Chinese Journal of Natural Medicines
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2017
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IF 1.667
Xiao-Xiao LU,Yi-Fan JIANG,Hong LI,Ying-Ye OU,Zhi-De ZHANG,Hong-Ye DI,Dao-Feng CHEN,Yun-Yi ZHANG
Lipopolysaccharides (LPS) contamination in herbal crude polysaccharides is inevitable. The present study was performed to explore the effect of polymyxin B on abolishing the influence of LPS contamination in mononuclear cells. LPS was pretreated with polymyxin B sulfate (PB) at different concentrations for 1, 5 or 24 h, and then used to stimulate RAW264.7 and mouse peritoneal macrophages (MPMs). The nitric oxide (NO) and tumor necrosis factor-α (TNF-α) in cell culture supernatant, as the indications of cell response, were assayed. Bupleurum chinensis polysaccharides (BCPs) with trace amount contamination of LPS was treated with PB. 30 μg·mL −1 of PB, treating LPS (10 and 1 000 ng·mL −1 in stimulating RAW264.7 and MPMs respectively) at 37 °C for 24 h, successfully abolished the stimulating effect of LPS on the cells. When the cells were stimulated with LPS, BCPs further promoted NO production. However, pretreated with PB, BCPs showed a suppression of NO production in MPMs and no change in RAW264.7. In the in vitro experiments, LPS contamination in polysaccharide might bring a great interference in assessing the activity of drug. Pretreatment with PB (30 μg·mL −1 ) at 37 °C for 24 h was sufficient to abolish the effects of LPS contamination (10 and 1 000 ng·mL −1 ).
研究领域:
免疫学
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药理学
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DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2019
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IF 4.029
Limeng Liu,Jozef Vleugels,Shuigen Huang,Jie Wei,Yujin Wang
TaC ceramics with 0-0.237 wt% B addition were prepared by hot pressing. The effect of B addition on the phase constitution, interfacial chemistry/bonding and mechanical properties of the TaC ceramics were investigated. Upon B addition, the elimination of O impurity and segregation of B at grain boundaries were evidenced, accompanied by an increase in bonding strength of the TaC grains, to result in a fracture mode change from intergranular to transgranular and a reduced fracture toughness. Addition of excessive B resulted in the formation of TaB 2 and C within TaC ceramics. Further, TaC-TaB 2 -SiC composites were prepared by Si addition. Coherent bonding between TaB 2 and TaC was preserved in the TaC-TaB 2 -SiC composites, and residual stresses due to thermal expansion mismatch of the different phases increased flexural strength and fracture toughness of the composites.
研究领域:
材料科学
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工程学
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2019
·Vol. 29
·期 5
·1221-1226
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IF 1.913
Yan Liqiang,Xie Ya,Li Jianping
Development of optical probe for the detections of Fe 3+ and Cu 2+ is one of the most active and interesting research directions in analytical chemistry because of their vital roles in the environment protection and human health. Herein, a turn on optical rhodamine B-based probe (probe 1) with the significant changes in color and fluorescence has been prepared. The color of this probe solution changed from colorless to amaranth in the presence of Fe 3+ and to pink in the presence of Cu 2+ , which is promising for the qualitative recognition of Fe 3+ and Cu 2+ . More importantly, probe 1 could be used for the quantitative analysis of Fe 3+ and Cu 2+ by fluorescence enhancement. The detection limits for Fe 3+ and Cu 2+ reached 8.1 × 10 −8 M and 4.8 × 10 −7 M, respectively. Furthermore, it was found that this probe can also be used for fluorescence imaging of Fe 3+ and Cu 2+ in living cells.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
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IF 8.758
Yuehan Cao,Ruiyang Zhang,Tianli Zhou,Shengming Jin,Jindi Huang,Liqun Ye,Zeai Huang,Fang Wang,Ying Zhou
Limited by the chemical inertness of CO2 and the high dissociation energy of the C═O bond, photocatalytic CO2 conversion is highly challenging. Herein, we prepare ultrathin oxygen-modified h-BN (O/BN) nanosheets containing B–O bonds. On the O/BN surface, CO2 can be chemically captured and is bonded with the B–O bond, leading to the formation of an O–B–O bond. This new chemical bond acting as an electron-delivery channel strengthens the interaction between CO2 and the surface. Thus, the reactants can continuously obtain electrons from the surface through this channel. Therefore, the majority of gaseous CO2 directly converts into carbon active species that are detected by in situ DRIFTS over O/BN. Moreover, the activated energies of CO2 conversion are significantly reduced with the introduction of the B–O bond evidenced by DFT calculations. As a result, O/BN nanosheets present an enhanced photocatalytic CO2 conversion performance with the H2 and CO generation rates of 3.3 and 12.5 μmol g–1 h–1, respectively. This work could help in realizing the effects of nonmetal chemical bonds in the CO2 photoreduction reaction for designing efficient photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
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IF 4.9
Xuesong Peng,Lanchen Li,Jie Jiang,Yaqiang Li,Xin Li,Guangzhao Wang,Anmin Liu,Meijuan Zhang,Ruopeng Li,Maozhong An
This study explores the impact of the electroplating additive JGB the surface characteristics and peel strength of electrolytic copper foils used in printed circuit boards . Utilizing Scanning Electron Microscopy and Atomic Force Microscopy , we found that optimal JGB concentrations enhance the morphology and roughness of the copper foil roughening layer while maintaining high peel strength. The ideal concentration of 3 mg/L achieved an average roughness of 0.953 µm and a peel strength of 0.946 N/mm. JGB's effectiveness in inhibiting copper deposition was confirmed through cyclic voltammetry , linear sweep voltammetry, and electrochemical impedance spectroscopy . Density Functional Theory calculations and in situ infrared spectroscopy elucidated JGB's adsorption and coordination actions, which have a synergistic effect on its inhibitory performance. Further investigations with molecular dynamics simulations and finite element analysis demonstrated JGB's preferential adsorption in areas of high electric field intensity, effectively controlling the copper grain morphology in the roughening layer. This research highlights the potential of dye-type additives in improving copper foil roughening for printed circuit boards applications. Future research should explore the long-term stability and environmental impact of JGB in industrial applications, while investigating other dye-type additives may further optimize the roughening process to meet diverse printed circuit boards manufacturing needs.
研究领域:
材料科学
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电化学
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表面工程
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
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2025
·Vol. 236
·期 3
·1-14
·
IF 3
Li Yunfei,Liu Zhichang,Ren Hongwei,Chen Chunmao
The dyeing industry wastewater has greatly hampered the ecological environment. The carbon quantum dots (CQDs) is a promising catalyst for photocatalytic degradation. To control the specified structure of CQDs, a designable-green deep eutectic solvents (DESs) was targeted as the precursor. In this work, a copper-doped solid-state Cu-CQDs was successfully prepared by combustion method from glycerol/choline chloride/CuCl 2 ·2H 2 O DESs, and characterized by Fourier transform infrared spectroscopy, XRD, XPS, UV–Vis spectroscopy, and fluorescence spectroscopy. The analysis revealed that the metallic copper-doped Cu-CQDs have better morphological and structural properties and exhibit good optics characteristics. The prepared CQDs were applied to the photocatalytic degradation of Rhodamine-B (RhB). It was found that the ⋅O 2 − was the main active specie, and it can efficient degrade RhB up to 95%. Graphical abstract
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jing Wang,Xiaowei Mei,Fan Zhang,Yongsheng Liu,Dong Wang,Jingxin Li,Ning Dong
This study systematically investigates the influence of preparation temperature on microstructure and generation mechanism of Si–Y–B-Yb ceramics as anti-corrosion matrix. Main phases of Si–Y–B-Yb ceramics are Y/YbB 4 , YSi 2 , and Si, where Y/YbB 4 is derived from the reaction between YSi 2 and YbB 6 . With increase in preparation temperature, open porosity of Si–Y–B-Yb ceramics gradually decreases, reaching 0.24 % at 1350 °C, and internal phases transform from a dispersed distribution to clearly defined boundary state. Based on this, high-temperature water-oxygen corrosion behavior of Si–Y–B-Yb ceramics is characterized in 50 vol% H 2 O+50 vol% O 2 environment at 1250 °C for 100 h. In this corrosive environment, silicate phase appears on the surface of Si–Y–B-Yb ceramics. With prolonged corrosion time, silicate phase gradually forms more complete protective layer, hindering further corrosion by water-oxygen environment. These results demonstrate the feasibility of proposed Si–Y–B-Yb materials for corrosion protection.
研究领域:
材料科学
·
腐蚀与防护
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DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 12
·4965-4970
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IF 1.821
Yinhui Yi,Heng Sun,Gangbing Zhu,Zhen Zhang,Xiangyang Wu
Due to being harmful to the human health, the qualitative and quantitative determination of rhodamine B (RhB) is of great significance. In this paper, per-6-thio-β-cyclodextrin functionalized nanogold/hollow carbon nanospheres (β-CD-AuNPs/HCNS) nanohybrids were prepared and then applied successfully for the highly sensitive electrochemical detection of RhB. Due to the synergetic effects from the HCNS (excellent electrochemical properties and large surface area), β-CD (high host–guest recognition and water-solubility) and AuNPs (excellent electrocatalytic activity), the oxidation peak currents of RhB on the β-CD-AuNPs/HCNS modified glassy carbon electrode (GCE) are much higher than those on the AuNPs/HCNS/GCE and bare GCE. The β-CD-AuNPs/HCNS/GCE has a linear response range of 4.79–958.00 μg L−1 with a detection limit of 0.96 μg L−1 for RhB.
研究领域:
分析化学
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食品安全
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
·
IF 4.969
Yan Wang,Kangkang Miao,Weixing Zhao,Hongbo Jiang,Liangliang Liu,Dengwei Hu,Bin Cui,Yaping Li,Yue Sun
In this study, nanoparticle-assembled Bi 25 FeO 40 materials were synthesized by a novel and simple process, and their microstructure was regulated by different methods of adding Bi 3+ and Fe 3+ . The novel nanoparticle-assembled tetrakaidekahedron Bi 25 FeO 40 materials exhibited more oxygen vacancy and larger specific surface area than irregular or cubic-like Bi 25 FeO 40 microcrystals and revealed better photo-Fenton catalytic oxidation activity toward degrading Rhodamine B (RhB) pollutants. These novel materials activated H 2 O 2 in visible light to produce non-free radicals 1 O 2 and hole (h + ) active oxidative species that dominated the catalytic degradation of RhB. Complete degradation of RhB was achieved after 1 h. The possible reaction mechanisms of the photo-Fenton catalytic system are discussed in detail by radical scavenging tests, X-ray phosphorescence analysis, and electron paramagnetic resonance spectroscopy . The results provided a way to rationally explore and construct photo-Fenton catalysts for wastewater treatment .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Fanghui Cai,Chunyu Sun,Zhenzhen Sun,Yong Lai,Hanming Ding
Spinel-type bimetallic oxides have several potential applications in the catalytic degradation of organic wastewater due to their high catalytic activity and slow ion release rate caused by bimetallic synergy. In this study, sulfur-functionalized CoMn 2 O 4 (S-CoMn 2 O 4 ) was prepared as a Fenton-like catalyst by the sol–gel process, followed by calcination and sulfurization. The catalytic activity of CoMn 2 O 4 was significantly increased by the incorporation of sulfur. The S-CoMn 2 O 4 (5.00%) catalyst modified with 5.00% sulfur in atomic percentage exhibited the best catalytic performance. Typically, 30 mg/L of rhodamine B was removed in 18 min by using 0.20 g/L S-CoMn 2 O 4 (5.00%) and 0.16 g/L peroxymonosulfate. Singlet oxygen and sulfate radicals are the primary active species, according to the trapping agent experiments and EPR measurements. The incorporation of sulfur leads to the formation of abundant oxygen vacancies in CoMn 2 O 4 and sulfate groups bound on the surface of CoMn 2 O 4 , which promotes producing more active species. A synergism of Co and Mn ions in CoMn 2 O 4 and high electron transfer mobility are also responsible for the enhanced degradation performance of S-CoMn 2 O 4 (5.00%). This study provides a feasible solution for improving cobalt manganese oxide as a more effective and long-lasting Fenton-like catalyst for the degradation of organic contaminants.
研究领域:
环境科学
·
催化材料
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DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2023
·Vol. 122
·期 18
·
IF 4
Xu Baoyin,Du Haozhe,Yang Bin,Ding Zhanhui,Wang Xiancheng,Wang Yanchao,Li Ziheng,Li Yongfeng,Yao Bin,Ma Hong-An,Lan Yucheng
The exploration of novel ultrawide bandgap (UWBG) semiconductors is becoming a challenging and compelling research focus on semiconductor physics, materials, and device applications. Ternary B–C–N compounds have attracted much attention because their electronic structure and semiconductor properties are quite different depending on the chemical composition and atomic arrangement of boron, carbon, and nitrogen elements in the lattice. However, the lack of well-controlled high-quality B–C–N crystals has limited their potential as UWBG devices. In this study, B–C–N compounds are synthesized in bulks from graphite and hexagonal boron nitride ( h -BN) using ball milling and high-pressure high temperature technique. The synthesized B–C–N compounds produced are highly crystallized layered-materials with intercalated graphene layers in C-doped h -BN layers. The doped carbon atoms occupy boron sites and nitrogen sites of the h -BN layers unbalanced, giving rise to the n -type conductivity of the B-C-N layered compounds. The measured optical bandgaps range from 3.4 to 6.0 eV, which can be regulated by the carbon content. Their electronic properties are also tunable. Our work is expected to initiate potential applications of the B–C–N material as UWBG semiconductors.
研究领域:
材料科学
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半导体物理
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产品关联
DOI
高影响因子
Forests
·
2023
·Vol. 14
·期 5
·965
·
IF 2.9
Gaojun Chen,Yudong Li,Enshan Han,Ziqiang Zhang,Xiaohui Yang,Desheng Zhou,Yanzhen He
The optimization of supercapacitive properties in carbon materials derived from cheap and sustainable wood scraps exhibits great application potential. Herein, in support of interfacial groups, polyaniline nanospheres were in situ constructed in the internal pore structure of wood scraps; further, the B and N elements were imported by carbonized and hydrothermal methods. The doped B regulated the species of N doping to improve the electrical conductivity of carbonized wood scraps, and it endowed a certain pseudo-capacitance. Coupled with the fine double-layer capacitance from the hierarchical structures constructed by carbonized nanospheres and wood scrap channels, a high specific capacitance of 406 F g−1at 0.5 A g−1, high energy density (17.71 Wh kg−1at 250 W kg−1) and cycle stability (93.04% capacitance retention after 10,000 cycles) were performed simultaneously. This study provided a new strategy to improve the supercapacitive performance of bio-carbon materials in terms of structure and conductance.Keywords:wood scrap;B/N co-doping;porous carbon;in situ synthesis;supercapacitor
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）