INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Kun Wang,Dongying Ju,Guiying Xu,Yongfei Wang,Shaobei Chen,Jian Zhang,Yuyuan Wu,Weimin Zhou
The new functional FeO/C composite carbon materials are successfully fabricated by controlling the adding amounts of Fe 3 O 4 particles in mixtures of coal tar pitch and Fe 3 O 4 particles. The structures of prepared FeO/C composite carbon materials were verified by XRD measurements. The excellent electrochemical performances of FeO/C composite carbon materials were evaluated in detail. For instance, the prepared materials show the high cycling performances at 679 mAh/g after carrying out charge-discharge 100 cycles. Meanwhile, the high rate performances and long cycle life characteristics of FeO/C composite materials were also observed. As a result, it is palpable that the carbon contents and specific area are the vital factors to improve the electrochemical performances of FeO/C composite materials, which effectively provides the reference to design the transition metal oxide/carbon composite materials as Li + ion storage materials.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2018
·
IF 4.244
Lin Hao,Weihua Liu,Chun Wang,Qiuhua Wu,Zhi Wang
Metal-organic coordination materials have received extensive attention because of their combined benefits of both inorganic and organic building blocks. In this work, the functional magnetic metal-phenolic networks with core-shell structure were prepared from phenolic ligand (tannic acid) and metal Zn 2+ via self-assembly. The magnetic metal-phenolic networks consist of magnetic Fe 3 O 4 core and metal-phenolic network shell which can act as carbon source. The Fe 3 O 4 @C nanocomposite was then synthesized by carbonizing the magnetic metal-phenolic networks. The prepared Fe 3 O 4 @C had a high surface area and nanoscale porosity. It was successfully applied as the magnetic absorbent to enrich chlorophenols from environmental water and soil samples. Good response linearity for the analytes was observed in the range of 0.1–100.0 ng mL −1 for water and 1.0–100.0 ng g −1 for soil samples, with correlation coefficient ≥ 0.9989 and ≥ 0.9924, respectively. The limits of detection calculated at a signal-to-noise ratio of 3 (S/N = 3) were in the range from 0.01 to 0.03 ng mL −1 for the water and 0.1–0.2 ng g −1 for the soil sample, respectively. The relative standard deviations were below 6.8%.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Micromachines
·
2018
·Vol. 9
·期 10
·501
·
IF 2.222
Shuren Song,Da Chen,Hongfei Wang,Chaohui Li,Wei Wang,Wangli Yu,Yanyan Wang,Qiuquan Guo
Measurement of hemostatic parameters is essential for patients receiving long-term oral anticoagulant agents. In this paper, we present a shear mode bulk acoustic resonator based on an inclinedc-axis aluminum nitride (AlN) film for monitoring the human hemostatic parameters. During the blood coagulation process, the resonant frequency of the device decreases along with a step-ladder profile due to the viscosity change during the formation of fibers in blood, revealing the sequential coagulation stages. Two hemostatic parameters with clinical significance, prothrombin time (PT) along with its derived measure of international normalized ratio (INR), are determined from time-frequency curves of the device. Furthermore, the resonator is compared with a commercial coagulometer by monitoring the hemostatic parameters for one month in a patient taking the oral anticoagulant. The results are consistent. In addition, thanks to the excellent potential for integration, miniaturization and the availability of direct digital signals, the proposed device has promising application for point of care coagulation monitoring.Keywords:bulk acoustic wave;AlN film;hemostatic parameters;viscosity sensor
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 18
·13143-13155
·
IF 2.993
Li Jie,Chen Chao,Qin Furong,Jiang Yongjia,An Hao,Fang Jing,Zhang Kai,Lai Yanqing
Cobalt–nitrogen-doped mesoporous carbon (Co–N–C) is synthesized as a host for lithium–sulfur batteries. With the Co–N–C composite as a sulfur host, the initial capacity of lithium–sulfur batteries is as high as 1290.8 mA h g −1 at 0.2 C, and Li–S batteries still exhibit good cycling stability and high capacity with a retained capacity of 795.7 mA h g −1 and a nearly 100% coulombic efficiency after 300 cycles. The good performance of Li–S batteries can be attributed to a higher specific surface area and pore volume of the carbon matrix and good chemical affinity of Co and N elements toward polysulfides. It is found that Co–N–C composite can effectively adsorb lithium polysulfide by physical, chemical adsorption and well inhibit the shuttle effect. In addition, Co–N–C composite which act as a catalyst can also significantly promote the conversion of polysulfide, accelerate the kinetics, thereby improving the performance of Li–S batteries.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2018
·Vol. 15
·期 5
·1146-1156
·
IF 1.165
Qingliang Shan,Jianbao Hu,Yanmei Kan,Dewei Ni,Le Gao,Xiaowu Chen,Shaoming Dong
Si-B-C ceramics were prepared through reaction sintering, and the influence of Al 2 O 3 addition on the high-temperature (1100-1300°C) oxidation behavior of the material under air atmosphere was studied. The erosion behavior and mechanism are determined from the measurement of weigh changes, microstructure observations, and characterization of the generated oxides on postexposure specimens. Results show that Al 2 O 3 is enriched in the oxidized layer, inhibiting the volatilization of B 2 O 3 and impeding the crystallization ability of oxide (cristobalite). Narrower erosion layer and less weigh change are observed with Al 2 O 3 . Low-frequency Raman results reveals that with the increase in Al 2 O 3 , the bending vibrations of the BO 4 units and B-O-B stretching of the metaborate ring relative intensity are enhanced. Furthermore, high-frequency Raman results shows that the relative proportion of high-dimensional vibration modes Q 3 and Q 4 which result in a higher viscosity of melt and a greater resistance of oxygen diffusion are positively correlated with Al 2 O 3 .
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2018
·
IF 4.155
Osin Oluwatomiwa A.,Yu Tianyu,Cai Xiaoming,Jiang Yue,Peng Guotao,Cheng Xiaomei,Li Ruibin,Qin Yao,Lin Sijie
The photocatalytic activity of TiO2 based photocatalysts can be improved by structural modification and elemental doping. In this study, through rational design, one type of carbon and nitrogen co-doped TiO2 (C, N-TiO2) photocatalyst with mesoporous structure was synthesized with improved photocatalytic activity in degrading 4-nitrophenol under simulated sunlight irradiation. The photocatalytic degradation efficiency of the C, N-TiO2 was much higher than the anatase TiO2 (A-TiO2) based on absorbance and HPLC analyses. Moreover, using zebrafish embryos, we showed that the intermediate degradation compounds generated by photocatalytic degradation of 4-nitrophenol had higher toxicity than the parent compound. A repeated degradation process was necessary to render complete degradation and non-toxicity to the zebrafish embryos. Our results demonstrated the importance of evaluating the photocatalytic degradation efficiency in conjunction with the toxicity assessment of the degradation compounds.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2018
·Vol. 23
·期 9
·2343
·
IF 3.098
Huijuan Wang,Tingting Feng,Donggui Guo,Min Zhang,Lin Chen,Ying Zhou
Sanggenon C (SC), which is a natural flavonoid found in the stem bark of Cortex Mori, has been discovered to have the antioxidant, anti-inflammatory, and antitumor properties. However, its effect in osteoporosis has not yet been reported. In this research, the effect of SC on the proliferation of MC3T3-E1 cells was evaluated by using the MTT assay. Alkaline phosphatase (ALP) activity and the mRNA expression ofRunx2,Collagen I,OPG, andRANKLwere examined. TRAP-positive cell counting and bone resorption pits were adopted to observe the effect of SC on the formation and function of osteoclasts. Next, the mRNA level ofTRAP,CTSK,NFATc1, andTRAF6of osteoclasts were measured by real-time qPCR. In addition, the anti-osteoporosis activity of SC in vivo was evaluated in the zebrafish model. Our study indicated that SC exhibited a significant stimulatory effect on MC3T3-E1 cell proliferation at 1 to 10 μM and caused an increase in ALP activity at 0.3 to 10 μM. It could upregulate the expression ofRunx2,Collagen I, and increases theOPG/RANKL ratio. Furthermore, SC was found to inhibit the formation and function of osteoclasts, which is demonstrated by a lower number of TRAP-positive multinuclear cells and a fewer area of bone resorption pits compared to the control group.TRAP,CTSK, andNFATc1were downregulated in 0.3 to 10 μM SC treated groups. In addition, 3 to 10 μM SC also inhibited the expression ofTRAF6mRNA. When prednisone-induced zebrafish was treated with 0.3, 1, 3, and 10 μM SC, higher mineralization of vertebrate column was discovered in a dose-dependent pattern, which suggests that SC could reverse the bone loss of zebrafish caused by prednisone. In summary, these findings indicated that SC has the potential to prevent or treat osteoporosis.Keywords:Sanggenon C;osteoblast;osteoclast;osteoporosis;zebrafish
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Jingying Duan,Guohui Qin,Luofu Min,Yuchen Yang,Chengyang Wang
The photochemistry and sodium storage process have been generally considered as two separated approaches without strong connection. Here, ultraviolet (UV) irradiation was applied to sodium-ion batteries to improve the electrochemical performance of MoS2-based composites. C@MoS2@CN nanospheres consist of double protective structures, including inner hollow carbon spheres with a thin wall (C) and outer N-doping carbon nanosheets (CNs) derived from polydopamine. The special nanostructure possesses the virtues such as wide-interlayer spacing, flexible feature with great structure integrity, and rich active sites, which endow the fast electron transfer and shorten the ion diffusion pathways. Under the excitation of UV-light, intense electrons and holes are accumulated within MoS2-based composites. The excited electrons can promote the preinsertion of Na+. More importantly, dense electrons promote the electrolyte to decompose and hence form a stable solid electrolyte interphase in advance. After UV-light irradiation treatment in the electrolyte, the initial Coulombic efficiency of C@MoS2@CN electrodes increased from 48.2 to 79.6%, and benefiting from the fine nanostructure, the C@MoS2@CN electrode with UV irradiation treatment delivered a great rate performance 116 mAh g–1 in 20 s and super cycling stability that 87.6% capacity was retained after 500 cycles at 500 mA g–1. When employed as anode for sodium-ion hybrid capacitors, it delivered a maximum power density of 6.84 kW kg–1 (with 114.07 Wh kg−1 energy density) and a maximum energy density of 244.15 Wh g–1 (with 152.59 W kg–1 power density). This work sheds new viewpoints into the applications of photochemistry in the development of energy storage devices.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 7
·4675-4683
·
IF 1.354
Zhao Xiaoxu,Yi Chengwu,Zhang Menghan,Ma Changchang,Li Chunmei,Yan Yongsheng
Fe3O4/C/BiVO4 composite photocatalyst was fabricated successfully by a simple approach using yeast as a carbon source. Fe3O4/C/BiVO4 sample exhibited higher efficiency for photocatalytic degradation of tetracycline (TC)
as compared to pure BiVO4 under visible light. In addition, after five recycles of photodegradation of TC, Fe3O4/C/BiVO4 showed a slight loss in photocatalytic activity, which confirmed its stability and long-time reusability. The photocatalytic
mechanism was studied by active species trapping experiments, which revealed that the holes (h
+) and superoxide radical (˙O−
2) played a key role in TC degradation. Moreover, photocatalyst could be easily recycled by an external magnetic field
and reused without any loss in photocatalytic activity. This work provides a simple, eco-friendly and exemplary strategy for improving photodegradation activity of BiVO4-based photocatalyst.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2019
·
IF 3.579
Mohan Zhang,Xin Yang,Wan Xu,Xiaobo Cai,Mingxiang Wang,Yuying Xu,Peilin Yu,Jun Zhang,Yifan Zheng,Jiang Chen,Jun Yang,Xinqiang Zhu
High sugar content in beverage or food can affect the aging process, and thus natural/artificial sweeteners are widely used as substitutes. However, whether sweeteners have such adverse effects as sugar remains to be clarified. Therefore, in the current study, three sulfa sweeteners, namely, saccharin sodium salt hydrate (SAC 2 ), sodium cyclamate (CYC 3 ) and acesulfame potassium (AceK 4 ) were evaluated for their effects on the lifespan, deposition of lipofuscin, exercise activity, food intake, and intestinal fat deposition (IFD 5 ) of Caenorhabditis elegans ( C. elegans 6 ). It was shown that SAC at 0.3 and 10 mg/mL shortened the lifespan of C. elegans and impaired the exercise capacity, while at other concentrations no significant effects were observed. In contrast, CYC at 0.1, 1 and 10 mg/mL prolonged the lifespan of C. elegans. On the other hand, AceK at 1 mg/mL increased the lifespan of C. elegans , and could decrease both lipofuscin deposition and IFD in a dose-dependent manner. Taken together, these results indicated that although SAC, CYC, and AceK all belong to the sulfa sweeteners, each has distinct effects on different physiological activities associated with aging, at least in C. elegans .
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 11
·A2502
·
IF 3.662
Liang Yu,Qingfeng Yi,Guang Li,Yao Chen,Xiaokun Yang
Precious metal-free C-N composites possess great significance as replacements for Pt-based catalysts used as cathodes in fuel cells. Herein, we have fabricated the Fe/Co-doped C-N composite catalysts, marked as C-N, Co/C-N and Fe-Co/C-N, by direct pyrolysis of the dried suspensions consisting of cobalt/iron salt, dicyandiamide and glucose. For the Fe-Co/C-N catalyst, its morphological texture is characterized by Fe-Co nanoparticles and hollow bamboo-like nitrogen-doped carbon nanotubes (C-N nanotubes). The electroactivity of the prepared samples for oxygen reduction reaction (ORR) in a neutral medium has been investigated. The catalyst Fe-Co/C-N presents the highest ORR current density of 5.1 mA·cm−2 @0.8V (vs Ag/AgCl) in a neutral medium. A zinc-air battery in neutral KNO3 solution, assembled with zinc as the anode and carbon paper loaded by the prepared catalysts as the air electrode (cathode), displays excellent and stable discharge performance. The maximum power density of the Fe-Co/C-N catalyst is 32 mW·cm−2, and the continuous discharge time reaches 209, 155, 17 h at constant discharging current density of 25, 50 and 100 mA·cm−2 respectively. Simultaneously, the air electrode using the Fe-Co/C-N as the catalyst shows good cycle stability and repeatability. Results reveal that the Fe-Co/C-N is a very promising cathodic catalyst applied in neutral zinc-air battery.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Lin He,Yimin Gao,Yefei Li,Zhiwei Liu,Weiyao Zhang,Guangcan Zhou,Hongying He,Siyong Zhao,Honggang Liu,Wentao Yan
Ti(C,N)-304ss cermets with various rare earth yttrium addition were fabricated via powder metallurgy . Fe and Cr atoms dissolved into Ti(C,N) grains and formed a core-rim structure. The first-principle method was employed to calculate the lattice parameters and elastic modulus of the solid solution. The formation of solid solution not only reduced the lattice misfit between the binder phase and hard phase but also improved the hardness of hard phase. The in-situ formed nano-Y 2 O 3 particles existed at the center of Ti(C,N) grains acting as ‘mid effect’ heteromorphic nuclei. The microstructure of cermets was refined with Y addition and the abnormal growth of hard phase was suppressed. The mechanical properties were also improved with Y addition. When the Y content reached 0.3 wt%, the optimal mechanical properties were obtained with a TRS value of 1527 MPa and a hardness value of 91.7 HRA.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）