INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
·
IF 4.229
Jianxun Zhao,Xiaojie Zhai,Xing Tao,Heng Liu,Wanqiang Liu,Dayong Jiang,Shang Gao
Mechanical alloying technique was used to prepare the Co 0.9 Cu 0.1 Si alloy. Composite materials of Co 0.9 Cu 0.1 Si doping with different amounts of multi-walled carbon nanotubes (MWCNTs) or lithium modified MWCNTs (Li-MWCNTs) were obtained via ball-milling to improve the hydrogen storage performance of Co 0.9 Cu 0.1 Si. XRD , SEM and TEM were used to analysis the structural properties of the samples. A three-electrode battery system was carried out to test the electrochemical properties . After the addition of MWCNTs, the composites showed higher discharge capacity, stronger HRD, better cyclic stability and lower charge-transfer resistance than the original Co 0.9 Cu 0.1 Si alloy. The electro-catalytic function of MWCNTs, the reduction of particle size and the raise of specific surface area for Co 0.9 Cu 0.1 Si alloy may provide larger electrochemically accessible area and rapid channel for hydrogen transportation , which are important to enhance the electrochemical performance of the alloy. Moreover, a further improvement was achieved after the addition of Li-MWCNTs, illustrating that the MWCNTs and lithium species had synergistic effects in improving the discharge capacity and reaction kinetics of the Co 0.9 Cu 0.1 Si alloy electrode. As the weight ratio of the alloy and Li-MWCNTs was 15:1, the optimal discharge capacity of 624.4 mAh/g and the highest capacity retention of 67.5% were achieved.
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高影响因子
Chinese Physics B
·
2018
·Vol. 27
·期 6
·066108
·
IF 1.321
Qing Yu,Jiangjian Shi,Pengpeng Zhang,Linbao Guo,Xue Min,Yanhong Luo,Huijue Wu,Dongmei Li,Qingbo Meng
A study of the self-healing phenomenon of Cu2ZnSn(S, Se)4 (CZTSSe) solar cells has shown more than 10% enhancement in cell performance after storage at room temperature for a week, with a significant improvement in the open-circuit photovoltage (Voc) and fill factor (FF). In addition, up to 10.45% power conversion efficiency (PCE) has been achieved. No obvious change in crystallinity, crystal phase, optical absorption or elemental distribution in the CZTSSe films was detected on examining the x-ray diffraction (XRD) pattern, Raman spectrum, ultraviolet-visible (UV-Vis), and TOF-SIMS. Further investigations on the charge carrier concentration, charge radiative recombination, and band structure suggest that the enhancement in PCE stems mainly from a reduction in deep defects of the CZTSSe semiconductor film.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2018
·
IF 3.046
Xiaoshan Yang,Xiufang Cui,Guo Jin,Jinna Liu,Yanbo Chen,Zhe Liu
Laser additive manufacturing (LAM) is a novel method for processing compositionally graded alloys and becomes increasingly important in the context of next-generation manufacturing technology. In this work, (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 soft magnetic alloys with different laser power were designed and processed by the LAM. The magnitudes of magnetic properties were analyzed, and the relationships among composition-microstructure-magnetic properties assessed. Results show that the (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys by LAM exhibits relative uniform microstructure and comparable magnetic property compared with those conventional processed alloys. The bcc dominated microstructures exhibit a substantially higher saturation magnetization (Ms). With the increase in power, the average grain size of the alloy increased slightly and the increasing volume fraction of the Fe Si phase leaded to the enhancement of magnetization. The (Fe 60 Co 35 Ni 5 ) 78 Si 6 B 12 Cu 1 Mo 3 alloys with laser power of 3000 W exhibits the highest Ms (199 emu/g). The appearance of Fe 3 B results in coarse dendrites and high coercivity (Hc) in the multiple re-heating cycles.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
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2018
·Vol. 48
·期 4
·1840-1845
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IF 1.566
Sun Fu-Hua,Dong Jinfeng,Tang Huaichao,Zhuang
Hua-Lu,Li Jing-Feng
Cu 12 Sb 4 S 13 tetrahedrite is an abundant natural that is also environmentally friendly. There have been efforts made to reach a unity of ZT value through optimizing the interdependence of electrical and thermal performance. In this study, we reported on ZnO nanoparticles-dispersed Cu 11.5 Ni 0.5 Sb 4 S 13− δ composites that were synthesized by the mechanical alloying and spark plasma sintering method. The structural characterizations were conducted via scanning electron microscopy, electronic probe microscopic analysis and transmission electron microscopy. The ZnO-nanoparticles were uniformly distributed in the Cu 12 Sb 4 S 13 grains. ZnO was used as a heterogeneous nucleation site to reveal the effectiveness of reducing thermal conductivity, likely derived from the strong low/mid-frequency phonon scattering. The lowest lattice thermal conductivity, 0.33 W m −1 K −1 , was obtained at 673 K in 0.5 vol.% of ZnO sample. A small quantity of ZnO addition led to a high ZT ∼ 1.0 at 723 K, which increased by ∼ 42% in the pure-phased Cu 12 Sb 4 S 13− δ sample.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2018
·
IF 3.909
Cihui Tian,Sajid Asghar,Yurui Xu,Zhipeng Chen,Jingwei Zhang,Qineng Ping,Yanyu Xiao
Redox-sensitive micelles based onhydrophilic hyaluronic acid-ss-hydrophobic curcumin conjugate were designed as a novel delivery system for gliomas targeting. Furthermore, the obtained micelles were further functionalized with Tween 80 (CUR-THSC) for better brain penetration. Dynamic light scattering experiment and in vitro release study showed that the synthetic disulfide-linked conjugate possessed redox-sensitivity under high glutathione conditions. Spherical micelles with a mean particle size of 74.2 nm, negative zeta potential (−30.25 mV), high entrapment efficiency (94.12%) and drug loading (8.9%) were obtained. XRD analysis of micelles revealed amorphous form of the encapsulated drug. CUR-THSC micelles showed good plasma stability and did not induce any hemolysis in erythrocytes. In addition, highest cytotoxicity in G422 cells was observed compared to the free curcumin group and non-sensitive micelles group. These results indicate that the Tween 80-modified hyaluronic acid-ss-curcumin micelles could emerge as a promising platform for the delivery of curcumin in the treatment of gliomas.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Zequn Yang,Hailong Li,Chen Liao,Jiexia Zhao,Shihao Feng,Pu Li,Xi Liu,Jianping Yang,Kaimin Shih
Rattle-type Fe3O4@CuS synthesized using a two-step method was applied for elemental mercury (Hg0) adsorption in coal combustion flue gas for the first time. The Fe3O4 with strong magnetization was an ideal candidate as a core to make the sorbent recyclable, while the stabilized ultrathin CuS shell assured that the Fe3O4@CuS had a higher Brunauer–Emmett–Teller (BET) surface area with more exposed active sites and stronger magnetization. The optimal operating temperature of 75 °C allowed for the injection of the sorbent between the wet desulfurization (WFGD) and wet electrostatic precipitator (WESP), which removed the detrimental influence of nitrogen oxides. Simulated flue gas (SFG) in this section showed a slight inhibitive effect on Hg0 adsorption over the Fe3O4@CuS, mainly due to the presence of water vapor (H2O). The inhibition of H2O was proven to be the result of an active site prevention effect instead of the widely recognized competitive adsorption effect. The adsorption capacity and rate of the Fe3O4@CuS for Hg0 capture reached 80.73 mg g–1 and 13.22 μg (g min)−1, which were the highest values among the magnetic sorbents currently reported for Hg0 removal from coal combustion flue gas. These properties allowed the sorbent to maintain a 100% Hg0 capture efficiency for more than 20 h with only a 50 mg dosage when no regeneration step was applied. Meanwhile, the contacting time between the sorbent and Hg0 was generally less than 5 s in a typical sorbent injection process. Polysulfides dominated the capturing process and primarily contributed to the extremely high adsorption capacity/rate. A multistep reaction mechanism was proposed to explain the Hg0 adsorption over Fe3O4@CuS. At the first stage, polysulfide participated in Hg0 adsorption as the most active component and was consumed rapidly. After that, S–S dimers, sulfides, and even copper-terminated sites functioned as the adsorption centers. The as-formed mercury–copper (Hg–Cu) amalgam was transformed into mercury sulfide (HgS), a process that was dependent on the extent of the saturation of sulfide sites. With these advantages, Fe3O4@CuS is a promising, cost-effective, highly recyclable, and efficient alternative to the traditional activated carbon for capturing Hg0 in coal combustion flue gases.
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ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2018
·
IF 3.974
Zhiyue Liao,Huabin Cao,Xueyan Dai,Chenghong Xing,Xiongwei Xu,Gaohui Nie,Caiying Zhang
To investigate the toxic effects of Molybdenum (Mo) and Cadmium (Cd) on trace elements in digestive organs of Shaoxing duck ( Anas platyrhyncha ), 120 Shaoxing ducks were randomly divided into control group and 5 treatment groups which were treated with a commercial diet containing different dosages of Mo and Cd. On the 60th and 120th days, the beak, esophagus, glandular stomach, muscular stomach, small intestine, large intestine and feces were collected to determine contents of Mo, Cd, copper (Cu), iron (Fe), zinc (Zn) and selenium (Se), then correlation analysis was performed. The results showed that Cd content in digestive organs significantly increased in co-treated groups compared to single treated groups and Mo concentration increased in Mo-treated groups compared to control group, whereas Cu, Fe, Zn and Se concentrations in digestive organs decreased in co-treated groups. Furthermore, Cd and Mo were mainly accumulated in the small intestine and esophagus, respectively. There was a strongly positive correlation between Cd and Mo while they had negative correlation with Cu, Fe, Zn and Se, respectively. In feces, Mo and Fe contents in high dose of Mo group and high Mo combined with Cd group were significantly higher than those in control group, and Cu content in all treated groups significantly increased and Cd, Zn and Se concentrations had no difference. The results indicated that dietary Mo or/and Cd might disturb homeostasis of trace elements in digestive organs of Shaoxing duck. Moreover, the two elements presented a synergistic relationship.
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PubMed
高影响因子
ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY
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2018
·
IF 2.776
Min Xu,Huaqiao Tang,XueRong Zhou,Helin Chen,Qi Dong,Yuanli Zhang,Gang Ye,Fei Shi,Cheng Lv,Bo Jing,Changliang He,Ling Zhao,Yinglun Li
Copper nanoparticles (Cu NPs) have widespread application because of their special physicochemical characteristics, however we need to more clearly study the toxicity mechanism of Cu NPs to ensure its safe use in pharmaceutical and animal feed. Thus, the aim of this study was to evaluate the effects and mechanisms of sub-chronic exposure to Cu NPs on renal CYP450 s of rats. In this study, we investigated the effects of Cu NPs on renal oxidative stress, cytokines and histopathology of rats. We found that Cu NPs (200 mg/kg) significantly disordered the function and structure of the kidney and caused a dose-dependent increase in oxidative stress and cytokines, which significantly decreased the levels of mRNA, protein, and activity of CYP450 s. Micro-coppers (Cu MPs) and Cu ions have similar effects, but their effects on CYP450 s were weaker than Cu NPs. The expression of nuclear receptors were inhibited and the expression of Akt, STAT3/5, CREB, p70S6K, NF-κB, P38 and ERK1/2 were activated when the inhibition effects of CYP450 s activity were observed in renal of rats. Therefore, we believe that Cu NPs can activate the STAT, NF-κB and MAPK signaling pathways to down-regulate the expression and activity of CYP450 s by inducing oxidative stress and inflammatory response in rat kidney.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Baosong Li,Dandan Li,Wei Chen,Yuying Liu,Jun Zhang,Yulei Wei,Weiwei Zhang,Wanchun Jia
Ni-W/TiN nanocomposite coatings were successfully prepared via pulse electroplating from an electrolyte containing suspended TiN nanoparticles . The effects of applied current density and deposition time on microstructure, morphology, composition, hardness and electrochemical behaviors of the obtained coatings were investigated. Results showed that the current density and deposition time affect remarkably the electrochemical co-deposition process and then the structure and characteristics of the composites. It illustrated that the nanocomposites are uniform, compact and crack-free. The nanocomposites prepared at I a = 3 A dm −2 and t = 20 min had the finest structure, showing a fine and smooth surface. EDS mapping and XPS spectra illustrated that the TiN nanoparticles had been homogeneously dispersed throughout the coating. 2.34 wt% TiN nanoparticles were embedded in Ni–W (68.56 wt% Ni and 29.1 wt% W) alloy matrix at I a = 3.0 A dm −2 . The inclusion of TiN nanoparticles in Ni–W could promote the nucleation and cause a distinct microstructural change. The crystallite size was in the range of 11–15 nm. The average roughness value ( R a ) is 65.7 nm and 73.8 nm for coating formed at 20 min and 40 min, respectively. The electrochemical measurements illustrated that I a = 3–5 A dm −2 and t = 40–60 min was the optimal operating parameters for the excellent anti-corrosion properties of Ni–W/TiN nanocomposites. The embedded TiN in Ni–W matrix could fill defects then improve its corrosion resistance . This electrodeposited Ni–W/TiN nanocomposites possess excellent hardness and superior corrosion resistance , and is expected to be applied in aggressive environment as a protective coating.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 29
·期 24
·20832-20839
·
IF 2.324
Dong Jiannan,Wang Zhongyang,Sun Kai,Jiang Qian,Xie Peitao,Fan Guohua,Qu Yunpeng,An Liqiong,Fan Runhua
Capacitors with a high dielectric constant and low dielectric loss are highly demanded for electronic applications, such as electric devices and energy storage. To enhance the performance of those electronic applications, it is of great significance to achieve capacitors with stable dielectric property both in a broad ranges of frequency and temperature. In this research, flexible Acrylic-polyurethane/copper (APU/Cu) composites with different filler fractions were successfully synthesized. Excellent flexibility of APU/Cu composites is maintained even when Cu particles reached to 19.11 vol%. The dielectric and thermal properties of APU/Cu composites were systematically investigated. Enhanced dielectric constant and lower dielectric loss were achieved. Meanwhile, it is found that the permittivity fluctuated slightly with the increase of frequency and temperature, suggesting that permittivity was independent on frequency and temperature over a broad range. This research shed lights on the application of APU/Cu composites in flexible thin-film capacitors and stretchable electronic devices.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Youchen Gu,Chen Ye,Xuewen Yin,Jianhua Han,Yu zhou,Heping Shen,Jianbao Li,Xiaojing Hao,Hong Lin
Cadmium sulfide (CdS) is the most widely used buffer material for a variety of thin-film solar cells including Cu 2 ZnSnS 4 . However, reports have shown that CdS film obtained by chemical bath deposition (CBD) is not the ideal buffer layer for pure sulfide CZTS solar cell. Zinc doping is a viable approach to modifying the CdS buffer film, but the present methods are far from satisfactory. Here, we innovatively developed an effective way of Zinc doping using partial electrolyte (PE) treatment, resulting in state-of-the-art buffer layer for solar cells based on high-surface-waviness CZTS light absorber. Our study shows that this Zn PE-treated CdS film improved the properties including coverage, full-range light transmittance and conduction band alignment with CZTS. Ultimately, the resultant modified CdS film boosted the open-circuit voltage of our devices by more than 100 mV, yielding power conversion efficiency (PCE) of 3.30%. We note that this is the highest efficiency that has been reported for all solution-processed CZTS solar cells.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Xiaopeng Han,Ying Huang,Qiao Gao,Meng Yu,Xuefang Chen
Weak interfacial bonding and the agglomeration of reinforcements are critical challenges for the expected performance in thermal management materials, hindering the extensive application of aluminum matrix composites. In this work, Cu particles, nanotubes, Ag-coated graphite flakes and films, urea, and starch were mixed together to fabricate porous preforms, which then were infiltrated by vacuum gas pressure at 720 °C. The effects of graphite film thickness on the microstructure and properties of thermal conductivity (TC) and coefficient of thermal expension were investigated. The nanotube@Cu/Ag@graphite/aluminum composites exhibited a high TC of 451 W/mK and excellent bending strength of 74 MPa, which were approximately increased by 48.8% and 126%, respectively, as compared with the samples without graphite film.
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高影响因子
危险品化学品经营许可证（带存储）