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RISS 인기검색어
- 검색키워드
- 저자 : M. GHORANNEVISS (검색결과 3 건)
- 무료
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Effects of different substrate materials on synthesis of Cu nanoparticles
M. Ghoranneviss,F. Yaghobian,M. Farbod,M. Eshghabadi 한국물리학회 2009 Current Applied Physics Vol.9 No.11
We discuss about the controlled self-assembled synthesis of metallic Cu nanoparticles on different substrates such as glass, Al2O3 and SiO2 at room temperature by the dc magnetron sputtering technique. Deposits have been made using Cu cylindrical target for a 2 m Torr Argon sputtering. After deposition, the films were annealed using oven at 400 ℃ for 10 min to induce the nucleation and growth of Cu nanoparticles. The average primary grain size of the materials thus synthesized could be controlled by proper choice of process parameters (the pressure of the sputtering gas, applied power, substrate material, annealing time and temperature). AFM and SEM/EDX were both applied to characterize the nanostructures of Cu nanoparticles in this study. We discuss about the controlled self-assembled synthesis of metallic Cu nanoparticles on different substrates such as glass, Al2O3 and SiO2 at room temperature by the dc magnetron sputtering technique. Deposits have been made using Cu cylindrical target for a 2 m Torr Argon sputtering. After deposition, the films were annealed using oven at 400 ℃ for 10 min to induce the nucleation and growth of Cu nanoparticles. The average primary grain size of the materials thus synthesized could be controlled by proper choice of process parameters (the pressure of the sputtering gas, applied power, substrate material, annealing time and temperature). AFM and SEM/EDX were both applied to characterize the nanostructures of Cu nanoparticles in this study.
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Effect of Using Cold Plasma on Dyeing Properties of Polypropylene Fabrics
Shahidi, S.,Ghoranneviss, M.,Moazzenchi, B.,Rashidi, A.,Dorranian, D. The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.1
The low temperature plasma(LTP) technique is used widely to modify polymer and textile materials. This paper describes the development of a plasma system for textile treatment. Polypropylene(PP) has a very low value of the surface free energy(approximately 20-25 $mJ/m^2$). Due to low surface energy, Polypropylene has very weak hydrophilic properties. By controlling the plasma variables, such as the nature of gas, the discharge power, the pressure and the exposure time, a great variety of surface effects can be generated. In this paper, we report the effect of cold plasma of $O_2\;and\;N_2$ gases at various time of exposure on the dyeing and physical properties of PP fabrics. The results show a significant increase in the color depth upon dyeing after treating PP fabrics with low temperature plasma of $O_2\;and\;N_2$. For comparing the amount of fabrics dye exhaustion, we have used reflective spectrophotometer. The morphology of the modified surfaces has also been investigated using scanning electron microscopy(SEM). And also FTIR was used to examine the functional groups of the corresponding samples.
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Z. PARANG,A. KESHAVARZ,S. FARAHI,S. M. ELAHI,M. GHORANNEVISS,A. NASSERI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.2
Ag/Co nanoparticles (NPs) were prepared by a two-step method. First, Ag NPs were synthesized by "Controlled Current Coulometry" (CCC) electrochemical method using a Pt rotating electrode. Then, Ag/Co core-shell NPs were prepared through the reduction method using Ag NPs as a core. Both steps were accomplished at room temperature. Techniques such as patterned X-ray diffraction (XRD) and transmission electron microscopy (TEM) were employed for the characterization of Ag/Co NPs. Optical properties of synthesized NPs were also investigated by UV-Vis spectroscopy. The absorption peak of Ag NPs was observed at ~400 nm wavelength and the peaks that were detected at 425 nm and 415 nm wavelengths reveal the formation of Ag/Co NPs. The core-shell structure of Ag/Co NPs was confirmed by thermal and electrochemical techniques. We also applied "Mie" theory to calculate the absorption cross-section band of synthesized Ag/Co NPs. Comparison between the results of optical properties and also those obtained from "Mie" theory showed good agreements.
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