APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Yuewen Lu,Jin Chen,Ruihao Wang,Pengfei Xu,Xingquan Zhang,Bing Gao,Changping Guo,Guangcheng Yang
Simultaneous improvement of the safety performance and thermal decomposition properties of ammonium perchlorate (AP) remains a significant challenge. Therefore, based on inspiration from biological materials, we have prepared a novel copper alginate/ammonium perchlorate (Cu-alginate/AP) composite by facile air atomization. The evaluation of the safety performance and thermal decomposition indicates that these properties were significantly improved. In addition, the possible catalytic mechanism of thermal decomposition of AP is proposed herein. It should be noted that Cu-alginate is a three-dimensional network structure and was uniformly coated on the surface and inside of the AP. When the composite is stimulated by external forces, this unique structure plays a buffering role, absorbing energy and greatly improving safety performance. With increasing temperature, the Cu-alginate easily decomposed and renascent Cu-based nanoparticles were generated by in situ growth. These renascent nanoparticles exhibited excellent catalytic activity for the thermal decomposition of AP. As expected, the bio-inspired material can smartly improve both the safety performance and thermal decomposition of AP. Therefore, these findings provide a promising strategy for the development of composite solid propellants.
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高影响因子
Materials Research Express
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2018
·Vol. 5
·期 7
·075030
·
IF 1.151
Jian Feng,Xiaosheng Yang,Guangwei Feng,Hong Xu
In this study, the different compositions of Zn–Cu–In–S quantum dots (ZCIS QDs) were prepared by a facile synthetic approach. The compositions and particle sizes of ZCIS nanocrystals were precisely controlled. The composition-dependent molar extinction coefficient of nonstoichiometric ZCIS QDs has been determined by combination of ICP-MS with UV–vis absorption and TEM. The molar extinction coefficient values were found to comply with a power function with exponents of 3.6 and 1.8 with the variation of the content of Cu or Zn, respectively. The extinction coefficient of ZCIS QDs exhibited the composition dependency and seemed to be larger than that of CuInS2 for a given size. The determination of the extinction coefficient makes it feasible to calculate the concentration of ZCIS QDs in solution and promotes its further applications in bioanalysis.
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JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Yiping Tang,Kang Shen,Ziye Lv,Xin Xu,Guangya Hou,Huazhen Cao,Liankui Wu,Guoqu Zheng,Yida Deng
Lithium metal anode is regarded as the "holy grail" due to its extremely high specific capacity, low density and low reduction potential. However, Li dendrite growth reduces coulombic efficiency and causes safety accidents synchronously. In this paper, a rational designed three-dimensional ordered macroporous Cu is used as current collector for Li metal anode with excellent electrochemical performance, which is prepared by colloidal template method combined with copper electrodeposition . The novel porous Cu/Li anode with the pore size of 450 nm can stably run for 750 h at 0.2 mA/cm 2 with a small Li electroplating/stripping overpotential (<30 mV), and it exhibits a high coulombic efficiency of 93.3% over 120 cycles. The three-dimensional ordered macroporous structure with large specific surface area results in lower local current density and enhances electrochemical reaction kinetics, and benefits Li deposition inside pores. Especially, the Li layer on the arc area of outer pores acts as seed crystal for the subsequent Li deposition, which leads to Li uniform nucleation and dendrite suppression effectively.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Yunfei Sun,Min Ma,Bo Tang,Sen Li,Li Jiang,Xiaohong Sun,Miaoling Que,Chongben Tao,Zhengtian Wu
The copper-benzene-1,3,5-tricarboxylate (Cu-BTC) attracts increasing attention because of its large BET surface area available for the adsorption of gases. However, low stability in water creates a barrier for its potential applications. In this study, graphene oxide (GO) and reduced graphene oxide (RGO) are adopted to modify the Cu-BTC. The influence of GO and RGO on the resulting BET surface area, pore diameter distribution, morphology and yield of the Cu-BTC are revealed. It is found that the adsorption abilities of the resulting composites for the polar and nonpolar gas molecules are closely related to the presence at surface of the functional groups of the used graphene samples, which provides a potential method to achieve selective adsorption. Furthermore, the preparation processes of the GO/Cu-BTC and RGO/Cu-BTC exert a significant effect on the performances of the resulting product, which is also studied in detail.
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RSC Advances
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2014
·Vol. 4
·期 95
·52836-52844
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IF 3.708
Li Zhao,Le Xin Song,Juan Xia,Yue Teng,Zheng Kun Yang,Qing Shan Wang
A simple, but efficient, method for the preparation of a series of Cu-based nanomaterials including Cu, CuCl, CuO, Cu@CuCl and CuCl@CuO was developed. Initially, we prepared a novel precursor consisting of a Cu(II)–urea complex (CUC, a coordination compound) and polytetrafluoroethylene (PTFE, a water-insoluble polymer) using the technique of solid–solid grinding. Subsequently, the Cu-based materials were synthesized by sintering the precursor at different atmospheres and temperatures. This approach provides an environmentally friendly and green alternative towards creating Cu-based materials by generating complex–polymer binary systems without the use of solvents. Our results indicated that the effect of PTFE played a crucial role in the formation of the materials. Further, the role of PTFE was found to be associated with sintering atmospheres: the reduction of CuCl to Cu in nitrogen was delayed; contrarily its oxidation to CuO in air was advanced. The nature of this role was ascribed to an ion–dipole interaction between the partial negative charges on the fluorine atoms (Fδ−) on the PTFE chains and the Cu(II) ions in the coordination centers [Cu(II)–urea] induced by a solid–solid mixing process, leading to the CUC complex decomposing later in nitrogen and earlier in air. Also, the presence of CUC drastically affects the thermal pyrolysis pattern of PTFE, resulting in a remarkable decrease, and even disappearance of the etching signals of PTFE. Finally, our data suggested that the as-prepared Cu@CuCl nanomaterial induced a strong surface-enhanced Raman scattering effect for several model compounds, including rhodamine 6G and crystal violet. We believe that this study represents a significant step towards the development of practical synthesis of Cu-based nanomaterials and opens up exciting opportunities for the design and construction of a wide range of transition metal-based nanomaterials through the link between polymers and coordination compounds.
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Environmental Science-Processes & Impacts
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2013
·Vol. 16
·期 3
·524-533
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IF 0
Shaolin Li,Wei Wang,Weile Yan,Wei-xian Zhang
A field demonstration was conducted to assess the feasibility of nanoscale zero-valent iron (nZVI) for the treatment of wastewater containing high levels of Cu(II). Pilot tests were performed at a printed-circuit-board manufacturing plant, treating 250 000 L of wastewater containing 70 mg L−1 Cu(II) with a total of 55 kg of nZVI. A completely mixed reactor of 1,600 L was operated continuously with flow rates ranging from 1000 to 2500 L h−1. The average Cu(II) removal efficiency was greater than 96% with 0.20 g L−1 nZVI and a hydraulic retention time of 100 min. The nZVI reactor achieved a remarkably high volumetric loading rate of 1876 g Cu per m3 per day for Cu(II) removal, surpassing the loading rates of conventional technologies by more than one order of magnitude. The average removal capacity of nZVI for Cu(II) was 0.343 g Cu per gram of Fe. The Cu(II) removal efficiency can be reliably regulated by the solution Eh, which in turn is a function of nZVI input and hydraulic retention time. The ease of separation and recycling of nZVI contribute to process up-scalability and cost effectiveness. Cu(II) was reduced to metallic copper and cuprite (Cu2O). The end product is a valuable composite of iron and copper (∼20–25%), which can partially offset the treatment costs.
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PubMed
JOURNAL OF ALLOYS AND COMPOUNDS
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2015
·
IF 2.999
Huali Hao,Wei Mo,Yonghu Lv,Shulong Ye,Ruinan Gu,Peng Yu
The influence of trace elements on the powder metallurgy of Cu was investigated. It was found that 1 wt. % of Ti can effectively increase the green density of the compacts and facilitate the subsequent sintering process, thus resulting in increased sintered density. Although 1 wt. % of W added into the Cu leads to similar increasing of green density, W significantly retarded the sintering process and has a negative effect on the sintered density. Moreover, intermetallic Cu 4 Ti were formed, which not only creates a short-circuit diffusion path for Cu but also forms liquid phases during sintering. However, it was hardly dissolved between W and Cu.
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BIOSENSORS & BIOELECTRONICS
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2015
·
IF 6.409
Lihua Jin,Zaihua Zhang,Anwen Tang,Cong Li,Yehua Shen
In this work, we have presented a novel strategy to utilize as-synthesized yeast extract-stabilized Cu nanoclusters (Cu NCs) for sensitive and selective detection of S 2− . The fluorescence intensity of Cu NCs was enhanced significantly in the presence of both Na 2 S 2 O 8 and S 2− . By virtue of this specific response, a Cu NC-based fluorescent turn-on sensor was developed, which allows the detection of S 2− in the range of 0.02–0.8 μM with a detection limit of 10 nM. The enhancing mechanism was also discussed based on fluorescence decay , transmission electron microscopy (TEM) and dynamic light scattering (DLS) studies, indicating that S 2− enhanced the Cu NCs emission mainly through sulfide-induced aggregation of Cu NCs. Furthermore, we demonstrated the usability of the present approach for the detection of S 2− in water samples, which illustrates its great potential for the environmental monitoring and water quality inspection fields.
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PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2013
·
IF 2.145
Rui-tang Guo,Wen-long Zhen,Wei-guo Pan,Yue Zhou,Jie-nan Hong,Hong-jian Xu,Qiang Jin,Cheng-gang Ding,Shi-yi Guo
CeO 2 –CuO catalyst prepared by citric acid method was investigated for selective catalytic reduction of NO with NH 3 . The activity of the CeO 2 catalyst was enhanced about 8–27% in the temperature range of 125–225 °C at a space velocity of 28,000 h −1 by the addition of Cu. It was found that the state of Cu species had great impact on the SCR performance of CeO 2 –CuO catalyst. Cu 2+ can enhance the low temperature activity of SCR reaction, while CuO would promote NH 3 oxidation before SCR reaction at high temperature, which would cause the decrease of its high temperature SCR activity.
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TETRAHEDRON
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2013
·
IF 2.803
Run-Lin Li,Gong-Qing Liu,Wei Li,Yu-Mei Wang,Lin Li,Lili Duan,Yue-Ming Li
3-Chloropiperidine compounds were obtained via Cu(II)-promoted one-pot intramolecular chloroamination of N -benzyl-4-penten-1-amines and subsequent rearrangement. The reaction conditions leading to this skeleton were studied, and the structure of the product was confirmed by NMR as well as X-ray diffraction experiments.
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LUMINESCENCE
·
2017
·Vol. 32
·期 6
·1092-1099
·
IF 1.509
Tingting Luo,Shiting Zhang,Yujue Wang,Meina Wang,Mei Liao,Xingming Kou
In this paper, an innovative and facile one-pot method for synthesizing water-soluble and stable fluorescent Cu nanoclusters (CuNCs), in which glutathione (GSH) served as protecting ligand and ascorbic acid (AA) as reducing agent was reported. The resultant CuNCs emitted blue-green fluorescence at 440 nm, with a quantum yield (QD) of about 3.08%. In addition, the prepared CuNCs exhibited excellent properties such as good water solubility, photostability and high stability toward high ionic strength. On the basis of the selective quenching of Hg 2+ on CuNCs fluorescence, which may be the result of Hg 2+ ion-induced aggregation of the CuNCs, the CuNCs was used for the selective and sensitive determination of Hg 2+ in aqueous solution. The proposed analytical strategy permitted detection of Hg 2+ in a linear range of 4 × 10 −8 to 6 × 10 −5 M, with a detection limit of 2.2 × 10 −8 M. Eventually, the practicability of this sensing approach was confirmed by its successful application to assay Hg 2+ in tap water, Lotus lake water and river water samples with the quantitative spike recoveries ranging from 96.9% to 105.4%.
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高影响因子
Nano Energy
·
2017
·
IF 12.343
Wenjun Fan,Zelong Li,Chenghang You,Xu Zong,Xinlong Tian,Shu Miao,Ting Shu,Can Li,Shijun Liao
In this work, CuCl 2 as a promoter was added into the mixture of polythiophene (PTh), FeCl 3 , and melamine for preparing Fe-Cu-N/C catalyst. The catalyst features one-dimensional bamboo-like carbon nanotubes with few metal oxide nanoparticles encapsulated into tubes. The catalyst exhibits excellent activity toward the oxygen reduction reaction (ORR) with half-wave potential 50 mV more positive than the commercial Pt/C in 0.1 M KOH. It also shows comparable ORR activity in 0.1 M HClO 4 solution. Moreover, it exhibits superior long-term stability and excellent methanol tolerance in both alkaline and acidic solutions. The outstanding catalytic performance of Fe-Cu-N/C catalyst can be ascribed to the doping of Cu in the Fe-N-C architecture, which promotes the formation of bamboo-like nanotube structure and the generation of interaction among Cu and Fe-N-C. This synthetic strategy may open new avenues for constructing highly efficient electrocatalysts that adding of an inactive metal can obviously promote the catalytic performance of catalysts.
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