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    Effect of electron irradiation on polypropylene films

    , Article Plasma Science and Technology ; Volume 13, Issue 2 , 2011 , Pages 194-196 ; 10090630 (ISSN) Shahidi, S ; Wiener, J ; Ghoranneviss, M ; Anvari, A ; Sharif University of Technology
    Effects of both electron beam irradiation on the properties of polypropylene (PP) films and the irradiation on the different layers of a multilayer PP film are studied. A Fourier transform infrared spectroscope was used to investigate the chemical structure of the films. The results showed that the chemical properties of the first layer were improved, that is, more functional groups responsible for dye ability and hydrophilicity of the film were produced on its surface, while noticeable improvement was not detected on the surface of other layers. This was also confirmed by testing the dye ability of the layers. However, the results obtained by atomic force microscopy showed that the electron... 

    Plasma effects on anti-felting properties of wool fabrics

    , Article Surface and Coatings Technology ; Volume 205, Issue SUPPL. 1 , December , 2010 , Pages S349-S354 ; 02578972 (ISSN) Shahidi, S ; Rashidi, A ; Ghoranneviss, M ; Anvari, A ; Wiener, J ; Sharif University of Technology
    Low temperature plasma (LTP) is nowadays an intensively investigated superficial treatment of wool. In this work we have investigated the effect of LTP on wool fabric under different conditions. The effect of the position of samples inside the reactor and the kind of gases used as discharge medium has been also investigated. The results show that not only the topography of the surface is modified but also the chemical composition of the surface. It is shown that the hydrophilicity of the samples and also their shrink resistance and anti-felting behavior have improved significantly under LTP treatment. The results show that the shrinkage of 30.1% for untreated samples has reduced to about... 

    Effect of electron irradiation on dye and printability of polypropylene (PP) fabrics: A novel method for decoration of PP fabrics

    , Article Journal of the Textile Institute ; Volume 101, Issue 11 , Sep , 2010 , Pages 988-995 ; 00405000 (ISSN) Payamara, J ; Shahidi, S ; Ghoranneviss, M ; Wiener, J ; Anvari, A ; Sharif University of Technology
    Polypropylene (PP) has a very low value of the surface free energy (approximately 20-25 mJ m-2). And thus, has very weak hydrophilic properties and doesn't have any affinity to any dyestuffs, such as cationic or anionic dyes. In this study, we covered some parts of PP fabrics by mask, and then irradiated them by electrons with different energies. After electron irradiation, the samples were dyed by cationic dyestuff. The result showed that, electron irradiated parts could be dyed easily and the fabric could be printed and decorated simply. The treated surfaces were investigated by scanning electron microscope (SEM), reflective spectrophotometery, and Fourier transform infrared spectroscopy... 

    Recent results of edge plasma parameters measurements in IR-T1 tokamak by probe

    , Article Journal of Fusion Energy ; Volume 29, Issue 3 , June , 2010 , Pages 271-274 ; 01640313 (ISSN) Shariatzadeh, R ; Emami, M ; Ghoranneviss, M ; Abaspour Tehrani Fard, A ; Sharif University of Technology
    Langmuir probes (LP) are the most common diagnostics for the local measurement of very important plasma parameters such as plasma density, electron temperature, plasma potential and the electron energy distribution function (EEDF). In this paper the applicability of the first derivative Langmuir probe method in processing the electron part of the current-voltage (I-V) characteristics in IR-T1 Tokamak is reported. The EEDF at different radial positions in the edge region and Scrape off Layer (SOL) are derived and the values of the plasma potential, electron temperature and electron density are estimated. Results comparison between the first derivative method and Stangeby method shows a... 

    Role of cooling rate in selective synthesis of graphene and carbon nanotube on Fe foil using hot filament chemical vapor deposition

    , Article 2016 IEEE 7th Annual Ubiquitous Computing, Electronics and Mobile Communication Conference, UEMCON 2016, 20 October 2016 through 22 October 2016 ; 2016 ; 9781509014965 (ISBN) Abdolahi, M ; Kaminska, B ; Akhavan, O ; Talebi, S ; Ghoranneviss, M ; Arab, Z ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2016
    In this study, graphene sheets and carbon nanotubes (CNTs) were selectively grown on Fe foil at a relatively low growth temperature and varying cooling rates using a hot filament chemical vapor deposition (HFCVD) apparatus with C2H2 as the precursor. The results of the scanning electron microscopy and Raman spectroscopy revealed that the increase of the cooling rate from 7 to 10 or 20 °C/min provoked a structure transition from CNT to graphene. The optimum crystal quality of the graphene sheets (Iq/Id ∼1.1) was achieved at the cooling rate of 20 °C/min. According to the AFM analysis, the thickness of the stacked graphene sheets was found to be ∼2.9-3.8 nm containing ∼8-11 monolayers. The XRD... 

    Design and fabrication of a movable langmuir probe for plasma edge parameters measurement in the IR-T1 tokamak

    , Article Journal of Fusion Energy ; Volume 28, Issue 3 , 2009 , Pages 296-299 ; 01640313 (ISSN) Shariatzadeh, R ; Ghoranneviss, M ; Emami, M ; Anvari, A ; Van Oost, G ; Sharif University of Technology
    For the edge plasma parameters measurement, a movable Langmuir probe is fabricated and installed on the IR-T1 tokamak. The set-up consists of two sets of single Langmuir probes with tungsten tip movable in the radial direction. Edge plasma parameters including electron temperature, Ion density, floating potential and the corresponding radial changes are measured. Using two-point correlation technique clearly reveal that in the SOL region the poloidal propagation of floating potential fluctuation is in the direction of ion diamagnetic drift and in the edge it propagates in the electron diamagnetic drift direction. © 2009 Springer Science+Business Media, LLC  

    Evaluation of parameters affecting arc plasma chute in a typical gas interrupter

    , Article Japanese Journal of Applied Physics ; Volume 47, Issue 1 , 2008 , Pages 284-286 ; 00214922 (ISSN) Borghei, S. M ; Ghoranneviss, M ; Abolhassani, M. R ; Anvari, A ; Sharif University of Technology
    In this study, we examined a typical high-voltage gas circuit breaker. The main goal of this study is to characterize arc plasma and to determine its behavior using the generalized Mayr-type equation model following the interruption of high-voltage circuit breakers according to a semi-empirical one, named conductance model. Here, we tried to evaluate some arc parameters that affect interrupting ability by performing a numerical analysis so that our model defines recorded experimental results of an actual test. © 2008 The Japan Society of Applied Physics  

    Aluminum coatings on cotton fabrics with low temperature plasma of argon and oxygen

    , Article Surface and Coatings Technology ; Volume 201, Issue 9-11 SPEC. ISS , 2007 , Pages 5646-5650 ; 02578972 (ISSN) Shahidi, S ; Ghoranneviss, M ; Moazzenchi, B ; Anvari, A ; Rashidi, A ; Sharif University of Technology
    In this article, we have studied the properties (especially water repellency) of cotton coated by a thin layer of aluminum. The process has been performed in a low temperature plasma medium, using a magnetron sputtering device. We have also investigated the effect of different gases such as argon and oxygen as the discharge medium on the properties of the obtained samples. The results which are exposure time dependent show a good repellent property for 30 min of treating in argon medium under the condition of our experiment. However, when O2 is used in the system, the cotton property changes to become hydrophilic of which the factor decreases as we increase the time of treating. © 2006... 

    Investigation of metal absorption and antibacterial activity on cotton fabric modified by low temperature plasma

    , Article Cellulose ; Volume 17, Issue 3 , 2010 , Pages 627-634 ; 09690239 (ISSN) Shahidi, S ; Rashidi, A ; Ghoranneviss, M ; Anvari, A ; Rahimi, M. K ; Bameni Moghaddam, M ; Wiener, J ; Sharif University of Technology
    In this work, the silver particle absorption and antibacterial activity of cotton fabric when modified by low temperature plasma were investigated. The modification consisted of plasma pre-functionalization followed by one-step wet treatment with silver nitrate solution. Oxygen and nitrogen were used as the working gases in the system, and the results were compared. The results showed that nitrogen plasma-treated samples can absorb more silver particles than oxygen-treated samples, and thus the antibacterial activity of the samples in this case, which was analyzed by the counting bacteria test, was increased considerably