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Materials chemistry and physics 65건

  1. [해외논문]   The effect of boron and zirconium on wrought structure and γ-γ′ lattice misfit characterization in nickel-based superalloy ATI 718Plus  

    Hosseini, Seyed Ali (Metallic Materials Research Center, Malek Ashtar University of Technology (MUT), Tehran, Iran ) , Abbasi, Seyed Mehdi (Metallic Materials Research Center, Malek Ashtar University of Technology (MUT), Tehran, Iran ) , Madar, Karim Zangeneh (Metallic Materials Research Center, Malek Ashtar University of Technology (MUT), Tehran, Iran ) , Yazdi, Hossein Mohammad Karimi (Department of Materials Engineering, Karaj Branch, Islamic Azad University, Alborz, Iran)
    Materials chemistry and physics v.211 ,pp. 302 - 311 , 2018 , 0254-0584 ,

    초록

    Abstract The effects of boron and zirconium additives on the wrought structural characteristics of the nickel-based superalloy ATI 718Plus, including grain size, delta and γ′ phases, and γ-γ′ misfit were investigated. For this purpose, five alloys with different contents of boron (0.00–0.016 wt%) and zirconium (0.0–0.1 wt%) were cast via the VIM and then purified via the VAR. After the rolling process and the heat treatment cycles, the microstructural investigation by OM, FESEM-EDS and phase analysis by the XRD analysis was performed. Although the results indicated that boron and zirconium had a slight effect on the reduction of grain size, delta phase was increased by 41% and 50% in the presence of these elements, respectively. In fact, boron and zirconium decreased in time and increased the temperature of delta phase nucleation by shifting the nose of the TTP diagram obtained for that to the upper left. The XRD analysis results revealed an increase in the lattice constant of the γ and γ′ phases as well as constrained and unconstrained lattice misfit of them in the presence of boron and zirconium. The maximum γ-γ′ misfit was determined for the alloy with the maximum boron and zirconium content (16 B100Z) as −0.3424 (constrained) and −0.9821 (unconstrained). In addition, the coherent elastic strain between γ and γ′ phases, increased to a higher positive value in the presence of these elements. Highlights The effects of boron and zirconium on the wrought structure of the alloy 718Plus were studied. Boron and zirconium have increased the amount of the delta phase on grain boundaries. The lattice misfit and elastic strain between the γ and γ′ phases increased in the presence of boron and zirconium.

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  2. [해외논문]   Electrochromic behavior of drop-casted thin films combining a semi-conducting polymer mixed with a Keggin-type polyoxometalate  

    Banet, Philippe (LPPI, Université) , Simonnet-Jé (de Cergy-Pontoise, 5 mail Gay Lussac, Neuville sur Oise, 95031, Cergy-Pontoise Cedex, France ) , gat, Corine (Institut Lavoisier de Versailles, UMR 8180 CNRS, Université) , Goubard, Fabrice (de Versailles Saint-Quentin en Yvelines, 45 Avenue des Etats-Unis, 78035, Versailles, Cedex, France ) , Peralta, Sebastien (LPPI, Université) , Lalevé (de Cergy-Pontoise, 5 mail Gay Lussac, Neuville sur Oise, 95031, Cergy-Pontoise Cedex, France ) , e, Jacques (LPPI, Université) , Gigmes, Didier (de Cergy-Pontoise, 5 mail Gay Lussac, Neuville sur Oise, 95031, Cergy-Pontoise Cedex, France ) , Dumur, Fré (Institut de Science des Matériaux de Mulhouse IS2M, UMR 7361 CNRS, Université) , dé (de Haute Alsace, 15 Rue Jean Starcky, 68057, Mulhouse, Cedex, France ) , ric (Aix Marseille Univ, CNRS, ICR, UMR 7273, F-13397, Marseille, France )
    Materials chemistry and physics v.211 ,pp. 312 - 320 , 2018 , 0254-0584 ,

    초록

    Abstract A drop-casted thin film consisting of a Keggin-type polyoxometalate cluster K 3 PMo 12 O 40 mixed with the semi-conducting poly( N -vinylcarbazole) (PVK) was deposited on top of ITO substrates. The resulting hybrid organic/inorganic film was characterized by electrochemistry, FT-IR spectroscopy, microscopies and spectroelectrochemistry. Interestingly, an electrochromic behavior could be evidenced from the resulting composite. Highlights A polyoxometalate has been incorporated into a polymer. An electrochromic behavior has been evidenced. An hybrid organic/inorganic film has been prepared with PVK. Electrochromism has been characterized by spectroelectrochemistry. Graphical abstract [DISPLAY OMISSION]

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  3. [해외논문]   Synthesis and transport properties of p-type lead-free AgSn m SbSe2Te m thermoelectric systems  

    Figueroa-Millon, Sebastiá (Departamento de Química, Facultad de Ciencias, Universidad de Chile, Santiago, Chile ) , n (Departamento de Química Inorgánica I, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain ) , Á (SP2M –) , lvarez-Serrano, Inmaculada (ICMMO (UMR CNRS 8182), Univ. Paris-Sud, Univ. Paris-Saclay, F-91405, Orsay, France ) , Bé (Departamento de Química, Facultad de Ciencias, Universidad de Chile, Santiago, Chile) , rardan, David , Galdá , mez, Antonio
    Materials chemistry and physics v.211 ,pp. 321 - 328 , 2018 , 0254-0584 ,

    초록

    Abstract We report the synthesis, characterization and thermoelectric properties of lead-free AgSn m SbSe 2 Te m ( m = 2 and 10) systems. Powder X-ray diffraction patterns and Rietveld refinement results were consistent with phases belonging to the P m 3 ¯ m space group. The microstructures and morphologies of these systems were investigated using scanning electron microcopy (SEM) and high-resolution transmission electron microscopy (HRTEM). Parallelepiped bars for transport measurements were prepared using two methods: the classical method (CM) from melted samples and the spark plasma sintering (SPS). The AgSn m SbSe 2 Te m ( m = 2 and 10) systems exhibited typical degenerate semiconductor behavior, with a carrier concentration of approximately +10 21 cm −3 . We determined that the Seebeck coefficient can be substantially increased from approximately +40 μV K −1 (CM) to +70 μV K −1 (SPS) in AgSn 2 SbSe 2 Te 2 at room temperature. Consequently, the power factor ( S 2 σ ) was ∼22 μW cm −1 K −2 . On the basis of the electrical and thermal transport properties, ZT values of ∼0.10 were obtained at room temperature. Highlights p -type AgSn m SbSe 2 Te m systems exhibit typical degenerate semiconductor behavior. The maximum S 2 σ value of 22 μW cm −1 K −2 was obtained for AgSn 2 SbSe 2 Te 2 SPSed-sample. ZT values of ∼0.10 were obtained at room temperature. κ latt of AgSn m SbSe 2 Te m systems was ∼0.6 W m −1 K −1 . Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   Influences of surface polarity and Pd ion implantation on the wettability of Al-12Si(-2 Mg)/SiC systems  

    Huang, Zhikun (School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China ) , Liu, Huan (School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China ) , Liu, Guiwu (School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China ) , Wang, Tingting (School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China ) , Zhang, Xiangzhao (School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China ) , Wu, Jian (School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China ) , Wan, Yiguo (Daqo Group Co., Ltd, Zhenjiang, 212013, China ) , Qiao, Guanjun (School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, China)
    Materials chemistry and physics v.211 ,pp. 329 - 334 , 2018 , 0254-0584 ,

    초록

    Abstract N-type 6H-SiC (0001) single crystals were implanted with 20 keV Pd ions at three doses of 5 × 10 15 , 5 × 10 16 and 5 × 10 17 ions/cm 2 at room temperature. The wetting of SiC single crystal by molten Al-12Si and Al-12Si-2Mg were performed by using the sessile drop method in a high vacuum at 1323 K. The influences of surface polarity and Pd ion implantation on the wettability of Al-12Si(-2 Mg)/SiC systems were investigated. The experimental results showed that the equilibrium contact angles of molten Al-12Si and Al-12Si-2Mg on the C-terminated SiC were respectively lower than those on the Si-terminated SiC, which can be related to the formation of Al 4 C 3 at the interface. The wettability of Al-12Si/C(Si)-terminated SiC systems was improved with the 2 wt% Mg addition due to the decrease of the solid-liquid surface energy ( σ SL ) originated from the enhancement of interfacial interactions. Moreover, the equilibrium contact angles of Al-12Si/C(Si)-terminated SiC systems decreased more or less with the Pd implantation dose increasing, while those of Al-12Si-2Mg/C(Si)-terminated SiC systems gradually increased, which can be mainly attributed to the variation of interfacial interactions of Al-12Si(-Mg)/SiC systems. Highlights The Al-alloy/C-terminated SiC have a better wettability. The 2% Mg can improve the wettability of Al-12Si/SiC system. The wettability of Al-12Si/SiC increased with increasing Pd-implantation dose. The wettability of Al-12Si-2Mg/SiC decreased with the increasing of Pd-implantation dose.

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  5. [해외논문]   Visible-light driven photocatalytic degradation of brilliant green dye based on cobalt tungstate (CoWO4) nanoparticles  

    Taneja, Pankaj (Goswami Ganesh Dutta S.D. College, Sector- 32C, Chandigarh 160032, India ) , Sharma, Shelja (Department of Chemistry and Centre of Advanced Studies, Panjab University, Chandigarh 160014, India ) , Umar, Ahmad (Department of Chemistry, College of Science and Arts, Najran University, P.O.Box-1988, Najran 11001, Saudi Arabia ) , Mehta, Surinder Kumar (Department of Chemistry and Centre of Advanced Studies, Panjab University, Chandigarh 160014, India ) , Ibhadon, Alex O. (Department of Chemical Engineering, School of Engineering, University of Hull, Hull, United Kingdom ) , Kansal, Sushil Kumar (Dr. SS Bhatnagar University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh 160014, India)
    Materials chemistry and physics v.211 ,pp. 335 - 342 , 2018 , 0254-0584 ,

    초록

    Abstract Herein, we report the successful surfactant free synthesis, characterization and visible light driven photocatalytic application of highly crystalline cobalt tungstate (CoWO 4 ) nanoparticles. The synthesized nanoparticles were characterized by several techniques which revealed that CoWO 4 exhibited monoclinic phase of Wolframite structure, possess high crystallinity and grown in very high density. As the tungstate nanomaterials are hardly investigated as visible light responsive photocatalyst for the removal of organic pollutants in aqueous phase, thus, in this paper the photocatalytic efficiency of cobalt tungstate nanoparticles was estimated by monitoring the degradation of brilliant green dye under visible light irradiation. Approximately 94% brilliant green dye was degraded within 120 min of visible light illumination. Hydroxyl radicals were held to be accountable for the excellent photocatalytic performance. The present study offers an innovative approach stating that metal tungstates can also be considered as proficient visible light responsive photocatalysts for the degradation of hazardous organic contaminants from aqueous phase. Highlights Facile hydrothermal synthesis of CoWO 4 nanoparticles. Excellent crystallinity, high purity and optical properties. Exceptional photocatalytic degradation of brilliant green dye. Estimation of hydroxyl radicals in the photocatalytic system. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Structural characterization, material properties and sensor application study of in situ polymerized polypyrrole/silver doped titanium dioxide nanocomposites  

    Ramesan, M.T. (Department of Chemistry, University of Calicut, Calicut University, P.O., 673 635, Kerala, 673 635, India ) , Santhi, V. (Department of Chemistry, University of Calicut, Calicut University, P.O., 673 635, Kerala, 673 635, India ) , Bahuleyan, B.K. (Department of General Studies, Yanbu Industrial College, P. O. Box 30436, Yanbu Industrial City, 41912, Saudi Arabia ) , Al-Maghrabi, M.A. (Department of General Studies, Yanbu Industrial College, P. O. Box 30436, Yanbu Industrial City, 41912, Saudi Arabia)
    Materials chemistry and physics v.211 ,pp. 343 - 354 , 2018 , 0254-0584 ,

    초록

    Abstract Polypyrrole (PPy)/silver doped titanium dioxide (Ag-TiO 2 ) nanocomposites were prepared using simple and inexpensive in situ chemical oxidative polymerisation. The nanocomposites were characterised by Fourier transform infrared (FTIR), UV-Vis spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), alternating current (AC) and direct current (DC) conductivity measurements. Furthermore, the ammonia gas sensing properties of PPy and its nanocomposites were explored thoroughly. The FTIR spectrum confirmed the formation of a polymer nanocomposite when the characteristic bands of the PPy shifted to a lower wavenumber region. The UV-Vis spectrum revealed that all the absorption peaks of the composite were shifted to a higher wavelength in comparison with PPy. The shifts in absorption peaks were due to the strong interfacial interaction between the nanoparticles and polymer chain. SEM images showed that the nanoparticles were well shaped spherical particles with the uniform dispersion in the PPy. XRD results revealed that the crystallinity of the nanocomposite increased with an increase in concentration of nanoparticles. TGA analysis showed that the thermal stability of the nanocomposite was enhanced compared to pure PPy. From the DSC analysis, it was clear that the glass transition temperature of the nanocomposite increased when the concentration of metal oxide nanoparticles was augmented. The fabricated composites showed excellent sensitivity and fast response to ammonia gas at room temperature. The electrical conductivity, dielectric constant and dissipation factor of the nanocomposites significantly increased with an increase in the concentration of metal oxide nanoparticles in the PPy matrix. Highlights Fabrication of PPy/Ag doped TiO 2 nanocomposites by in-situ polymerisation method. Optimized thermal, electrical conductivity and dielectric properties of the nanocomposite. Evaluated the effect of nanoparticles on gas sensing performance. Maximum material property was shown by 10wt % composite.

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  7. [해외논문]   Differences in hydrogen absorption over Pd and Pt functionalized CVD-grown GaN nanowires  

    Prasad, Arun K. (Corresponding author.) , Sahoo, Prasana K. , Dhara, Sandip , Dash, Sitaram , Tyagi, Ashok K.
    Materials chemistry and physics v.211 ,pp. 355 - 360 , 2018 , 0254-0584 ,

    초록

    Abstract In this study, we report the differences in hydrogen (H 2 ) absorption properties of platinum (Pt) and palladium (Pd) functionalized gallium nitride (GaN) nanowires via gas sensing studies. GaN nanowires of ∼ 25 − 200 nm diameter and ∼ 50 − 75 μ m length are grown uniformly over large area (10 × 10 mm 2 ) using Au assisted chemical vapour deposition technique. The nanowires are grown at 900 for 2 h using gallium (Ga) as source material and ammonia (NH 3 ) as the reacting gas. The nanowires are functionalized with Pd and Pt nanoclusters using solution technique. H 2 absorption by these functionalized nanowires which is manifested as gas sensing response is compared in the temperature range of 50–200. The role of surface kinetics in Pd and Pt is shown to be responsible for the difference in the sensor response. Highlights Differences in hydrogen absorption of Pt and Pd surface functionalized on GaN matrix demonstrated through gas sensing. Use of surface functionalized GaN nanowire for hydrogen detection near room temperature. Hydrogen absorption mechanism of GaN-Pt/Pd on lines of Schottky barrier formation shown. Role of surface kinetics in Pd and Pt assisted gas sensing explained. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   EPDM crosslinking from bio-based vegetable oil and Diels–Alder reactions  

    Bé (Corresponding author.) , tron, Cyrille , Cassagnau, Philippe , Bounor-Legaré , , Vé , ronique
    Materials chemistry and physics v.211 ,pp. 361 - 374 , 2018 , 0254-0584 ,

    초록

    Abstract The aim of this work was to study and develop a green process of plasticization and crosslinking of an EPDM matrix with a thiofuran based coupling agent. For this purpose, tung oil, composed of around 80 wt% of α-eleostearic acid, was used as both plasticizer and thermal crosslinker. Due to the low compatibility and weak interactions between vegetable oils and the EPDM matrix, the 2-furanmethanethiol (derived from the food industry) was used as a di-functional compatibilizing agent. The 2-furanmethanethiol was successfully grafted by a thiol–ene reaction onto both the tung oil and the EPDM matrix. The formulation was thermally treated in order to crosslink the EPDM matrix and the tung oil through expected Diels–Alder reaction. The reactions were evidenced by liquid 1 H NMR spectroscopy analysis. The crosslinked sample was characterized by different mechanical tests. The sample properties were also compared with the ones of an EPDM crosslinked by dicumyl peroxide (DCP) and plasticized by mineral oil. Highlights Study of EPDM crosslinked systems based on vegetable oil. Use of thiol-ene and Diels-Alder reactions. Properties comparable to those obtained with peroxide crosslinking system.

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  9. [해외논문]   Two-dimensional coupling: Sb nanoplates embedded in MoS2 nanosheets as efficient anode for advanced sodium ion batteries  

    Li, Chuang (Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, PR China ) , Wei, Guijuan (Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, PR China ) , Wang, Shutao (College of Science and Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, PR China ) , Wang, Zhaojie (College of Science and Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, PR China ) , Liu, Ming (College of Science and Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, PR China ) , Zhang, Jun (College of Science and Chemical Engineering, China University of Petroleum, Qingdao, Shandong 266580, PR China ) , An, Changhua (Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, PR China)
    Materials chemistry and physics v.211 ,pp. 375 - 381 , 2018 , 0254-0584 ,

    초록

    Abstract The development of advanced anode materials is the crucial to the enhanced performance of sodium ion batteries, which is a potential substitute to lithium ion batteries. In this work, two-dimensional coupling nanostructures with Sb nanoplates embedded ultrathin few-layered MoS 2 nanosheets (MoS 2 /Sb) have been synthesized through a one-pot solvothermal method. The assembled sodium battery with the anode of MoS 2 /Sb yields a high reversible capacity of 666 mAh g −1 and 454 mAh g −1 at current densities of 0.1 A g −1 and 10 A g −1 , respectively, demonstrating its good cyclicity and rate performance. The tightly embedded contact between ultrathin MoS 2 nanosheets and Sb nanoplates not only improve the electronic conductivity, but accommodate the volume expansion of metallic Sb and prevent the restacking of few-layer MoS 2 nanosheets. Therefore, the synergetic effects of the two dimensional nanocomponents are responsible for their excellent performance. Highlights A simple strategy was reported to synthesize the MoS 2 /Sb coupling nanostructure as SIBs anode materials. MoS 2 /Sb composite revealed good cyclicity and rate performance. Ex-situ XRD and HRTEM confirmed the reversibility of the conversion reaction between MoS 2 /Sb electrode and Na + ions. Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Improvement performance of two-step electrodepositing Cu2MnSnS4 thin film solar cells by tuning Cu-Sn alloy layer deposition time  

    Yu, Jiejin (Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai, 200241, China ) , Deng, Hongmei (Laboratory for Microstructures, Shanghai University, 99 Shangda Road, Shanghai, 200444, China ) , Chen, Leilei (Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai, 200241, China ) , Tao, Jiahua (Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai, 200241, China ) , Zhang, Qiao (Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai, 200241, China ) , Guo, Benlong (Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of Electronic Engineering, East China Normal University, Shanghai, 200241, China ) , Sun, Lin (Key Laboratory of Polar Materials and Devices, Ministry of Education, Department of) , Yang, Pingxiong , Zheng, Xiaoping , Chu, Junhao
    Materials chemistry and physics v.211 ,pp. 382 - 388 , 2018 , 0254-0584 ,

    초록

    Abstract A green and cost-effective two-step electrodeposition process has been used to prepare earth-abundant Cu 2 MnSnS 4 (CMTS) thin films. We have systematically studied the influence of tuning the deposition time of Cu-Sn alloy layer from 8 to 15 min on the properties of CMTS thin films and the performance of the solar cells. This process increases the content of Cu and Sn, and the thickness of the final CMTS thin films, and further tunes the band gap from 1.43 to 1.35 eV. Moreover, the amount of MnS secondary phase has been reduced, the crystallinity and morphology of the absorber layers has been significantly improved, and eventually the photovoltaic performance has been remarkably enhanced. Nevertheless, a further increase in the deposition time degrades the crystalline quality of the thin films and forms the Cu 2 SnS 3 secondary phase. Particularly, the efficiency of the CMTS thin film solar cells improved nearly tenfold from 0.08% to 0.76% when the Cu-Sn alloy layer deposition time is optimized to 12 min. Notably, this is the highest efficiency for an electrodeposited CMTS solar cell up to now, which offers a promising alternative approach for the preparation of CMTS solar cell devices. Highlights Tuning the Cu-Sn alloy deposition time control well the composition of CMTS films. Various the deposition time affect phase purity and microstructure dramatically. Different thickness of films markedly improves devices photovoltaic performance. These results offers a novel research direction for fabrication of CMTS cells.

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