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Materials chemistry and physics 65건

  1. [해외논문]   Non-resonant enhancement mechanism in SERS effect due to copper oxide quantum dots stabilized in synthetic zeolite F9-NaX  

    Martinez-Nuñ (Centro de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Son, Mexico ) , ez, C.E. (Centro de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Son, Mexico ) , Delgado-Beleñ (CONACYT - Departamento de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Son, Mexico ) , o, Y. (Centro de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Son, Mexico ) , Cortez-Valadez, M. (Centro de Investigación en Física, Universidad de Sonora, Apdo. Postal 5-88, 83190, Hermosillo, Son, Mexico ) , Flores-Ló (Universidad Nacional Autónoma de México, Centro de Nanociencias y Nanotecnología (CNyN), Departamento de Nanocatálisis, Carretera Tijuana-Ensenada, Km. 107, Ensenada, Baja California, Mexico) , pez, N.S. , Flores-Acosta, M. , Castilló , n-Barraza, F.F.
    Materials chemistry and physics v.211 ,pp. 150 - 159 , 2018 , 0254-0584 ,

    초록

    Abstract This study shows the presence of SERS effect caused by the interaction of synthetic zeolite F9-NaX with stabilized CuO quantum dots. The quantum dots synthesized by the ion-exchange properties of the zeolite show a good size distribution, and a spheroidal shape of 4 nm approximately. The simulation of the structural unit of the zeolite (d4r-8T) and small clusters of (CuO) n performed with density functional theory (DFT), allowed to determine the non-resonant effects from the interaction between the zeolite and CuO as the main contribution to SERS effect by the chemical bonding effect (CBE). Quantum dots CuO show good antibacterial activity against Gran positive and Gran negative bacteria. Highlights CuO Quantum Dots stabilized in zeolite A4. Structural properties in CuO-Zeolite functionalization. Surface Enhancement Raman Scattering due CuO Quantum Dots.

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  2. [해외논문]   The effect of surfactant on the structure, composition and magnetic properties of electrodeposited CoNiFe /Cu microwire  

    Mardani, Reza (Malek Ashtar University of Technology (MUT), Shiraz, Iran ) , Asrar, Abdorreza (Malek Ashtar University of Technology (MUT), Shiraz, Iran ) , Ershadifar, Hamid (Chabahar Oceanography Center, Iranian National Institute for Oceanography and Atmospheric Science (INIOAS), Chabahar, Iran)
    Materials chemistry and physics v.211 ,pp. 160 - 167 , 2018 , 0254-0584 ,

    초록

    Abstract In this work, the constant current electrodeposition of a ternary CoNiFe alloy onto a copper microwire from borate baths containing three surfactant additives was compared. The additives were sodium dodecyl sulfate (SDS) as an anionic surfactant, Triton X-100 as a nonionic surfactant, and the ionic liquid (IL) 1-dodecyl-3-methylimidazolium chloride) [C 12 mim]Cl(as a cationic surfactant. The scanning electron microscopy of the film surfaces showed that the coatings are compact and crack-free, but morphological differences were observed. The films prepared in the IL under optimized experimental conditions showed mechanical stability, high saturation magnetization (79 emu/g), and a GMI ratio of 183.4% at 1.5 MHz, which make them promising candidates for soft magnetic applications. The effect of current density, pH, IL concentration, and metal ion concentration on the current efficiency and the alloy composition was systematically investigated. Anomalous co-deposition under a current density of 29 mA/cm 2 and pH of 2.5 in the presence of 1.2 g/L IL for a deposition time of 120 min lead to 30 μm thick Co 17 Ni 53 Fe 30 alloy coatings with a nanocrystalline/amorphous structure. Highlights Investigating the electrodeposition of alloy coatings from the baths containing different additives. Obtaining the compact, uniform and crack free FeNiCo alloy coatings in the bath containing Ionic Liquid. The high saturation magnetization of 79 emu/g for Co 17 Ni 53 Fe 30 /Cu microwire. The relatively high GMI ratio of 183.4% without any complicated pretreatment.

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  3. [해외논문]   Direct synthesis of ZnO nanorods from solution under electric field  

    Qi, Jianquan (Corresponding author.) , Chang, Juanxiong , Han, Xiumei , Zhong, Ruixia , Jiang, Maocheng , Chen, Zening , Liu, Binde
    Materials chemistry and physics v.211 ,pp. 168 - 171 , 2018 , 0254-0584 ,

    초록

    Abstract In this study, the different morphologies of ZnO nanostructures were directly synthesized from solution by the titration of the solution of Zn(Ac) 2 ·H 2 O into the dilute solution of NaOH at 80 °C under the electric field of 0–0.5 kV cm −1 . The nanorods with the length above 2 μm and the 40 nm in diameter were obtained under the electric field of 0.5 kV cm −1 , whereas the rice-liked nanoparticles with the grain size ∼40 nm were obtained without electric field. Therefore, the morphologies of ZnO can be changed by a high electric field during synthesis. The study provides a new approach to ZnO nanorods from solution near room temperature. Any surfactants and additives are not necessary and thus the unintentional impurities are avoided to simplify the crystallization processing of ZnO nanorods. Highlights Develop a new approach to long nanorods of ZnO under electric field. Synthesis is a simple, high efficient and environment-friendly. Crystallization mechanism under electric field is erected. The conventional synthesis from solution is compared. Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   Effects of deposition temperature on the structural and optical properties of single crystalline rutile TiO2 films  

    Wang, Weiguang (Corresponding author. ) , Wang, Mingxian (Corresponding author.) , Feng, Xianjin , Zhao, Wei , Luan, Caina , Ma, Jin
    Materials chemistry and physics v.211 ,pp. 172 - 176 , 2018 , 0254-0584 ,

    초록

    Abstract Rutile phase titanium dioxide (TiO 2 ) thin films were grown on α-Al 2 O 3 (100) substrates at different deposition temperatures (500–650 °C) by the metalorganic chemical vapor deposition method. The analyses of X-ray diffraction θ -2 θ scan indicated that the deposition temperature had an obvious influence on the crystal quality of the TiO 2 films. Single crystalline rutile TiO 2 films can be obtained from a relatively low deposition temperature of 500 °C–600 °C, and the film grown at 550 °C exhibited the best crystallinity, for which the composition and epitaxial relationship were identified. The effects of deposition temperature on the deposition rate and optical properties of the films have been investigated in detail. Highlights Epitaxial rutile TiO 2 films have been prepared on sapphire substrates by MOCVD. Effects of deposition temperature on film properties were investigated. The average transmittances of the samples in the visible range exceeded 79%. Graphical abstract [DISPLAY OMISSION]

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  5. [해외논문]   Synthesis and characterization of pyrene modified polyethylenimine as a novel fluorescent self-reporter for gene condensation  

    Wang, Yi (Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China ) , Zhong, Yuan (Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China ) , Luo, Li (Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China ) , Li, Xiuhua (Changzhou Institute of Engineering Technology, Changzhou, 213164, China ) , Yin, Tieying (Key Laboratory for Biorheological Science and Technology of Ministry of Education, State and Local Joint Engineering Laboratory for Vascular Implants, Bioengineering College of Chongqing University, Chongqing, 400030, China ) , Huang, Junli (Key Laboratory for Bio) , Zhang, Xiaojuan , Wu, Wei , Wang, Guixue
    Materials chemistry and physics v.211 ,pp. 177 - 180 , 2018 , 0254-0584 ,

    초록

    Abstract The appropriate composite ratio of cationic polymer and gene is fundamental but paramount determinant for efficient gene condensation. In this study, we proposed to construct a novel strategy to comprehensively understand gene condensation situation by using the pyrene (Py) modified polyethylenimine as fluorescent self-reporter, owing to the unique monomer and excimer fluorescence of Py groups highly depending on their intermolecular interval. Constant with the traditional measurements for polymer-gene complex including gel retardation analysis, DLS, ζ-potential, and TEM, the typical curve of fluorescence intensity ratio at I 380 / I 490 was verified to easily have an insight into the gene condensing process, and further recommend the appropriate range of N/P ratio (the ratios of moles of the amine groups of cationic polymers to those of the phosphate ones of DNA) for enhancing gene delivery. Thus, the facilely fabricated fluorescigenic cationic polymer based on an unique excimer-monomer switch could be used as an novel fluorescent self-reporter for comprehensively discerning the gene condensation, which may provide a feasible way to improving the optimal gene encapsulation for efficient and safe gene delivery. Highlights PEI-Py was used as a fluorescent self-reporter to understand the gene condensation situation. The fluorescence analysis of PEI-Py/pp53 could detect the gene condensing process. PEI-Py could be a novel fluorescent self-reporter to improving the optimal gene condensation. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Near UV excited SrAl2O4:Dy3+ phosphors for white LED applications  

    Jamalaiah, Bungala Chinna (Department of Physics, Rajeev Gandhi Memorial College of Engineering & Technology, Nandyal, 518501, India ) , Ramesh Babu, Yagateela (Department of Humanities & Basic Sciences, G. Pulla Reddy Engineering College, Kurnool, 518007, India)
    Materials chemistry and physics v.211 ,pp. 181 - 191 , 2018 , 0254-0584 ,

    초록

    Abstract Strontium aluminate phosphors containing different concentrations of Dy 3+ ions (SrAl 2 O 4 :Dy 3+ ) were prepared by solid state reaction method by sintering at 1100 °C for 3 h. These phosphors were crystallized into monoclinic structure and well consistent with the JCPDS No. 34−0379. All these phosphors exhibit the characteristic emission transitions such as 4 F 9/2 → 6 H 15/2 , 4 F 9/2 → 6 H 13/2 and 4 F 9/2 → 6 H 11/2 corresponding to blue (∼480 nm), yellow (∼572 nm) and red (∼663 nm) regions when excited at 350 nm near UV wavelength. Beyond 1.0 mol% concentration of Dy 3+ ions, a luminescence quenching was noticed and it has been assigned to the energy transfer through dipole-dipole interactions at higher concentrations. Due to crystallization into nanophase, the SrAl 2 O 4 :Dy 3+ phosphors exhibit novel and excellent luminescence properties at 350 nm excitation. The 1.0 mol% of Dy 3+ -doped SrAl 2 O 4 phosphor show a quantum yield of ∼9.52%. The experimental results suggest that the SrAl 2 O 4 :1.0 mol% Dy 3+ phosphor could be the best choice to design white LEDs with bright and intense luminescence. Highlights SrAl 2 O 4 :Dy 3+ phosphors were crystallized into monoclinic structure. Upon 350 nm excitation, the SrAl 2 O 4 :Dy 3+ phosphors exhibit intense luminescence. The dipole-dipole interaction mechanism is responsible for luminescence quenching. The SrAl 2 O 4 :1.0 mol% Dy 3+ phosphor is the best choice to design white LEDs. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   Methane storage capacity of carbon fullerenes and their mechanical and electronic properties: Experimental and theoretical study  

    Mohajeri, R. (Nanotechnology Research Institute, School of Chemical Engineering, Babol University of Technology, Babol, Iran ) , Jahanshahi, M. (Nanotechnology Research Institute, School of Chemical Engineering, Babol University of Technology, Babol, Iran ) , Ahangari, M. Ghorbanzadeh (Department of Mechanical Engineering, Faculty of Engineering and Technology, University of Mazandaran, Babolsar, Iran)
    Materials chemistry and physics v.211 ,pp. 192 - 199 , 2018 , 0254-0584 ,

    초록

    Abstract The storage capacity of carbon fullerenes with confined methane molecules was investigated by means of DFT. Based on our calculations; C 60 and C 84 fullerenes with one methane molecule can form a stable complex. The binding energy of C 60 @1CH 4 and C 84 @1CH 4 was negative and equals to-0.638 eV and −0.5593 eV, respectively. C 180 with twelve confined methane molecules has a stable structure. However, C 180 tends to store just six methane molecules and the binding energy for the 6CH 4 @C 180 complex was minimal (−0.256 eV). Regarding obtained results on the electronic properties, the values of the energy gap for 1CH 4 @C 60 , 1CH 4 @C 84 and 6CH 4 @C 180 complexes were 1.1 eV, 0.87 eV and 0.94 eV, respectively. We have also studied the mechanical properties of C 60 , C 84 , 1CH 4 @C 60 and 6CH 4 @C 180 by the use of DFT and experimental procedure. Moreover, the stability of 1CH 4 @C 60 and 6CH 4 @C 180 complexes was studied in the temperature range between 300 K and 1200 K. We found that the complex structures were slightly distorted and the values of Young's modulus of them with increasing in the temperature value decreased significantly. Highlights DFT study on methane storage capacity of carbon fullerenes. The effect of fullerene diameter was investigated. Mechanical properties was investigated using DFT calculation and AFM analysis. Three different temperature was selected to examine the trend of Young's modulus.

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  8. [해외논문]   Understanding impacts of environmental relative humidity to the cell performance based on LiNi0.8Co0.15Al0.05O2 cathode  

    Lin, Yilong (School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China ) , Xu, Mengqing (School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China ) , Tian, YuanYuan (School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China ) , Fan, Weizhen (GuangZhou Tinci Materials Technology Co. Ltd., China ) , Yu, Le (GuangZhou Tinci Materials Technology Co. Ltd., China ) , Li, Weishan (School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China)
    Materials chemistry and physics v.211 ,pp. 200 - 205 , 2018 , 0254-0584 ,

    초록

    Abstract Impacts of environmental relative humidity (RH) on lithium nickel-cobalt-aluminum oxide (LiNi 0.8 Co 0.15 Al 0.05 O 2 ) based cell performance is investigated. LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA) cathode electrodes are prepared in different environmental relative humidity (RH), 20% RH, 40% RH and 60% RH, respectively. Significant impact of the environmental RH on the cell discharge and coulombic efficiency is observed, specifically, 179.1, 175, and 159.5 mAh/g with the relative humidity, 20% RH, 40% RH and 60% RH, respectively; and corresponding first Coulombic efficiency is 84.9%, 82.2%, and 80.1%. However, the cycling stability of LiNi 0.8 Co 0.15 Al 0.05 O 2 cathode is similar regardless of the environmental RH content. To understand the root cause for the disparity on initial discharge capacity and first Coulombic efficiency, local surface morphology/chemistry of the NCA cathode prepared at different environmental RH has been characterized via multiple advanced techniques, including: SEM, XRD, and XPS. Severe electrolyte decomposition and microstructure changes are seen in the cathode prepared at high moisture content after the first cycle. The severe electrolyte decomposition on the cathode surface and structural degradation of the cathode particles is attributed to the high humidity content. This is believed to be the source of the poor electrochemical performance of NCA cathode. Therefore, environmentally RH control is a critical factor to yield superior electrochemical performance for NCA during electrode processing. Highlights Impact of environmental relative humidity on NCA based cell performance is investigated. Higher environmental relative humidity impacts first discharge capacity and coulombic efficiency. Higher environmental relative humidity has negligible impact on cycling stability of NCA cathode.

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  9. [해외논문]   The thermodynamic, electronic and optical properties of GeP type ZnO under pressure calculated by Debye model and hybrid function  

    Wang, Qingbo (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, PR China ) , Li, Tieping (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, PR China ) , Wang, Hongjuan (College of Mechanical and Electrical Engineering, Nanyang Normal University, Nanyang 473061, PR China ) , Li, Huayang (College of Mechanical and Electrical Engineering, Nanyang Normal University, Nanyang 473061, PR China ) , Miao, Yurun (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, PR China ) , Chen, Qili (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, PR China ) , Wan, Miao (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, PR China ) , Chen, Ling (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, PR China ) , Sun, Jian (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430074, PR China ) , He, Kaihua (School of Mathematics and Physics, China University of Geosciences (Wuhan), Wuhan 430) , Zheng, Guang
    Materials chemistry and physics v.211 ,pp. 206 - 213 , 2018 , 0254-0584 ,

    초록

    Abstract We used the quasi-harmonic Debye model and hybrid function (HSE) to calculate the thermal, electronic and optical properties of GeP type ZnO. The GeP type ZnO has been predicted by theory recently. HSE method is suited for the strongly correlated ZnO. Our calculated enthalpies show wurtzite type (B4) transforms to GeP type at 8.8 GPa. We calculated bands of GeP type ZnO under pressure and used an equation to fit the relation between band gaps and pressure. The electronic density of states (DOS) of B4, GeP and B1 type ZnO under pressure were calculated. And relations between DOS and bands have been discussed. The imaginary part ( ε 2 ( ω )) of the dielectric function shows the GeP type ZnO can be used in the ultraviolet region. From the real part ε 1 ( ω ) of the dielectric function, GeP type ZnO exhibits metallic character around 23.0 eV. Metallic behavior should be notice in the future applications. With increasing pressure, the optical properties shift to higher energy (blue shift), which can be used to evaluate pressure after calibration. We took the absorption coefficient ( α ( ω )) as an example and used an equation to fit the relation between α ( ω ) and pressure. The equations about bandgap and α ( ω ) with pressure can be used to evaluate pressure after calibration. Our paper provides a reference for the applications of GeP type ZnO in the future. Highlights Debye model was used to get thermodynamic properties of GeP type ZnO. HSE was used to get band and optical properties of GeP type ZnO. Pressure induces a blue shift in recent predicted GeP phase ZnO. Equations were used to fit the relation between band gap, α ( ω ) and pressure. We paved roads in applying GeP type ZnO in geophysics and material science.

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  10. [해외논문]   1.5 V Symmetric supercapacitor device based on hydrothermally synthesized Carbon nanotubes and Cobalt Tungstate nanocomposite electrodes  

    Lokhande, Vaibhav (Laboratory of Semiconductor Device Research, Department of Electronics and Computer Engineering, Chonnam National University, Gwangju 61186, South Korea ) , Lee, Seung Jin (Laboratory of Semiconductor Device Research, Department of Electronics and Computer Engineering, Chonnam National University, Gwangju 61186, South Korea ) , Lokhande, Abhishek (Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju 61186, South Korea ) , Kim, Jin Hyeok (Department of Materials Science and Engineering and Optoelectronics Convergence Research Center, Chonnam National University, Gwangju 61186, South Korea ) , Ji, Taeksoo (Laboratory of Semiconductor Device Research, Department of Electronics and Computer Engineering, Chonnam National University, Gwangju 61186, South Korea)
    Materials chemistry and physics v.211 ,pp. 214 - 224 , 2018 , 0254-0584 ,

    초록

    Abstract This study reports the hydrothermal synthesis and electrochemical performance of Cobalt Tungstate (CoWO 4 ) and Carbon nanotubes and Cobalt Tungstate nanocomposite (CNT-CoWO 4 ) as supercapacitor electrode material. The active materials are directly deposited on carbon cloth substrates to fabricate binder free electrodes which exhibited specific capacitance of 1443 F g -1 and 1486 Fg -1 at 5 mVs −1 scan rate for CoWO 4 and CNT-CoWO 4 samples, respectively. As a result of increase in potential window (1 V for nanocomposite CNT-CoWO 4 as compared to 0.6 V for CoWO 4 ) and higher specific capacitance in three electrode system, CNT-CoWO 4 electrode delivers higher energy density than the CoWO 4 electrode. A symmetric capacitor is fabricated from CNT-CoWO 4 nanocomposite electrodes. The performance of symmetric capacitor, operated within a potential window of 1.5 V, is comparable to the asymmetric devices. Furthermore, the device delivered maximum energy density of 12 W h kg −1 at 432 W kg-1 power density. Highlights Hydrothermal deposition of CoWO 4 and CNT-CoWO 4 nanocomposite on carbon cloth substrate. Substantial increase in specific capacitance from the previously reported values. Highest till date. Increase in potential window of the electrode from 0.6 V (CoWO 4 ) to 1 V (CNT-CoWO 4 ). Fabrication of symmetric device exhibiting a potential window of 1.5 V.

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