CHEMISTRY-A EUROPEAN JOURNAL
·
2019
·Vol. 25
·期 49
·11486-11493
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IF 5.16
Xinyi Wang,Xijun Xu,Jun Liu,Zhengbo Liu,Jiadong Shen,Fangkun Li,Renzong Hu,Lichun Yang,Liuzhang Ouyang,Min Zhu
Graphical Nanocomposite anodes : Uniform peapod-like Cu 3 Ge/Ge@C composites are fabricated successfully through a facile dopamine-coating and annealing route (see figure). Owing to the homogeneous carbon encapsulation and the addition of the inactive alloying phase Cu 3 Ge, this Ge-based anode exhibits an excellent high specific capacity, outstanding cycle stability, and excellent rate performance for LIBs. As anode materials for high-performance Li-ion batteries, peapod-like Ge-based composites, including Ge, a Li-inactive conducting Cu 3 Ge, and a porous carbon matrix are synthesized simply by annealing CuGeO 3 @dopamine in a H 2 /Ar atmosphere. The introduction of the carbon layer and inactive alloying phase Cu 3 Ge not only enhances the electrical conductivity of the Ge anode, but also reduces the volume change of Ge during the cell cycle as a buffer. In particular, the anode of this peapod-like Cu 3 Ge/Ge@C shows an excellent long cycle life as well as outstanding capacity performance, with a discharge specific capacity up to 934 mA h g −1 after 500 cycles.
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MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
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2019
·Vol. 70
·期 11
·1964-1976
·
IF 1.458
Jin Li,Daquan Zhang,Kai Zhang,Lixin Gao,Cheng Shi,Donghui Chen,Manhong Huang
The triazole inhibitor of 1-(p-tolylthio)-1H-1,2,3-triazole-4-carboxylic acid (TTC) was synthesized via the Cu(I)-catalyzed azide-alkyne 1,3-dipolar cycloaddition reaction. The self-assembling method was performed to fabricate the self-assembled film of TTC on the copper surface. The electrochemical measurement results indicate that the TTC film can efficiently protect the copper from corrosion in high concentrated industrial cooling water. The protection efficiency of TTC film for copper is 92.2%. Surface characterizations imply that the copper with TTC film after corrosion is covered with multiple protective layers. It probably contains Cu(I) and Cu(II) complexes mixed with nitrogenous compound, Cl − and SO 4 2− . The result of quantum chemical calculation shows that the superior performance of TTC film is related to the adsorption of TTC molecules on copper surface horizontally. This kind of adsorption is mainly achieved via the adsorption centers of triazole ring and O atoms in TTC molecule.
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Molecular Medicine Reports
·
2019
·Vol. 20
·期 1
·771-778
·
IF 1.851
Yanyan Wang,Huaqiao Tang,Min Xu,Jie Luo,Ling Zhao,Fei Shi,Gang Ye,Cheng Lv,Yinglun Li
The aim of the present study was to evaluate the long‑term effect of copper nanoparticles (CuNPs) on cytochrome P450 (CYP450) enzymes in the rat brain. Rats were repeatedly gavaged with different forms of copper sources for 28 days, and the levels of oxidative stress and CYP450 mRNA and protein expression in the rat brain were subsequently analyzed. The results demonstrated that a high dose of CuNPs (200 mg/kg) induced severe oxidative stress in the rat brain along with a decrease in the levels of total superoxide dismutase and glutathione, and an increase in hydroxyl radicals and malondialdehyde. A medium dose of CuNPs reduced CYP450 2C11 and CYP450 3A1 protein expression in the rat brain, whereas high doses of CuNPs resulted in decreased expression of most CYP450 enzyme proteins, and inhibition of pregnane X receptor and constitutive androstane receptor expression. The results suggested that CuNPs may inhibit CYP450 enzyme expression by increasing the levels of oxidative stress and decreasing the expression of nuclear receptors in the rat brain, which affects the metabolism of drugs and endogenous hormones in the brain.
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Analytical Methods
·
2019
·Vol. 11
·期 34
·4382-4389
·
IF 2.378
Fanglin Ming,Jingzhou Hou,Danqun Huo,Jun Zhou,Mei Yang,Caihong Shen,Suyi Zhang,Changjun Hou
A luminescent amino-functionalized metal–organic framework (Cu–MOFs) was synthesized from 2-aminoterephthalic acid and Cu(II) ions by a solvothermal method. Cu–MOFs displayed blue fluorescence with a peak at 430 nm under 330 nm excitation. Its structure was characterized by FTIR, TEM, XRD, and XPS. The fluorescence of the Cu–MOFs was quenched by Fe3+ in aqueous solutions. The limit of detection was 0.5 μM, and the linear working range extended from 2 μM to 35 μM. Additionally, a good logarithmic relationship between relative fluorescence intensity (F/F0) and Fe3+ concentrations ranging from 2 to 180 μM was obtained with a detection limit of 1.56 μM (R2 = 0.9975). No clear interference was observed when challenged with a wide variety of cations and anions. The recoveries from spiked real water samples were in the range of 91.7–107.7%, and the detection results were consistent with inductively coupled plasma mass spectrometry (ICP-MS) results. Therefore, the fluorescent sensor has great potential in environmental monitoring.
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CHEMOSPHERE
·
2019
·
IF 5.108
Huizhong Chi,Zeyu Wang,Xu He,Jianqiao Zhang,Da Wang,Jun Ma
Organic degradation by zero-valent metal (ZVM)-activated peroxymonosulfate (PMS) systems has drawn great attention in water treatment . Among various types of ZVM, zero-valent copper (ZVC) showed greatest activating capacity. However, the disadvantages of the released Cu 2+ limit the practical utilization of ZVC. In this study, the activation capacity of four normal-sized copper catalysts, namely, copper sheet, graphene-copper sheet, copper foam, and graphene-copper foam, for PMS was investigated using Naproxen (NPX) as the probe compound. Results showed that the degradation efficiency of NPX increased by 10%, while the release of Cu 2+ decreased by 30% by coating the copper with graphene. Stability tests showed that all of the four catalysts exhibited considerable stability in PMS activation . Furthermore, we found for the first time that the hydroxyl radical was the dominant species in the degradation of NPX rather than the sulfate radical, which was proved by ESR and radical scavenging experiments. Finally, six intermediates were identified by HPLC-MS/MS, and the degradation pathways were proposed. This study confirmed the feasibility of graphene coating on metals to achieve the enhancement of PMS activation.
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Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-13
·
IF 12.264
Pan Zhengbin,Han Ershuan,Zheng Jingui,Lu Jing,Wang Xiaolin,Yin Yanbin,Waterhouse Geoffrey I. N.,Wang Xiuguo,Li Peiqiang
Flower-like CeO 2 nanoparticles enhance the performance of CuO nanoparticle/Cu.
The system benefits from the heterojunction between p-type CuO and n-type CeO 2 .
The selective reduction of CO 2 to methanol on the target catalyst is studied.
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ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Chenhuinan Wei,Xiao Zou,Qiming Liu,Shuxian Li,Chenxia Kang,Wei Xiang
CuS nanosheets modified Cu 2 O/CuO nanowire arrays (NWAs) were successfully fabricated on Cu foil by in-situ growth and successive ionic layer adsorption and reaction (SILAR) methods without binders. The three-dimensional Cu 2 O/CuO NWAs not only showed strong binding force with current collector but also provided abundant surface area to support CuS nanosheets. Different morphologies of CuS were obtained by varying the Cu(NO 3 ) 2 and Na 2 S concentrations and the SILAR cycle. When these step-wise prepared products were employed for non-enzymatic glucose sensing, the amperometric response of the optimized CuS/Cu 2 O/CuO/Cu electrode was approximately twice of that of Cu 2 O/CuO/Cu electrode. The result is attributed to the modification of CuS nanosheets with suitable amount which increases the active surface area of the electrode. This designed electrode presents an ultrahigh sensitivity of 4262 μA mM −1 cm −2 in the range from 0.002 to 4.096 mM, as well as the excellent selectivity, reproducibility and stability. Moreover, due to the facile preparation and the low cost of Cu based sensors, the CuS/Cu 2 O/CuO/Cu electrode will be one kind of promising materials for constructing practical non-enzymatic glucose sensors.
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Food Packaging and Shelf Life
·
2019
·
IF 3.63
Zi-Wei Jiang,Wen-Wen Yu,Yan Li,Lei Zhu,Chang-Ying Hu
Nanocopper with different concentrations was introduced to homopolymer polypropylene (PP-H) matrix to prepare nanocopper/PP-H composite film. Film appearance, mechanical and thermal properties were investigated. Migration test to 3% acetic acid (w/v) food simulant, film antibacterial ability and human hepatotoxicity were conducted to further evaluate film safeness. FTIR results suggest that nanocopper particles were physically dispersed in PP-H matrix and the addition of nanocopper could significantly improve thermal and mechanical properties of composite films, ensuring its potential utilization for food packaging. Also, the composite film showed great antibacterial ability including Escherichia coli , Staphylococcus aureus , Shigella castellani and Bacillus subtilis . At 70 ℃, when the initial concentration of added nanocopper reached 1% (w/w) or higher, the concentration of copper migrated from film to acetic food simulant would reach to 4.5 μg/g and would start damaging L-02 cells. This study provides important information for the potential utilization of nanocopper in food packaging films.
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BIOMACROMOLECULES
·
2019
·
IF 5.667
Yangyang Yan,Chen Gao,Jianjun Li,Tao Zhang,Guang Yang,Zhongkai Wang,Zan Hua
Herein we report the synthesis of a cellulose-grafted bottlebrush copolymer with nucleobases as hydrophobic moieties. Well-defined spherical micelles from this bottlebrush copolymer were fabricated via a solvent switch method. A morphological transition from spheres to worms was only observed to occur when a diblock copolymer with a complementary nucleobase functionality was introduced. Hydrophobic interaction is not capable of triggering the morphological transformation, and the diblock copolymer with the heterogeneous acrylamide nucleobase monomer can induce the morphological transition at higher A:T molar ratios, which might be caused by the weak H-bonding interaction. This supramolecular “grafting to” method enables the preparation of a series of nanoparticles with similar shapes and dimensions but distinct surface properties such as zeta potentials. Moreover, reversible morphological transitions between worm-like micelles and spheres can be achieved using a reversible collapsing and swelling of a thermoresponsive polymer. This work highlights that a supramolecular “grafting to” approach between complementary nucleobases can be utilized to tune morphologies and surface properties of nanoparticles.
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Environmental Chemistry Letters
·
2019
·Vol. 18
·期 1
·237-241
·
IF 4.617
Zhao Xiaodan,Wu Ying,Xing Danying,Ren Zhaojin,Ye Lingfeng
Sulfate radicals (SO 4 ·− ) are highly efficient for the degradation organic pollutants. SO 4 ·− can be produced by activation of sulfites, yet actual heterogeneous activators exhibit a lower reactivity for activation of sulfite to SO 4 ·− at pH 7.0–8.0. Here we hypothesized that zero-valent copper can activate sulfite under mild conditions. We tested the reaction with iohexol, diatrizoate, atrazine, benzoic acid, and p -chlorobenzoic acid contaminants. Reactive radicals were identified by electron paramagnetic resonance, fluorescence spectrometry, and radical scavenging experiments. Results show up to 90% abatement of contaminants by combining sulfite with zero-valent copper at pH 8.0. Moreover, zero-valent copper maintains a crystalline stability and satisfactory reusability with iohexol abatement efficiency up to 80% after five runs.
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CHEMOSPHERE
·
2019
·
IF 5.108
Liheng Liu,Dongwei He,Fei Pan,Rong Huang,Hua Lin,Xuehong Zhang
In this study, Fe/Cu, Fe/Al/Cu, Fe/Cu/C and Fe/Al/Cu/C internal electrolysis systems (IESs) were constructed and used to treat methylene blue dye (MB) wastewater. The effects of filler mass ratio, filler dosage, solution pH, reaction time and reaction temperature on COD removal were discussed, while the kinetics, thermodynamics and mechanism of COD removal were also investigated. The results showed that when the COD removal rates were basically the same, the reaction times of Fe/Al/Cu, Fe/Cu/C and Fe/Al/Cu/C IESs were shorter, and the filler dosages were lower. For the four systems, the appropriate pH was around 5, while the suitable reaction temperature was in the range of 20–25 °C. The COD removals of these four IESs were generally greater than 90%. The COD removal processes of the four systems could be better described by the improved pseudo-second-kinetic model, and the liquid film diffusion was the rate-controlling step. Moreover, the COD removal was a spontaneous and endothermic process. MB was degraded into inorganic substances in four steps. In addition, the FTIR characterization of the fillers before and after reaction suggests the four IESs have good stability.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 15
·13180-13187
·
IF 2.324
Wang Yan,Wang Yishu,Ma Limin,Han Jing,Guo Fu
Due to the asymmetric structure of Sn unit cell, the electromigration behaviors of Sn based solder joints were significantly depended on the crystal orientation of Sn grain. The present investigation illustrated the effect of Sn grain c -axis on the intermetallic compounds (IMCs) growth under current stressing. The Cu particles reinforced Sn3.5Ag solder joint was selected to obtain various observed surfaces of the sample after 46 days current stressing. The front side, back side, right side and anode side of the sample represented different phenomena, which reflected and proved the importance of c -axis orientation on Cu atomic migration in three-dimension space. Besides, another composite solder joint was polished severe times on the observed surface which was full of IMCs. It showed that the IMCs were covered on the Sn-based solder, and there was crack at the cathode underneath the front surface after 38 days current stressing. The IMC growth behavior would be well understood by systematic study in this work.
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