JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2024
·
IF 2.6
Li Gang,Ren Haifang,Geng Chunping,Wu Xiang
Electrical energy storage devices (EES) play an important role in the development of portable electronic devices, power grids, and electric vehicles. Supercapacitors (SCs) become the focus of the EES field due to their high power density and high energy density. ZnCo 2 O 4 ternary metal oxides show considerable potential as electrodes for SCs. In this work, Ni(OH) 2 and PPy materials are combined on the surface of ZnCo 2 O 4 samples. The synthesized products possess a specific capacitance of 1256 C/g at 1 A/g and an energy density of 69 Wh/kg at 1350 W/kg. Moreover, the assembled device retains 81% of its capacity after being fully charged and discharged 10,000 times.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
SCIENTIA HORTICULTURAE
·
2023
·
IF 4.3
Xiaoqian Qu,Xince Wang,Maorun Fu,Jianfeng Cheng,Jingjing Liu,Xianghua Wang,Jia Li,Jinjin Wang,Ziqi Wang,Fei Sun
The concentrations of (E) -2-hexenal (E2H) have obvious correlation with the color change process in tomatoes during ripening. It is proposed that E2H may play a role in regulating the chloroplast degradation. In this study, the exogenous E2H was applied to tomato fruits and plants to create a higher concentration of E2H atmosphere than naturel released. A set of indices in response to E2H were detected. The color change was inhibited. The ethylene pathway and the involved genes were limited. The results of subcellular structure changes, the fatty acid profiles and the malondialdehyde (MDA) content supported that the chloroplast membranes were specifically degraded. The hydroperoxide lyase (HPL) and the lipoxygenase (LOX) pathway was activated to decompose the free fatty acids. In tomato plants at the harvest stage, E2H did not affect the ripe tomatoes, but inhibited the color changes of green tomatoes, accelerated the withering of the leaves and the branches, and made the fruits fall off easier. The chlorophagy was activated and the autophagosomes were observed to decompose the chloroplasts in leaves. In conclusion, E2H accelerated the chloroplast degradation, by which the color changes were regulated.
研究领域:
植物学
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分子生物学
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2019
·
IF 2.12
Qiang Liu,Peijun Cai,Xiangyu Wan,Shuai Zhang,Kai Du,Qiang Yin
Two neodymium β -diketonates metal-organic complexes, Nd(TTA) 3 TPTZ ( 1 ) and Nd(BFA) 3 TPTZ ( 2 ), have been synthesized by using two β -diketone ligands 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione (HTTA) and 4,4,4-trifluoro-1-phenyl-1,3-butanedione (HFBA), and a macrocyclic conjugate ligand, 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ). The crystal structures of these two complexes were determined by single crystal X-ray diffraction. The X-ray diffraction analysis showed that each neodymium ion in the two complexes formed a Nine-Coordinated structure with six oxygen atoms of HTTA (or HBFA) ligands and three nitrogen atoms of TPTZ ligand by the characteristic of triclinic with P 1 ( — ) space group both. In the crystal structure of the two complexes, a very obvious aromatic donor-acceptor interaction can be observed between adjacent TPTZ ligand molecules, which play an important role in the formation of three-dimensional structures. The complexes were also characterized by infrared spectroscopy , elemental analysis, thermogravimetric and fluorescence spectra . Fluorescence analysis showed that the two complexes exhibited characteristic neodymium-centered emission due to the significant antenna effect of these ligands.
研究领域:
化学
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材料科学
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DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 223
·期 3
·2100340
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IF 2.527
Jianxiong Zhang,Junjin Duan,Dong Chen,Yuhong Ma,Wantai Yang
A direct photolysis reversible addition-fragmentation chain transfer (RAFT) polymerization of (meth)acrylates is developed with 2-cyano-2-propyldodecyl trithiocarbonate (TTP), which plays the dual role as photoinitiator and chain transfer agent. The polymerizations can be efficiently activated by blue light while maintaining a linear increase in M n versus conversion. With poly(methyl methacrylate)-TTP (PMMA-TTP, M n = 6700 g mol –1 , Ð = 1.29) as precursor, a higher molecular weight PMMA ( M n = 14 600 g mol –1 , Ð = 1.67) by chain extension, and a series of block copolymers, including poly(methyl methacryalte)- b -poly(glycidyl methacrylate), poly(methyl methacrylate)- b -poly(tert-butyl methacrylate), and poly(methyl methacrylate)- b -poly(benzyl meacrylate)(PMMA- b -PBnMA), are prepared. The M n,NMR = 14 900 g mol –1 of PMMA- b -PBnMA measured by NMR is very close to M n,GPC = 14 200 g mol –1 determined by gel permeation chromatography. Furthermore, the polymerization of acrylates exhibits higher controllability in regarding to dispersity ( Ð < 1.20) compared to those of polymethacrylates ( Ð = 1.10–1.80). With poly(methyl acrylate) (PMA-TTP, M n = 11 900 g mol –1 , Ð = 1.09) as macro-RAFT agent, a higher molecular weight PMA ( M n = 23 500 g mol –1 , Ð = 1.28) by chain extension, and PMA- b -PBnA ( M n = 26 500 g mol –1 , Ð = 1.19) are also prepared. A positive synergic effect is demonstrated by enhanced apparent polymerization rates at elevated temperature. For example, the apparent polymerization rates of MA increases from 0.0860 to 0.115 h –1 with temperature rising from 32 to 50 °C.
研究领域:
高分子化学
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材料科学
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光化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Xue Dong,Qiang Yan,Zhipeng Wang,Xiaogui Feng,Jing Chen,Chao Xu
Group separation of actinides (An, including U, Np, Pu, and Am) from lanthanides (Ln) is of great significance for nuclear resources recycling and long-term radiotoxicity reduction. But this task represents a big challenge due to the chemical complexity of the actinides. In the present work, we proposed a strategy for group An/Ln separation by oxidizing the actinides to hexavalent oxidation states and then selectively extracting them from lanthanides by a sterically hindered ligand, 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (EHEHPA). The intrinsic selectivity of EHEHPA to hexavalent actinides over trivalent/tetravalent lanthanides affords single-stage An/Ln separation factors in the range of 102–105, depending on the specific actinides or lanthanides. The selective mechanism of An(VI)/Ln(III/IV) was analyzed by means of UV–vis absorption and mass spectroscopies, which suggests that the Ln(III/IV)/EHEHPA and An(VI)/EHEHPA complexes possess similar metal/ligand stoichiometries but the former one may consist of more hydrophilic nitrate ion or water molecules, thus leading to high selectivity to An over Ln by EHEHPA.
研究领域:
核化学
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放射化学
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环境科学
·
分析化学
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DOI
高影响因子
Minerals
·
2023
·Vol. 13
·期 10
·1322
·
IF 2.5
Xiaoliang Zhang,Yangge Zhu,Zhiqiang Zhao,Peilong Wang
Dolomite, a prominent calcium-bearing gangue mineral found in carbonate-type zinc oxide ores, poses a significant challenge for effective flotation separation alongside smithsonite due to their highly similar surface properties. The present study explores the potential of 2-(4,4-dimethylpentan-2-yl)-5,7,7-trimethyloctanoic acid (2-DMPT) as a collector for the reverse flotation of smithsonite from dolomite. Micro-flotation experiments indicated that saponified 2-DMPT exhibited superior collecting ability and selectivity for dolomite over smithsonite under highly alkaline conditions. Specifically, the flotation recovery of dolomite reached 62%, whereas only 6% of smithsonite was recovered in the flotation foam products. Zeta potential and attenuated total reflectance–Fourier transform infrared (ATR-FTIR) analysis revealed that changes in pH values had minimal influence on the collector’s adsorption onto dolomite, while significantly hindering its adsorption on the smithsonite surface. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis showed that 2-DMPT could form hydrophobic complexes with the active Ca2+sites on the dolomite surface at pH 11.5. However, the interaction between smithsonite and carboxylic groups of 2-DMPT under the same conditions was relatively weaker, facilitating their reverse flotation separation. As a result, 2-DMPT shows promise as a potential collector for the reverse flotation process, effectively removing dolomite from smithsonite and reducing acid consumption in subsequent acid-leaching processes.Keywords:smithsonite;dolomite;reverse flotation;highly alkaline conditions;saponified 2-DMPT
研究领域:
矿物加工工程
·
表面化学
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DOI
高影响因子
WORLD JOURNAL OF GASTROENTEROLOGY
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2024
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IF 4.3
Kai-Di Chen,Kui-Ling Wang,Chen Chen,Yi-Jia Zhu,Wen-Wen Tang,Yu-Ji Wang,Ze-Peng Chen,Lin-Hai He,Yu-Gen Chen,Wei Zhang
BACKGROUND Constipation, a highly prevalent functional gastrointestinal disorder, induces a significant burden on the quality of patients' life and is associated with substantial healthcare expenditures. Therefore, identifying efficient therapeutic modalities for constipation is of paramount importance. Oxidative stress is a pivotal contributor to colonic dysmotility and is the underlying pathology responsible for constipation symptoms. Consequently, we postulate that hydrogen therapy, an emerging and promising intervention, can serve as a safe and efficacious treatment for constipation. AIM To determine whether hydrogen-rich water (HRW) alleviates constipation and its potential mechanism. METHODS Constipation models were established by orally loperamide to Sprague-Dawley rats. Rats freely consumed HRW, and were recorded their 24 h total stool weight, fecal water content, and charcoal propulsion rate. Fecal samples were subjected to 16S rDNA gene sequencing. Serum non-targeted metabolomic analysis, malondialdehyde, and superoxide dismutase levels were determined. Colonic tissues were stained with hematoxylin and eosin, Alcian blue-periodic acid-Schiff, reactive oxygen species (ROS) immunofluorescence, and immunohistochemistry for cell growth factor receptor kit (c-kit), PGP 9.5, sirtuin1 (SIRT1), nuclear factor-erythroid-2-related factor 2 (Nrf2), and heme oxygenase-1 (HO-1). Quantitative real-time PCR and western blot analysis were conducted to determine the expression level of SIRT1, Nrf2 and HO-1. A rescue experiment was conducted by intraperitoneally injecting the SIRT1 inhibitor, EX527, into constipated rats. NCM460 cells were induced with H 2 O 2 and treated with the metabolites to evaluate ROS and SIRT1 expression. RESULTS HRW alleviated constipation symptoms by improving the total amount of stool over 24 h, fecal water content, charcoal propulsion rate, thickness of the intestinal mucus layer, c-kit expression, and the number of intestinal neurons. HRW modulated intestinal microbiota imbalance and abnormalities in serum metabolism. HRW could also reduce intestinal oxidative stress through the SIRT1/Nrf2/HO-1 signaling pathway. This regulatory effect on oxidative stress was confirmed via an intraperitoneal injection of a SIRT1 inhibitor to constipated rats. The serum metabolites, β-leucine (β-Leu) and traumatic acid, were also found to attenuate H 2 O 2 -induced oxidative stress in NCM460 cells by up-regulating SIRT1. CONCLUSION HRW attenuates constipation-associated intestinal oxidative stress via SIRT1/Nrf2/HO-1 signaling pathway, modulating gut microbiota and serum metabolites. β-Leu and traumatic acid are potential metabolites that upregulate SIRT1 expression and reduce oxidative stress.
研究领域:
胃肠病学
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药理学
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分子生物学
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微生物学
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代谢组学
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产品关联
DOI
PubMed
高影响因子
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2016
·Vol. 37
·期 12
·1955-1960
·
IF 0.793
Xiaoping Chang,Zequan Liu,Qiang Zhang
The samples of sodium salt of methacrylic acid/acrylic acid-2-isooctyl ester/2-acrylamido-2-methylpropanesulfonic acid terpolymer (SSMAA) were synthesized by free radical solution polymerization. The absolute weight-average molar mass ( M w ) and polydispersity ( M w / M n ) of the polymers were successfully determined using aqueous-based gel permeation chromatography coupled with multiangle laser light scattering. The results show that mixed solutions of highly concentrated buffered salt (NaNO 3 or NaCl and NaH 2 PO 4 ) and organic solvent modifier (methanol) are needed to eliminate the undesirable interactions between polymer and polymer, and between polymer and stationary phase. Dynamic light scattering was first used to investigate the aggregation behavior of SSMAA in a variety of potential mobile phase compositions and screen the optimum compositions. The M w and M w / M n values of the three samples prepared with different amount of initiator are 13500, 5820, and 2490 g/mol and 1.52, 1.45, and 1.47, respectively.
研究领域:
化学
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高分子科学
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产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Ying Fan,Ran Cen,Peihui Shan,Carl Redshaw,Hang Cong,Xin Xiao,Qingmei Ge
The supramolecular assembly of symmetrical tetramethylcucurbit[6]uril (TMeQ[6]) and 2-picolylamine (AMPy) has been investigated via various techniques, including ultraviolet–visible (UV–vis) and nuclear magnetic resonance spectroscopy, isothermal titration calorimetry (ITC), and X-ray crystallography. The results indicated that TMeQ[6] could encapsulate the AMPy guest molecule to form a stable inclusion complex. The rotational restriction of the guest in the cavity of TMeQ[6] resulted in a large negative value of entropy. The X-ray crystal structure of the 1:1 inclusion complex between TMeQ[6] and AMPy revealed that AMPy exists in the elliptical cavity of TMeQ[6].
研究领域:
化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Advanced Therapeutics
·
2019
·Vol. 2
·期 5
·1800136
·
IF 0
Yalu Zou,Yuanyuan Wang,Shengsheng Zhang,Yuntang Wu,Xiaofei Liu
Islet β cell failure is a critical metabolic disorder in the development of type 2 diabetes (T2DM), and the decreased viability and dysfunction of β cells accelerate diabetic pathogenesis in association with higher mortality. In this study, the therapeutic effects of chitooligosaccharide biguanide (COSG), which is similar in structure to metformin and has negligible side effects, on islet β-cell dysfunction and the possible mechanism are explored. Streptozocin-induced diabetic rats are administered COSG via daily intragastric gavage for 8 weeks. COSG significantly controlled body weight loss, attenuated glucose levels in blood and urine, and increased serum insulin. Histological examination of the pancreas reveals that COSG also alleviated pancreatic atrophy in T2DM rats. Furthermore, COSG stimulated insulin receptor substrate-2 (IRS-2) signaling in rat islet β cells, thereby mediating the activation of the phosphatidylinositol 3 kinase/protein kinase (PI3K/Akt) signaling pathway. In addition, COSG promoted downstream forkhead transcription factor O1 (FoxO1) nuclear output to potentially activate pancreas duodenum homeobox-1 (PDX-1)/glucose transporter type-2 (GLUT-2)/glucose kinase (GCK) pathway-regulated insulin secretion. COSG also inhibited the glycogen synthase kinase-3β (GSK-3β)/caspase-3 pathway to prevent cell apoptosis. The intrinsic protective effects of COSG on the impaired insulin signaling system to delay β-cell apoptosis, increase β-cell growth and proliferation, improve β-cell function and promote insulin secretion highlight the possibilities of COSG as a novel strategy for the prevention of T2DM.
研究领域:
医学
·
内分泌学
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产品关联
DOI
JOURNAL OF MOLECULAR LIQUIDS
·
2019
·
IF 4.561
Yi Yu,Xiaoqiang Gao,Zhouxuan Zang,Li Xu,Guoji Liu
In this work, the solubility of 2-methyl-1,4-naphthoquinone (2-MNQ, Vitamin K3) and its by-product 2-naphthaldehyde in binary and ternary systems was studied. Three phase diagrams were established based on the experimental solubility data. Each ternary phase diagram contains three crystallization regions (pure 2-MNQ, pure 2-naphthaldehyde and mixture of 2-MNQ and 2-naphthaldehyde), two co-saturated curves and one co-saturated point. The crystalline region of 2-MNQ is larger than that of 2-naphthaldehyde at three temperatures (283.15, 293.15 and 303.15) K. The solubility of the binary (2-MNQ + ethanol and 2-naphthaldehyde + ethanol) system was correlated by λh equation, modified Apelblat equation and NRTL model. The ternary (2-MNQ + 2-naphthaldehyde + ethanol) system was correlated by NRTL model. The calculated values agree well with the determined solubility data. Interaction energy between solute and solvent molecules were calculated to illustrate the solubility behavior of 2-MNQ and 2-naphthaldehyde in ethanol. RDF shows that when adding pure 2-naphthaldehyde in solution of 2-MNQ + ethanol, the interaction between 2-MNQ and ethanol molecules will become stronger, which leads to an increase in solubility of 2-methyl-1,4-naphthoquinone. This study can provide basic data and theoretical foundation for the separation process.
研究领域:
化学工程
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分子生物学
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药物化学
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DOI
高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Zhipeng He,Huichao Liu,Guang Yang,Chi Jiang,Muwei Ji,Jiali Yu,Mingliang Wang,Caizhen Zhu,Jian Xu
Cyclization reaction of poly(acrylonitrile-co-2-acrylamido-2-methylpropane sulfonic acid) [P(AN-co-AMPS)] copolymer during thermal oxidative stabilization (TOS) process was investigated by FTIR and two dimensional (2D) correlation analysis technique. The results showed the mechanism of cyclization reaction at different temperatures were varying. At 200 °C, the cyclization reactions generated by autocatalytic cyclization mechanism. While at higher temperatures, the cyclization reactions took place through ionic cyclization mechanism and free radical cyclization mechanism. The AMPS comonomer could reduce the heat release of cyclization reactions and improve the stability at 200 and 230 °C. At higher temperatures, the cyclization reactions were facilitated rapidly. However, the oxidation and degradation reactions were also intense, which will cause the molecular chain to break and defects in the final carbon fibers (CFs). This research has theoretical guiding significance for the optimization of heat treatment conditions for PAN copolymers used as CFs.
研究领域:
高分子化学
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材料科学
·
光谱学
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DOI
高影响因子
危险品化学品经营许可证（带存储）