AGRICULTURAL RESEARCH
·
2024
·Vol. 13
·期 2
·198-203
·
IF 1.4
Lv Na,Li Li,Wang Na,Guo Chang-jie,Zhang Hao-yan
Snap bean ( Phaseolus vulgaris L.) is very sensitive to low temperature during postharvest storage. Methyl jasmonate (MeJA) is a volatile hormone ubiquitous in many kinds of plants and plays important role in regulating plant physiological functions. The alleviating effect of MeJA treatment on chilling injury (CI) in postharvest snap bean was studied. We found MeJA treatment markedly decreased the index of chilling injury, electrolyte leakage and content of malondialdehyde. MeJA-treated snap bean exhibited higher levels of total soluble solids and titratable acidity. Similarly, MeJA could prevent the degradation of chlorophyll and ascorbic acid. Not only total antioxidant capacity but also metal chelating ability of MeJA-treated snap bean was stronger than untreated control. MeJA-treated snap bean showed higher scavenging activities on superoxide radical (O 2 .- ), hydroxyl radical (·OH) and 1,1-diphenyl-2-trinitrophenylhydrazine radical either. MeJA application stimulated the activities of ascorbate peroxidase (APX), peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) in snap bean. In conclusion, this study reveals MeJA can be used to relieve chilling injury and maintain the quality of snap bean during low-temperature storage. 8 µM MeJA is the optimal concentration to alleviate chilling injury of snap bean.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 8
·3573-3584
·
IF 3.5
Xu Man,Luo Yongping,Zeng Linsheng,Huang Ping,Xu Shunjian,Liu Yike,Wang Yongya,Li Xianchang,xie Yu
In consideration of the increased activity of Pt-based catalysts for methanol oxidation in direct methanol fuel cells, it is necessary to apply an ideal support in the construction of Pt-based catalyst for methanol oxidation. In this study, Ag/g-C 3 N 4 nanosheets (Ag/GCNN) nanocomposites with different Ag contents were synthesized and used as the progressive support to construct Pt/Ag/GCNN catalyst. As a nitrogen-rich polymeric semiconductor, GCNN is easily coordinated with various metals. The introduction of Ag nanoparticles can improve the electrical conductivity of the catalyst and cooperate with Pt for optimizing the performance of electrocatalytic oxidation of methanol. The electrochemical experiment results demonstrated that Pt/Ag/GCNN has higher electrocatalytic activity and stability for methanol oxidation than Pt/GC and Pt/GCNN. The mass activity of Pt/Ag/GCNN-0.6 (18.66 mA mg Pt −1 ) is 7.07, 4.60 and 1.26 times that of Pt/GCNN (4.06 mA mg Pt −1 ), Pt/Ag/GCNN-0.4 (4.06 mA mg Pt −1 ) and Pt/Ag/GCNN-0.8 (14.76 mA mg Pt −1 ) at the forward peak potential. The J f / J b ratio of Pt/Ag/GCNN-0.6 is 3.31, which is bigger than that of Pt/GCCN (2.62), Pt/Ag/GCNN-0.4 (2.69), and Pt/Ag/GCNN-0.8 (2.56). A suitable mechanism was proposed to explain that Ag/GCNN supported Pt catalyst can improve the CO toxicity resistance and electrocatalytic performance. Based on the coordination of GCNN, Ag was first modified to form a support, and then the remaining coordination sites were used to support Pt. It provided a new strategy for the design of catalysts for methanol electrooxidation. Graphical abstract
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Science China-Technological Sciences
·
2023
·Vol. 66
·期 8
·2213-2224
·
IF 4.6
Li Qiang,Wu Chao,Peng YaJun,Zhang BingJian
Developing advanced cleaning systems for the removal of unwanted layers from painted surfaces is still a challenging issue that needs to be addressed in the field of cultural heritage. In this work, we proposed the use of novel polyelectrolyte hydrogels prepared via free radical polymerization and freeze-thaw methods. Zwitterionic sulfobetaine methacrylate (SBMA) was cross-linked with methylacryloyloxyethyl trimethylammonium (DMC) through covalent bonding to yield zwitterionic polyelectrolyte poly(SBMA- co -DMC) (PSD). Introducing PSD into the polyvinyl alcohol/carboxymethyl chitosan (PVA/CMC) hydrogel network enhanced the intermolecular electrostatic interactions and changed the porous structure and swelling behaviors, thus leading to improved mechanical properties. The adsorption ability of the PVA/CMC/PSD polyelectrolyte hydrogels toward dyes (rhodamine B and congo red) and metal ions (Cu 2+ and K + ) varied with increasing amounts of PSD, which could be attributed to cationic PSD tuning the net charges in the hydrogel. The cleaning effectiveness of the PVA/CMC/PSD polyelectrolyte hydrogels was assessed on wall painting mock-ups coated with soil, red paint, and soluble salts, using microscopic and spectroscopic analyses. The results showed that the hydrogel adhered to rough surfaces and removed unwanted substances effectively without leaving determinable residues, providing a possible safe and efficient method for the cleaning of important artifacts.
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高影响因子
Science China-Chemistry
·
2017
·Vol. 61
·期 2
·172-179
·
IF 4.132
Qu Jishuang,Jiang Xiaoqing,Yu Ze,Lai Jianbo,Zhao Yawei,Hu Maowei,Yang Xichuan,Sun Licheng
The development of an efficient, stable, and low-cost hole-transporting material (HTM) is of great significance for perovskite solar cells (PSCs) from future commercialization point of view. Herein, we specifically synthesize a dicationic salt of X60 termed X60(TFSI) 2 , and adopt it as an effective and stable “doping” agent to replace the previously used lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) for the low-cost organic HTM X60 in PSCs. The incorporation of this dicationic salt significantly increases the hole conductivity of X60 by two orders of magnitude from 10 −6 to 10 −4 S cm −1 . The dramatic enhancement of the conductivity leads to an impressive power conversion efficiency (PCE) of 19.0% measured at 1 sun illumination (100 mW cm −2 , AM 1.5 G), which is comparable to that of the device doped with LiTFSI (19.3%) under an identical condition. More strikingly, by replacing LiTFSI, the PSC devices incorporating X60(TFSI) 2 also show an excellent long-term durability under ambient atmosphere for 30 days, mainly due to the hydrophobic nature of the X60(TFSI) 2 doped HTM layer, which can effectively prevent the moisture destroying the perovskite layer. The present work paves the way for the development of highly efficient, stable, and low-cost HTM for potential commercialization of PSCs.
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高影响因子
RARE METALS
·
2021
·Vol. 40
·期 9
·2455-2463
·
IF 4.003
Jia Xin-Xin,Yu Xin-Zhi,Lu Bing-An
Potassium-selenium (K-Se) batteries are a promising electrical energy storage candidate because of the cost-effectiveness and material sustainability, yet they suffer from shuttle effect, volume expansion and low powder density. The development of Se-based cathode is an effective way to overcome the above issues. Here we designed a hollow nano-spherical Co-Fe bi-metallic selenide coated with N-doped carbon (denoted as CFS@N-C) as cathode for K-Se batteries. Bimetallic selenide is benefit to improve the conductivity of composite materials; N-doped carbon layer encapsulation effectively inhibits the dissolution of poly-selenides and relieves the volume expansion. The as-prepared K-Se battery exhibits excellent rate performance (300 mAh·g –1 at 1000 mA·g –1 ) and slow-charge/ultrafast-discharge capability (discharge at 5000 mA·g –1 and charge at 100 mA·g –1 with ultrahigh capacity of 227 mAh·g –1 ) with Coulombic efficiency nearly 100%. In addition, the ex-situ high-resolution transmission electron microscopy (HRTEM) images reveal that the charge–discharge mechanism of CFS@N-C is K + replaces the bimetal and forms K 2 Se. The unique design in this work may provide certain directions on researching for high power density K-storage materials.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2014
·Vol. 41
·期 8
·5809-5819
·
IF 1.54
Zhao Bing,Jiang Lili,Liu Zhuo,Deng Qigang,Wang Liyan,Song Bo,Gao Yan
A microwave-assisted, convenient, efficient, and catalyst-free procedure is described for the synthesis of 1,3-diphenyl-3-(pyridin-2-ylamino)propan-1-one derivatives by Michael addition of 2-aminopyridine to the chalcones. Short reaction times, simple reaction, easy of product isolation, high yields, and clean work-up are the advantages of this method.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 6
·5804-5813
·
IF 2.914
Meng Zhiyuan,Zhu Wentao,Wang Dezhen,Li Ruisheng,Jia Ming,Yan Sen,Yan Jin,Zhou Zhiqiang
The widespread application of bisphenols (BPs) in the industry has made them ubiquitous in the environment, causing potential environmental risks. Its unknown impacts on human being have received more and more attention. In this study, we have assessed the metabolic effects of perinatal exposure to bisphenol A (BPA) and its substitutes (bisphenol S (BPS), bisphenol F (BPF), and bisphenol AF (BPAF)) in female mice adolescent offspring and female mice adulthood offspring. 1 H NMR-based serum metabolomics showed that metabolic profiles were disturbed with BPA and its three substitutes exposure in female mice adolescent offspring and female mice adulthood offspring. In addition, age-related metabolic effects were found based on changes in serum endogenous metabolites and metabolic pathways. Specifically, metabolic pathway analysis showed that major disturbed metabolic pathways in female mice adulthood offspring compare with female mice adolescent offspring also changed significantly. With the increase of age of the female mice offspring, changes in the metabolic pathways became more obvious in the BPA treatment group. Conversely, partially disturbed metabolic pathways were restored in the BPS, BPF, and BPAF treatment groups. In conclusion, perinatal exposure to BPA and its three substitutes significantly interferes with metabolic profiles and metabolic pathways, and this metabolic effects were age-related. These results offer more detailed information about the age-related metabolic effects of perinatal exposure to BPA, BPS, BPF, and BPAF in female mice offspring and provide data for systematic evaluation of the health risk assessment of BPA and its substitutes.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 15
·11062-11077
·
IF 2.993
Xue Mingzhe,Chen Chen,Tan Yan,Ren Zhiwei,Li Bing,Zhang Cunman
Porous carbon with various structures from micropores (< 2 nm) to hierarchical pores (0–4 nm) was synthesized from biomass waste mangosteen peels via KOH activation process. Microporous carbon was obtained mainly at a low activation temperature of 700 °C or a low alkali/carbon of 3. Hierarchical porous carbon with ultrahigh surface area (> 3000 m 2 g −1 ) and pore volume (> 1.4 cm 3 g −1 ) was obtained at alkali/carbon ratio higher than 3.5 and activation temperature of 800 °C. Sulfur with a high content of 65 wt% was able to be fully accommodated into the pores of hierarchical porous carbon to form C/S composite cathode for lithium sulfur battery while in the case of microporous carbon, residual sulfur on carbon surface was detected. High specific discharge capacities of more than 800 mAh g −1 were achieved from hierarchical porous carbon/S composites at 0.5 C, and the sample synthesized at alkali/carbon of 4 and activation of 800 °C exhibits the best cycling performance. After 500 cycles at 0.5 C, a high discharge capacity of 509 mAh g −1 was maintained, indicating an excellent capacity retention. Relationship between pore characteristics of porous carbon and the electrochemical performance of its sulfur composite was discussed.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2016
·Vol. 33
·期 6
·1931-1937
·
IF 1.408
Fu Xiaoqin,Sheng Xiaoli,Zhou Yuming,Fu Zhiwei,Zhao Shuo,Zhang Zewu,Zhang Yiwei
Well-dispersed hierarchical zeolite Y, structure-directed by ionic liquid 1-methyl-3-[3'-(trimethoxysilyl) propyl] imidazolium chloride, was synthesized for the first time using a novel ultrasonic/microwave synergistic synthesis (UMSS). The time required for the synthesis of zeolite Y by UMSS method was remarkably reduced to 6 h instead of 24 h under conventional hydrothermal conditions. The structures of all samples were characterized by XRD, BET, FT-IR, SEM and TEM. The results clearly demonstrated that the UMSS is a promising strategy to achieve zeolite Y with improved crystallinity, large BET surface area, bulky mesopore volume, well-dispersed morphology, small zeolite nanoparticle. The catalytic activity of hierarchically micro-mesoporous zeolite Y was evaluated by using the alkylation of o-xylene with styrene. Mesoporous zeolite Y synthesized by UMSS method showed significantly higher catalytic activity, stability and reusability, compared with conventional hydrothermal synthesis. It might be ascribed to its large mesoporous volume, small crystal nanoparticle and high surface area, minimizing the diffusion length as the reactant molecules diffuse into the pores, and correspondingly the products diffuse out of zeolites. This study suggests that UMSS method is a good alternative for the synthesis of micro-mesoporous zeolite Y, which may be of remarkable benefit for industrial applications.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2023
·Vol. 148
·期 13
·6097-6106
·
IF 4.4
Nie Sheng,Zhong Jin-Rong,Li Yan,Zhang Yue-Fei
A series of polyacrylic salts are used as nucleating agents in isotactic polypropylene (iPP). Investigations are done on the mechanical characteristics, crystallization behavior, and melting behavior of nucleated iPP. According to the result from differential scanning calorimetry (DSC), the temperature at which nucleated iPP crystallize was 3–5 °C higher than the temperature at which pure iPP. Meanwhile, zinc polyacrylate, potassium polyacrylate, and sodium polyacrylate have the ability to induce β-crystals in iPP, according to wide-angle X-ray diffraction data. The optical microscope observation combined with DSC results shows that potassium polyacrylate had a β-nucleation effect when it had a lamellar crystal structure. When compared to pure iPP, the impact strength of iPP nucleated with sodium polyacrylate or potassium polyacrylate is improved by 23.48% and 24.35%, respectively. According to the mechanical properties results, there is no significant change in the tensile strength and flexural modulus of nucleated iPP with sodium polyacrylate and potassium polyacrylate. Without compromising its stiffness, sodium polyacrylate or potassium polyacrylate can increase the toughness of nucleated iPP.
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高影响因子
Science China-Materials
·
2023
·Vol. 66
·期 5
·1989-1996
·
IF 8.1
Yang Zhiyu,Zhao Yifei,Ueda Jumpei,Molokeev Maxim S.,Shang Mengmeng,Xia Zhiguo
Blue-light-excitable red-emitting phosphors with high thermal stability are essential for fabricating white light-emitting diodes (WLEDs). Herein, Ce 3+ -doped SrLaScO 4 (SLO:Ce 3+ ) phosphor is discovered to have an abnormal red emission band centered at 640 nm when excited at 440 nm. Spectroscopy and structural analyses confirm that Ce 3+ ions occupy the [LaO 8 ] polyhedrons competitively, generating a strong crystal field splitting and a large Stokes shift to produce a red emission. To further restrict the thermal quenching of SLO:Ce 3+ , charge-transfer engineering is implemented by incorporating a large electronegative Ga 3+ in the Sc 3+ site, which can attract more charges from nearby coordinating groups to decrease the electronic occupation at the bottom of the conduction band and thereby enlarge the band gap. Sc/Ga substitution in SrLa(Sc,Ga)O4:Ce 3+ enhances the thermal stability by increasing the intensity ratio from 15% to 31% at 150°C compared with 20°C. This is attributed to the efficient suppression of the thermally stimulated ionization process. This study presents a general design principle for discovering novel Ce 3+ -doped red phosphors with good thermal stability for WLED applications.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 5
·287
·
IF 1.784
Ding Simin,Xiao Xuling,Liu Shuhua,Wu Jie,Huang Zongyu,Qi Xiang,Li Jun
In this paper, MoS 2 /PbI 2 heterostructures were synthesized via a two-step synthesis method using vapor deposition and direct water bath heating. Raman spectroscopy and Atomic Force Microscope were used to characterize the MoS 2 /PbI 2 heterostructures. The Kelvin probe force microscope was characterized the surface potential of MoS 2 /PbI 2 heterostructures. It has shown that the surface potential has undergone a significant change transfer in the interlayer between MoS 2 and PbI 2 , which means that at the interface charge transfer occurs and the electrons transfer from MoS 2 to PbI 2 . These results provide a theoretical basis for further understanding of the electrical properties of MoS 2 /PbI 2 heterostructures.
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高影响因子
危险品化学品经营许可证（带存储）