The Effect of Impurity of Inert Atmosphere on Synthesis of Nanostructure TiAl (γ) Alloy by Mechanical Alloying Process
F.
Abbasi Nargesi
Matrials Engineering Faculty, Sahand University of Technology, Tabriz, I. R. Iran
author
R. Azari Khosroshahi
Azari Khosroshahi
Matrials Engineering Faculty, Sahand University of Technology, Tabriz, I. R. Iran
author
N.
Parvini Ahmadi
Matrials Engineering Faculty, Sahand University of Technology, Tabriz, I. R. Iran
author
text
article
2012
eng
In this research, the high-energy planetary mill was employed to produce nanocrystalline Ti-50Al(γ)(at%) powders. Initial powders were mechanically alloyed in 99.9999% and 90% purities of Argon and also Air atmosphere with alloying times up to 50h. The effect of impurity of Argon atmosphere on the microstructure and the rate of phase transformation of Ti-50Al were investigated during mechanical alloying and after annealing at 1000°c. The results showed that the formation of nanostructure TiAl(γ) phase had directly related to the impurities of atmosphere in vials. The impurity of the atmosphere could delay the rate of amoprphization during mechanical alloying and decrease the rate of mechanical alloying process beside some unwanted phases which were produced in powder mixture. The powder particles produced in the high purity Argon atmosphere seemed to be finer than those in the atmosphere. The X-ray patterns, SEM analysis, changes in grain size and DTA test were studied during mechanical alloying and after annealing.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
63
70
https://www.ijnnonline.net/article_3906_c30d85ce3d48cf189abeb037338e2d94.pdf
A Comparison between β-Cyclodextrin and Chitosan as Soft Organic Materials for Surface Modification of MWCNTs
T.
Matsuura
Industrial Membrane Research Laboratory, Department of Chemical and Biological Engineering,
author
M. A.
Aroon
Membrane Research Laboratory, School of Chemical Engineering, College of Engineering,
University of Tehran, Tehran, I. R. Iran
author
A. F.
Ismail
Advanced Membrane Technology Center, Universiti Teknologi Malaysia , 81310 Skudai, Johor, Malaysia
author
text
article
2012
eng
In this paper, synthesized (raw) multi-walled carbon nanotube (rMWCNTs) surfaces were modified with chitosan and β-cyclodextrin using Chen’s soft cutting technique. Raw and surface modified multi-walled carbon nanotubes were observed by transmission electron microscope (TEM). The results showed that chitosan and β-cyclodextrin could attach to the outer surface of nanotubes, wrapping the nanotubes axially. In contrast to the chitosan, β-cyclodextrin not only would attach to the inner and outer surface of the MWCNT walls but also fill their hollow section. It was also found that the surface modified MWCNTs were shorter and their dispersion in organic solvent (NMP) was better than r-MWCNTs. Sedimentation test revealed that dispersion of β-cyclodextrin surface modified MWCNTs was better stabilized in NMP solvent than the chitosan surface modified MWCNTs.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
71
78
https://www.ijnnonline.net/article_3907_1e2dfc1d0087730078bbf1b2a06ebbff.pdf
Magnetic Multi-Walled Carbon Nanotube as an Adsorbent for Toluidine Blue O Removal from Aqueous Solution
F.
Hamidi Malayeri
Department of Biophysics, Institute of Biochemistry and Biophysics, University of Tehran,
Tehran, I. R. Iran
Department of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, I. R. Iran
author
M. R.
Sohrabi
Department of Chemistry, Islamic Azad University, North Tehran Branch, Tehran, I. R. Iran
author
H.
Ghourchian
- Department of Biophysics, Institute of Biochemistry and Biophysics, University of Tehran,
Tehran, I. R. Iran
Nanobiomedicine Center of Excellence, Nanoscience and Nanotechnology Research Center,
University of Tehran, Tehran, I. R. Iran
author
text
article
2012
eng
Toluidine Blue O (TBO) is a cationic dye which is extensively used in the industries. In the present paper a simple and efficient wet chemical method was introduced for removal of TBO from waste aqueous solution. Magnetic multi-walled carbon nanotubes were synthesized using commercially available multi-wall carbon nanotubes and magnetic iron oxide nanoparticles which were examined for removal of TBO. The magnetic adsorbents were easily manipulated using an external magnetic field for desired separation, causing the removal of dyes from polluted water. The experimental results revealed that after 30 min, the separation process for TBO absorption reaches to equilibrium at pH 7.0. The optimum condition for removal of TBO was reported.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
79
86
https://www.ijnnonline.net/article_3908_3c81dec3a00c46408d43d0081f93974c.pdf
Synthesis and Characterization of α-Fe2O3 Nanoparticles by Microwave Method
S. Z.
Mohammadi
Department of Chemistry, Payame Noor University, I. R. IRAN
author
M.
Khorasani-Motlagh
Department of Chemistry, Sistan & Baluchestan University, Zahedan, I. R. IRAN
author
Sh.
Jahani
Department of Chemistry, Sistan & Baluchestan University, Zahedan, I. R. IRAN
author
M.
Yousefi
Department of Chemistry, Sistan & Baluchestan University, Zahedan, I. R. IRAN
author
text
article
2012
eng
α-Fe2O3 (hematite) is the most stable iron oxide under ambient conditions. This transition metal oxide has been extensively investigated because it has unique electrical and catalytic properties. In this report, a novel microwave method for preparation of α-Fe2O3 nanoparticles has been developed. The process contained two steps: first, precursor were obtained from a mixed solution of 50 ml of 0.3 M Fe (NO3)2.9H2O and 1.2 g of urea under 540 W microwave irradiated for 6 min. Then, the precursors were calcined at 800 °C to fabricate pure α-Fe2O3 (hematite) nanoparticles for 4 h. Nanoparticles were characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and Energy dispersive X-ray spectrometer (EDX) technique. The results indicate that the morphologies of final products significantly depend on the reaction conditions including the reaction time, the initial concentration of precursor, reagent and calcinations temperature.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
87
92
https://www.ijnnonline.net/article_3909_75ca9bcd50a49f70f707d5a9ef0848fc.pdf
Superparamagnetic Behavior of the Magnetic Hysteresis Loop in the Fe2O3@Pt Core-Shell Nanoparticles
Z.
Alborzi
Department of Physics, Faculty of Science, Urmia, I. R. Iran
author
A.
Hassanzadeh
Department of Chemistry, Faculty of Science, Urmia, I. R. Iran
Nanotechnology Research Center of Urmia University, Urmia, I. R. Iran
author
M. M.
Golzan
Department of Physics, Faculty of Science, Urmia, I. R. Iran
Nanotechnology Research Center of Urmia University, Urmia, I. R. Iran
author
text
article
2012
eng
Studies of the magnetization of Fe2O3@Pt nanoparticles at room temperature showed that there is superparamagnetic contribution with high saturation magnetization about 12.35(emu/g), and soft ferromagnetic contribution with narrow coercive field about 58(Oe). In this paper we fitted the hystersis loop of sample with Brillouin function that demonstrating existence of superparamagnetic phase. Total angular momentum quantum number J With computations performance, gave consistent value at high level that could be the reason into existence of spin clusters. Upshot theoretically, magnetic susceptibility of this sample was calculated from the Brillouin function at fields less than 1000(Oe) from 0.1 to 400 K to determine the high-temperature susceptibility.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
93
98
https://www.ijnnonline.net/article_3911_8518066af2eba06ebe9780fcbf1a091d.pdf
Synthesis of Different Copper Oxide Nano-Structures From Direct Thermal Decomposition of Porous Copper(ΙΙ) Metal-Organic Framework Precursors
N.
Nasihat Sheno
Department of Chemistry, Payame Noor University, Abhar, Zanjan, I. R. Iran
author
A.
Morsali
Department of Chemistry, Faculty of Sciences, Tarbiat Modares University, Tehran, I. R. Iran
author
text
article
2012
eng
Copper oxide nanostructures have been successfully synthesized via one-step solid-state thermolysis of two metal-organic frameworks, [Cu3(btc)2] (1) and [Cu(tpa).(dmf)] (2), (btc = benzene-1,3,5-tricarboxylate, tpa = therephtalic acid = 1,4-benzendicarboxylic acid and dmf = dimethyl formamide) under air atmosphere at 400, 500, and 600°C. It has also been found that the reaction temperature plays a substantial role in the formation of copper oxide nanostructures. The obtained products were characterized by X-ray powder diffraction (XRPD), Energy dispersive X-ray microanalysis (EDX), and scanning electron microscopy (SEM). Different reaction conditions were discussed. This study demonstrates that the metal-organic frameworks can be used as precursors for the preparation of nanoscale materials with difference and remarkable morphologies.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
99
104
https://www.ijnnonline.net/article_3912_c92b9f3e462bf6d1e0703aa1c8a32317.pdf
Solubility Study in Ag-Cu Binary System Prepared By Ball Milling Process
S. M. M.
Shafiei
Materials and Energy Research Center (MERC)
author
E.
Salahi
Materials and Energy Research Center (MERC)
author
S. A.
Tayebi Fard
Materials and Energy Research Center (MERC)
author
text
article
2012
eng
Solid solutions of Ag-Cu were prepared via ball milling process, for about 5-30 h. The Cu-20at%Ag and Cu-3.64at%Ag composition were investigated by X-ray diffraction technique. It was realized that the solid solubility level could be increased by increasing the initial solute content in the mixture. In addition, shifts in peak positions of silver and copper were observed with milling time. The dissolution volume was estimated by thermodynamic relations and was compared with the measured values using X-ray diffraction technique and it was observed that the measured and calculated volumes agreed well. The final dissolution volume of 39.155 litters was calculated by thermodynamic relationship.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
105
110
https://www.ijnnonline.net/article_3915_b19709e74907538e9dd66bbf846d9632.pdf
Optical, Thermal and Structural Properties of CdS Quantum Dots Synthesized by A Simple Chemical Route
N.
Qutub
Department of Chemistry, Aligarh Muslim University, Aligarh, 202002, India
author
S.
Sabir
Department of Chemistry, Aligarh Muslim University, Aligarh, 202002, India
author
text
article
2012
eng
The present work deals with the synthesis and characterization of CdS nanoparticles with good thermal stability and optical properties by a novel and simple synthetic route. The nanoparticles were synthesized via chemical precipitation method in a single reaction vessel under ambient conditions. The prepared CdS nanoparticles were compared with the bulk CdS. The Optical properties were determined by using UV-Vis spectroscopy. The band gap from Absorption Spectra was found to be 2.66eV (470nm) while that of bulk is 2.42eV (515nm). Thermal properties were determined by DTA, TGA and DTG. The particles show good thermal stability with high melting point (~12500C). Structural and Morphological properties were analyzed by FTIR, XRD, SEM and TEM. The XRD pattern exhibit features of cubic crystal structure having morphology of octahedron and tetragonal phases. The particle size calculated from UV-Vis Spectroscopy, XRD and TEM was well below 10 nm.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
111
120
https://www.ijnnonline.net/article_3916_d2755e284ae46d1884148a73873eb1ed.pdf
The Effect of pH on Nanosized ZnO Catalyzed Degradation of 4-Chloro-2-Nitrophenol via Ozonation
P.
Gharbani
Department of Chemistry, Ahar Branch, Islamic Azad University, Ahar, I. R. Iran
author
A.
Mehrizad
Department of Chemistry, Science and Research Branch, Islamic Azad University, Tabriz, I. R. Iran
author
text
article
2012
eng
This research evaluates the efficiency of nanosized ZnO in the catalytic ozonation of 4-chloro-2-nitrophenol and determines the effect of pH on heterogeneous catalytic ozonation. The combined use of ozone and ZnO catalyst leads to conversion of 98% 4-chloro-2-nitrophenol during 5 min. In addition, it was found that in ZnO catalytic ozonation, the degradation efficiency of 4-chloro-2-nitrophenol was higher at low pH conditions (pH 3.0) than higher pH (pH 7–9). This result was not agreed in the case of ozonation alone, following which higher pH had positive effect on the degradation of 4-chloro-2-nitrophenol. At pH=3, the amount of total organic carbon was 54%. In the degradation of 4-chloro-2-nitrophenol by catalytic ozonation, the high reaction rate constant was obtained in acidic solution.
International Journal of Nanoscience and Nanotechnology
Iranian Nanotechnology Society
1735-7004
8
v.
2
no.
2012
121
126
https://www.ijnnonline.net/article_3917_62cd1a5b64f7f232f4d361082a86d9d3.pdf