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Proceedings of the 4th International Conference on
Nanostructures (ICNS4)12-14 March 2012, Kish Island, I.R. Iran
Abstract Book|INST| Sharif University of Technology|76
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Some issues such as tunneling, leakage currents and light atom pen -
etration through the lm are threatening the ultra thin SiO2 be as a good
dielectric for industrial and electron device and in ceramic technolo-
gies. The zirconium lanthanum oxides nanoparticles prepared by a sol-
gel method. Sol-gel solutions of with Zr atomic fractions of x=0.05 and
0.5 were synthesized. Nanoparticles were characterized using X-ray
diffraction (XRD) and scanning electron microscopy (SEM).
Keywords:High-k; dielectric; Sol-gel; Zirconium-doped lanthanum oxide
A. Bahari*, R. Gholipur, Z. Khorshidi
Department of Physic, University of Mazandaran, Babolsar, Iran
Thermal Behavior of Zirconium-Doped Lanthanum Ox-
ides prepared via Sol-Gel
A nanostructured powder with a uniform distribution of the Ni andCu powders was produced by means of the ball mechanical alloying
treatment (BMAT). Mutual diffusion of Ni and Cu in the nanostruc-
tured layer and the microstructure of the cross section of the remaining
powders were investigated by X-ray diffraction (XRD), scanning elec-
tron microscopy (SEM) and electron probe microanalyzer (EPMA).
The signicantly accelerated diffusion rates are expected to be associ-
ated with the non-equilibrium states of interfaces in the nanostruc-
tured surface layer induced by the ball mechanical alloying treatment
(BMAT). X-ray diffraction patterns revealed that increasing the mill-
ing time gives rise to decreasing the crystallite size and lattice param-
eter during the MA process. Furthermore, scanning electron micros-
copy (SEM) was utilized not only for evaluating the morphology and
microstructure of the remaining powder particles but also for proving
this claim that during MA process, the mutual diffusion of Ni and Cuhas occurred. Elemental mappings also show that the alloying process
occurred in samples but obtaining the uniform shape, size and micro -
structure of the powder requires the increasing of the milling time.
Keywords:Mechanical alloying; electron probe microanalyzer (EPMA);
Mutual diffusion; Nanocrystaline Ni-Cu Solid Solution
I. Farahbakhsha*, A. Zakeriba University of Applied Science & Technology, Shirvan Center, Shirvan,
North Khorasan 96615-197, Iran
In situ Formaon of Cu-Ni Solid Soluon using Ball Me-
chanical Alloying Treatment (BMAT)
The adsorption behavior and micellar properties mixed binary ion-
ic/ionic surfactants containing cetyltrimethylammonium bromide
(CTAB) and sodium dodecyl sulfate (SDS) in aqueous mixture of
ethylene glycol (EG) have been investigated by surface tension, con-
ductometry, pulsed eld gradient nuclear magnetic resonance, trans-
mission electron microscopy, and cyclic voltammetry measurements.
Co-solvent effects on the interactions between the two surfactants
CTAB and SDS were analyzed on the basis of regular solution theory,
both for mixed monolayers at the air/liquid interface () and for mixed
micelles (M). It was shown that an excess of cationic surfactant re-
sulted in the formation of nonspherical vesicles. These were predomi-
nantly nanorod vesicles in water_EG mixed solvents. The interparticle
interactions were assessed in terms of cosolvent effects on the micellar
surface charge density, the sphere-to-rod morphology change, and the
phase transition from vesicles to mixed micelles. Moreover, the varia-
tion of the repulsive electrostatic potential energy between two pairs ofaggregates was investigated for two modes of nanostructural transition,
namely the transition between spherical and rod-like micelles and the
transition between rod-like micelles and nanorod vesicles.
Keywords: Phase transition; Mixed micelle; CTAB; Sodium dodecyl
sulfate; Nanostructure
A.Yousef, S. Javadian*
Department of Chemistry, University of Tarbiat Modares, Tehran 14115-
117, Iran
The Co-Solvent Eect on Nanostructures of Mixed Cat-
ionic and Anionic Surfactants
Studies on the synthesis and formation mechanism of zirconia
nanopowder prepared by mechanochemical method from a dry powder
mixture of anhydrous ZrCl4 and CaO have been carried out. According
to our results, ZrCl4 hydrolyses during the heating stage while CaO
adsorbs the produced HCl forming CaClOH and CaCl2 subsequent-
ly. Heat treatment of Zr(OH)4 resulted in the production of zirconia
(ZrO2). Based on Rietveld renement it has been shown that an aver-
age critical crystallite size around 46 nm exists above which tetragonalzirconia (t-ZrO2) transforms to monoclinic zirconia (m-ZrO2).
Keywords: Mechanochemical synthesis; Zirconia; Formation mechanism;
Phase transformation; Rietveld renement
T. Dallali Isfahania, b, *, J. Javadpoura, A. Khavandia, R. Dinnebierb, H. R.
Rezaiea, M. GoodarziaaSchool of Metallurgy and Materials Engineering, Iran University of Science
and Technology (IUST), Narmak, 16844 Tehran, IranbMax-Planck Institut fr Festkrperfoschung, Heisenbergstrasse 1,
D-70569 Stuttgart, Germany
Formaon Mechanism of Zirconia Nanoparcles Pre-
pared from ZrCl4 and CaO
b School of Materials Engineering & Metallurgy, Iran University of Science
& Technology, Tehran 16846-13114, Iran
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In this work, Nickel sulde nanoparticles powder was synthesized in
AlMCM-41 molecular sieve by using ion exchange method. Sample
was irradiated by Am-Be neutron source up to uencies (7.9*109 n cm-
2) to study neutron radiation effecton physical properties of prepared
nanoparticles .The sample was characterized by X-ray diffraction
(XRD), UV-Vis spectroscopy, scanning electron microscopy (SEM)
and Fourier transform infrared spectroscopy (FT-IR) techniques. The
results show that in the neutron irradiated sample, nanoparticle size
D. Rezaei Ochbelgha, N. Morsali Golboosa*, Sh. Sohrabnezhad b, M.
Kashef Biroona
aDepartment of Physics, University of Mohagheg Ardebily, Ardebil 179, Iranb Department of Chemistry, University of Guilan, Rasht, Iran
Reduce Aggregaon of NiS Nonoparcles Incorporated
in AlMCM-41 Materials by Neutron Radiaon