Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Hu Changjiang,Jiang Zhiwen,Wu Qunyan,Cao Shuiyan,Li Qiuhao,Chen Chong,Yuan Liyong,Wang Yunlong,Yang Wenyun,Yang Jinbo,Peng Jing,Shi Weiqun,Zhai Maolin,Mostafavi Mehran,Ma Jun
The efficient use of renewable X/γ-rays or accelerated electrons for chemical transformation of CO 2 and water to fuels holds promise for a carbon-neutral economy; however, such processes are challenging to implement and require the assistance of catalysts capable of sensitizing secondary electron scattering and providing active metal sites to bind intermediates. Here we show atomic Cu-Ni dual-metal sites embedded in a metal-organic framework enable efficient and selective CH 3 OH production (~98%) over multiple irradiated cycles. The usage of practical electron-beam irradiation (200 keV; 40 kGy min −1 ) with a cost-effective hydroxyl radical scavenger promotes CH 3 OH production rate to 0.27 mmol g −1 min −1 . Moreover, time-resolved experiments with calculations reveal the direct generation of CO 2 •‒ radical anions via aqueous electrons attachment occurred on nanosecond timescale, and cascade hydrogenation steps. Our study highlights a radiolytic route to produce CH 3 OH with CO 2 feedstock and introduces a desirable atomic structure to improve performance.
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Journal of Food Measurement and Characterization
·
2023
·Vol. 17
·期 6
·5972-5979
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IF 3.4
Zhao Shujun,Liu Wei,Song Dapeng
The detection of the herbicide propachlor in environmental and food samples is critical due to its potential toxic effects. In this study, a sensitive and selective electrochemical sensor based on a molecularly imprinted polymer (MIP), polyethyleneimine-treated multi-walled carbon nanotubes (PEI-MWCNTs), and gold nanoparticles (AuNPs) was developed for propachlor detection. The PEI-MWCNTs enhanced the conductivity of the sensor, while AuNPs promoted electron transfer during the detection process, resulting in a lower detection limit (78 nM) and a wider linear range (0.5 µM to 70 µM) compared to traditional sensors. Furthermore, the sensor exhibited high selectivity against other herbicides, with interference suppression percentages above 92% for common contaminants. The performance of the sensor was further improved by integrating an XGBoost machine learning algorithm for data analysis, which improved the predictive accuracy of propachlor concentration. Reproducibility tests on three independently prepared sensors showed a relative standard deviation (RSD) below 5%. This innovative approach presents a significant advancement in the field of propachlor detection, providing an effective tool for environmental monitoring and food safety.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 4
·1-17
·
IF 20.1
Hou Chunping,Xie Haidong,Qu Yuqing,Tian Hui,Jiang Jingying,Lu Hui,Yang Shaolin,Ma Yong
Silicon oxide (SiO x ) is considered to be one of the most promising anodes of lithium-ion batteries for its advantageous capacity and abundant natural resources. However, the practical application of SiO x is facing great challenges due to its low conductivity and poor cycle performance. In order to accelerate the commercial application of SiO x , we constructed a pitch pyrolytic carbon rigid coating and a highly conductive polyvinyl alcohol/polyethyleneimine/carbon nanotubes (PVA/PEI/CNTs) flexible coating on the surface of micron-sized SiO x . The synergistic effect of the double coating enhances the conductivity of SiO x , reduces the strain stress caused by the volume change of SiO x , prevents the particles from breaking away from the current collector, and maintains the structural integrity of SiO x under long-term cycling. The obtained SiO x /E@CPPC anode exhibits high initial coulombic efficiency (73.91%), excellent cycle stability (645.8 mAh·g −1 after 700 cycles at 0.5 A·g −1 ) and excellent rate performance (407.1 mAh·g −1 at 5 A·g −1 ). The double coating makes SiO x /E@CPPC composites have a good application prospect in lithium-ion batteries.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 21
·1-10
·
IF 2.8
Yu Hongquan,Gao Xiao,Huang Chenchen,Liu Shimin,Chen Baojiu,Xu Sai,Zhang Yong,Zhao Hong
CsPbCl 3 and Mn:CsPbCl 3 nanocubes/nanorods were prepared by a hot injection technique. The crystal structure, size and morphology of the CsPbCl 3 and Mn:CsPbCl 3 samples were measured by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The edgelengths of the nanocubes and the length and width of the nanorods of CsPbCl 3 are between tens and hundreds of nanometers. The size and morphology of Mn:CsPbCl 3 are similar to those of CsPbCl 3 . The introduction of Mn 2+ ions led to little change in the CsPbCl 3 host structure. Their electrochemical properties for LIB application were tested by cyclic voltammetry, galvanostatic charge–discharge and electrochemical impedance spectroscopy. The introduction of a small amount of Mn 2+ ions can improve the structural stability of CsPbCl 3 during charge–discharge cycles because the Mn 2+ part replaces the Pb 2+ ions of CsPbCl 3 . Thus, Mn:CsPbCl 3 shows high discharge specific capacities, excellent cyclic performance, and lower electrochemical impedance values than CsPbCl 3 in LIB applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2023
·Vol. 34
·期 20
·1-15
·
IF 2.8
Xia Yifan,Lin Jingyu,Qian Jun,Liu Xiaoyun,Zuo Peiyuan,Zhuang Qixin
Improving the compatibility and dispersion between nanoparticles and polymers has become the key to enhance the dielectric properties. In addition, dielectric materials should also have excellent dielectric and thermal stability to meet the application under extreme conditions. Herein, we synthesized a core–shell structure BST@HBPI and BST@HBPI/PEI nanocomposite films. HBPI owns a chemical structure similar to polyetherimide (PEI), and the dipole moment of the polar group contained in it is small, so it can enhance the interface interaction between the nanoparticles and the matrix, hence effectively inhibiting the free charge, and reducing the leakage current in composite. The results show that the introduction of HBPI not only effectively improves the compatibility and dispersion of nanoparticles and polymer matrix, but also greatly enhances the dielectric properties and energy storage properties of nanocomposites. Under an electric field of 200 kV mm −1 , the minimum charge-discharge efficiency of BST@HBPI/PEI reaches 74.36%, which is 1.33 times of that for BST/PEI (55.97%), and the maximum discharge energy density reaches 5.01 J cm −3 , which is 1.28 times comparing to BST/PEI (3.89 J cm −3 ). Meanwhile, due to the preeminent electrothermal stability of nanoparticles and matrix, nanocomposites can maintain excellent dielectric properties at high temperatures. The dielectric constant of 10 vol% BST@HBPI/PEI (7.56 J cm −3 ) is 93.24% at 25 °C (8.113 J cm −3 ) while the dielectric loss at 200 °C (0.04287) is 114.29% when comparing to that at 25 °C (0.03751). This work provides a promising method for manufacturing dielectric materials that can work in extreme environments.
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JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
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2023
·
IF 3.1
Yu Hongrui,Huang Xueying,Zhou Liping,Wang Yi
Active packaging with antimicrobial functions to improve the quality and extend the shelf life of food products has gained great interest. Because commercial plastic packaging materials are not biodegradable and cause great environmental problems, plant-derived natural materials have been widely studied for the application of biodegradable packaging materials. Herein, we reported a study of essential oils (EOs)-loaded zein film. Cinnamaldehyde (CIN), carvacrol, and eugenol were added to equip the films with antimicrobial effects, while polyethylene glycol (PEG) and oleic acid (OA) were selected for the improvements of mechanical properties. The results showed that PEG efficiently improves the tensile strength and elongation (%E) of zein films compared to OA, although PEG induced weaker water barrier properties of the films than OA. FTIR spectra confirmed the formation of the hydrogen bonds between zein and PEG/OA. The EO-embedded zein film showed better antimicrobial effects than EO themselves. CIN-embedded films showed the highest antimicrobial effect among the three EOs. The sizes of the inhibition zones against Staphylococcus aureus of PEG-added zein films with 1%, 3%, and 5% CIN were 5.67, 12.67, and 16.67 mm, which were larger than that of pure CIN, with the sizes of 0.00, 3.00, and 4.67 mm, respectively. The developed films demonstrate a gradual release of EOs and show antimicrobial effects up to 96 h, indicating their high potential for the applications as active food packaging.
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Nano Research
·
2023
·
IF 9.9
Li Hanbo,Meng Dejing,Zhang Chenqi,Ji Yinglu,Gao Xinshuang,Hu Zhijian,Wu Xiaochun
Herein, a new strategy is proposed for achieving dynamic chiral controls in self-assembly systems of plasmonic nanorods based on temperature-modulation. Via enlarging Au{100} side facets of Au nanorod (AuNR) building block and changing surface ligand from often-used cetyltrimethylammonium bromide (CTAB) to cetylpyridinium chloride (CPC), inversion of chiroptical signal in side-by-side (SS) oligomers is realized. Under the guide of chiral cysteine (Cys), Au{100} side facet-linked SS rods twist in the opposite direction compared with Au{110} side facet-linked counterparts. At high CPC concentration, by controlling the incubation temperature of chiral Cys, the dominant twist mode can be regulated. Finite-difference time-domain (FDTD) simulations indicate the key role of the twisting dihedral angle of the oligomers in driving chiral signal inversion. At low CPC concentration, a temperature-sensitive chiral switching is observed owing to the conformation change of the CPC ligand layer. The temperature-modulated chiral responses are based on the interactions of chiral molecules, achiral surface ligands, and exposed facets of the building block. The rich dynamic tunability of chiroptical responses of plasmonic assemblies may find applications in stimulus-responsive nanodevices.
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JOURNAL OF NANOBIOTECHNOLOGY
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2023
·Vol. 21
·期 1
·1-21
·
IF 10.2
Li Duo,Ren Ting,Ge Yunxuan,Wang Xiaoli,Sun Guohui,Zhang Na,Zhao Lijiao,Zhong Rugang
Carmustine (BCNU), a vital type of chloroethylnitrosourea (CENU), inhibits tumor cells growth by inducing DNA damage at O 6 position of guanine and eventually forming dG-dC interstrand cross-links (ICLs). However, the clinical application of BCNU is hindered to some extent by the absence of tumor selectivity, poor stability and O 6 -alkylguanine-DNA alkyltransferase (AGT) mediated drug resistance. In recent years, tumor microenvironment has been widely utilized for advanced drug delivery. In the light of the features of tumor microenvironment, we constructed a multifunctional hypoxia/esterase-degradable nanomicelle with AGT inhibitory activity named HACB NPs for tumor-targeting BCNU delivery and tumor sensitization. HACB NPs was self-assembled from hyaluronic acid azobenzene AGT inhibitor conjugates, in which O 6 -BG analog acted as an AGT inhibitor, azobenzene acted as a hypoxia-responsive linker and carboxylate ester bond acted as both an esterase-sensitive switch and a connector with hyaluronic acid (HA). The obtained HACB NPs possessed good stability, favorable biosafety and hypoxia/esterase-responsive drug-releasing ability. BCNU-loaded HACB/BCNU NPs exhibited superior cytotoxicity and apoptosis-inducing ability toward the human uterine cervix carcinoma HeLa cells compared with traditional combined medication of BCNU plus O 6 -BG. In vivo studies further demonstrated that after a selective accumulation in the tumor site, the micelles could respond to hypoxic tumor tissue for rapid drug release to an effective therapeutic dosage. Thus, this multifunctional stimulus-responsive nanocarrier could be a new promising strategy to enhance the anticancer efficacy and reduce the side effects of BCNU and other CENUs.
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JOM
·
2023
·Vol. 75
·期 12
·5321-5330
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IF 2.6
Ma Yu,Zheng Yu,Xu Ming,Huang Shu,Yuan Guohui
Research on graphite as anode material for lithium-ion batteries (LIBs) has been carried out for a long time. Natural microcrystalline graphite (MG) with low cost and eco-friendly properties is a promising anode for LIBs. However, the tiny and irregular MG would cause serious side reactions with electrolytes and reduce the efficiency of energy storage. Here, the alkali fusion acid leaching method is employed for the purification of MG. After removing impurities, the purified MG is bound and wrapped by phenolic resin pyrolytic carbon to form secondary particles (PCG). Benefiting from the formation of secondary particles with a carbon shell, PCG exhibits a high specific capacity of 354.3 mAh/g and outstanding rate performance (82.7% capacity retention at 2 C). Meanwhile, outstanding cycling stability is demonstrated, with 92.7% capacity retention after 500 loops at 2 C. This research cleverly employs phenolic resin pyrolytic carbon to bind and wrap fragmented MG into secondary particles by a one-step method for high-performance LIBs anode. Such a “one stone two birds” strategy is cost-effective, environmentally friendly, and simple to operate, which is highly valuable for practical applications and provides a reference for the optimization of other graphite materials.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 7
·1-8
·
IF 5.7
Huang Yan,Sun Xuyuan,Yang Jing,Cao Zhiyuan,Wang Rujie,Li Li,Ding Yaping
A molecularly imprinted electrochemical sensor was designed for the selective determination of gatifloxacin (GTX) based on dual functional monomers. Multi-walled carbon nanotube (MWCNT) enhanced the current intensity and zeolitic imidazolate framework 8 (ZIF8) provided a large surface area to produce more imprinted cavities. In the electropolymerization of molecularly imprinted polymer (MIP), p-aminobenzoic acid (p-ABA) and nicotinamide (NA) were used as dual functional monomers, and GTX was the template molecule. Taking [Fe(CN) 6 ] 3−/4− as an electrochemical probe, an oxidation peak on the glassy carbon electrode was located at about 0.16 V (vs. saturated calomel electrode). Due to the diverse interactions among p-ABA, NA, and GTX, the MIP-dual sensor exhibited higher specificity towards GTX than MIP-p-ABA and MIP-NA sensors. The sensor had a wide linear range from 1.00 × 10 −14 to 1.00 × 10 −7 M with a low detection limit of 2.61 × 10 −15 M. Satisfactory recovery between 96.5 and 105% with relative standard deviation from 2.4 to 3.7% in real water samples evidenced the potential of the method in antibiotic contaminant determination. Graphical abstract
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 7
·1-10
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IF 2.8
Yao Aisong,Li Heng,Luo Haihang,Zhao Jianming,Xiang Jun,Chen Yi,Fan Haojun
Eethylenediamine (EDA), isophorone diamine (IPDA), diethylenetriamine (DETA), N- β- (aminoethyl)- γ- aminopropylmethyl dimethoxysilane (KH602) and polyether amine (D-230) were used as post chain extenders, a series of solvent-free high-solid content water-based polyurethanes (WPU) were prepared. The reactivity of different post chain extenders and the effects of different R values (mole ratio of –NCO/-OH) on solid content as well as the effects of chain extension degree on properties of WPU were investigated in detail. Among of water, small molecule diamine and diol, diamine with higher activity is preferred to water to complete the post chain extension reaction and improves the mechanical properties of WPU. When the R value is higher than 1.7 and the post chain extension degree is controlled at 70%, the viscosity of the solvent-free prepolymer is small enough to be emulsified, and the as-prepared WPUs show more excellent thermodynamic properties. In comparison, the cyclic chain extender such as IPDA can improve the mechanical properties and heat resistance of WPU, crosslinking type chain extenders involving DETA and KH602 can improve the heat resistance and anti-sticking of WPU coating. Whilst the WPU prepared by the chain extender containing flexible space, such as D-230, has a very low modulus and is suitable for preparing soft–type WPU.
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Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 5
·1747-1758
·
IF 2.3
Feng Caixing,Ma Haihong,Ren Fengmei,Zhou Zhengfa,Xu Weibing
In this paper, fully bio-based branched unsaturated polyester (BUPE) oligomers were synthesized by one-step solvent-free polycondensation using itaconic acid, isosorbide and glycerol as feedstocks. The branched structure was confirmed by Fourier-transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy ( 1 H NMR). The effect of the branched structure on the properties of BUPE UV curing coatings was investigated. The results showed that the introduction of a glycerol branched structure was favorable for UV curing. The BUPE UV curing coatings based on the glycerol branched structure showed higher gel content and crosslink density, which enhanced the hardness, solvent resistance and mechanical properties of the coatings. In addition, the BUPE UV curing coatings possessed extremely low surface roughness, excellent heat resistance and light transmission properties.
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