JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 17
·21858-21868
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IF 2.478
Wang Jinmao,Yan Hong,Long Yumei,Li Weifeng
In this work, a series of h -BN/ α -SnWO 4 (BN/SW) nanocomposites with different h -BN concentrations (0.3–1.0 wt%) were prepared through a hydrothermal method. The composition, structure and morphology of BN/SW nanocomposites were systematically investigated. The formation of BN/SW heterojunction was evidenced by Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). The BN/SW composites showed plate-to-plate structure consisting α -SnWO 4 and h -BN nanoplates. The optical and photoelectrochemical studies revealed that the decorating of h -BN can significantly facilitate the separation of the photo-created charge carries due to the formation of heterostructure. As a result, BN/SW hetero-structure exhibited the superior photocatalytic performance under visible light, which was confirmed by the photo-degradation of methyl orange (MO) and tetracycline (TC). Especially, the BN/SW-0.5 sample has the best rate constant of 0.0323 min −1 , which is 4.6 times larger than that of α -SnWO 4 . Based on trapping experiment, the h + radical was identified as the dominant reactive species, and ·O 2 − and ·OH also made contribution to the photocatalysis. In addition, the photocatalytic enhancement mechanism of BN/SW heterojunction was proposed. This study shed light on the roles of h -BN in the design of photocatalysts with high-performance.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2013
·
IF 3.535
Hao Shan,Changbai Liu,Li Liu,Shouchun Li,Lianyuan Wang,Xiaobo Zhang,Xiaoqing Bo,Xiao Chi
Pure and La-doped (5 wt%, 7 wt% and 10 wt%) α-Fe 2 O 3 nanotubes are synthesized by an electrospinning method and followed by calcination . The as-synthesized nanotubes are characterized by scanning electron microscope (SEM) and X-ray powder diffraction (XRD). Compared with pure α-Fe 2 O 3 nanotubes, La-doped α-Fe 2 O 3 nanotubes exhibit improved acetone sensing properties at 240 °C. The response of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone is about 26, which is 10 times larger than that of pure α-Fe 2 O 3 nanotubes. The response and recovery times of 7 wt% La-doped α-Fe 2 O 3 nanotubes to 50 ppm acetone are about 3 and 10 s, respectively. Moreover, 7 wt% La-doped α-Fe 2 O 3 nanotubes show a good selectivity to acetone.
研究领域:
材料科学
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传感技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2015
·
IF 2.752
Chang Su,Yongcun Zou,Xiaofeng Xu,Li Liu,Zhen Liu,Lili Liu
Pure and Nd-doped porous α-Fe 2 O 3 nanotubes were successfully synthesized via a facile single-capillary electrospinning method, followed by calcination treatment. The morphologies of the as-prepared samples were characterized by scanning electron microscopy. The crystal structures and components were determined by X-ray diffraction and energy-dispersive X-ray spectroscopy, respectively. The gas-sensing properties of the as-prepared samples were studied, and the results indicate the ultrahigh sensitivity of Nd-doped porous α-Fe 2 O 3 nanotubes to acetone. The response of Nd-doped porous α-Fe 2 O 3 nanotubes to 50 ppm of acetone is about 44 at an operating temperature of 240 °C, which is 17 times larger than that of pure porous α-Fe 2 O 3 nanotubes. Furthermore, the lowest detection limit of acetone is 500 ppb, with a response of 2.4. The response and recovery times to 50 ppm of acetone are about 19 and 50 s, respectively. In addition, the Nd-doped porous α-Fe 2 O 3 nanotubes possess good selectivity and long-term stability.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
NANO
·
2022
·
IF 1.438
Lixia Chen,Qianqian Chen,Zhengyan Xue,Shanshan Liu,Shun Wang,Sankui Xu
The design and controllable synthesis of semiconductors at the nanoscale level is a critical strategy for adjusting the performance of catalysts. In this work, size-controlled α -Fe 2 O 3 with nanocubic structure is fabricated through a simple solvothermal method. The growth process of cubic α -Fe 2 O 3 nanocrystals is investigated by time-dependent solvothermal reaction experiments, which displays a typical Oswald ripening mechanism: flower-like nucleation, followed by growing and ripening of nuclei into different morphologies and sizes during the solvothermal process. The UV–vis absorption results revealed that α -Fe 2 O 3 nanocubes present a size-dependent optical property. The α -Fe 2 O 3 -10h with an average particle size of 37 nm exhibits good crystallinity, large specific surface area and high UV–vis light absorption, subsequently resulting in the highest photocatalytic efficiency together with excellent stability.
研究领域:
材料科学
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纳米技术
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光学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 12
·5319-5333
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IF 4.5
Wang Yun,Tan Hongjie,Sang Lexian,Xie Yunying,Jia Fuchao,Zhou Tong,Yin Guangchao,Sun Fazhe,Wang Xiaomei
An optimized acetone gas sensor based on Ti 3 C 2 / α -Fe 2 O 3 (TF) composite materials was synthesized using microwave and etching methods. The structures, morphology and composition of the TF composites were characterized via XRD, XPS, SEM and TEM. The crystal of α -Fe 2 O 3 porous nanorods is hexagonal, and the α -Fe 2 O 3 nanoclusters formed from α -Fe 2 O 3 nanorods were adhered adequately on the lamellar Ti 3 C 2 MXene in the TF composite. The specific surface area and surface defects of the TF composites increased compared with pure α -Fe 2 O 3 nanocluster material, thus exposing a large number of gas adsorption sites. Furthermore, the excellent electrical conductivity and high free charges transfer ability of Ti 3 C 2 MXene provided more electrons for the gas-sensitive reaction and enhanced the transmission capacity of gas-sensitive reaction electrical signal, respectively. The Schottky barriers were formed at the interface of α -Fe 2 O 3 and Ti 3 C 2 MXene increasing the resistance of TF gas sensor in air, which is beneficial to the response of TF gas sensor. So, the gas-sensitive performance of TF gas sensor to acetone was greatly improved. The response of TF gas sensor to 100 ppm acetone was up to 23.38, which was nearly 2.3 times higher than pure α -Fe 2 O 3 gas sensor. The lower detection limit of TF gas sensor could be as low as 1 ppm. In addition, the TF gas sensor had excellent selectivity, long-term repeatability and stability for acetone.
研究领域:
材料科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE AND TECHNOLOGY-MYSORE
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2018
·Vol. 55
·期 9
·3640-3646
·
IF 1.797
Lou Wenjuan,Chen Yongsheng,Ma Hanjun,Liang Guizhao,Liu Benguo
Tannic acid widely exists in plants, which forms a part of human diet. The antioxidant activity of tannic acid was evaluated by the chemical and cellular antioxidant assays. And its α-amylase inhibitory activity and behavior were also investigated. It was found that hydrogen- and electron donating capacities of tannic acid were higher than those of tertiary butylhydroquinone (TBHQ) based on reducing power, ABTS and DPPH radical scavenging assays. But for its low hydrophobic property, the antioxidant activity of tannic acid in linoleic acid system was inferior to that of TBHQ. In the cellular antioxidant assay, tannic acid showed the higher activity than gallic acid in the “PBS wash” protocol, which could attribute to its high binding capacity of cell membrane. Compared with acarbose, tannic acid possessed the stronger α-amylase inhibitory capacity. And the static fluorescence quenching of α-amylase in the presence of tannic acid could be also observed, which was caused by their binding interaction.
研究领域:
食品科学
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生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOORGANIC CHEMISTRY
·
2023
·
IF 5.1
Honghui Liu,Puxin Huang,Xingchen Wang,Yufang Ma,Jing Tong,Jing Li,Hong Ding
This study investigated the inhibitory potential of a series of synthesized compounds (L1-L27) on α-glucosidase. Among them, compound L22 showed significant inhibitory effect. Through enzymatic kinetics studies, we demonstrated that L22 acts via a non-competitive inhibition mode with a K i value of 2.61 μM, highlighting its high affinity for the enzyme. Molecular docking studies revealed the formation of hydrogen bonds between L22 and α-glucosidase and diverse interactions with neighboring amino acid residues. Furthermore, molecular dynamics simulations confirmed the stability of the L22-α-glucosidase complex. In a mouse model of type 2 diabetes, treatment with L22 significantly lowered fasting blood glucose levels, and reduced insulin resistance, suggesting its potential as a therapeutic agent for type 2 diabetes. Furthermore, L22 showed a protective effect against oxidative stress in the liver and alleviated liver and pancreatic abnormalities. These results provide valuable insights into the mechanism of action of L22 and its potential applications to treat type 2 diabetes, and improve liver health.
研究领域:
药理学
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分子生物学
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代谢病研究
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产品关联
DOI
PubMed
高影响因子
ADVANCED SYNTHESIS & CATALYSIS
·
2021
·Vol. 363
·期 6
·1672-1684
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IF 5.837
Zhipeng Liu,Xinwei Hu,Can Yang,Haisheng Xie,Huanfeng Jiang,Wei Zeng
Graphical A Rh(III)-catalyzed C sp 2 −C sp 3 bond cleavage/carbonylethylation of α-indolyl alcohols with allylic alcohols has been reported. This transformation involved a cascade C−C bond cleavage/C−C bond formation, and provides a novel approach to assemble 2-carbonylethylindole skeletons.
研究领域:
有机化学
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催化反应
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2022
·
IF 4.865
Jiajia Cai,Lingna Kong,Xiangxuan Tang,Jianmin Wang,Zhihong Xie,Xianxuan Wang,Qian Xie,Qiyan Xu
Hematite (α-Fe 2 O 3 ) is one of the most promising candidates as a photoanode for photocathodic protection (PCP) of 304SS. However, serious charge recombination has hindered the application. In this work, we verified the feasibility of constructing heterojunction for enhancing the PCP performance. α-Fe 2 O 3 @Bi 2 S 3 can not only broaden the solar light absorption region but also provide a built-in electric field to improve charge separation and close junctions for charge transport. When α-Fe 2 O 3 @Bi 2 S 3 was coupled with 304SS, the OCP under illumination negatively shifted to −0.788 V Ag/AgCl , which was ca . 600 mV negative than the corrosion potential of 304SS. The photoinduced current density reached 32 μA cm −2 , outperforming the bare Bi 2 S 3 and α-Fe 2 O 3 . The formation of a type II heterojunction between Bi 2 S 3 and α-Fe 2 O 3 was proposed and verified by the electrochemical impedance measurements.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Su Q. Dong,Pu K. Mi,Sheng Xu,Jun Zhang,Rui D. Zhao
In this paper, a single-component poly-α-olefin (PAO) oil base stock of an α-olefin tetramer was prepared via two-step oligomerization using a metallocene catalyst and a Ziegler–Natta catalyst in sequence. The structure was characterized, the performance was investigated, and the effects of the molecular structure and composition on performance were evaluated. First, the α-olefins were dimerized with different metallocenes as the catalyst, and the effects of the oligomerization conditions (amount of catalyst, temperature, and ratio of Al/Zr) on the molecular weight distribution of the obtained polymers were investigated. The dimerization selectivity reached 83.1%, and the content of branched α-olefin was 91.7%. In the second step, the obtained α-olefin dimer was polymerized by a Ziegler–Natta catalyst, and the dimerization reaction was dominant. A PAO with a tetramer content of 89.6% was obtained, and at 100 °C, the kinematic viscosity was 6.4 cSt and the viscosity index was 148. Further results suggested that both molecular structure parameters (the length of the main chain and the length of the branches) affect the PAO properties when the number of branches and the branch position on the molecular skeleton are the same. It was also found that, as the length of the main chain and the length of the branches increased, the kinematic viscosity and viscosity index increased, while the pour point decreased; however, when the length of the main chain, the number of branches, and the length of the branches were the same, the presence of quaternary carbons in the main chain lowered the viscosity index and increased the pour point.
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
Coatings
·
2024
·Vol. 14
·期 2
·227
·
IF 2.9
Renjie Wang,Shanshan Liu,Xudong Song,Kai Jiang,Yaohui Hou,Qiaohuan Cheng,Wei Miao,Li Tian,Ying Ren,Sankui Xu
Uric acid, a metabolite formed by the oxidation of purines in the human body, plays a crucial role in disease development when its metabolism is altered. Various techniques have been employed for uric acid analysis, with electrochemical sensing emerging as a sensitive, selective, affordable, rapid, and simple approach. In this study, we developed a polymer-based sensor (PPy/α-Fe2O3) for the accurate determination of uric acid levels. The PPy/α-Fe2O3hybrids were synthesized using an uncomplicated in situ growth technique. Characterization of the samples was performed using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The electrochemical sensing performance towards uric acid was evaluated through cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The obtained results demonstrated that the sensor exhibited excellent sensitivity towards uric acid detection within a wide range of 5–200 μM with a limit of detection (LOD) as low as 1.349 μM. Furthermore, this work elucidated the underlying sensing mechanism and highlighted the pivotal role played by PPy/α-Fe2O3hybrids in enabling efficient uric acid sensing applications using electrochemical sensors.Keywords:polypyrole;α-Fe2O3;uric acid;electrochemical sensor;differential pulse voltammetry
研究领域:
电化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Tong Liu,Yu Liu,Yuwei Ye,Jingyu Li,Feng Yang,Haichao Zhao,Liping Wang
In this study, a self-healing epoxy coating containing tetraaniline modified α-Fe 2 O 3 (TAFe) was prepared for corrosion protection of Q235 steel. The TAFe particles were synthesized using bio-inspired catechol chemistry and the evaluation of the corrosion resistant benefits of TAFe as additive in the epoxy coating were conducted. The time-dependent corrosion protective ability of the epoxy composite coating containing TAFe applied on Q235 carbon steel were characterized by electrochemical techniques such as EIS and LEIM. Characterization of corrosion layer was done by SEM and XRD after removing coatings after 70 days of immersion in 3.5 wt% NaCl solution. Findings of corrosion measurements confirmed the existence of a small amount TAFe (0.7 wt%) resulted in improvement of corrosion protective properties of steel during corrosion process compared with neat epoxy coating and the coating with 0.7 wt% non-modified Fe 2 O 3 . Moreover, surface techniques showed compact passivated iron oxide layer beneath the coatings and presence of different metallic oxide phases for coatings. The corrosion protective enhancement of composite coating could be ascribed to electroactive function of tetraaniline layer on α-Fe 2 O 3 .
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）