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Materials chemistry and physics 65건

  1. [해외논문]   Inside Front Cover Editorial Board  


    Materials chemistry and physics v.211 ,pp. IFC - IFC , 2018 , 0254-0584 ,

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  2. [해외논문]   Inside Front Cover Editorial Board  


    Materials chemistry and physics v.211 ,pp. IFC , 2018 , 0254-0584 ,

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  3. [해외논문]   Prelim III: Contents  


    Materials chemistry and physics v.211 ,pp. iii - vi , 2018 , 0254-0584 ,

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  4. [해외논문]   High piezoelectric properties of modified nano lead titanate zirconate ceramics  

    Tawfik, A. (Corresponding author.) , Hemeda, O.M. , Henaish, A.M.A. , Dorgham, A.M.
    Materials chemistry and physics v.211 ,pp. 1 - 8 , 2018 , 0254-0584 ,

    초록

    Abstract A series of PbZr x Ti 1-x O 3 (x = 0.0, 0.2, 0.4 and 0.8) nanoparticle samples were prepared by tartrate precursor method. Both the piezoelectric modulus d 33 and the grain size increased by increasing zirconium (Zr) content up to x = 0.4 and then decreases for higher content. The coupling factor K p increased also by more doping of Zr up to x = 0.4. The ultrasonic wave velocity decreased with increasing Zr content up to x = 0.4. The piezoelectric modulus d 33 value of nano PbZr 0.4 Ti 0.6 O 3 is suitable for improving application for piezoelectric technology. Highlights The substitution of Zr ions enhance d 33 . The coupling factor K p increase by Zr addition. The ultrasonic velocity decrease by Zr addition.

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  5. [해외논문]   Photon shielding characterizations of bismuth modified borate –silicate–tellurite glasses using MCNPX Monte Carlo code  

    Ozan Tekin, Huseyin (Uskudar University, Vocational School of Health Services, Radiotherapy Department, Istanbul, 34672, Turkey ) , Sayyed, M.I. (Physics Department, University of Tabuk, Tabuk, Saudi Arabia ) , Manici, Tugba (Uskudar University, Medical Radiation Research Center (USMERA), Istanbul, 34672, Turkey ) , Altunsoy, Elif Ebru (Uskudar University, Medical Radiation Research Center (USMERA), Istanbul, 34672, Turkey)
    Materials chemistry and physics v.211 ,pp. 9 - 16 , 2018 , 0254-0584 ,

    초록

    Abstract In this study, the radiation mass attenuation coefficients of different bismuth-borate glass samples as shielding materials are calculated at 356, 662, 1173 and 1332 keV photon energies by using general purpose Monte Carlo code MCNPX (version 2.4.0). The obtained numerical results agreed well with previous experimental, theoretical results and with standard XCOM data. The validated simulation geometry has been used then to investigate the photon attenuation properties of B 2 O 3 –Bi 2 O 3 –SiO 2 –TeO 2 glass system. The photon shielding parameters such as mass attenuation coefficients, effective atomic number, and mean free path have been calculated and the variation in these parameters was discussed in terms of both photon energy and Bi 2 O 3 concentration. The maximum values of mass attenuation coefficients and effective atomic number were found for Bbi7 glass sample. The photon shielding properties for the B 2 O 3 –Bi 2 O 3 –SiO 2 –TeO 2 glasses have been compared in terms of half value layer with some commercially-available shielding glasses developed by SCHOTT company. Also, the mean free path for the present glasses have been compared with those of different glass samples and steel-magnetite concrete. The comparison reveals that the B 2 O 3 –Bi 2 O 3 –SiO 2 –TeO 2 glass system can be used for photon shielding applications. Highlights The addition of Bi 2 O 3 enhances the photon shielding performance of the present glass samples. The B 2 O 3 –Bi 2 O 3 –SiO 2 –TeO 2 glass system can be developed for photon shielding applications. Standard MCNPX geometry and given simulation details can be useful for scientific community.

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  6. [해외논문]   Co-sputtered Cu(Ti) thin alloy film for formation of Cu diffusion and chip-level bonding  

    Lin, Po Chen (Department of Chemical and Materials Engineering, National Central University, Jhongli Dist., Taoyuan City 320, Taiwan ) , Chen, Hao (Department of Chemical and Materials Engineering, National Central University, Jhongli Dist., Taoyuan City 320, Taiwan ) , Hsieh, Hsien-Chien (Department of Chemical and Materials Engineering, National Central University, Jhongli Dist., Taoyuan City 320, Taiwan ) , Tseng, Tsan-Hsien (Department of Chemical and Materials Engineering, National Central University, Jhongli Dist., Taoyuan City 320, Taiwan ) , Lee, Hsin Yi (National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 300, Taiwan ) , Wu, Albert T. (Department of Chemical and Materials Engineering, National Central University, Jhongli Dist., Taoyuan City 320, Taiwan)
    Materials chemistry and physics v.211 ,pp. 17 - 22 , 2018 , 0254-0584 ,

    초록

    Abstract Co-sputtered Cu(Ti) films on SiO 2 substrates exhibit the phase separation of Cu and Ti after annealing at 400 °C. In this study, the diffusion behavior and phase separation were investigated using X-ray photoelectron spectroscopy (XPS), grazing angle incident X-ray diffraction (GIXRD), and transmission electron microscopy (TEM). The GIXRD pattern revealed that the Cu peak replaced the Cu 2 O peak after annealing. The formation Gibbs free energy of TiO 2 (−812 kJ) was lower than that of Cu 2 O (−109 kJ). The calculated diffusivity of Ti in Cu was one order of magnitude smaller than that of Cu in Cu. Thus, Ti was the dominant diffusing species that accumulated near SiO 2 , whereas Cu atoms were segregated near the surface. A few Cu islands were initially formed, and these Cu islands grew and formed continuous Cu layers after long-term annealing at 400 °C. The Cu(Ti) films were bonded face-to-face through thermo-compression. The nearly oxide-free Cu yields strong Cu bonding and a void-free interface. Highlights Phase separation of Cu(Ti) film during annealing. Cu atoms diffuse toward the surface and Ti toward the substrate. Thermodynamically and kinetically prove that Ti is the dominant diffusing species. Cu islands grow and form continuous Cu layers after annealing. Phase separation yields a void-free interface and strong Cu-Cu bonding. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   Selective liquid phase oxidation of cyclohexene over magnetic Fe3O4/graphene oxide nanocomposite  

    Balasubramanyan, Sowmya (Department of Chemistry, Sree Neelakanta Government Sanskrit College Pattambi (Affiliated to University of Calicut), Palakkad 679306, Kerala, India ) , Arayathody, Sandhya (Department of Chemistry, Sree Neelakanta Government Sanskrit College Pattambi (Affiliated to University of Calicut), Palakkad 679306, Kerala, India ) , Sugunan, Sankaran (Department of Applied Chemistry, Cochin University of Science and Technology, Cochin 22, Kerala, India ) , Narayanan, Binitha N. (Department of Chemistry, Sree Neelakanta Government Sanskrit College Pattambi (Affiliated to University of Calicut), Palakkad 679306, Kerala, India)
    Materials chemistry and physics v.211 ,pp. 23 - 33 , 2018 , 0254-0584 ,

    초록

    Abstract Magnetic graphene based nanocomposite catalysts were used for the first time in cyclohexene oxidation reaction. Fe 3 O 4 was found to be the active phase of Fe in the catalysts as evident from the XRD analysis of the samples. Presence of graphene as graphene oxide in the nanocomposites is confirmed from FTIR spectral analysis. The distribution of more or less spherical particles of Fe 3 O 4 over the graphene sheets was evident from the TEM photographs. The activity of bare Fe 3 O 4 increased drastically upon graphene incorporation. Maximum conversion of 92% was attained using tert -butyl hydroperoxide as the oxidant over the best nanocomposite catalyst in which Fe 3 O 4 was supported over 2 wt% graphene oxide. Using H 2 O 2 , double bond oxidation was the major reaction (78.27% conversion) and 1,2-cyclohexane diol was the major product (87.89% selectivity) under the selected reaction conditions of 0.05 g of catalyst with 5 mL of acetonitrile solvent at 70 °C in the 6 h reaction between 2 mmol of cyclohexene and 10 mmol of oxidant. Catalysts recovery from the reaction mixture was very easy by the use of a magnet that in turn facilitated the effective reusability of the Fe 3 O 4 /graphene nanocomposite. The reused catalyst was characterized using TEM and FTIR spectral analyses and it is found that the partial loss in activity can be a resultant of the oxidation of graphenic C=C and the formation of epoxy linkage and –OH groups in the sheets, which hinders the efficient electron migration during catalysis. Highlights Fe 3 O 4 -graphene oxide catalysts were used in cyclohexene oxidation reaction. Fe 3 O 4 /2 wt% GO lead to a conversion of 78% and diol selectivity of 87% using H 2 O 2 . Highest conversion of 92% has been obtained when TBHP is used as the oxidant. Reaction parameters were varied to attain the best suitable reaction condition. After the reaction, catalyst was effectively separated using a magnet and is reused. Graphical abstract Magnetic Fe 3 O 4 incorporated graphene oxide nanocomposite was used in cyclohexene oxidation and the magnetically separable catalyst is efficiently reused. [DISPLAY OMISSION]

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  8. [해외논문]   Preparation of multifunctional cascade iron oxide nanoparticles for drug delivery  

    Kurczewska, Joanna (Corresponding author.) , Cegłowski, Michał , Schroeder, Grzegorz
    Materials chemistry and physics v.211 ,pp. 34 - 41 , 2018 , 0254-0584 ,

    초록

    Abstract A novel pH sensitive magnetic multifunctional nanomaterial was prepared for sustained release of drugs. Adamantane derivative (ADMA) was covalently attached to the iron (II, III) oxide nanoparticles. On the basis of host-guest interactions, a stable inclusion complex between adamantane and succinyl β-cyclodextrin (CD-COOH) with ionically bonded polyamidoamnie dendrimer was formed. The dendrimer was used as a drug carrier of ibuprofen (IBU) and methotrexate (MTX), model therapeutic agents. In pH 7.4 IBU and MTX were released from dendrimer in sustained manner with Korsmeyer-Peppas kinetic model and case I transport mechanism. In pH 1.2, only a little amount of IBU and MTX was released, while acidic environment contributed to the degradation of the inclusion complex (ADMA and CD-COOH) and thereby releasing of antiviral ADMA drug. Highlights Multifunctional (adamantane – β-cyclodextrin – dendrimer) iron oxide - based delivery system was produced. Antiviral adamantane derivative (ADMA) was covalently attached to the iron oxide nanoparticles. Adamantane formed inclusion complex with β-cyclodextrin bearing ionically bounded dendrimer. Dendrimer was a carrier for two model drugs – ibuprofen (IBU) and methotrexate (MTX). The release of the drugs encapsulated at different parts of the system studied was dependant on pH conditions. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   Highly-efficient reinforcement and flame retardancy of rigid polyurethane foam with phosphorus-containing additive and nitrogen-containing compound  

    Yuan, Yao (State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, PR China ) , Ma, Chao (State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, PR China ) , Shi, Yongqian (College of Environment and Resources, Fuzhou University, Fuzhou 350002, PR China ) , Song, Lei (State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, PR China ) , Hu, Yuan (State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, PR China ) , Hu, Weizhao (State Key Laboratory of Fire Science, University of Science and Technology of China, Anhui 230026, PR China)
    Materials chemistry and physics v.211 ,pp. 42 - 53 , 2018 , 0254-0584 ,

    초록

    Abstract Flame retardant rigid polyurethane foam (RPUF) with a reactive melamine-derived polyol (MADP) and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) were fabricated through free-rise technique. The thermal stability and fire behaviors of RPUF were investigated by thermogravimetric analysis (TGA), limiting oxygen index (LOI), and cone calorimeter. In comparison with the results of RPUF and RPUF/MADP, RPUF/MADP-DOPO displayed higher compressive strength, owing to the two stiff phenyl groups of DOPO. Moreover, with only 7.5 wt % MADP and 7.5 wt % DOPO loading, the MADP/DOPO system endowed RPUF with enhanced char formation, increased LOI value of 28.5% and reduced heat release. Scanning electron microscope (SEM) images, X-ray photoelectron spectroscopy (XPS) analysis and Raman spectra of the char residues suggested that the formation of compact, continuous char layer. The thermal degradation was characterized using thermogravimetric analysis/infrared spectrometry (TG-IR) and chemical structure changes during the thermal degradation were monitored by real time Fourier transform infrared (RT-FTIR), these results demonstrated that the partial phosphorus from DOPO remained in the residual char, but the introduction of MADP significantly promoted generating more stable aromatic structure and enhanced the strength of the char layer formed. Furthermore, MADP facilitated the formation of more H 2 O and CO 2 and diluted the flammable gases in gaseous phase. Based on the analysis, the introduction of MADP/DOPO can endowed excellent flame retardancy to RPUF depending on bi-phase flame-retardant mechanism. Highlights Melamine-derived polyol (MADP) was synthesized through Mannich reaction. Both thermal stability and flame retardancy of RPUF/MADP-DOPO sample were enhanced remarkably. The synergism between MADP and DOPO is responsible for the formation of these compact and continuous chars. RPUF/MADP-DOPO sample has excellent flame retardancy depending on bi-phase flame-retardant mechanism. Graphical abstract [DISPLAY OMISSION]

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  10. [해외논문]   Strain induced magnetism and superexchange interaction in Cr substituted nanocrystalline cobalt ferrite  

    Kumar, Lawrence (Centre for Nanotechnology, Central University of Jharkhand, Ranchi 835205, India ) , Kumar, Pawan (Department of Physics, Mahatma Gandhi Central University, Motihari 845401, India ) , Kuncser, Victor (National Institute for Materials Physics, P.O. Box MG-7, 77125 Bucharest-Magurele, Romania ) , Greculeasa, Simona (National Institute for Materials Physics, P.O. Box MG-7, 77125 Bucharest-Magurele, Romania ) , Sahoo, Balaram (Materials Research Centre, Indian Institute of Science, Bangalore 560012, India ) , Kar, Manoranjan (Department of Physics, Indian Institute of Technology Patna, Bihta, Patna 801103, India)
    Materials chemistry and physics v.211 ,pp. 54 - 64 , 2018 , 0254-0584 ,

    초록

    Abstract Distribution of magnetic relaxation time using MOssbauer spectroscopy has been observed for CoFe 2-x Cr x O 4 (0.1 ≤ x ≤ 0.4) annealed at lower temperature (≤400 °C). The estimated cation distribution over A and B sites observed by MOssbauer spectroscopy is consistent with that obtained by the Rietveld analysis of the X-ray diffraction patterns. Saturation magnetization and magnetocrystalline anisotropy constant increase up to 20% of Cr (x = 0.2) substitution and, decrease with further increase of x. However, the coercive field as well as the NEel temperature decreases with increase in Cr 3+ concentration, i.e., a crossover from the hard magnetic to soft magnetic nature by Cr substitution at the Fe site of CoFe 2 O 4 has been observed. This behavior is attributed to the competition between strain induced magnetism and superexchange interaction between cations. Highlights Cation distribution in CoFe 2-x Cr x O 4 is obtained from the XRD as well as Mӧssbauer spectroscopy. Both ferrimagnetic and superparamagnetic phases coexist in nanocrystalline cobalt ferrites. Magnetocrystalline anisotropy constant has been modified in the CoFe 2 O 4 by Cr substitution. Coercivity of cobalt ferrite is tuned with Cr 3+ substitution. Graphical abstract MOssbauer spectra of CoFe 1.6 Cr 0.4 O 4 sample annealed at (a) 200 °C (b) 400 °C (c) 600 °C and (d) 800 °C. [DISPLAY OMISSION]

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