Nano Research
·
2017
·Vol. 10
·期 11
·3629-3637
·
IF 7.354
Li Bo,Chen Shuangming,Tian Jie,Gong Ming,Xu Hangxun,Song Li
Highly efficient and durable water oxidation electrocatalysts are critically important in a wide range of clean energy technologies, including water electrolyzers and rechargeable metal-air batteries. Here, we report a novel sonochemical approach to synthesize amorphous nickel-iron oxides/carbon nanohybrids with tunable compositions for the oxygen evolution reaction (OER). The sonochemically synthesized amorphous electrocatalysts with optimal composition exhibit a low overpotential of 290 mV at 10 mA·cm −2 and a Tafel slope of 31 mV·decade −1 in a 0.1 M KOH electrolyte, outperforming the benchmark RuO 2 catalyst. Meanwhile, these nanohybrids are also highly stable and remain amorphous even after prolonged cycling. In addition to amorphism, sonochemistry endows as-prepared nickel-iron oxides/carbon nanohybrids with a simultaneously formed carbon scaffold and internal Ni(0), which can enhance the stability and activity for the OER. This work demonstrates that sonochemistry is a unique method for synthesizing amorphous metal oxides toward an efficient and durable OER.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2017
·Vol. 28
·期 18
·13556-13564
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IF 2.019
Cheng Chaoliang,Li Junjie,Shi Tielin,Yu Xing,Fan Jinhu,Liao Guanglan,Li Xiaoping,Cheng Siyi,Zhong Yan,Tang Zirong
Due to low melting temperature, low price and high conductivity, copper nanoparticles have great potential to substitute conductive polymers, silver and gold nanoparticles and others in conductive inks. Here we developed a new, simple and green method to synthesize copper nanoparticles, which have the average size of around 140 nm and show remarkable ability to prevent oxidation. Using the copper nanoparticles for conductive ink, the electrical performance of copper film by depositing copper ink on polyimide was also investigated with the sintering temperature from 150 to 400 °C. The electrical resistivity is around 17.0 μΩ cm under sintering temperature of 250 °C, and can reach as low as 5.7 μΩ cm under the temperature of 400 °C. The proposed approach to synthesize copper nanoparticles for high performance conductive ink presents potential applications in flexible electronics.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2017
·Vol. 24
·期 19
·16220-16227
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IF 2.741
Xu Xiangyang,Gao Xinyi,Jin Jie,Vidonish Julia,Zhu Liang
A novel laboratory-scale bioelectrode and anaerobic sludge coupled system was established for the enhancement of p -chloronitrobenzenes ( p -ClNB) reductive transformation with addition of magnetite nanoparticles. In this coupled system, the bioelectrodes were supplied with a voltage of 0.8 V and the amount of magnetite nanoparticles was set at 7.4 mL/400 mL. Results showed that high p -ClNB transformation rate of 0.284 h −1 and high p -chloroaniline ( p -ClAn) dechlorination rate of 0.082 h −1 were achieved in the coupled system at p -ClNB initial concentration of 30 mg L −1 , and p -ClAn is one of the reductive products of p -ClNB. The cyclic voltammetry curve showed that when the potential was −1000 mV, the magnetite-biocathode current was about 10.7 times of the abiotic cathode. Also, a shift in the reductive peak potential and a dramatic increase in reductive peak current were observed. These findings suggest that magnetite nanoparticles could enhance the electrocatalytic activity and may act as electron conduits between microorganisms or between electrodes and microorganisms to promote the extracellular electron transfer.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Li Shan-Shan,Guan Qi-Yuan,Meng Gang,Chang Xiao-Feng,Wei Ji-Wu,Wang Peng,Kang Bin,Xu Jing-Juan,Chen Hong-Yuan
Better understanding the drug action within cells may extend our knowledge on drug action mechanisms and promote new drugs discovery. Herein, we studied the processes of drug induced chemical changes on proteins and nucleic acids in human breast adenocarcinoma (MCF-7) cells via time-resolved plasmonic-enhanced Raman spectroscopy (PERS) in combination with principal component analysis (PCA). Using three popular chemotherapy drugs (fluorouracil, cisplatin and camptothecin) as models, chemical changes during drug action process were clearly discriminated. Reaction kinetics related to protein denaturation, conformational modification, DNA damage and their associated biomolecular events were calculated. Through rate constants and reaction delay times, the different action modes of these drugs could be distinguished. These results may provide vital insights into understanding the chemical reactions associated with drug-cell interactions.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 409
·期 13
·3483-3493
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IF 3.431
Feng Liuxing,Wang Jun,Cui Yanjie,Shi Naijie,Li Haifeng,Li Hongmei
Three reference materials, at relatively low, middle, and high concentrations, were developed for analysis of the mass fractions of electrolytes (K, Ca, Na, Mg, Cl, and Li) in human serum. The reference materials were prepared by adding high purity chloride salts to normal human serum. The concentration range of the three levels is within ±20% of normal human serum. It was shown that 14 units with duplicate analysis is enough to demonstrate the homogeneity of these candidate reference materials. The statistical results also showed no significant trends in both short-term stability test for 1 week at 40 °C and long-term stability test for 14 months. The certification methods of the six elements include isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS), inductively coupled plasma optical emission spectroscopy (ICP-OES), atomic absorption spectroscopy (AAS), ion chromatography (IC), and ion-selective electrode (ISE). The certification methods were validated by international comparisons among a number of national metrology institutes (NMIs). The combined relative standard uncertainties of the property values were estimated by considering the uncertainties of the analytical methods, homogeneity, and stability. The range of the expanded uncertainties of all the elements is from 2.2% to 3.9%. The certified reference materials (CRMs) are primarily intended for use in the calibration and validation of procedures in clinical analysis for the determination of electrolytes in human serum or plasma.
Certified reference materials for K, Ca, Mg, Na, Cl and Li in human serum (GBW09124-09126)
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 6
·1721-1727
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IF 4.58
Wang Guixiang,Han Rui,Feng Xiuying,Li Yinan,Lin Jiehua,Luo Xiliang
A conducting polymer composite was prepared from nano-sized hydroxyaptite (nHAp) doped into poly(3,4-ethylenedioxythiophene) (PEDOT) and then electrodeposited on a glassy carbon electrode (GCE). The nHAp carries carboxy groups and therefore is negatively charged at moderate pH value. When doped into PEDOT (PEDOT-nHAp), it forms a uniform and stable film that exhibits low electrochemical impedance, a large specific surface, and high activity toward the electrochemical oxidation of nitrite. Under optimized conditions and at a relatively low working potential of 0.78 V (vs. SCE), the modified GCE exhibited a linear amperometric response in the 0.25 μM to 1.05 mM nitrite concentration range, and the limit of detection is as low as 83 nM.
A highly sensitive nitrite sensor was developed based on conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) doped with carboxyl group functionalized hydroxyapatite nanoparticles, which exhibited a large surface area and good conductivity and stability.
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WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
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2017
·Vol. 33
·期 2
·1-14
·
IF 1.658
Guan Jian,Shen Songdong,Wu Hao,Liu Xin,Shen Weijie,He Yuan,Duan R.
The filamentous Cyanobacterium Arthrospira is commercially produced and is a functional, high-value, health food. We identified 5 low temperature and low light intensity tolerant strains of Arthrospira sp. (GMPA1, GMPA7, GMPB1, GMPC1, and GMPC3) using ethyl methanesulfonate mutagenesis and low temperature screening. The 5 Arthrospira strains grew rapidly below 14 °C, 43.75 μmol photons m −2 s −1 and performed breed conservation at 2.5 °C, 8.75 μmol photons m −2 s −1 . We used morphological identification and molecular genetic analysis to identify GMPA1, GMPA7, GMPB1 and GMPC1 as Arthrospira platensis , while GMPC3 was identified as Arthrospira maxima . Growth at different culture temperatures was determined at regular intervals using dry biomass. At 16 °C and 43.75 μmol photons m −2 s −1 , the maximum dry biomass production and the mean dry biomass productivity of GMPA1, GMPB1, and GMPC1 were 2057 ± 80 mg l −1 , 68.7 ± 2.5 mg l −1 day −1 , 1839 ± 44 mg l −1 , 60.6 ± 1.8 mg l −1 day −1 , and 2113 ± 64 mg l −1 , 77.7 ± 2.5 mg l −1 day −1 respectively. GMPB1 was chosen for additional low temperature tolerance studies and growth temperature preference. In winter, GMPB1 grew well at mean temperatures <10 °C, achieving 3258 mg dry biomass from a starting 68 mg. In summer, GMPB1 grew rapidly at mean temperatures more than 28 °C, achieving 1140 mg l −1 dry biomass from a starting 240 mg. Phytonutrient analysis of GMPB1 showed high levels of C-phycocyanin and carotenoids. Arthrospira metabolism relates to terpenoids, and the methyl- d -erythritol 4-phosphate pathway is the only terpenoid biosynthetic pathway in Cyanobacteria. The 1-deoxy- d -xylulose 5-phosphate reductoisomerase (DXR) gene from GMPB1 was cloned and phylogenetic analysis showed that GMPB1 is closest to the Cyanobacterium Oscillatoria nigro-viridis PCC711. Low temperature tolerant Arthrospira strains could broaden the areas suitable for cultivation, extend the seasonal cultivation time, and lower production costs.
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JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION
·
2017
·Vol. 38
·期 1
·30-36
·
IF 0.938
Sun W. Z.,Cheng J. G.,Huang Z. K.,Jiang Y.,Wu L. E.,Liu L. M.
The present work determined the phase relations in Si-Al-M-O-C (M = Zr, Mg) systems, involving SiC-Al 2 O 3 -ZrO 2 , SiC-Al 2 O 3 -MgO, SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO systems by XRD phase analyses of the solid-state reacted samples from powder mixtures of SiC, Al 2 O 3 , ZrO 2 , MgO and SiO 2 . Within these systems, SiC was respectively compatible with other neighboring phases, forming a set of four-phase compatibility tetrahedrons. The subsolidus phase diagrams of the SiC-SiO 2 -Al 2 O 3 -ZrO 2 and SiC-SiO 2 -Al 2 O 3 -MgO quaternary systems were presented.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 1
·150-154
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IF 1.024
Jiang Yuhang,Li Yao,Wang Xuesong,Piao Linglan,Shi Zuosen,Cui Zhanchen
A new and effective organic-inorganic hybrid hydrophilic anti-fog coating was proposed and prepared. As is well-known, the presence of an inorganic component typically decreases the hydrophilicity and transparency of the coating. To solve this problem, we used polyethylene glycol with two different molecular weights to modify the si-lane coupling agent and mixed it with hydrophilic copolymer to form coating formulas. We coated these formulas on polycarbonate(PC) substrates to measure the anti-fogging properties via contact angle and anti-fogging tests, com-pared their transparency properties using UV-Vis spectra and evaluated the hardness using a pencil hardness tester. The results demonstrate that the molecular weight of PEG has a strong influence on the properties of the anti-fog coatings. After the corresponding optimization, we manufactured an excellent anti-fog coating. In addition to good adhesion and hardness, the coating also exhibited excellent mechanical properties, optical transparency and perfect anti-fogging performance.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 23
·期 19
·19409-19416
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IF 2.76
Peng Guilong,He Qiang,Lu Ying,Mmereki Daniel,Zhong Zhihui
A simple method based on dispersive solid-phase extraction (DSPE) and dispersive liquid–liquid microextraction method based on solidification of floating organic droplets (DLLME-SFO) was developed for the extraction of chlorpyrifos (CP), chlorpyrifos-methyl (CPM), and their main degradation product 3,5,6-trichloro-2-pyridinol (TCP) in tomato and cucumber samples. The determination was carried out by high performance liquid chromatography with ultraviolet detection (HPLC-UV). In the DSPE-DLLME-SFO, the analytes were first extracted with acetone. The clean-up of the extract by DSPE was carried out by directly adding activated carbon sorbent into the extract solution, followed by shaking and filtration. Under the optimum conditions, the proposed method was sensitive and showed a good linearity within a range of 2–500 ng/g, with the correlation coefficients ( r ) varying from 0.9991 to 0.9996. The enrichment factors ranged from 127 to 138. The limit of detections (LODs) were in the range of 0.12–0.68 ng/g, and the relative standard deviations (RSDs) for 50 ng/g of each analytes in tomato samples were in the range of 3.25–6.26 % ( n = 5). The proposed method was successfully applied for the extraction and determination of the mentioned analytes residues in tomato and cucumber samples, and satisfactory results were obtained.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 11
·11541-11547
·
IF 1.798
Liu Hongdong,Hu Zhongli,Ruan Haibo,Hu Rong,Su Yongyao,Zhang Lei,Zhang Jin
Owing to the high reversible capacity, low-cost, natural abundance and environmental friendliness, manganese dioxide (MnO 2 ) is recognized as one of the most appropriate and promising anode materials. In this work, nanostructured MnO 2 anode materials have been achieved via a hydrothermal method. The crystal structure, morphology and specific surface area of as-prepared MnO 2 are characterized by XRD, SEM and BET techniques. As anode materials for lithium-ion batteries, MnO 2 samples show high initial discharge capacity and relatively excellent cyclic performance. The electrochemical performance of MnO 2 samples is related to crystal structure and surface morphology. Monoclinic structure, it is similar to graphene, which is more convenient for the fast ionic transportation into the bulk of the electrode materials. And porous structure, which can accommodate volume expansion, shorten the electron and lithium ion diffusion pathway and provide a large number of electrochemical reactive sites for lithium ion insertion and extraction during cycling.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2016
·Vol. 26
·期 5
·1101-1106
·
IF 1.308
Wang Xiaoshuo Wu Pengfei,Lu Siyuan Xu Pengpeng
A new copper coordination polymer, [Cu 2 L 4 (H 2 O) 2 ] n ( 1 ), (HL = 3-(pyridine-2-yl)benzoic acid) has been solvothermally synthesized by using the HL and CuCl 2 ⋅2H 2 O and characterized by IR spectra, elemental analysis, single-crystal and powder X-ray diffractions, and TGA. Compound 1 contains a well-known paddle-wheel unit [Cu 2 (COO) 4 ], which is connected to a three-dimensional supramolecular structure with pcu topology through the hydrogen bond interactions. Compound 1 displays considerable thermal stability and exhibits selective absorption in the visible region, which is shown by thermogravimetric analysis and solid-state UV–Vis diffuse-reflectance spectra, respectively. In addition, compound 1 represents an example of visible light driven photocatalyst based on coordination polymer and shows good degradation ability over Rhodamine B (RhB).
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