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RISS 인기검색어
- 검색키워드
- 저자 : Ghoranneviss, M. (검색결과 5 건)
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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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Effect of Ti Substrate Ion Implantation on the Physical Properties of Anodic TiO2 Nanotubes
Zahra Jedi-Soltanabadi,Mahmood Ghoranneviss,Zohreh Ghorannevis,Hossein Akbari Feizabad 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.5
The in uence of nitrogen-ion implantation on the titanium (Ti) surface is studied. The nontreated Ti and the Ti treated with ion implantation were anodized in an ethylene-glycol-based electrolyte solution containing 0.3 wt% ammonium uoride (NH4F) and 3 vol% deionized (DI) water at a potential of 60 V for 1 h at room temperature. The current density during the growth of the TiO2 nanotubes was monitored in-situ. The surface roughnesses of the Ti substrates before and after the ion implantation were investigated with atomic force microscopy (AFM). The surface roughness was lower for the treated Ti substrate. The morphology of the anodic TiO2 nanotubes was studied by using field-emission scanning electron microscopy (FESEM). Clearly, the titanium nanotubes grown on the treated substrate were longer. In addition, some ribs were observed on their walls. The optical band gap of the anodic TiO2 nanotubes was characterized by using a diffuse re ection spectral (DRS) analysis. The anodic TiO2 nanotubes grown on the treated Ti substrate revealed a band gap energy of approximately 3.02 eV.
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Samane Parsian,Mohammad Mirjalili,Sheila Shahidi,Mahmood Ghoranneviss 한국섬유공학회 2018 Fibers and polymers Vol.19 No.4
The main aim of this research work is in situ synthesis of carbon nano tube (CNT) on nonwoven glass mat. Different types of catalyst were used and the effect of them on growth of carbon nanotubes on glass mat was investigated. The process was considered as variable catalysts to achieve optimal conditions for CNT deposition on glass mat. In this research, iron, cobalt, copper and nickel were used as catalysts and acetylene gas was used as the hydrocarbon source. Also, argon was used as a carrier gas. In first step, samples were coated by mentioned catalyst using plasma sputtering method. The thickness of the catalyst on the surface of samples was fixed at 100 nm. In second part, thermal chemical vapor deposition (TCVD) system was used for growth of carbon nano tubes. Scanning electron microscopy (SEM) and raman spectroscopy, thermogravimetric analysis (TGA-DTG) and transmission electron microscopy (TEM) were used for investigating the morphology and quality of produced CNT. Electrical conductivity was observed and compared on both untreated and coated glass mat. The results show that, by pre sputtering of samples with nickel, the quality of CNT on the surface of glass mat will be improved and the resistivity of samples reach to 610 Ω.
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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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