JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 26
·期 1
·269-280
·
IF 2.647
Li Xueying,Wang Jiangang,Duan Fenyan,Tao Luwen,Xu Teng,Chen Lizhuang,Yuan Aihua,Wang Xiaolong
The electrode materials with long cycle life are important for the large-scale application of sodium ion batteries. In this work, P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0, 0.057, 0.073, 0.09) were synthesized by molten-salt method. The Ti doping content could influence the crystallographic unit cell volume, particle size, oxygen vacancies, and surface charge density of those samples. When x = 0.073, the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) exhibits superior reversible capacity and rate performance due to the appropriate synergistic effect. In particular, the initial discharge capacity of NCTO-0.073 is about 118.5 mAh g −1 at 100 mA g −1 . Even the current density gets to 1000 mA g −1 , the initial discharge capacity remains 71.7 mAh g −1 after 1000 cycling with the capacity retention of 67.90%. The electrochemical kinetics analysis further prove that the P2-type Na 0.71 Co 0.96- x Ti x O 2 ( x = 0.073) owns outstanding electrical conductivity and fast sodium ion diffusion behavior to promote the electrochemical reaction during the charging/discharging. These results will contribute to the industrialized application of stable high-performance cathodes for sodium ion batteries.
研究领域:
材料科学
·
电化学
·
能量存储
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 14
·7276-7289
·
IF 4.682
Wang Yonghan,Hu Feng,Chen Ying,Wang Hui,Fetohi Amani E.,Hao Yanan,Li Linlin,El-Khatib K. M.,Peng Shengjie
Electrocatalytic conversion from carbon dioxide with main products of carbon monoxide and hydrogen provides an economic and sustainable pathway to produce syngas, while the involved electrocatalysts with high activity and stability as well as highly tunability for CO/H 2 ratio are still rare. Here, we report a facile method to prepare palladium (Pd) nanoparticle ensembles with unique three-dimentional (3D) architecture and porosity as well as plenty of grain boundaries, which are electrocatalytically active for electrochemical carbon dioxide reduction (eCO 2 RR) to syngas. At the potential of − 0.8 V (versus reversible hydrogen electrode), the CO selectivity of such Pd nanoparticle ensembles is up to ca. 90% and the CO/H 2 ratio can be adjusted from one to six by varying the applied potentials. The syngas production on Pd nanoparticle ensembles can be further regulated by changing the reaction temperature and modified ligands. This method for fabricating Pd nanoparticle ensembles with rational tenability paves the way for the fundamental research and commercial deployment of eCO 2 RR and syngas production. Graphical abstract Pd nanoparticle ensembles with grain boundaries and high porosity were developed for tunable CO 2 conversion to syngas under ligand exchange and temperature control.
研究领域:
材料科学
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电化学
·
能源转换
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DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 6
·1711-1718
·
IF 3.186
Wu Shaohua,Su Tongtong,Liu Senqun,Cheng Dan,Zeng Rong,Ma Xiaohua,Liang Sanqi,Ding Shunmin,Chen Chao
Developing an ideal stabilizer to prevent the aggregation of nanoparticles is still a big challenge for the practical application of noble metal nanocatalysts. Herein, we develop a charge (NTf 2 − ) modified porous organic polymer (POP-NTf 2 ) to stabilize ultrasmall platinum nanoparticles. The catalyst is characterized and applied in the catalytic dehydrogenative coupling of silanes with alcohols. The catalyst exhibits excellent catalytic performance with highly dispersed ultrasmall platinum nanoparticles (ca. 2.22 nm). Moreover, the catalyst can be reused at least five times without any performance significant loss and Pt NPs aggregation. Graphic Abstract
研究领域:
材料科学
·
催化化学
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 11
·6689-6703
·
IF 4.22
Cao Yanming,Zhang Dongbin,Kong Xianggui,Zhang Fazhi,Lei Xiaodong
Abstract Introducing anion and cation vacancies into Co-based oxides is a promising strategy to promote their catalytic activity. However, the mild and effective methods for synthesizing cobalt oxide and vacancies are rarely proposed. In this work, via an innovative one-step hydrothermal process, we synthesized Co 3 O 4 -based catalyst, which was successively proven rich with oxygen vacancies (V O ) and cobalt vacancies (V Co ). As an electrocatalyst for benzyl alcohol (BA) oxidation, the vacancy-rich Co 3 O 4 on nickel foam (NF) with optimized electronic structure displayed a super high conversion (> 99%) and selectivity (> 99%) for benzoic acid (BAc) with excellent recyclability, representing one of the best Co‐based catalysts. X-ray photoelectron spectroscopy (XPS) and X-ray adsorption near-edge structure (XANES) technologies coupled with density functional theory calculations (DFT) demonstrated the obvious electronic delocalization caused by vacancies not only lowered the adsorption energy of BA and improved the intrinsic activity of catalytic Co sites for faster reaction kinetics, but also narrowed the band gap for better electrical conductivity. This work opens up a new simple synthetic idea to construct the high-performance electrocatalysts by tuning electronic structure. Graphical abstract
研究领域:
材料科学
·
电化学
·
催化
·
化工
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DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2021
·Vol. 34
·期 4
·1165-1176
·
IF 1.506
Sun Xiaoning,Song Kun,Wang Song,Sun Kangning
Fe 3 O 4 nanoparticles/iodized oil magnetic fluids (FIOMFs) have showed potential in targeted hyperthermia for liver tumors; in this paper, FIOMFs were simply and conveniently prepared by dispersing the synthesized hydrophobic Fe 3 O 4 nanoparticles (FNPs) in iodized oil; the stability, magnetothermal effects, and the biotoxicity of FIOMFs were evaluated. The results showed that the stability of FIOMFs was mainly influenced by the morphology and the size of FNPs. FNPs prepared with FeCl 3 ·6H 2 O, oleylamine (OAm), ethylene glycol (EG), and stearic acid exhibited the best suspension stability, which could suspend in iodized oil stably for a long time. Depending on the FNP content and the parameters of the alternating magnetic field (AMF), the temperature of FIOMF in AMF can reach up to more than 70 °C within 60 s, exhibited excellent magnetothermal effects. The in vitro cytotoxicity tests indicated the cytotoxicity of FNPs is mainly influenced by its concentration in cells.
研究领域:
医学
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材料科学
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生物医学工程
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DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 3
·1587-1597
·
IF 5.044
Liu Xiaohong,Li Ming,Zhang Haichuan,Chen Liheng,Fu Shiyu
A cellulose- grafted -poly( N -isopropylacrylamide) (cellulose- g -PNIPAAm) copolymer with thermo-responsivity was synthesized using homogeneous activators regenerated by electron transfer for atom transfer radical polymerization (ARGET-ATRP). The prepared copolymer dispersed at low concentration in water or phosphate-buffered saline (PBS) at 25 °C could self-assembly into micelles at 37 °C. The size and morphology of these micelles were determined by dynamic light scattering and transmission electron microscopy. The copolymer at a concentration over 4.2% by weight in water formed an injectable thermo-responsive hydrogel that was composed of micelles when the temperature increased to 37 °C. This hydrogel was used to load the anticancer drug doxorubicin (DOX). In vitro release studies demonstrated that this hydrogel released DOX in a sustained manner. Furthermore, this cellulose-based injectable thermo-responsive hydrogel was used in cytotoxicity tests, revealing that it was very biocompatible. Based on the above results, this cellulose- g -PNIPAAm injectable thermo-responsive hydrogel has strong potential for application in smart drug delivery systems.
研究领域:
材料科学
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生物医药
·
高分子化学
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DOI
高影响因子
Food Analytical Methods
·
2019
·Vol. 12
·期 6
·1429-1438
·
IF 2.413
Duan Hui-Ling,Mou Zhao-Li,Wang Jun,Ma Shi-Yao,Zhan Han-Ying,Zhang Zhi-Qi
Two types of magnetically modified porous β-cyclodextrin polymers (PCDPs) were successfully synthesized. The first type, named MPCDPs(C), was fabricated by co-precipitating PCDPs with Fe 3 O 4 , resulting in a Brunauer–Emmett–Teller (BET) surface area of 106.68 m 2 g −1 . The second type, named MPCDPs(M), was fabricated by grafting PCDPs onto the surface of magnetic microspheres, resulting in a BET surface area of 34.63 m 2 g −1 . Both MPCDPs were found to enable effective extraction and separation of Sudan dyes from foodstuffs and environmental water. Coupled with high-performance liquid chromatography, the limits of detection for Sudan dyes were in the range of 0.013–0.054 ng mL −1 with MPCDPs(C), and 0.028–0.039 ng mL −1 with MPCDPs(M). Recoveries were between 85.8 and 102.8% for spiked food samples and 88.3 and 103.2% for spiked water samples, suggesting that the developed methods are promising for accurate quantification of Sudan dyes at trace levels in foodstuffs and environmental water.
研究领域:
分析化学
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食品科学
·
环境科学
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DOI
高影响因子
International Journal of Environmental Research
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2022
·Vol. 16
·期 2
·1-12
·
IF 3.229
Tan Mengyu,Sun Yue,Gui Jiaxi,Wang Jingli,Chen Xu,Wu Donglei
Plastics are common raw materials of products originating from human activities. Their physical nature may include disintegrated small granules or fragments with particle size less than 5 mm—microplastics (MPs) which are considered as emerging contaminant in the environment. Previous research has demonstrated that organic solid waste (OSW) was contaminated by microplastics. Subsequent to biological treatment, OSW products such as compost and biogas residues would be mixed the soil as fertilizers or conditioners; while, the MPs in these OSW would also enter the soil at the same time, imparting potential ecological risks. Thus, it is important to detect the MPs in biologically treated OSW products. However, it was unknown whether some of the digestion and separation methods could be used to effectively extract MPs in these typical OSW, limiting the research on MP abundance in these OSW and restricting the comparability of relevant studies. Therefore, the present study compared the effects of seven digestion protocols on the MPs and organic matter, and the most suitable protocol containing 30% (v/v) H 2 O 2 was determined. Furthermore, the recovery rates of spiked MPs were used to evaluate three separation methods. The results showed that the two-stage density separation of NaCl solution (ρ = 1.19 g·cm −3 ) and NaBr solution (ρ = 1.53 g·cm −3 ) was optimal, and the recovery rate of spiked MPs by two-stage density separation was higher than 86%. Based on these results, the scheme of “30% (v/v) H 2 O 2 pretreatment and two-stage density separation” was constructed for MPs extraction from biologically treated products of OSW, which could be applied to the related studies.
研究领域:
环境科学
·
生物学
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DOI
高影响因子
AMB Express
·
2022
·Vol. 12
·期 1
·1-15
·
IF 4.126
Liu Shasha,She Pengfei,Li Zehao,Li Yimin,Yang Yifan,Li Linhui,Zhou Linying,Wu Yong
According to a 2019 report from the Centers of Disease Control and Prevention (CDC), methicillin-resistant Staphylococcus aureus (MRSA) was listed as one of the “serious threats” that had become a global public challenge in hospitals and community. Biofilm-associated infections and refractory persisters of S. aureus also impede the effectiveness of conventional antibiotics that have greatly increased difficulty in clinical therapy. There is an urgent need to develop new antimicrobials with antibiofilm and anti-persister capacities, and drug repurposing is the most effective and most economical solution to the problem. The present study profiles the antimicrobial activity of ceritinib, a tyrosine kinase inhibitor, against S. aureus in vitro and in vivo. We investigated the antimicrobial efficacy of ceritinib against planktonic and persistent S. aureus by a time-killing kinetics assay. Then, antibiofilm effect of ceritinib was assessed by crystal violet staining and laser confocal microscope observation. Ceritinib showed biofilm inhibition and mature biofilm eradication, and possesses robust bactericidal activity against S. aureus persisters. We also evaluated antimicrobial efficacy in vivo using a subcutaneous abscess infection model. Ceritinib ameliorated infection in a subcutaneous abscess mouse model and only showed negligible systemic toxicity in vivo. Mechanism exploration was conducted by transmission electron microscopy, fluorescently labeled giant unilamellar vesicle assays, and a series of fluorescent dyes. In conclusion, we find ceritinib represents potential bactericidal activity against MRSA by disrupting cell membrane integrity and inducing reactive oxygen species production, suggesting ceritinib has the potential to treat MRSA-related infections.
研究领域:
微生物学
·
药理学
·
传染病
·
药物再利用
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-11
·
IF 6.408
Wang Ying,Wang Tian,Wang Minglu,Wang Jun,Xu Zhixiang,Zhang Hongyan
The simple and rapid commercial colloidal gold test strip can only be used for qualitative or semi-quantitative detection, accompanied by weak detectability and false negative experimental results. Herein, a photothermal test strip assay which combined test strip with a portable photothermal card reader was established to achieve quantitative detection with excellent detectability. According to the photothermal effect produced by gold nanoparticles (GNPs) captured on the test line, the signal could be recorded by the reader. Thirteen food hazards including veterinary drug residues and pesticide residues were tested; the photothermal detectability in actual samples were about 23 (methyl parathion), 7 (enrofloxacin), 6 (sarafloxacin), 8 (sulfadiazine), 12 (sulfamethazine), 7 (paraquat), 6 (malachite green), 11 (amantadine), 13 (nitrofurazone), 6 (diethylstilbestrol), 12 (estriol), 21 (estrone), and 26 (17β-estradiol) times better than the visual detectability. Our results demonstrated that the photothermal test strip assay could be used for sensitive, rapid, and quantitative detection of residues of food hazards. Graphical abstract
研究领域:
食品科学
·
分析化学
·
纳米技术
·
传感器与执行器
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DOI
PubMed
高影响因子
3 Biotech
·
2020
·Vol. 10
·期 5
·1-13
·
IF 1.798
Liu Zhengying,Bao Jianying,Yang Huilin,Zhang Zhibin,Yan Riming,Zhu Du
Perylenequinones (PQ), a class of naturally occurring polypeptides, are widely used as a clinical drug for treating skin diseases and as a photodynamic therapy against cancers and viruses. In this study, the effects of different carbon sources on PQ biosynthesis by Shiraia sp. Slf14 were compared, and the underlying molecular mechanism of fructose as the sole carbon to enhance PQ production was investigated by transcriptome analysis. The results indicated that fructose enhanced PQ yield to 1753.64 mg/L, which was 1.73-fold higher than that obtained with glucose. Comparative transcriptome analysis demonstrated that most of the upregulated genes were related to transport systems, energy and central carbon metabolism in Shiraia sp. Slf14 cultured in fructose. The genes involved in glycolysis and pentose phosphate pathways, and encoding citrate synthase, ATP-citrate lyase, and acetyl-CoA carboxylase were substantially upregulated, resulting in increased overall acetyl-CoA and malonyl-CoA production. However, genes involved in gluconeogenesis, glyoxylate cycle pathway, and fatty acid synthesis were significantly downregulated, resulting in higher acetyl-CoA influx for PQ formation. In particular, the putative PQ biosynthetic cluster was upregulated in Shiraia sp. Slf14 cultured in fructose, leading to a significant increase in PQ production. The results of real-time qRT-PCR and related enzyme activities were also consistent with those of transcriptome analysis. These findings provide a remarkable insight into the underlying mechanism of PQ biosynthesis and pave the way for improvements in PQ production by Shiraia sp. Slf14.
研究领域:
分子生物学
·
微生物学
·
生物技术
·
药学
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DOI
PubMed
高影响因子
Neuroscience Bulletin
·
2022
·Vol. 38
·期 12
·1457-1475
·
IF 5.271
Li Qiang,Ru Xufang,Yang Yang,Zhao Hengli,Qu Jie,Chen Weixiang,Pan Pengyu,Ruan Huaizhen,Li Chaojun,Chen Yujie,Feng Hua
Insufficient remyelination due to impaired oligodendrocyte precursor cell (OPC) differentiation and maturation is strongly associated with irreversible white matter injury (WMI) and neurological deficits. We analyzed whole transcriptome expression to elucidate the potential role and underlying mechanism of action of lipocalin-2 (LCN2) in OPC differentiation and WMI and identified the receptor SCL22A17 and downstream transcription factor early growth response protein 1 (EGR1) as the key signals contributing to LCN2-mediated insufficient OPC remyelination. In LCN-knockdown and OPC EGR1 conditional-knockout mice, we discovered enhanced OPC differentiation in developing and injured white matter (WM); consistent with this, the specific inactivation of LCN2/SCl22A17/EGR1 signaling promoted remyelination and neurological recovery in both atypical, acute WMI due to subarachnoid hemorrhage and typical, chronic WMI due to multiple sclerosis. This potentially represents a novel strategy to enhance differentiation and remyelination in patients with white matter injury.
研究领域:
神经科学
·
分子生物学
·
细胞生物学
·
神经病学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）