E-POLYMERS
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2019
·Vol. 19
·期 1
·323-329
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IF 1.491
XianRong Shen,DengZhou Xia,YiXin Xiang,JianGang Gao
In this paper, γ-valerolactone (GVL), a bio-based polar solvent, was applied as green solvent for iron(III)-catalyzed AGET ATRP without any external ligand. GVL is a fully degradable, non-toxic green solvent and has complex ability to iron halide complexes through –OCO- group. GVL as the solvent and the ligand for AGET ATRP of MMA in a controlled manner, as proved by kinetic study, the low PDI values and the increase in polymer molecular weight versus monomer conversion. Chain re-initiation experiments and 1 HNMR characterization were conducted to further confirm the living feature. Graphical
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2023
·Vol. 65
·期 2
·103-110
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IF 1.2
Tianchen Song,Xiang Yixin,Gao Jiangang,Shen Xianrong
Abstract In this paper, ethyl lactate was used as a green solvent for iron(III)-catalyzed activators generated by electron transfer atom transfer radical polymerizations of methyl methacrylate in the absence of any external ligand. The effects of amount and type of solvent were investigated. Most of the systems showed the typical features of reversible deactivation radical polymerization. The polymerization of methyl methacrylate with ethyl lactate as a solvent and a ligand proceeded in a controlled manner as demonstrated by the first-order kinetic plot, low dispersity of polymers, an increase in polymer molecular weight with rise of the monomer conversion and by chain extension experiments.
研究领域:
材料科学
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聚合物化学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2014
·Vol. 52
·期 7
·1020-1027
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IF 3.245
Danfeng Yang,Dan He,Yonggui Liao,Zhigang Xue,Xingping Zhou,Xiaolin Xie
The polar solvents, N -methylpyrrolidone (NMP), N , N -dimethylformamide (DMF), and acetonitrile (CH 3 CN) were used as ligands for iron(III)-mediated activators generated by electron transfer atom transfer radical polymerizations (AGET ATRPs) of methyl methacrylate (MMA) with various initiators and reducing agents. Polymerizations were conducted with a molar ratio of [MMA] 0 /[initiator] 0 /[FeBr 3 ] 0 /[reducing agent] 0 = 100:1:1:0.5 and a volume ratio of MMA/solvent = 2:1 at 60 °C to investigate the effects of initiator, solvent and reducing agent, and most of the systems showed the typical features of “living”/controlled radical polymerization. In order to get a deeper understanding of the mechanism, the amount of the reducing agent was changed to study the polymerization behavior. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 1020–1027
研究领域:
高分子化学
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材料科学
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高影响因子
E-POLYMERS
·
2015
·Vol. 16
·期 1
·41-47
·
IF 0.569
Xue-Hui Zhan
The initiators for continuous activator regeneration (ICAR) atom transfer radical polymerization (ATRP) of methyl methacrylate (MMA) were investigated in microemulsion under light irradiation with ethyl 2-bromoisbutyrate (EBiB) as an ATRP initiator, ferric chloride hexahydrate (FeCl 3 ·6H 2 O) as a catalyst, N,N,N′,N′-tetramethyl-1,2-ethanediamine (TMEDA) as a ligand, and azobisisobutyronitrile (AIBN) as an initiator and reducing agent. The linear dependence of ln([M] 0 /[M]) on polymerization time was observed, indicating that the polymerization was living polymerization. Furthermore, the number-average molecular weights (Mn), gel permeation chromatography (GPC) and molecular weight distributions (MWD) of the PMMA obtained from GPC were controlled. The product was characterized by 1 H nuclear magnetic resonance (NMR) and GPC. The living features were verified by chain-extended with MMA with the obtained PMMA as macroinitiator.
研究领域:
高分子化学
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材料科学
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高影响因子
BIORESOURCE TECHNOLOGY
·
2025
·
IF 9
Quan Liao,Lianpeng Sun,Xianglin Qin,Ming Chen,Xinzhe Zhu,Chao Yang,Ruo-hong Li
Carbon chain elongation plays a pivotal role in biomass valorization by enabling the efficient conversion of organic substrates into higher-value biochemicals. Ethanol is a key substrate in chain elongation, yet how its oxidation reshapes carbon flux under complex electron transfer networks remains unclear. Based on an open-culture system, this study elucidates how iron species regulate ethanol oxidation. Metagenomic analysis revealed that iron acting as an electron acceptor (e.g., hematite, magnetite) enhanced electron transfer and iron respiration, while serving as an electron donor (e.g., iron powder) activated ethanol metabolism and promoted ATP generation to couple it with chain elongation pathways. These processes improved ethanol oxidation efficiency, redirected carbon flux toward acetate accumulation, and facilitated even-chain elongation of acetate. This study demonstrates an iron-regulated ethanol self-upgrading pathway with significant potential. However, in the presence of fermentation substrates, this phenomenon may reduce substrate conversion efficiency and alter product selectivity. To quantitatively characterize these processes, an integrated evaluation method for ethanol oxidation and self-upgrading was established, providing a robust analytical framework for related phenomena. Overall, this work uncovers the mechanism of bio-iron-mediated carbon flux reorganization and offers both theoretical and practical guidance for the development of advanced ethanol valorization systems and resource-efficient solid waste utilization strategies.
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PubMed
高影响因子
Cell and Bioscience
·
2024
·Vol. 14
·期 1
·1-18
·
IF 6.1
Maimaiti Yasenjiang,Su Ting,Zhang Zhanying,Ma Lingling,Zhang Yuan,Xu Hong
This study investigates NADPH oxidase 4 (NOX4) involvement in iron-mediated astrocyte cell death in Alzheimer’s Disease (AD) using single-cell sequencing data and transcriptomes. We analyzed AD single-cell RNA sequencing data, identified astrocyte marker genes, and explored biological processes in astrocytes. We integrated AD-related chip data with ferroptosis-related genes, highlighting NOX4. We validated NOX4’s role in ferroptosis and AD in vitro and in vivo. Astrocyte marker genes were enriched in AD, emphasizing their role. NOX4 emerged as a crucial player in astrocytic ferroptosis in AD. Silencing NOX4 mitigated ferroptosis, improved cognition, reduced Aβ and p-Tau levels, and alleviated mitochondrial abnormalities. NOX4 promotes astrocytic ferroptosis, underscoring its significance in AD progression.
研究领域:
神经科学
·
分子生物学
·
基因组学
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神经退行性疾病
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DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2023
·
IF 6.8
Qingyun He,Wuduo Zhao,Peiru Luo,Lingyun Wang,Qiannan Sun,Wenfen Zhang,Dan Yin,Yanhao Zhang,Zongwei Cai
As one of the most important transportation hubs and industrial bases in China, Zhengzhou has suffered from serious PM 2.5 pollution for a long time. However, the investigation of contamination status and possible exposure risks of environmentally persistent free radicals (EPFRs) in PM 2.5 from Zhengzhou is rare. In this work, a comprehensive study of pollution levels, seasonal variations, sources, and potential health risks of PM 2.5 -bound EPFRs in Zhengzhou was conducted for the first time. The atmospheric concentrations of EPFRs in PM 2.5 from Zhengzhou ranged from 1.732 × 10 12 spin m −3 to 7.182 × 10 14 spin m −3 between 2019 and 2020. Relatively serious contamination was noticed in winter and spring. Primary fossil fuel combustion and Fe-mediated secondary formation were apportioned as possible sources of PM 2.5 -bound EPFRs in Zhengzhou. Moreover, to avert the bias of the toxicity assessment induced by utilization of incompletely extracted EPFRs from sample filter, simulatively generated EPFRs were applied to toxicological evaluations (cell viability and reactive oxygen species assays). Corresponding experimental dosages were based on the estimated adults’ annual exposure amounts of EPFRs in real PM 2.5 samples. The results elucidated that EPFRs might cause growth inhibition and oxidative stress of human lung cells, suggesting the possible exposure-induced health concerns for local people in Zhengzhou. This study provides practical information of real contamination status of PM 2.5 -bound EPFRs in Zhengzhou, which is favorable to local air pollution control and reduction of exposure risks on public health in central China.
研究领域:
环境科学
·
公共卫生
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毒理学
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空气污染
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Siqi Zhang,Ziang Kong,Han Wang,Qun Yan,Dimitris V. Vayenas,Guangsheng Zhang
In this study, activated biochar (BC), nano zero-valent iron (nZVI) and biochar supported nano zero-valent iron (BC-nZVI) were used to remove cathodic nitrate in bioelectrochemical system (BES). With an initial NO 3 – -N concentration of 100 mg/L, it was found that the complete nitrate removal could be observed within 28 h for the group of BC-nZVI, whereas the accumulated ammonia reached 63.33 mg/L. Meanwhile, nitrate removal reaction rate constants reached 0.171, 0.110, 0.023 and only 0.010 h −1 for BC-nZVI, nZVI, BC and the Control groups, respectively. Besides, enzymatic activity of nicotinamide adenine dinucleotide (NADH) and nitrous oxide reductase (NOS) of the BC-nZVI group reached the peak faster than three other groups. As a carrier for nZVI, loading of nZVI onto BC could increase the surface area of BC-nZVI other than nZVI for microbial aggregation, while embedded nZVI would contribute to the granulation of sludge and nitrate reduction. Moreover, Cyclic Voltammetry (CV) and chronoamperometry (CA) indicated that BC-nZVI group obtain better electrochemical performances. Importantly, it was found that not only abundances of microbial genus, but relative abundances of those iron mediated enzymes responsible for electro-consuming, hydrogen production and preferential ammonia accumulated nitrate removal could all be enriched. Therefore, BC-nZVI could be implemented to enhance the nitrate removal at biocathode in BES.
研究领域:
环境工程
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电化学
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微生物学
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水处理
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2014
·
IF 4.638
Zhiguo Zhang,Qing Tian,Jingjing Qian,Qingfeng Liu,Tongxin Liu,Lei Shi,Guisheng Zhang
An efficient and Brønsted acid free one-pot protocol to directly generate structurally sophisticated α-formylpyrrole derivatives in moderate to good yields has been demonstrated, involving an iron-mediated domino oxidation/formylation reaction of readily available 2,3-dihydro-1H-pyrroles in dimethyl sulfoxide and air atmosphere, in which dimethyl sulfoxide acts as the formyl donor. A possible mechanism is presented.
研究领域:
有机化学
·
合成化学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）