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Sterilization of Cotton Fabrics Using Plasma Treatment

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Plasma Science and Technology 2013年第10期15卷 1031-1033页

作者： S.SHAHIDI m.ghoranneviss Department of Textile Faculty of EngineeringIslamic Azad University Plasma Physics Research Center Science and Research BranchIslamic Azad University

microbial contamination induces surface deformations and strength degradation of cotton fabrics by invading deeply into the fibers. In this study, the sterilization effects of low pressure plasmas on bacteria-inoculated cotton fabrics were investigated. Oxygen plasma treatment completely sterilized the cotton fabrics inoculated with various concentrations of staphylococcus aureus. Also, the influence of plasma treatment on physical properties of fabrics was examined. It was found that the plasma treatment did not affect ultimate tensile strength and surface morphology of the fabrics because it took advantage of relatively low plasma temperature.

关键词： sterilization fabri plasma treatment

Optimization of Gas Sensing Performance of Nanocrystalline SnO_2 Thin Films Synthesized by magnetron Sputtering

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Chinese Physics Letters 2016年第6期33卷 99-103页

作者： N.Panahi m.T.Hosseinnejad m.Shirazi m.ghoranneviss Department of Physics Bandar Abbas BranchIslamic Azad University Young Researchers and Elite Club Science and Research BranchIslamic Azad University Plasma Physics Research Center Science and Research BranchIslamic Azad University

Tin oxide （SnO2） is one of the most promising transparent conducting oxide materials, which is widely used in thin film gas sensors. We investigate the dependence of the deposition time on structural, morphologicaJ and hydrogen gas sensing properties of SnO2 thin films synthesized by dc magnetron sputtering. The deposited samples are characterized by XRD, SEm, AFm, surface area measurements and surface profiler. Also the H2 gas sensing properties of SnO2 deposited samples are performed against a wide range of operating temperature. The XRD analysis demonstrates that the degree of crystallinity of the deposited SnO2 films strongly depends on the deposition time. SEm and AFm analyses reveal that the size of nanoparticles or agglomerates, and both average and rms surface roughness is enhanced with the increasing deposition time. Also gas sensors based on these SnO2 nanolayers show an acceptable response to hydrogen at various operating temperatures.

关键词： of on as it or in Optimization of Gas Sensing Performance of Nanocrystalline SnO2 Thin Films Synthesized by magnetron Sputtering SnO by

Growth and Physical Properties of CdS/TiO_2 Bilayer by Plasma-Based method

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Chinese Physics Letters 2018年第3期35卷 39-42页

作者： T.Hoseinzadeh m.ghoranneviss E.Akbarnejad Z.Ghorannevis Department of Physics Science and Research Branch Islamic Azad University Department of Physics Karaj Branch Islamic Azad University

The titanium oxide （TiO2） nanotubes have attracted attention for their use in dye-sensitized solar cells as photoanode. In this study semiconducting cadmium sulfide （CdS） nanoparticles arc grown on top opened TiO2 nanotubes arrays by radio-frequency magnetron sputtering. X-ray diffraction, scanning electron mieroscopy, transmission electron microscopy and diffuse reflection spectra are used to study structural, morphological and optical properties of the CdS/TiO2 bilayer.

关键词： CdS TiO Growth and Physical Properties of CdS/TiO2 Bilayer by Plasma-Based method

Synthesis of Different TiO2 Nanostructures and Their Physical Properties

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Chinese Physics Letters 2017年第11期34卷 53-56页

作者： T.Hoseinzadeh Z.Ghorannevis m.ghoranneviss m.K.Salem A.H.Sari Department of Physics Science and Research BranchIslamic Azad UniversityTehranIran Department of Physics Karaj BranchIslamic Azad UniversityKarajIran

Titanium dioxide （TiO2） nanosheet, nanorod and nanotubes are synthesized using chemical vapor deposition （CVD） and anodizing processes. TiO2 nanosheets are grown on Ti foil which is coated with Au catalyst in CVD, TiO2 nanorods are synthesized on treated Ti foil with HCl by CVD, and TiO2 nanotubes are prepared by the three-step anodization method. Scanning electron microscopy shows the final TiO2 structures prepared using three processes with three different morphologies of nanosheet, nanorod and nanotube. X-ray diffraction verifies the presence of TiO2. TiO2 sheets and rods are crystalized in rutile phase, and TiO2 tubes after annealing turn into the anatase crystal phase. The optical investigations carried out by diffuse reflection spectroscopy reveal that the morphology of TiO2 nanostructures influencing their optical response and band gap energy of TiO2 is changed for different TiO2 nanostructures.

关键词： XRD SEm TiO Synthesis of Different TiO2 Nanostructures and Their Physical Properties

Improving Plasma Confinement by Controlling Hard X-Ray

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Chinese Physics Letters 2016年第11期33卷 67-70页

作者： N.Hasanvand m.R.Riazifar R.Alipour S.meshkani m.ghoranneviss Plasma Physics Research Center Science and Research BranchIslamic Azad University

Since runaway electrons and magnetohydrodynamics activity can contribute to serious damage and energy losses in tokamaks, the effect of an external electric field on runaway electrons and hard x-ray spectra is investigated. Parameters such as the plasma current, the hard x-ray photons count and the mean energy of runaway electrons are measured. Positive and negative voltages of 300 V are applied at lOms after the plasma initiation （while the plasma is forming）, at 15ms （while the plasma is stable） and at 20ms （while the plasma is fading away） to attain the most effective time of applying the external electric field. The number of hard x-ray photons has the most changes in the range of O-200 keV when the external electric fields are applied. Also in the duration of 20-30ms of plasma the greatest number of hard x-ray spectra is detected. When the external electric fields are applied, the mean energy of runaway electrons reduces significantly, especially at 15 ms （while the plasma is stab/e）.

关键词： of is that as on in Improving Plasma Confinement by Controlling Hard X-Ray by

Estimating the Radial Profile of Edge Plasma Electrical Fluctuations in the IR-T1 Tokamak

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Chinese Physics Letters 2013年第2期30卷 165-168页

作者： K.mikaili Agah m.ghoranneviss m.K.Salem A.Salar Elahi S.mohammadi R.Arvin Plasma Physics Research Center Science and Research BranchIslamic Azad UniversityTehranIran

The radial dependence of edge plasma turbulence is investigated in the IR-T1 *** radial profile of the fluctuation level and spectra are measured using an array of Langmuir probes(rake probe)in the r/a=0.75-1.2 *** all radial positions the edge plasma is turbulently unstable,with a broad band fluctuation spectrum in the frequency range f=10-1000 *** relative fluctuation level,as monitored by the ion saturation current J_(+),is always highest near the wall and decreases monotonically toward the plasma center,while the shape of the fluctuation power spectra is almost *** result of this experiment shows that in contrast to the more inner regions,the plasma near the wall does not simply have a small density fluctuation about a mean,but rather a shredded structure in which one can imagine that discrete shreds of plasma interact with one another rather than with the average background.

关键词： Plasma unchanged unstable

Growth of Nano Crystalline Diamond on Silicon Substrate Using Different Etching Gases by HFCVD

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Chinese Journal of Chemical Physics 2010年第6期23卷 689-692,746页

作者： Z.Khalaj m.ghoranneviss S.Nasirilaheghi Z.Ghorannevisb R.Hatakeyama 伊朗伊斯兰阿萨德大学等离子物理研究中心德黑兰日本东北大学电子工程学系仙台980—8579

We investigate the effects of etching gases on the synthesis of nano crystalline diamonds grown on silicon substrate at the substrate temperature of 550℃ and the reaction pressure of 4 kPa by hot filament chemical vapor deposition method, in which CH4 and H2 act as a source and diluting gases, respectively. N2, H2, and NH3 were used as the etching gases, respectively. Results show that the optimum conditions can be obtained only for the case of H2 gas. The crystal morphology and crystallinity of the samples have been examined by scanning electron microscopy and X-ray diffraction, respectively.

关键词： Nano crystalline diamond Etching gas Hot filament chemical vapor deposition

mF-DFA Analysis of Turbulent Transport measured by a multipurpose Probe

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Chinese Physics Letters 2015年第10期32卷 76-79页

作者： Lafouti m.ghoranneviss m Department of Physics Damavand Branch Islamic Azad University Damavand Iran Plasma Physics Research Center Science and Research Branch Islamic Azad University Tehran Iran

The effect of time of applied bias on the edge turbulent transport is analyzed by the multi-fractal detrend fluctu- ation analysis （mF-DFA） method in the IR-Tl tokamak. The generalized Hurst exponents and the multifractal spectrum are computed by this method. The mF-DFA method is applied to the fluctuation of gradient of float- ing potential time series collected by a multipurpose probe. Tile monofractality or multifractality of the time series can be detected by generalized exponent. The multifractal spectrum describes the singularity content of the process. The results show that with applying bias to the plasma at different times （t = 15 ms, 18ms and 22ms）, the degree of multifractality changes. It reaches the minimum when the bias is applied at t = 18 ms. The multifractality source of data is investigated by the surrogate method （phase randomization techniques）. The surrogate method can destroy the different types of correlations in all the sizes of fluctuations. The results show that the long-range correlation contributes more to multifractality than the fat tail distribution.

关键词： TURBULENCE mULTIFRACTALS RANDOmIZATION (Statistics) CORRELATION (Statistics) TImE series analysis

Influences of substrate temperature on microstructure and corrosion behavior of APS Ni_(50)Ti_(25)Al_(25) inter-metallic coating

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Chinese Physics B 2018年第2期27卷 607-612页

作者： Sh Khandanjou m.ghoranneviss Sh Saviz m Reza Afshar Plasma Physics Research Center Science and Research Branch Islamic Azad University Department of materials Engineering Science and Research Branch Islamic Azad University

In the present investigation, Ni_（50）Ti_（25）Al_（25）（at.%） mechanically alloyed powder is deposited on carbon steel *** the coating process, the substrate is heated to temperature ranging from room temperature to 400℃. The microstructure, porosity, microhardness, adhesion strength, and corrosion behavior of the coating are investigated at different substrate temperatures. Results show that coating porosity is lower on high temperature surface. microhardness and adhesion strength of the deposition layer on the substrate without preheating have lower values than with preheating. The polarization test result shows that corrosion performance of the coating is dependent on micro cracks and porosities and the increasing of substrate temperature can improve the quality of coating and corrosion performance.

关键词： Ni50Ti25Al25 coating air plasma spray planetary ball milling inter-metallic compounds corrosion resistance