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저널/프로시딩 상세정보

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Materials chemistry and physics 65건

  1. [해외논문]   Fabrication of a novel Zeolite-X/Reduced graphene oxide/Polypyrrole nanocomposite and its role in sensitive detection of CO  

    Naikoo, Rawoof A. (Corresponding author.) , Tomar, Radha
    Materials chemistry and physics v.211 ,pp. 225 - 233 , 2018 , 0254-0584 ,

    초록

    Abstract The nanocomposite of Zeolite-X/Reduced graphene oxide/Polypyrrole was successfully synthesized and characterized by Fourier Transform-Infrared spectroscopy (FTIR), Powder X-Ray diffraction (XRD), Scanning Electron Microscopy (SEM) and thermo-gravimetric analysis (TGA) for their nature, morphology and thermal stability. The gas sensing studies for the carbon monoxide detection was carried out at the concentrations ranging from 5 ppm to 1000 ppm. The effect of parameters viz. zeolite content, cyclic interval, CO concentration on the response of the nanocomposite towards CO were investigated. A lower value of response time for Na-X/rGO/PPy nanocomposite was found as compared to polypyrrole and Na-X/Polypyrrole composite which can be attributed due to the incorporation of high surface area constituents viz. zeolite and rGO in the Na-X/rGO/PPy nanocomposite. In addition, a lower value of recovery time of Na-X/rGO/PPy was found since rGO forms a layer inside and outside the Zeolite which prevents the permanent association of the CO with the Na ion of Na-Zeolite. The sensitivity value of the Na-X/rGO/PPy nanocomposite increased as the zeolite content was increased. This increase in the response by increasing the zeolite content is attributed due to the increase in the surface area of the composite. Highlights Nanocomposite of Na-X/rGO/PPy was successfully synthesized. Synthesized material was characterized by FTIR, Powder XRD, SEM and TGA. The effect of zeolite content, cyclic interval and CO concentration was investigated.

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  2. [해외논문]   Ultramicroporous carbon nanoparticles derived from metal–organic framework nanoparticles for high-performance supercapacitors  

    Liu, Mingxian (Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China ) , Zhao, Fangle (Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China ) , Zhu, Dazhang (Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China ) , Duan, Hui (Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China ) , Lv, Yaokang (College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, China ) , Li, Liangchun (Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China ) , Gan, Lihua (Shanghai Key Lab of Chemical Assessment and Sustainability, School of Chemical Science and Engineering, Tongji University, Shanghai, 200092, China)
    Materials chemistry and physics v.211 ,pp. 234 - 241 , 2018 , 0254-0584 ,

    초록

    Abstract A novel approach for template-free synthesis of ultramicroporous carbon nanoparticles (UCNs) derived from metal–organic frameworks (MOFs) of UiO 67 is demonstrated. UiO 67 nanocrystals are fabricated via a solvothermal reaction of biphenyl-4,4′-dicarboxylic acid (H 2 bpdc) and zirconium (IV) chloride using benzoic acid as a modulator, and serve simultaneously as a carbon source and a self-template to generate regular ultramicropores during carbonization. The modulator equivalent and carbonization temperature show significant influences on the morphology and pore structure of the resulting UCNs. The simple prepared with 20 equivalents of benzoic acid and carbonized at 750 °C (denoted as UCN-20-750) manifests nanoscale particle size, a high specific surface area of 843 m 2 g −1 and a regular ultramicropore of 0.53 nm, achieving a balance between the conductivity and surface area in the electrode for high performance energy storage. UCN-20-750 as a supercapacitor electrode exhibits a specific capacitance of 256 F g −1 at a current density of 1.0 A g −1 in 6 M KOH aqueous electrolyte. Besides, the electrode shows excellent cycling stability with 91% retention after 10000 cycles at 2.0 A g −1 . The present MOF-derived strategy to synthesize UCNs could be simply and efficiently implemented without any pretreatment, hard/soft template or activation process, and opens up a new window to precisely control the pore size in ultramicropore region for high-performance supercapacitor applications. Highlights Precise control of the pore size of carbon materials in ultramicropore region was achieved. UiO 67 was used as both carbon source and self-template to yield ultramicroporous carbon nanoparticles (UCNs). UCNs have nanoscale particle size, a high specific surface area and regular ultramicropores. UCN electrode has a high specific capacitance and excellent long-term cycle stability. Graphical abstract A simple and novel strategy to achieve precise control of the pore size of carbon materials in ultramicropore region for high-performance supercapacitors was demonstrated. [DISPLAY OMISSION]

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  3. [해외논문]   Study of structural, electronic, optical and thermal properties of refractory material (CrAlB)  

    Rastogi, Anugya (Corresponding author.) , Rajpoot, Priyanka , Verma, U.P.
    Materials chemistry and physics v.211 ,pp. 242 - 248 , 2018 , 0254-0584 ,

    초록

    Abstract The structural, electronic, optical and thermal properties of ternary transition metal boride (CrAlB) are studied using full potential linearized augmented plane wave method in the framework of the density functional theory. The exchange-correlation potential is solved using the modified Perdew-Burke-Ernzerhof generalized gradient approximation (PBEsol-GGA). The structural parameters are optimized to obtain equilibrium lattice constant, bulk modulus and its pressure derivative. The calculated band structure, density of states and electronic charge density show that the material possesses metallic nature and have covalent band character. Optical spectra calculations such as the real and imaginary part of dielectric constant, refractive index, extinction coefficient, reflectivity, absorption coefficient, conductivity, and loss function are performed within the photon energy range of 0–40 eV. In this case the obtained plasma frequency corresponds to 24.12eV. For radiation above this energy the property of CrAlB changes from metallic to dielectric. The calculations of the thermal properties using Gibb's program have been performed in the range 0–5000 K at 0, 20 and 50 GPa of pressure. The studies of optical and thermal properties show that it is an eligible candidate for optoelectronic devices, and the devices working at high temperature. The results for CrAlB are reported for the first time as neither CrAlB has been synthesized nor any theoretical calculation has been performed till so far. Highlights GGA-PBEsol functional is best suited for lattice constants in CrAlB. For CrAlB plasma frequency corresponds to 24.12eV. For radiation >24.12eV, properties of CrAlB changes from metallic to dielectric. CrAlB is useful in devices working at high temperature and in optoelectronic. Graphical abstract Figure. Partial DOS for 3 s and 3 p states of aluminum atom. [DISPLAY OMISSION]

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  4. [해외논문]   Rapid microwave-assisted synthesis of zirconium aluminide  

    Carvalho-Jr, Waldemir. M. (Universidade Federal do ABC, Avenida dos Estados 5001, 09210-580, Santo André, SP, Brazil ) , Souza, Flavio L. (Universidade Federal do ABC, Avenida dos Estados 5001, 09210-580, Santo André, SP, Brazil ) , Santos, Sydney Ferreira (Universidade Federal do ABC, Avenida dos Estados 5001, 09210-580, Santo André, SP, Brazil ) , Bobet, Jean-Louis (Université)
    Materials chemistry and physics v.211 ,pp. 249 - 257 , 2018 , 0254-0584 ,

    초록

    Abstract Here we show a fast and direct zirconium aluminide alloys manufacturing process using the microwave-assisted technique. The rapid microwave-assisted synthesis was performed using two different starting precursors (Zr and ZrH 2 ) revealing the ZrAl 3 phase as the main phase formation, with a small percentage of ZrAl 2 . The phase formation and their percentages were evaluated and confirmed by combining X-ray diffraction and chemical analysis data. In addition, the scanning electron microscopy revealed that the bodies based on ZrH 2 samples showed smaller particle size compared with the Zr ones. This was attributed to the microwave radiation concentration that might lead several dehydrogenation sites to generate a non-homogeneity reducing the particle. These findings provide a novel, rapid and versatile method to design zirconium aluminide alloys according to the desired application by controlling the starting precursors (Zr or ZrH 2 ) and microwave exposure time. Highlights ZrAl alloys were synthetized directly using the microwave-assisted method. Zr/Al or ZrH 2 /Al microwave-assisted treatment provides mainly Al rich phases. ZrH 2 dehydrogenation produces smaller grain size than using Zr as precursor. Graphical abstract [DISPLAY OMISSION]

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  5. [해외논문]   Observation of power-law behavior in temperature dependent conductivity of multiwall carbon nanotube/polystyrene composites  

    Bhatia, Ravi (Department of Physics, Guru Jambheshwar University of Science and Technology, Hisar, 125001, India ) , Sameera, I. (College of Physical Science and Technology, Sichuan University, Chengdu, 610064, China ) , Prasad, V. (Department of Physics, Indian Institute of Science, Bangalore, 560012, India ) , Menon, Reghu (Department of Physics, Indian Institute of Science, Bangalore, 560012, India)
    Materials chemistry and physics v.211 ,pp. 258 - 263 , 2018 , 0254-0584 ,

    초록

    Abstract For last two decades, a pronounced temperature dependence of electrical conductivity ( σ ) in the multiwall carbon nanotube (MWCNT) - based polymer composite (even above the percolation threshold) has been widely reported; the conduction mechanism has been understood by employing conventional models, namely variable range hopping and fluctuation induced tunneling. Herein, we report on the observation of a weak temperature dependence of σ in the MWCNT/polystyrene composites above percolation threshold (0.7–7 wt %) at temperatures down to 1.4 K, with a conductivity ratio smaller than 3. The low temperature conductivity data follow power-law exhibiting two slope behavior, with exponent values β 1 ∼0.10–0.14 (at T > 5 K) and β 2 ∼0.23–0.36 (at T σ is attributed to high aspect ratio (more than 4000), achievement of high degree of dispersion, and excellent electrical properties of MWCNT as well as optimized composite processing. Further, all the samples exhibit negative magnetoresistance which can be explained within the framework of weak localization model. Highlights Temperature dependence of conductivity (300–1.4 K) of MWCNT/PS composites is studied. Conductivity of MWCNT/PS composites exhibit weak temperature dependence. Conductivity ratio ( σ r ) is smaller than 3 for all samples. Power-law explains the conduction mechanism in the low temperature regime. Previous similar measurements resulted a pronounced temperature dependence with σ r ∼500. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Fabrication of ultra-performance non-compact graphene/carbon hollow fibers/graphene stationary junction like membrane for CO2-Capture  

    Elsabawy, Khaled M. (Chemistry Department, Materials Unit, Faculty of Science, Tanta University, Tanta, 31725, Egypt ) , Fallatah, Ahmed M. (Chemistry Department, Faculty of Science, Nano-Structured Materials Gp, Taif University, 888- Alhawya, Taif City, Saudi Arabia)
    Materials chemistry and physics v.211 ,pp. 264 - 269 , 2018 , 0254-0584 ,

    초록

    Abstract Ultra-performance non-compact Graphene/Carbon Hollow Fibers/Graphene ∼(G/CHF/G) junction like membrane was successfully fabricated by chemical vapor deposition (CVD) of graphene on the two sides of carbon fibers pellet of with thickness of 6 mm. Mono-, bi-junction and tri-units junction membranes were loaded in column with specific parameters suitable for junction size. The column was made from special glass with controlled in/outlet stopper. The adsorption capacities of Mono-, bi-junction and tri-units junction like membranes were measured from adsorption isotherm at 25 °C and found to be 76, 93 and 117 mmol. CO 2 /gm G/CHF/G respectively. These promising results are attributable to G/CHF/G junction like membrane has ultra-high surface area coupled with mesoporous structure. Furthermore compactness of graphene layers with thickness average 67.5 A on the surface of carbon hollow fibers act as true membrane reinforced by adsorption on cavities of carbon hollow fibers. Highlights (G/CHF/G) junction was successfully fabricated by chemical vapor deposition (CVD). Mono-, bi-junction and tri-units junction membranes were loaded in column with specific parameters suitable for junction size. The column was made from special glass with controlled in/outlet stopper. The adsorption capacities were 76,93 and 117 mmol. CO 2 /gm G/CHF/G. Graphene layers with thickness average 67.5 A act as true membrane. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   Evidence of hydrogenated carbon in the nanostructure of carbide-derived carbons obtained from hydrochlorination reaction  

    Gonzá (CONACYT - Centro de Ingeniería y Desarrollo Industrial, Av. Pie de la Cuesta No. 702, 76125, Querétaro, Qro, Mexico ) , lez-Garcí (Centro Nacional de Microscopía Electrónica, Universidad Complutense, E-28040, Madrid, Spain ) , a, P. (Centro de Investigación en Micro y Nanotecnología, Universidad Veracruzana, Calzada Ruiz Cortínes No. 455, 94294, Boca del Río, Veracruz, Mexico) , Urones-Garrote, E. , Garcí , a-Gonzá , lez, L.
    Materials chemistry and physics v.211 ,pp. 270 - 277 , 2018 , 0254-0584 ,

    초록

    Abstract Titanium carbide derived carbons were obtained from hydrochlorination reaction at 300, 500, 700 and 900 °C. The effect of the mixture hydrogen/chlorine, as reaction atmosphere, has been analyzed using X-ray diffraction, Fourier transform infrared, Raman and electron energy loss spectroscopies. Infrared spectroscopy showed several bands related to the presence of CH, CH 2 and CH 3 groups, a feature not observed in chlorinated carbide derived carbons. The Raman spectra displayed the classical bands of graphitic materials: D, G, and 2D; however, presence of three bands located at ≈ 680, 838 and 1060 cm −1 , revealed presence of small diamond and diamonoid clusters. In addition, electron energy loss spectroscopy data revealed sp 2 carbon bonding content from 82 to 100% and mass density in the range of 1.4–2.2 g/cm 3 , indicating changes in the carbon hybridization. Finally, transmission electron microscopy analyses showed the evolution in the local nanostructure as result of the thermal treatments. Highlights Titanium carbide derived carbons were obtained from hydrochlorination reaction. Spectroscopy studies provided evidence of formation of sp 3 hybridized carbon. The Raman bands located at ≈ 680, 838 and 1060 cm −1 , revealed diamonoid clusters. Electron energy loss spectroscopy data yield sp 2 carbon bonding from 82 to 100%. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   Cation distribution in CuFe2-xCrxО4 spinels studied by neutron diffraction and its effect on catalytic properties in water gas shift reaction  

    Plyasova, L.M. (Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia ) , Minyukova, T.P. (Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia ) , Yurieva, T.M. (Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia ) , Uyanga, E. (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia ) , Bobrikov, I.A. (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia ) , Zaikovskii, V.I. (Boreskov Institute of Catalysis SB RAS, 630090 Novosibirsk, Russia ) , Balagurov, A.M. (Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980, Dubna, Moscow region, Russia)
    Materials chemistry and physics v.211 ,pp. 278 - 282 , 2018 , 0254-0584 ,

    초록

    Abstract Neutron diffraction was used to determine structural characteristics of a series of CuFe 2-x Cr x O 4 ( х = 0 ÷ 0 ÷ 2) spinels. The range of Fe/Cr ratios ensuring the occurrence of cubic and tetragonal spinel modifications was refined. The distribution of cations between octa- and tetrahedral positions was estimated. A correlation between distribution of the catalytically active Cu 2+ cations in the spinel structure and activation energy of the low-temperature water gas shift reaction was revealed. Highlights The structural characteristics of CuFe 2-x Cr x O 4 spinels were determined by neutron diffraction. The distribution of Cu, Fe, Cr cations with close atomic numbers and the degree of inversion δ was estimated. The effect of the inversion of spinels on the activation energy of LT WGSR is shown. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   A comparison study of the structural, electronic, magnetic and optical properties of yttrium-based Heusler alloys Y3Si, Y2CrSi and ScYCrSi  

    Kang, Xu-Hui (Corresponding author.) , Zhang, Jian-Min
    Materials chemistry and physics v.211 ,pp. 283 - 294 , 2018 , 0254-0584 ,

    초록

    Abstract The structural, electronic, magnetic and optical properties of the yttrium-based binary Heusler alloy Y 3 Si , ternary Heusler alloy Y 2 CrSi and quaternary Heusler alloy ScYCrSi have been studied by first-principles calculations. The results show that the preferred configurations of Y 3 Si , Y 2 CrSi and ScYCrSi alloys are DO 3 - FM , Hg 2 CuTi − FM and YI − FM configurations, respectively. The Y 3 Si alloy is a conventional metal ferromagnet. While the Y 2 CrSi and ScYCrSi alloys are HM ferromagnets with spin-up band gaps of 0.682 eV and 0.862 eV as well as the HM characters are maintained in the lattice constant ranges of 6.365–7.057 A and 6.029–7.129 A, respectively, ensuring potential applications in spintronics. The total magnetic moments of the Y 2 CrSi and ScYCrSi alloys are all 2 μ B /f .u . , satisfying the Slater-Pauling rule M t = 18 18 - Z t . Among three alloys considered, the Y 2 CrSi alloy has the lowest static dielectric constant, static reflective index, static refractive index, global maximum energy loss function but the highest maximum imaginary part. The phonon dispersion spectra show both Y 2 CrSi and ScYCrSi alloys are dynamically stable, while the Y 3 Si alloy is dynamically unstable. Highlights Y 3 Si is metal-FM, while Y 2 CrSi and ScYCrSi are HM-FM. HM-FM natures of Y 2 CrSi and ScYCrSi exist in range 6.365–7.057 A and 6.029–7.129 A. Total moments of Y 2 CrSi and ScYCrSi are 2 μ B /f .u . , satisfying Slater-Pauling rule M t = 18 18 - Z t . The Y 2 CrSi has the lowest ε 1 ( 0 ) , R ( 0 ) , n ( 0 ) , L ( ω ) max but the highest ε 2 ( ω ) max . Y 2 CrSi and ScYCrSi are dynamically stable, while Y 3 Si is dynamically unstable. Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Tunability, ferroelectric and leakage studies on pulsed laser ablated (Pb0.92La0.08)(Zr0.60Ti0.40)O3 thin films  

    James, A.R. (Defence Metallurgical Research Laboratory, Hyderabad, 500058, India ) , Kumar, Ajeet (Defence Metallurgical Research Laboratory, Hyderabad, 500058, India ) , Prasad, V.V. Bhanu (Defence Metallurgical Research Laboratory, Hyderabad, 500058, India ) , Kamat, S.V. (Defence Metallurgical Research Laboratory, Hyderabad, 500058, India ) , Singh, Vajinder (Defence Metallurgical Research Laboratory, Hyderabad, 500058, India ) , Ghoshal, P. (Defence Metallurgical Research Laboratory, Hyderabad, 500058, India ) , Pandey, Akhilesh (Solid State Physics Laboratory, Delhi, 110 054, India)
    Materials chemistry and physics v.211 ,pp. 295 - 301 , 2018 , 0254-0584 ,

    초록

    Abstract (Pb 0.92 La 0.08 )(Zr 0.60 Ti 0.40 )O 3 (PLZT 8/60/40) thin films were fabricated on LNO/Si substrates by using a pulsed laser deposition (PLD) technique and with in-situ crystallization. The kinetics of the subsequent pyrochlore-perovskite crystallization was found to be oxygen pressure dependent in the deposition process. Conditions for obtaining phase pure, perovskite thin films using LaNiO 3 (LNO) as a bottom electrode were optimized. X-ray diffraction measurements showed well-crystallized PLZT 8/60/40 thin films on a layer of LNO which served as both a template to deposit PLZT 8/60/40 on it as well as to use as a conducting bottom electrode. Atomic force microscopy (AFM) image indicates the effect of oxygen background pressure on the morphology of the films and field emission scanning electron microscopy (FE-SEM) images are used to corroborate the same. Voltage dependent capacitance study was used for the measurement of tunability in PLZT 8/60/40 thin film and was found to be 80%. Well saturated polarization vs. electric field (P-E) hysteresis loop with a remnant polarization (P r ) of ∼13.3 μC/cm 2 was observed. Leakage current studies were also done for PLZT 8/60/40 thin films. Highlights LNO layer (bottom electrode) was used as a template to grow PLZT films by PLD. Tunability for PLZT 8/60/40 thin films was found to be 80%. Well saturated P-E hysteresis loop with P r ∼13.3 μCcm −2 and E c ∼121 kV/cm of PLZT film. Leakage studies show the ohmic type conduction in PLZT thin films.

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