Simulation of a thin film growth in the presence of active and impurity particles
Hamidreza
Emamipour
عضو هیأت علمی گروه فیزیک، دانشکده علوم، دانشگاه ایلام، ایلام، ایران
author
Mohamadjavad
Niknejhad
گروه فیزیک، دانشکده علوم، دانشگاه ایلام، ایلام، ایران
author
text
article
2013
per
In this paper, in the framework of ballistic deposition model we simulate a thin film growth in the presence of two kinds of particles: an impurity particle (C) and an active particle (A).We calculate the roughness exponent and growth exponent of our model and compare them with the results of Kardar-Parisi-Zhang (KPZ) universality class. We find a critical probability (pc) in a way that for values smaller than pc, our model belongs to KPZ universality class, while for values greater than pc it does not belong to KPZ universality class.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
3
v.
5
no.
2013
1
8
http://jrmbs.scu.ac.ir/article_10711_eb3606aecd6662455d0b66c1884260f7.pdf
An AFM and SEM characterization of protective performance of epoxy reinforced with nanometer-sized TiO2
رقیه
پرویزی
Department of Physics, College of Sciences, Yasouj University, Yasouj 75914-353, Iran
author
سعید
آزاد
PhD Student of Yasouj University
author
Babak
Jaleh
گروه فیزیک، دانشکده علوم، دانشگاه بوعلی سینا، همدان
author
Mahdi
Farshchi Tabrizi
گروه فیزیک، دانشکده علوم، دانشگاه بوعلی سینا، همدان
author
text
article
2013
per
By inserting nanoparticles into a polymer matrix, a considerable improvement of properties can be achieved. In this investigation, weight fractions of TiO2 varied from 1% to 10% scale to prepare TiO2/Epoxy nanocomposites. The surface roughness and adhesion force between atomic force microscope (AFM) tip and nanocomposites have been studied for all samples which soaked in H2SO4 solution for different periods of time of 2, 5 and 10 days. Scanning electron microscopy (SEM) studies of the epoxy surfaces reveal corrosion growth as a kind of corrosion evolution. Significant improvement in corrosion resistance of nanocomposite with 5 wt. % of TiO2 nanoparticles was achieved. Besides, adding small fraction of TiO2 nanoparticles enhanced the hardness, while samples remain amorphous.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
3
v.
5
no.
2013
9
15
http://jrmbs.scu.ac.ir/article_10712_c0b11aece9711f27f3139c0c89ce858b.pdf
A study and comparison of entanglement dynamics for a W state in the presence of a magnetic field and DM interaction
مجتبی
جعفرپور
Shid Chamran University, Ahvaz, Iran
author
Samaneh
Hesabi
scu.ac.ir
author
text
article
2013
per
In this research we study the dynamics of a W state, instigated by the four Heisenberg Hamitonian models XX, Ising, XXZ and XXX analytically and also investigate the effect of the DM interaction and the magnetic field on the entanglement dynamics of the end qubits. It is observed that the application of a magnetic field on the whole system does not affect the entanglement; however, application of the field to single qubits does change the entanglement and sometimes may intensify the latter. Also it is revealed that the DM interaction does affect the entanglement and diminishes the latter for all the above-mentioned Hamiltonians.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
3
v.
5
no.
2013
17
27
http://jrmbs.scu.ac.ir/article_10713_256f003bfb220bbf91ca7fb9e2089301.pdf
Theoretical study of electronic conductance in a quantum system with two chain model leads
Kamyar
Ghaderi
دانشگاه زنجان
author
Farhad
Khoeini
عضو هیئت علمی گروه فیزیک دانشگاه زنجان
author
text
article
2013
per
In this study, we investigate the electron transport properties of a quantum device- with square lattice structure- attached to the two metallic leads. Based on the tight-binding model and Green’s function method, we calculate the electrical conductance of the system in the strong coupling regime, numerically. Our results show that with changing the width of the system and applying a uniform magnetic field, the transport properties of the system can be controlled. Also, by introducing a disordered structure in the system (vacancy defects), one can see a semiconducting behavior. By controlling parameters such as the system size, value of input flux and disorder, semimetal - and semiconductor - metal phase transitions occur in the system. The results of this research could have many applications in designing of nanoelectronic devices.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
3
v.
5
no.
2013
29
39
http://jrmbs.scu.ac.ir/article_10714_b55567e35000b821e9c0e5c0d04ea0e1.pdf
Effect of pH on the removal of copper ions from aqueous solutions using iron oxide nanoparticles and iron oxide/ hydroxyapatite nanocomposites
Sana
Ahmadizadeh
دانشجو
author
ایرج
کاظمی نژاد
عضو هیئت علمی گروه فیزیک دانشکده ی علوم دانشگاه شهید چمران اهواز
author
text
article
2013
per
In this study, iron oxide nanoparticles and iron oxide/hydroxyapatite nanocomposites were synthesized by co-precipitation method. The samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM). The XRD patterns of the samples confirm the hexagonal structure of hydroxyapatite and tetragonal structure of maghemite. FESEM results showed that both kinds of the prepared samples are almost spherical shape and the average particle sizes are 16±1 nm and 19±2 nm for iron oxide and iron oxide/hydroxyapatite nanocomposite, respectively. FTIR spectroscopy reveals expected bonds formation. Hysteresis curves of the nanoparticles showed that the coercivity of the nanoparticles is almost zero and the nanoparticles exhibit superparamagnetic behavior. The saturation magnetization of the iron oxide nanoparticles was obtained 14.98 emu/g, while the saturation magnetization of the iron oxide/ hydroxyapatite nanocomposites was reduced to 2.83 emu/g. Finally the produced nanoparticles were used as adsorbents for the removal of copper ions from aqueous solutions. In order to compare the ability of iron oxide nanoparticles and iron oxide/ hydroxyapatite nanocomposites to remove copper ions from the aqueous solutions, efficiency and capacity adsorbtion of copper ions by the particles at different pH were determined.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
3
v.
5
no.
2013
41
49
http://jrmbs.scu.ac.ir/article_10715_f139fd6b9ca4ead9c90d6a51f91ab09d.pdf
Electronic, thermodynamic and mechanical properties of CrAs
somaye
mahdavian mehrabani
دانشگاه آزاد قم
author
حسن
تشکری
ریئس دانشکده علوم پایه دانشگاه آزاد اسلامی واحد قم
author
فرامرز
کنجوری
عضو هیئت علمی دانشگاه خوارزمی
author
text
article
2013
per
In spintronics, transition-metal pnictides, such as CrAs in the metastable zinc-blende lattice structure, have attracted much interest due to their half-metallic ferromagnetism properties. In this paper, we have investigated the properties of CrAs in NiAs and zinc-blende structures by using ESPRESSO code. The calculations are based on the Density Functional Theory (DFT) and the Density Functional Perturbation Theory (DFPT) with the generalized gradient approximation (GGA).The Results show that CrAs in NiAs phase is metal and in zinc-blende phase is half-metal with direct band gap. The value of gap energy is 1.94 eV which is in good agreement with other previous calculations ( 1.88, 1.85, 1.87 and 1.8 eV). We have calculated Bulk module by fitting the lattice constants data to the Murnaghan equation of state. The elastic constants are calculated by using the slop of the phonon acoustic modes. The constants in NiAs phase are C11= 139.1 ,C66=83.4 ,C44=38.9 , C33=90.1 ,C12=61.1 , C13=85.4 and in zinc-blend phase are C11= 82.9 ,C44=24.5 , C12=60.1 and . According to our investigation, the elastic constants have not been calculated so far.
Journal of Research on Many-body Systems
Regional Information Center for Science and Technology (RICeST)
2322-231X
3
v.
5
no.
2013
51
60
http://jrmbs.scu.ac.ir/article_10716_2be094cbb4070ab1c3cb277883a28d4a.pdf