SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2018
·
IF 5.018
Bin Xu,Jing Zhou,Zhongjin Ni,Caixia Zhang,Congda Lu
In this study, a novel microencapsulated phase change material , paraffin@Cu-Cu 2 O, was prepared by a hydrothermal method . The diameters of the microcapsules were 600–900 nm. The micro morphology, chemical compositions , phase change properties, and thermal stability of the products were characterized. It was calculated that the encapsulation efficiency of the microencapsulated paraffin@Cu-Cu 2 O composite was 62.79%. The melting temperature and freezing temperature of products were close to those of paraffin, but the products had better thermal stability and higher thermal conductivity because of the metal shell materials. Additionally, we compared the paraffin@Cu-Cu 2 O slurry with paraffin emulsion, and we found that the slurry had better light absorbing properties, thermal conductivity , and photo-thermal conversion performance. The developed material is a promising candidate for application in direct absorption solar collector systems.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lele Cui,Zhiwen Li,Qingqing Li,Meifei Chen,Wenheng Jing,Xuehong Gu
The development of transition metal oxide-based integrated carbonaceous materials for use as bifunctional electrodes of high stability and activity in the heterogeneous electro-Fenton (EF) process is supposed to have great potential in environmental governance. Herein, Cu/CuFe 2 O 4 (CCFO) with different Cu 0 ratios were synthesized by a facile one-step solvothermal approach. These materials were subsequently used to fabricate modified graphite felt through the polytetrafluoroethylene (PTFE)-bonding technique. Importantly, with its hydrophobicity PTFE effectively inhibited metal leaching from the thus obtained cathodes and improved the oxygen utilization rate. Cathode performance in EF-based tetracycline (TC) degradation was found to increase with Cu 0 ratio. The observed increase in activity was attributed to Cu 0 enhancing the 2-electron oxygen reduction reaction selectivity (i.e., H 2 O 2 production) and endowing the cathode with abundant electron-rich centers that accelerated active Fe(II) regeneration, causing rapid conversion of H 2 O 2 to hydroxyl radical ( OH). The possible TC mineralization pathway was inferred by liquid chromatography–mass spectrometry (LC–MS) analysis, and a catalytic mechanism of the heterogeneous EF process was proposed. The most effective cathode fabricated displayed high stability even at pH 3 (0.84 ± 0.11 mg/L Fe and 1.35 ± 0.17 mg/L Cu leaching) and exhibited nearly 80% TC removal efficiency after five oxidation cycles, demonstrating its potential use in heterogeneous EF technology for efficient and durable wastewater treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
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IF 2.711
Jiyun Zheng,Guogang Shu,Wei Wang,Qiulin Li,Wei Liu
Surface quality improvement by Cu activation and oxidation roughening process was studied during electroless coating Cu on boron carbide (B 4 C) particles. The surface morphology was characterized by scanning electron microscope (SEM) and the phase identification was determined by X-ray diffraction (XRD) analysis. Two aspects concluding surface activation and surface roughening were investigated to understand the effect of each on Cu coating. Cu activation process increased surface activity of B 4 C by pre-deposition Cu nano-crystals, which was effective and cost-saving when compared with conventional Pd activation method. The influence of activation pH on electroless Cu coating was discussed and a moderate pH 12 is suitable for Cu deposition. Surface roughening process availably promoted wettability of B 4 C particles with aqueous solution. Etched pits were formed on B 4 C surface and resulted in fresh surface exposed after oxidization roughening process, which was beneficial for Cu bonding and coating on B 4 C surface.
研究领域:
材料科学
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
Micromachines
·
2021
·Vol. 12
·期 10
·1236
·
IF 2.891
Kaiqiang Yang,Jianlong Liu,Ruirui Jiang,Yubin Gong,Baoqing Zeng,Zichuan Yi,Qingguo Gao,Jianjun Yang,Feng Chi,Liming Liu
The nucleation of graphene at different locations in the quartz boat was studied, and the lowest nucleation density of graphene in the quartz boat was found. The nucleation density of graphene is the lowest at the bottom of the quartz boat near the gas inlet side. Based on the above results, a simple and reproducible way is proposed to significantly suppress the nucleation density of graphene on the copper foil during the chemical vapor deposition process. Placing the copper foil with an area of 1.3 cm × 1 cm in the middle of the bottom of the quartz boat or further back, and placing two copper pockets in front of the copper foil, an ultra-low nucleation density of ~42 nucleus/cm2was achieved on the back of the copper foil. Single-crystal monolayer graphene with a lateral size of 800 μm can be grown on the back of copper foils after 60 min of growth. Raman spectroscopy revealed the single-crystal graphene to be in uniform monolayers with a low D-band intensity.Keywords:single-crystal graphene;nucleation density;quartz boat;copper foils;copper pockets
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Haipei Zhang,Bo Li,Yonggang Wei,Hua Wang
Settling time, system temperature and reductant amount play an important role in the recovery of matte from copper slag. This study investigated the settling behavior of matte particles in copper slag and the effects of the settling time, system temperature, and reductant amount on the macrostructure of slag, microstructure of matte particles, and copper loss. The results showed that the settling behavior of matte particles in slag at the experimental temperature was a process of aggregation and growth. With an increase in settling time and temperature, as well as the addition of an appropriate amount of anthracite, the foaming slag layer of the slowly cooled slag gradually disappeared, while the recovery of matte increased. However, when the amount of anthracite was too high, Fe–Cu alloy formed at the experimental temperature, which resulted in worsened fluidity of the matte in the molten slag and copper loss increased. At the experimental temperature, the settling environment of matte particles in the liquid phase layer was superior to that of the foaming slag layer. The novel idea of using rubber seed oil instead of a traditional fossil reductant to clean the copper slag was put forward. At the temperature of 1250 °C, 4 mL of rubber seed oil was injected, resulting in a settling time of ≥90 min, after which the copper content in the upper part of the slowly cooled slag was less than 0.57 wt.%, reaching the acceptable level of discardable slag in industry.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
·
2023
·
IF 4.5
Kun WANG,Yan LIU,Jun HAO,Zhi-he DOU,Guo-zhi LV,Ting-an ZHANG
To recover copper from copper slag, a novel slag cleaning method was proposed. The thermodynamics and binary phase diagram of FeO–SiO 2 were calculated first. Then, the effects of experimental parameters on the reduction of Fe 3 O 4 , recovery of copper, and slag cleaning mechanism were investigated. The results showed that the addition of SiO 2 significantly reduced the initial reduction temperature of magnetite and pyrite. The contents of Fe 3 O 4 and copper decreased to 2.45 wt.% and 0.39 wt.%, respectively, with copper recovery of 92.52% under the optimum conditions. More than 94% silver and 99% gold subsided into the copper matte after slag cleaning. Approximately 72% of zinc and 75% of lead volatilized in the flue gas. The viscosity of the copper slag decreased from 0.68 to 0.12 Pa·s due to the reduction of magnetite. The sedimentation of copper matte droplets could be enhanced by mechanical stirring.
研究领域:
冶金工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mingji Xu,Xi Ran,Ruoli Chen,Maoshen Chen,Ruijuan Qi,Chengqin Dai,Chunhua Luo,Hui Peng,Hechun Lin
Gas sensors based on metal/metal oxide heterostructures have shown rapid advancements due to their excellent sensing performance. However, it is difficult to control the formation of Cu/CuO nanostructure due to the easy oxidation of copper and limits its sensing application. Herein, we reported the controlled oxidation of Cu superfine particles (SPs) to form Cu/CuO nanostructure via reducing CuO with monoethanolamine, oxidized with H 2 O 2 and then in-situ annealed at 250 °C. The organic residue generated during the reducing step plays a key role in controlling the oxidation of Cu SPs to form Cu/CuO nanostructure. The nanomaterial was used to fabricate gas sensor, which presents excellent p-type sensing performance to ethanol with good selectivity and a good linear relationship in the range of 1 to 100 ppm ethanol. The response to 100 ppm ethanol can be up to 99.40 under 200 °C operating temperature, and the response under 250 °C is 30.66 with the shorter response and recovery time of 214 s and 74 s, respectively. The sensing mechanism can be explained by the adsorption–desorption model. This study provides a promising strategy for the synthesis of Cu/CuO nanostructure and open a new avenue for the development of highly sensitive ethanol sensor.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 42
·62994-63004
·
IF 5.19
Lu Yuanyuan,Liu Xuna,Miao Yanjun,Chatzisymeon Efthalia,Pang Lina,Qi Luqing,Yang Ping,Lu Hongyan
Roles of bulk-, micron-, and nano-copper oxide (CuO) on methane production, microbial diversity, functions during thermophilic anaerobic digestion (AD) were investigated in this study. Results showed that bulk-, micron-, and nano-CuO promoted methane production by 27.8%, 47.6%. and 83.1% compared to the control group, respectively. Microbial community analysis demonstrated that different particle sizes could cause various shifts on bacteria community, while had little effect on archaeal diversity. Thereinto, bacteria belonging to phylum Firmicutes and Coprothermobacterota dominated in enhanced hydrolysis process in groups with nano-CuO and bulk-CuO, respectively, while micron-CuO had stronger promotion on the abundances of hydrolytic and fermentative bacteria belonging to families Peptostreptococcaceae, Caloramatoraceae, Erysipelotrichaceae, and Clostridiaceae, than other two CuO sizes. Metabolic pathways revealed that energy-related metabolism and material transformation in bacteria were only boosted by micron-CuO, and nano-CuO and bulk-CuO were important to methanogenic activity, stimulating energy consumption and methane metabolism, respectively.
研究领域:
环境工程
·
微生物学
·
可再生能源
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Jian Lv,Chuncai Kong,Yun Xu,Zhimao Yang,Xiaojing Zhang,Shengchun Yang,Ge Meng,Jinglei Bi,Jianhui Li,Sen Yang
Design and synthesis of binder-free electrodes with active nanomaterials on the surface are expected to enhance electrochemical properties. In the work, a novel thin film formed by assembled CuO nanosheets and ultra-thin Cu 2 O film directly adhered on copper foil was obtained by just simply oxidizing the Cu foil using H 2 O 2 . The obtained product on Cu foil consists of a film assembled by CuO/Cu 2 O nanosheets. The ultrathin CuO nanosheets with large surface area provide adequate active sites for the electrocatalysis and the strong binding will promote the electron transfer between active nanomaterials and Cu substrate. The electrochemical performance shows that this novel structure as an electrode exhibits excellent properties for the non-enzyme glucose sensor, with an ultrahigh sensitivity of 1.541 mA mM −1 cm −2 , a low detection limit of 0.57 μM and the linear range is up to 4 mM. Good stability and high selectivity were also obtained by using CuO/Cu 2 O nanosheets@Cu as a nonenzymatic glucose sensor, and furthermore, the electrode shows powerful reliability for analyzing human serum samples. Therefore, the CuO/Cu 2 O film based on Cu foil binder-free electrode may become a promising nonenzymatic glucose sensor and the work also provides a strategy for the design of electrochemical electrode.
研究领域:
生物医学工程
·
纳米医学
·
电化学传感
·
糖尿病监测
·
转化医学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Zhaoyu Mao,Xiang Gao,Juan Qiu,Chunchao Chen,Kangwei Gongsun,Changming Bu,Qing Zang,Min Yu,Houyi Ma
A simple two-electrode system was utilized to fabricate a layer of CuCl on the surface of bronze for simulating the "bronze disease". The addition of L-arginine (Arg) reduced the conversion time of the CuCl patina in water from 6 h to 3 h and enhanced the protection efficiency of the transformed patina from 27.9 % to 81.8 %. The alkalinity of Arg and its coordination capacity with Cu 2 + facilitate the transformation of CuCl, modify the transformation mechanism, and alter the morphology and structure of the patina. The immersion experiment further substantiates the stability and self-reinforcing properties of the Arg-transformed patina.
研究领域:
材料科学
·
文物保护
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Siqian Liu,Yang Liu,Bo Pan,Ying He,Bowen Li,Dandan Zhou,Yinlong Xiao,Hao Qiu,Martina G. Vijver,Willie J.G.M. Peijnenburg
Humic substances are the dominant dissolved organic matter fraction in the aqueous phase of environmental media. They would inevitably react with chemicals released into the environment. The influence of dissolved humic acid (DHA) on the dissolution and dispersion of copper oxide nanoparticles (CuO NPs, 50 nm, 49.57 mg L −1 ) was therefore investigated in the present study. In addition to dispersing CuO NPs and reducing the size of the aggregates, the amount of released Cu from CuO NPs was found to increase over time with increasing concentrations of DHA, 96% of which was present as organic complexes after 72 h. At DHA concentrations exceeding 16.09 mg C L −1 , the complexation coefficients of DHA with Cu and the adsorptivity of CuO NPs to DHA were both reduced due to increased homo-conjugation of DHA as promoted by negative charge-assisted H-bond. Although the adsorption capacity of DHA kept increasing up to 57.07 mg C L −1 , the hydrodynamic diameter and ζ-potential were similar and the percentages of total released Cu continued to increase linearly to 4.92% at higher levels of DHA (30.13–57.07 mg C L −1 ). Thereupon, DHA promoted the dissolution of CuO NPs in a concentration-dependent fashion. The driving force was complexation of Cu by DHA, rather than the balancing between the exposed and the covered surface area of the CuO NPs due to DHA adsorption. Our findings facilitate understanding the underlying mechanisms on how DHA impacts the CuO NPs environmental behavior (or fate) as well as on their kinetics.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Dongxu Huang,Mingqi Huang,Deliang Sun,Bincan Liu,Rui Xuan,Jinshan Liu,Rong Sun,Jinhui Li,Guoping Zhang,Daquan Yu
The metallization of glass with high density and fine spacing possesses promising application in advanced package in 5 G. However, the adhesion strength between the copper and the smooth glass is still limited. In this paper, a feasible method is developed to prepare ZnO coating on the glass surface which served as an adhesive layer to provide a good anchors of copper layer by electroless copper plating. The results proved the adhesion strength of the copper layer is as high as 5B by grid adhesion test. Furthermore, diethoxy-methyl-(3, 3, 3-trifluoro-propyl)-silane was used to create an optional hydrophobic surface to accomplish a selective electroless copper plating pattern. The electroless copper plating is non-toxic, convenient, low economic cost and reliable and it is expected to realize promising application in system-in-package in the future.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）