellent improvement in photocatalytic performance.
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高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Nahar Jannatun,Yuqian Zhang,Ben Wu,Qingle Song,Guoli Cao,Wenhe Luo,Feng Yuan,Qi Li,Yanqiao Zeng,Guofang Zhang,Guocheng Wang,Yang Li
Epigallocatechin-3-gallate (EGCG), the most abundant tea polyphenol, possesses excellent anti-inflammation properties. Emerging studies proved its potent potential as an immune checkpoint (ICP) inhibitor for anticancer therapy. However, the low bioavailability of EGCG reduces its treatment efficiency. In this work EGCG-based nanomedicine EGCG–ZIF-8@PDA–PEG (EZP) was developed via the coordination between ZIF-8 MOF and EGCG, followed by polydopamine and PEG functionalization for efficient tumor-targeting EGCG delivery. Results demonstrated that the EGCG loading rate in EZP reached up to 85%. Both in vitro and in vivo studies proved that the EZP nanoparticles were capable of inhibiting the expression of ICP molecules and modulating the inflammatory tumor microenvironment, evidenced by the suppression of PD-L1 expression, the reduction of inflammatory cytokines, and the resultant decline in the number of immunosuppressive cells, for instance, myeloid-derived suppressor cells, tumor-associated macrophages, and regulatory T cells. These synergistic effects significantly improved the infiltration of dendritic cells and T cells in tumors, realizing an inspiring antitumor effect.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Na Yang,Hao Jiang,Longfei Zhang,Xiang Wang,Luhong Zhang,Yongli Sun,Bin Jiang
Spinel oxides can be considered effective heterogeneous catalysts in activating peroxymonosulfate (PMS) for wastewater decontamination . However, the intrinsic characteristics of agglomeration and metal ion leaching impede its further application. In this work, to further improve the catalytic efficiency and stability of the catalyst, ZIF-8 was employed as the candidate and further etched by tannic acid (TA) to obtain a core-shell structure with less mass transfer resistance. Following this, CoFe 2 O 4 was anchored on TA-ZIF-8 matrix via a hydrothermal method. Benefiting from the tailored core-shell structure and high activity of CoFe 2 O 4 , the as-prepared CoFe 2 O 4 @TA-ZIF-8 catalyst shortened the mass transfer distance of radical to target pollutant, thus realizing high radical utilization efficiency. Accordingly, 98.1% of tetracycline (TC) can be eliminated in 30 min with kinetic constants 3.15 times higher than pristine CoFe 2 O 4 . Besides, the TC degradation efficiency can still maintain 84.1% after five consecutive cycles with cobalt leaching lower than 0.306 mg/L, showing favorable stability compared with pristine CoFe 2 O 4 . Furthermore, electron paramagnetic resonance (EPR) and quenching experiments exhibited that singlet oxygen and sulfate radicals play dominant roles in TC degradation processes. This work fabricates an efficient CoFe 2 O 4 @TA-ZIF-8 heterogeneous catalyst for degrading refractory TC, which may possess potential applications in wastewater treatment .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hao Zhou,Yongheng Shi,Lingmei Dai,Dehua Liu,Wei Du
Pyrolyzing ZIF-8 into N-doped carbon is now inspiring new potential of ZIF-8 for extensive applications. However, the exploration of such ZIF-8-derived carbon for biotechnological applications has been rarely investigated, especially in this context that imidazole derivatives are of rich functionality in life science. Herein, we reported a facile temperature-dependent pyrolysis method to achieve the effective N-doping in ZIF-8-derived macroporous carbon, which was systematically investigated for the immobilization of lipase from Thermomyces lanuginosus (TLL) in biodiesel production. MNC-600 (macroporous N-doped carbon derived at 600 °C) exhibited the best immobilization performance, with the highest specific activity of 190.6 U mg −1 , a 36.9% increase than free TLL. Moreover, MNC-600@TLL showed superior effectiveness and robustness in biodiesel production. A much faster rate of conversion and the highest biodiesel yield of 87.4% were observed. After eight successive batches of recycling, MNC-600@TLL retained 93.4% of its initial activity. XPS analysis revealed the evolution of N species during the pyrolysis of ZIF-8. It was proposed that the abundant doping of pyrrolic N species played a major role in the surprising performance of MNC-600, mainly through hydrogen bonding interactions, which simultaneously realized the activation of reactants as well as the in-situ hydrophobization of biocatalyst. This report is anticipated to pave a way for the exploration of ZIF-8-derived N-doped carbon for extensive biotechnological applications.
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高影响因子
ChemNanoMat
·
2023
·Vol. 9
·期 10
·e202300310
·
IF 3.8
Xin Cui,Jiachen Zhang,Yitong Liu,Wen Shao,Yawen Tang,Hanjun Sun
Graphical A Ru-ZIF-8 nanozyme with both esterase like and peroxidase like activities were prepared for acetylcholine (ACh) detection. On the basis of the Ru-ZIF-8 nanozyme, a portable nanozyme strip was developed as a novel biosensor for detecting ACh, which was conducive to promoting the development of multiple enzyme cascade assays. In the present study, the incorporation of Ru into the framework of ZIF-8 resulted in that a Ru-ZIF-8 nanozyme with both esterase-like activity and peroxidase-like activity. Owing to the dual nanozymatic activities of Ru-ZIF-8 nanozyme, the acetylcholine (ACh) detection process utilized only one natural enzyme (choline oxidase), which greatly simplified the detection procedure. In the detection process, nanozyme Ru-ZIF-8 showed esterase-like activity to catalyze the hydrolysis of ACh to choline. Then the generated choline was oxidized by choline oxidase to generate H 2 O 2 . Finally, Ru-ZIF-8 with peroxidase-like activity was used to catalyze H 2 O 2 to oxidize 2,2′-azino-bis (3-ethylbenzothiazo-line-6-sulfonic acid) ammonium salt with a color change. As a result, the linear range for ACh was from 0.01 μM-22 μM with the detection limit (DL) of 5.5 nM. In addition, Ru-ZIF-8 was utilized to fabricate a portable detection test strip. Our work provided a simple, portable, low-cost, highly sensitive and selective assay for the detection of ACh, which paved the way for the development of multi enzyme cascade assays.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 35
·12057-12067
·
IF 6.4
Zhenping Ma,Lei Zhang,Xianzhen Wang,Guang Xiao,Yongbao Feng,Wei Wang,Konghu Tian,Dewei Liang,Yagang Yao,Qiulong Li
With the rapid advancements of portable and wearable devices, high-efficiency electromagnetic interference (EMI) shielding materials are highly required to eliminate radiated electromagnetic pollution. Ti3C2Tx MXene has shown great application potential as an EMI SE material due to its good conductivity. However, a single-loss mechanism has many limitations. Herein, to enrich the electromagnetic-wave-loss ways, MXene@ZIF-67/multiwalled carbon nanotubes (MWCNTs) composite films were successfully prepared by vacuum-assisted filtration, combined with the introduction of magnetic ZIF-67 anchored on MXene by an electrostatic self-assembly method. The MXene@ZIF-67/MWCNTs composite film (MZ2M8) achieved the best EMI shielding performance of 63.6 dB at 32 μm thickness, and the contribution ratio of the scattering parameters for absorption to reflection, i.e., SEA to SET, was 66.94%, thus achieving high absorption loss. Due to the high aspect ratio of the MWCNTs and the densely stacked “brick–mortar” layered structure, the composite film also exhibited excellent flexibility and mechanical performance, in which MZ8M2 could deliver a high tensile strength of 115.2 MPa, ensuring practical applications in different environments. Moreover, the thermal conductivity of MZ2M8 reached 3.367 W m−1 K−1, realizing the synergistic effect of high shielding efficiency and heat-dissipation performance, and avoiding the phenomenon of heat accumulation caused by the conversion of electromagnetic waves into heat energy.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Zhi Wang,Zhaokun Wang,Jiashuai Wang,Haofeng Shi,Chengdeng Wang,Yila Fan,Zhiming Bai,Chuang Zhu,Xiaoqin Yan
Water electrolysis has been acknowledged as a renewable, scalable, and effective way of producing hydrogen . However, for water splitting, efficient and noble metal-free electrocatalysts were lacking. Here, a Co–Ni–Zn porous three-dimension N-doped carbonization structure on the carbon nanotube film (CNTF) was synthesized through a metal organic frameworks (MOFs) annealing procedure. The porous morphology, caused by the evaporation of zinc at high temperatures, enhances the interaction between the catalysts and electrolyte, and the self-supporting structure minimizes the contact resistance between the catalysts and the substrate, which reduces obstructions during current flow. More active sites, multiple mesopores, and high conductivity are all features of this composite structure. It can achieve a small overpotential of 112 mV and 270 mV at a current density of 10 mA cm −2 , respectively, for hydrogen and oxygen evolution reactions (HER and OER). At a current density of 10 mA cm −2 , the Co–Ni–Zn/NCNTF has an external voltage of 1.58 V and is very durable for overall water splitting.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 18
·9547-9560
·
IF 4.4
Yang Xuhui,Jiang Siyu,Zhang Zhiyong,Li Bin,Xu Miaojun
Herein, zeolite imidazolate frameworks-67 defined as ZIF-67 was prepared and confirmed. The obtained ZIF-67 was served as a synergist in intumescent flame-retarded polypropylene (PP) composites to improve the flame retardant efficiency and smoke suppression performance. The results of thermogravimetric analysis indicated that the residual char of IFR/ZIF-67 with the mass ratio of 95:5 greatly enhanced from 24.9 mass% for IFR to 63.5 mass%, and increased by 155.0%. It was ascribed the complexation effect of cobalt ion in ZIF-67 for IFR system. With the incorporation of 18 mass% IFR/ZIF-67, the PP/IFR/ZIF-67 samples (PP-4) achieved UL-94V-0 rating during vertical burning tests and the limiting oxygen index (LOI) value was as high as 31.1%. Compared with PP/IFR (PP-1) containing 18 mass% IFR, the peak heat release rate (peak-HRR), total heat release (THR), peak smoke production rate (peak-SPR) and total smoke production (TSP) of PP-4 were decreased by 33.1%, 33.8%, 31.0% and 21.1%, respectively. The char residue of PP-4 was as high as 27.4 mass% at the end of cone calorimeter test (CCT). The more expanded, sufficient and dense char layer were generated during combustion, and the flame retardancy and smoke suppression of PP-4 were significantly improved. Meanwhile, the pyrolysis gaseous products were inhibited to enter into combustion zone due to the isolation effect of the generated intumescent char layer. Consequently, the PP/IFR/ZIF-67 composites with excellent flame retardant performance and smoke suppression were obtained.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Heng Wang,Xianjin Qi,Guizhi Yan,Jiahao Shi
Arsenic pollution is an international problem that must be urgently controlled. Therefore, this study is based on a one-pot precipitation method, in which copper ions were added to a zinc organic metal framework (ZIF-8) to partially replace the zinc ions and the obtained adsorbent (Cu-ZIF-8) used to effectively remove As(V) ions from water. The successful synthesis of the Cu-ZIF-8 adsorbent and its adsorption mechanisms were confirmed using scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS). In addition, the effects of pH (3–11), initial arsenic concentration (10–350 mg/L), and reaction time on the adsorption performance were also characterized. Our findings demonstrate that Cu-ZIF-8 had a high As(V) adsorption capacity of 238.11 mg/g, which was significantly higher than that of most adsorbents previously reported in the literature. Moreover, this material maintained >75% of its initial adsorption capacity after four adsorption-desorption cycles. The adsorption kinetics of Cu-ZIF-8 were accurately described using the pseudo-second-order kinetic model, whereas the adsorption isotherm was fitted using the Langmuir model. Collectively, our findings have demonstrated that doping organic metal frameworks with metal ions can substantially improve their adsorption performance without changing their structural properties. Therefore, Cu-ZIF-8 is a promising adsorption material for the treatment of As(V)-contaminated water.
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高影响因子
Materials Today Physics
·
2023
·
IF 11.5
Yanqin Wang,Yunlong Yang,Miao Miao,Xin Feng
Highly efficient electromagnetic wave (EMW) absorption materials with excellent thermal management are urgently required to solve the problem of electromagnetic pollution . Herein, bead-curtain-like carbon nanotube arrays@cobalt (CNT As@Co) hybrids are designed to enhance the EMW absorption performance by using CNT As templates. After the in-situ growth of ZIF-67, CNT As@Co hybrids are successively fabricated by thermal pyrolysis of CNT As@ZIF-67 at high annealing temperature. Owing to the unique three-dimensional (3D) bead-curtain-like microstructures, the CNT As@Co hybrid pyrolyzed at 500 °C (CNT As@Co-500) with an ultra-low filler loading of 2 wt% exhibits optimal EMW absorption properties . The minimum reflection loss (RL min ) is −36.86 dB at a thickness of 5.5 mm, and the effective absorption bandwidth (RL < −10 dB) reaches as broad as 5.78 GHz with a thickness of 2.5 mm. In addition, CNT As@Co hybrids possess superior thermal conductivity (9.25 W m −1 K −1 ) among most similar CNT-based composites, which is conducive to the rapid dissipation of thermal energy converted from electromagnetic energy . This work provides a new paradigm for designing high-performance 3D EMW absorbers with multifunctionality in electronic devices.
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高影响因子
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