Poster Session I

Ref°

Author

Institution

Title

Abstract

E-poster

PP1

A. El Fazazi,a,+  M. Ouakki,a M. Cherkaouia,b

 

a Laboratory of Materials Engineering and
Environment (LMEE), Faculty of Sciences, University Ibn Tofail, BP 133, 14
000 Kenitra, Morocco

b ENSC,
Ecole Nationale Supérieure de Chimie, Ibn Tofail University, B.P 133,
Kenitra, Morocco                                                                  

Electrochemical
Impedance Spectroscopy study of Zinc electrodeposition

Electrochemical Impedance Spectroscopy
(EIS) is a useful technique for ranking coatings, assessing interfacial reactions, quantifying coating breakdown, and predicting the lifetime of
coating/metal systems
[1]. The response of reversible electrochemical systems studied in the presence of an ohmic drop, associated to the experimental setup, unfortunately resembled the response of kinetically slow systems. The best way of differentiating the kinetics of an electrode reaction from experimental side effects is to use an excitation function covering a large time domain. Thus, EIS was used to evaluate the barrier properties of the electrical double layer capacitance and to determine
the polarization resistance
[2]. In the evaluation of impedance data, the electrochemical interphase often is described by an equivalent circuit relevant for the conditions of the experiment, using circuit elements that represent the various physical processes present [3]. In this study, EIS is used to study the corrosion resistance of an electrodeposited Zn coating using different current densities and different pH values for electrodeposition.

PP1

 

PP2

C.M. Samba Valla,b , M.
Chaika,+, H. El Aakiba, S.K. Hnawia, A.Agdada,
A.Mellaloua A.Tchenkaa, M. Aggoura, A. Outzourhita

 

1Laboratory of
Nanomaterials for Energies and Environments, Faculty of Sciences Semlalia,
Cadi Ayyad University, Marrakech 40000, Morocco

2Laboratory of
Renewable Energy and Environment, faculty of Science Kenitra, Ibn Tofail
University PO Box 133, Kenitra. Morocco

 

Influence of RF-power on the optical, structural,
and morphological properties of ZnS:Cr thin films

 

Thin films of undoped zinc sulphide (ZnS) and chromium-doped zinc sulphide (ZnS:Cr) were deposited on glass and Si substrates by radio frequency (RF) sputtering. The time of deposition was set at 90 min, although the RF power varied in the range of 100 to 200 W. The morphological, optical, and structural properties of the grown thin films were investigated. Scanning electron microscopy observations revealed smooth films surfaces. Energy Dispersive Spectroscopy (EDS) revealed that the chromium sputtering rate is
smaller than the Zn and S sputtering rates. The optical properties were examined by optical transmission measurements in the ultraviolet-visible-near-Infrared wavelength range. The specter of X-ray diffraction analysis indicated that all pulverized ZnS films were single-phase with a preferred growth orientation along the (111) plane of the zinc blende (ZB) phase. The Cr-doped films, on the other hand, showed the (111), (2 2 0), and (311) peaks of the same phase .The undoped ZnS films
showed a crystallite size of 25.45nm for a RF power of 200 W. While in the case of ZnS:Cr, the crystallite size increased from 16.6 nm to 28.5 nm. The strain was shown to decrease from 2.2×10-3 to1.45×103. UV-Visible transmission measurements revealed that the ZnS films exhibit an average transmittance on the order of 70 % whilst that of the ZnS:Cr was less than 60 % in the visible wavelength region. The absorption of the doped films was found to
increase with the deposition power. Moreover, the optical bandgap of the ZnS films was found equal to 3.57 eV, this value slightly decreases for ZnS:Cr.
The films thickness increases with the increase of the deposition RF-power.
 

PP2

 

PP3

A. Bendahhoua, M. Abou-Salamab,
P. Marchetc, K. Chourtid, M. Loutoue,f , S.
El barkanye

 

a,b,dLaboratory of Physical Chemistry
of Natural Resources and Environment, Faculty of Sciences Oujda.

cUniversity
of Limoges, IRCER, UMR 7315, Limoges F-87068, France

e,fDepartment
of Chemistry, Faculty Multidisciplinary Nador, University Mohammed Premier
Oujda

 

Synthesis, characterization and study of
the dielectric properties of BZT ceramics: (Ba1-yLn2y/3)ZrxTi1-xO3

BaZrxTi1-xO3 (BZT) ceramics are interestingmaterials to use in the electronicfield as capacitors. They have a high dielectric constant, a composition-dependent Curie temperature and betterstabilitythan Ba1-xSrxTiO3 in the paraelectric state [1-2]. The ceramics (Ba1-yln2y/3)ZrxTi1-xO3were synthesized only by the solid state reactionmethod (with y = 0 and 0.1 x = 0.10, 0.25, 0.50,0.75, 0.90 and Ln = La, Gd, Sm), Infraredspectroscopyanalysis of the
samples prepared reveals considerable stress on the metal-oxygen bond MO (M =Ti, Zr).

PP3

For reasons of confidentiality the poster link has been intensively disabled

PP4

K.CHOURTIa+, M. ABOU-SALAMAa, P. MARCHETb, Y. EL
HAFIANEb, A. BENDAAHOUa and M. KARROUAa.

a Multidisciplinary Faculty of Nador, Department of
Chemistry, Mohammed First University, 60700 Nador-Morocco.

b IRCER UMR7315, CNRS University of Limoges, European
Ceramics Centre
, 12 rue Atlantis, 87068 Limoges Cedex, France.

 

Relationships between crystalline
structure and dielectric properties in Sr2NdxSm(1-x)Ti2Nb3O15
ceramics

 

Because of their interesting dielectric properties and for some of them ferroelectric/piezoelectric properties, the tetragonal tungsten bronze materials (TTB) are used for varied applications
in the field of microelectronic and  microelectromechanical devices, such as
capacitors or actuators and they attracted an increasing scientific interest. The general formula of TTB is (A1)2(A2)4(C)4(B1)2(B2)8O30
[1,2]. In this formula, the (A1) and (A2)
sites are occupied by large monovalent ions (Na+, K+…), divalent ions (Sr2+, Ba2+…) or trivalent ions (Sm3+, Bi3+…). The triangular channels (C) can only contain relatively small ions such as Li+ and are often empty. The (B1) and (B2) octahedral sites contains small and highly charged ions such as Nb4+or Ti4+
[3,4]. In this study, tungsten-bronze type materials of Sr2Sm(1-x)NdxTi2Nb3O15 composition (x=0; 0,25; 0,5;0,75 and 1) were elaborated by classical solid-state reaction. The structural characterization demonstrate that these compounds present tetragonal symmetry, using two space groups P4bm (N°100) and P4/mbm (N°127) respectively. The lattice
parameters are a=b≈12,2
Ǻ; c≈3,8Ǻ; V≈579,03Ǻ
and Z=2.
ρcalc≈5,3g/cm3.
In this compounds, Ti and Nb cations show
obvious off-center displacements along the c axis in both the Ti/Nb(1)O6 and the Ti/Nb(2)O6 octahedra. Besides, the unequal Ti/Nb(2)–O bonds length in the equatorial plane of Ti/Nb(2)O6 octahedra indicates the displacement of the Ti/Nb(2) cations in the (ab) plane, and no displacement of the Ti/Nb(1) cations exists in the ab plane.
The measurements of permittivity and dielectric losses of the ceramic samples performed between 25°C and 700°C (100Hz to 1MHz) high dielectric constants (εr=127~194), and low dielectric losses (tan(δ) around 10-4 at 1MHz). The maximum value of the dielectric constant is obtained for x=0 (εr=194). The Curie temperature Tc decreases from 332 to 246°C as a function of the substitution of the samarium by neodymium. Detailed microstructural analysis by scanning electron microscope (SEM) and (EDS) for this compounds are investigated.

 

PP4

PP5

Z. Aribou,a,+  M. Ouakki,b N. Khammou,
a
M. Galai, a I. Chaouki ,c M.
Ebn Touhami, a

 

a Laboratoire d’Ingénierie des Matériaux et d’Environnement:
Modélisation et Application, Université Ibn Tofaïl, Kénitra.

b Laboratory of materials,
electrochemistry and environment, Faculty of Science, Ibn Tofail University,
PB. 133-14050 Kenitra, Morocco.

c Centre Universitaire d’Analyses, d’Expertise, de Transfert de
Technologies et d’Incubateur (CUAETTI), Université Ibn Tofaïl, Kénitra.

 

 

Imidazole
derivatives corrosion inhibition of mild steel in 1m HCl: electrochemical,
thermodynamical and theoretical calculation

Mild steel is a common material and has found widespread use in many industries. However, its ability to corrode in aggressive environments limits
its application. This study aims to study mild steel inhibition in 1M HCl using two organic compounds, based on imidazole derivatives. Measurements of
weight loss and electrochemical techniques, such as polarization plots and Electrochemical Impedance Spectroscopy (EIS) were used to study their
behavior. Polarization plots revealed that these inhibitors are mixed type with anodic predominance. Thermodynamic parameters were calculated and
analyzed. Surface morphology of the mild steel was characterized by Scanning  Electron Microscopy (SEM) coupled with EDX. Besides, theoretical calculations based on DFT method of level B3LYP / 6-31G (d, p) were realized using Gaussien 09 software which led to a good agreement between experimental and
theoretical results.

 

PP5

PP6

M.Tamoum 1. Mazari 1, N. Benseddik 1, K. Ameur 1, A.
Boumesjed 1, Z. Benamara 1, N. Benyahya 1.

1

Laboratoire de microélectronique appliquée,

Faculté de génie électrique, Université de Sidi Bel
Abbes,

BP89, 22000 Sidi Bel Abbes, Algeria * Address:
BP89 ,22000 Sidi Bel Abbes Algeria

Effect of incorporating two
gate insulators (SiO2 and Al2O3) on the performance of the a-IGZO-based TFT
transistor

 

  In this work we presented the simulation of the effect of the deep defects created by hydrogen on the performances of the thin film transistor of amorphous indium gallium zinc oxide (a-IGZO TFT) by incorporating two gate insulators Al2O3 and SiO2. The results obtained are compared with those obtained by a-IGZO TFT – SiO2.

PP6

PP7

S. Larguech(a), L. Kreit(b), A. Zyane(c), A. Triki(a),
M. El Hasnaoui(b), M.E. Achour(b), A. Belfkira

(c)  (a) LaMaCoP, Faculty of Sciences of Sfax,
University of Sfax, B.P 3018 Sfax

(b) LASTID, Faculty of
Sciences, University of Ibn-Tofail, B.P 133, 14000 Kénitra, Morocco

(c) LCBM, Cadi Ayyad, Faculty of Sciences and
technologies, Av. Abdelkarim Elkhattabi, Marrakech B.P 549, Morocco

 

Effect of microcrystalline Cellulose on dielectric
properties

of latex hybrid composites

 

  Dielectric measurements were performed on
EVA/VeoVa matrix and its hybrid composites reinforced with microcrystalline cellulose (MCC) and multiwalled carbon nanotubes (MWCNT) in the relative weight fraction 9:1. In this dielectric study, the following hybrid composites weight fractions were undertaken : 0.5%, 1%, 2% and 4%. Dielectric spectra were carried out in the frequency range from 10-1 Hz to 10 MHz and the temperature range from -35°C to 140°C. The dielectric analysis at lo wtemperatures of these hybrid composites revealed the effect of MCC on the secondary relaxations namelywet1, wet2 and relaxations. Tmainly originated from the influence of adsorbed water on the local structureand dynamics of cellulose molecules. As at normal environment condition,adsorbed water in cellulose is mostly bound water, this latter could be further categorized as tightly-bound water and loosely-bound water. These latter gave rise to the and relaxations, respectively. The former relaxation appearing at higher MCC weight fraction could be explained by a
higher MCC hydrophilic character. The dielectric analysis at high emperatures of these hybrid composites has shown the presence of theinterfacial polarization effect (MWS), and  relaxations. Analyzing and model allowed probing the reinforcement/matrix interactions in accordance to
weight fraction of the hybrid composites.

PP7

PP8

Sara Rbihi *, a, Abdelkhalk Aboulouard
a, Latifa Laallam a, Ahmed Jouaiti a

 

a. Lab oratory of Sustainable
Development, Sultan Moulay Slimane University, 23000 Beni Mellal, Morocco

Characterization and
Thermal Conductivity of Cellulose

Based cement Composite

 

The elaboration of different samples of
cellulose based cement

composite, derived from orange trees,
while incorporating the

organic filler in cement block for a
potential use in the field of

thermal insulation.

o    The
creation of an insulating material with developedthermal properties and low
thermal conductivity λ.

o    Showing
a certain alliance between the fraction of the fillerand the thermal
conductivity of the sample.

PP8

PP9

Said

Amounas1*, Hassan Chaib1, Khalid Sbiaai2, and
Abdelhakim Nafidi3

Polydisciplinary Faculty of Ouarzazate,
Ibn Zohr University, Morocco

2 Polydisciplinary Faculty of Khouribga,
Sultan Moulay Slimane University, Morocco

3 Faculty of Sciences of Agadir, Ibn Zohr
University, Morocco

Using different DFT implementations for
studying structural, electronic and electrical properties of tetragonal
BaTiO3 and PbTiO3

Structural, electronic, and electrical properties of tetragonal barium titanate (BaTiO3) and lead titanate (PbTiO3) single crystals have been investigated using first principle calculations. We use density functional theory (DFT) as implemented in Quantum Espresso. In our calculations, we consider several DFT implementations (plane waves vs localized basis sets, all electron vs pseudo potential calculations, etc.) in order to figure out which one gives the best results for structural, electronic
and electrical properties of these two ferroelectric oxide materials. The results we obtained, for both materials at room temperature, of equilibrium
lattice constants, equilibrium unit cell volume, electronic band structure, density of states (DOS), gap energy and dielectric constants are in good
agreement with previous experimental and theoretical findings. Furthermore, the spontaneous polarizations of both materials are calculated using the modern theory of polarization. Our calculated values of these polarizations agree well with the corresponding measured values.

PP9

PP10

 

 O. Dagdag1,2*, A. El Harfi2, A. El
Mansouri3, A. Outzourhit4, A. El Bachiri5, M. Ebn Touhami6, L. El Gana7and M.
El Gouri1

 

 1Laboratory of Industrial Technologies
and Services (LITS), Department of Process Engineering, Height School of
Technology, Sidi Mohammed Ben Abdallah University, P.O. Box 2427, 30000, Fez,
Morocco.

2Laboratory of Agroresources, Polymers
and Process Engineering (LAPPE), Department of Chemistry, Faculty of Science,
Ibn Tofail University, BP 133, 14000 Kenitra, Morocco.

3LPSCM, Department of physics, Faculty
of Sciences Semlalia, Cadi Ayyad University, PB, 2390, Marrakech, Morocco.

4Nanomaterials for Energy and
Environment Laboratory, Cadi Ayyad University, PB, 2390, Marrakech, Morocco.

5University Department, Royal Naval
School, Sour Jdid Boulevard, Casablanca, Morocco.

6Laboratory of Materials Engineering and
Environment: Modeling and Application, Faculty of Science, Ibn Tofail
University, Box133-14000, Kenitra, Morocco

7Laboratory of
Optoelectronics, Physical Chemistry of Materials and Environment, Department
of Physics, Faculty of Science, Ibn Tofail University, BP 133, 14000 Kenitra,
Morocco.

 

Electrical Study of a Composite Material
Based on an Epoxy Polymer Containing Cyclotriphosphazene

 In this work, we have prepared, studied,
formulated and characterized the electrical behavior of a composite material based on an epoxy resin Diglycidyl Ether of Bisphenol A (DGEBA) reinforced
with hexaglycidyl cyclotriphosphazene (HGCP). The hardener used is 4,4′-methylene dianiline (MDA). DGEBA-HGCP-MDA epoxy composite materials with
reinforced HGCP which varied from 5 to 10% by weight were prepared by mixing in the molten state. The cured composites have been characterized by various techniques which consist of SEM morphology. The electrical characterization,
this is done with a frequency variation range from 0.1 Hz to 100 KHz at room temperature. These measurements revealed that the electrical behaviors
strongly depend on the quantity of HGCP in the DGEBA matrix. The capacitance-frequency measurements suggest a distribution of the states
located in the forbidden band of the mixtures. Materials as prepared appear to be promising applications in electronic compounds.

PP10

PP11

Z.
Charqui, M. Boukendil+, L. El Moutaouakil, Z. Zrikem, A. Abdelbaki

 

LMFE, Department of Physics, Cadi Ayyad
University, Faculty of Sciences Semlalia B.P. 2390 Marrakesh, Morocco

 

Coupled heat transfer by natural convection and
surface radiation in an open cavity

 

.In recent decades, the heat transfer by natural convection in closed cavities has aroused great interest from scientific researchers [1-2]. This
interest is dictated by the important role played by this mode of heat transfer in many industrial applications. Examples include: cooling of
electronic components, air conditioning, heat exchangers, thermal power plants, storage tanks, nuclear reactors, insulation systems, etc. The
transfer of heat by natural convection in open cavities, however, has not been studied as intensively although this type of cavity is very encountered in reality [3-4].

In this work, the finite volume method is combined with the discrete ordinate method to study numerically the natural convection coupled to
surface radiation in an open cavity filled with air. Two heating modes are considered. In the first mode, the cavity is heated via the wall facing the
opening, while in the second mode, the cavity is heated by its bottom corner (figure).The effect of Rayleigh number and surface radiation on the dynamic and thermal structure of the flow, as well as heat transfer is studied. The obtained results show that there is an effect of the studied parameters and that the cooling of the heated part is better in the case where the cavity is
laterally heated.

PP11

For reasons of confidentiality the poster link has been intensively disabled

PP12

B. Belkacemi,a,bN. Benseddik,a,b,+F.
Boukabrine,aK. Ameur,bH. Mazari,bA. Boumesdjed,bN.Benyahyab, Z. Benamarab.

 

aUniversitéde DjillaliLiabesde Sidi Bel Abbes, Faculté des Sciences Exactes,
Département de Physique, Algérie

bLaboratoire de Microélectronique Appliquée,
Université de Sidi Bel Abbés, Département d’Electronique, Algérie

 

Numerical study of AgInTe2solar cells using SCAPS.

 

The semiconductors ternary (ABX2) show a
much richer of chemical and physical properties [1]. The ternary (ABX2) semiconductors have wide optical band gaps range and motilities of carrier, has led to their appearance importance device materials, including solar
cells of photovoltaic light-emitting diodes [2,3]. In
accordance with this, AgInTe2 solar cells have proved to be the next big advancement in the field of solar energy. In this work, different numerical simulations were performed using SCAPS [4]. The doping density and layer thickness are
investigated under solar illumination of AM1.5 for optimized performance of
solar cell.
Thus starting from I-V curves, we have
calculated the short-circuit current Icc, the
open-circuit voltage Voc, the fill factor and the efficiency
conversion.
This structure can also provide a fundamental
solar cell unit for developing very high efficiency solar cell.

PP12

For reasons of confidentiality the poster link has been intensively disabled

PP13

S. Dlimi1, A. El kaaouachi1,2, L. Limouny1, B. Ait Hamou2 and A.
Echhelh3

1Physics department, University Ibn zohr, Faculty of
sciences, Agadir, Morocco

2MPAC Group, Physics department, University Ibn
zohr, FSA,Agadir, Morocco

3Laboratory of Energetic Engineering and Materials,
University Ibn Tofail

Faculty of Sciences, Kenitra, Morocco

Crossover from VRH E-S to
NNR

VRH in 2D p-GaAs at B=0

We investigate the hopping conductivity
behavior as a temperature in the insulating phase at zero magnetic field and
low temperature. Crossover from a Efros-Shkovskii variable range hopping
(VRH) regime to activated regime have been observed in a GaAs two-dimensional
hole system situated near the interface of a GaAs/AlGaAs heterostructure
grown on a GaAs (311) substrate.  This
conductivity behavior in quantum wells p-GaAs is qualitatively consistent
with the laws laid down by the theories of localized electrons with
interaction. At sufficiently strong interaction, the holes in the localized
states hop collectively.

PP13

PP14

Marouan Karam𝟏, Atika Fahmi𝟏, Ahmed Qachaou𝟏

 

 

 

1-LPMC, Ibn Tofail
University, Faculty of Sciences, Kenitra 14000, BP 133, Morocco

 

Contribution to the study of elementary magnetic
excitations in multilayer Fe/Pt systems

 

The proposed work is a contribution to the study of elementary magnetic excitations properties of the [Fe / Pt] super-lattice. This is done within Heisenberg’s model with localized spins. The corresponding Heisenberg Hamiltonian takes into account exchange, anisotropies and dipolar interactions. The Green’s function technic is used to diagonalize this
Hamiltonian. The excitation spectrum and spin magnetization are, then,
calculated numerically. The adjustment of the obtained theoretical results
with the experimental ones is more than satisfactory. It allowed us to obtain
an estimates bulk and surface exchange integrals values for various magnetic
layer thicknesses.

PP14

 

PP15

R. Hidki, L. El
Moutaouakil, M. Boukendil, Z. Charqui, Z. Zrikem

 

 LMFE, Department of Physics, Cadi Ayyad
University, Faculty of Sciences Semlalia B.P. 2390 Marrakesh, Morocco

 

Natural convection in a
square cavity containing two heat-generating conducting body

 

The cavity with active or inactive square blocks can find applications in several engineering fields. Consequently, a good estimate of the heat transfer inside this type of configuration is important. Many researchers have focused on this problem [1-4]; either from the point of view of the numerical accuracy of the calculation, or from the point of view to improve the thermal behaviour.

The bibliographic review showed that the case of two heat-generating conducting body, in an enclosure cooled by one of these sides, was not dealt with. In this paper, the heat transfer by natural convection in a two-dimensional square cavity containing two heat-generating conducting body (figure) was studied numerically. Two configurations are considered. In the first, the two blocks are placed on the horizontal median of the cavity, while in the second, the blocks are placed on the vertical median. Finite volume procedure based on the SIMPLE algorithm has been used to solve the governing equations. The air motion in the configuration is laminar. The straight wall is cooled uniformly with a constant temperature TC, while the rest of the walls are kept adiabatic. The two blocks generate two uniform volumetric heat generation Q1 and Q2. The effects of parameters, namely, the two Rayleigh numbers, the ratio of the conductivities and the position of the two blocks influencing the flow and heat transfer in the cavity are discussed.

PP15

For reasons of confidentiality the poster link has been intensively disabled

 

PP16

K. Azagar, L. El Moutaouakil, M.
Boukendil+, A. Abdelbaki, Z. Zrikem

 

LMFE, Department of Physics,
Cadi Ayyad University, Faculty of Sciences Semlalia B.P. 2390 Marrakesh,
Morocco

Numerical simulation of
natural convection in partially open cavity with vertical conductive obstacle

 

Heat transfer by natural convection in closed cavities has been extensively studied [1-2].
This  method of heat transfer has a wide range of applications in engineering: cooling of electronic components, air conditioning, etc. However, the heat transfer in open cavities, has not been studied as intensively although this type of cavity is very encountered in reality [3].

Present study has offered numerical investigation for heat transfer coupled by conduction and natural convection and fluid flow in a partially
open cavity containing a vertical conductive obstacle body. The cavity is partially opening in the right vertical wall. The left vertical boundary was isothermal. All the other boundaries are assumed to be adiabatic. The results of this study were obtained for various governing parameters such as the Rayleigh number, varying from103 to 106, the conductivity ratio, the opening and the obstacle positions. The control volume method was adopted for solving the conservation equations, in two dimensional forms, using the SIMPLE algorithm (Semi Implicit Method for
Pressure Linked Equation) developed by Patankar [4]. The results are presented in terms of streamlines, isotherms, velocity profiles, the Nusselt number and the volume flow rate of air through the opening. It is noticed that the results are strongly influenced by the selected parameters.

PP16

 

PP17

S. Taktak(a), H. Hammami(a), S.
Fakhfakh(a), A. Kallel(a), O. Jbara(b)

 

(a) LaMaCoP, Faculty of Sciences of
Sfax, University of Sfax, B.P 3018 Sfax

(b)LISM,
Université de Reims Champagne-Ardenne, Reims 51100, France

Thermal and dielectric
characterizations of Poly(butylene succinate) (PBS) / Polypropylene (PP)

with different blend ratio

 

The main goal of this work is the investigation of the dielectric properties of the immiscible polypropylene/poly(butylene succinate) (PP/PBS) blends. The mixtures were successfully prepared using an internal mixer with different weight ratios of (PP/PBS); (100/0), (80/20), (70/30), (50/50), (20/80) and (0/100). Dielectric spectroscopy of the investigated blends, over a large temperature domain varying between 20 °C and 100 °C and a frequency range from 0.1 Hz to 1 MHz,
was considered to probe the molecular mobility and interfacial transitions of the materials.
Furthermore, the electrical properties (charge trapping, transport and secondary electron emission) were highlighted by submitting the specimens to an electron irradiation of Scanning Electron Microscope (SEM). Thermal study,
using Differential Scanning Calorimetry (DSC), was also performed to further evidence the immiscibility of (PP/PBS) blends. The dielectric permittivity spectra displayed the different intrinsic material relaxations and were perfectly adjusted by the general Havriliak-Negami that permits to well discuss the obtained phenomena. The amount of trapped charge in the (PP/PBS)
blends at the steady state was determined revealing its increase with increasing PBS content.

PP17

 

PP18

L. El Moutaouakil,    M. Boukendil, Z. Zrikem, A. Abdelbaki

 

LMFE, Department of Physics,
CadiAyyadUniversity, Faculty of Sciences Semlalia, B.P. 2390 Marrakesh,
Morocco.

Influence of heat sources/sinks on
natural convection in a differentially heated enclosure

. Natural convection heat transfer in an annulus system was simulated numerically by Lattice Boltzmann Method. The system consists of a differentially heated square cavity filled with water containing isothermal pairs (heat sources/heat sinks) having a circular shape (figure). The analysis is done for different Rayleigh numbers ranged from 103 to 106 and different arrangement of the cylinders inside the cavity to investigate
the effects of these parameters on heat transfer characteristics. The developed code is validated using some thermal natural flows examples:
natural convection in a differentially heated cavity, natural convection inside a square cavity with a heated circular or elliptic cylinder, natural convection in a concentric annulus, natural convection in a triangular cavity containing a heated circular cylinder [1-3].
For the four differents studied arrangement of the circular cylinders (configurations , ,  and ),
the effect of the Rayleigh number on the local and average convective Nusselt numbers are discussed.
The obtained results show that the arrangement of the cylinders inside the cavity considerably affects the heat transfer in the cavity.

PP18

For reasons of confidentiality the poster link has been intensively disabled

PP19

D. Mezdour1, S. Sahli2, M. Tabellout3

 

1 Laboratoire LEM, Université de Jijel, Algérie, 2 Laboratoire de
microsystèmes et instrumentation, Université de Constantine1, Algérie

3IMMM-PEC, UMR
CNRS 6283, Le Mans Université, France

Carrier’s mobility determination in
PS/PANI films

by the potential decay technique

 

Organic electronics has emerged as a new frontier area for flexible printable electronics. Several thermoplastic polymers such as polystyrene (PS) [1], polyvinyl chloride (PVC) [2], polyamides (PA) [3], polyvinyl alcohol (PVA) [4] were combined with Polyaniline salt  to obtain conductive blends with desirable physical properties. Polyaniline (PANI) is an air-stable conducting polymer. Here, an “inert” polymer–polystyrene, was chosen as the matrix polymer to form blends with. This study reports on the electrical properties of Polystyrene/Polyaniline
thin layers investigated by the potential decay technique. Films were first corona charged. Surface potential decay was then recorded versus time using a probe connected to an electrostatic voltmeter. As expected the surface conductivity was enhanced by incorporating only 1 wt. % of polyaniline. This behavior corresponds to an increased conductivity of films according to the
establishment of conductive paths in the PS matrix due to the percolation of the PANI clusters scattered in the PS. Using a model proposed by Perlman et al.[5], a mobility of about 2.2×10-9
m cm2/V.s was obtained. This value is higher than the one reported for polyethylene (10-11 cm2/V.s) [6] and is consistent with the calculated surface conductivity. These results are suitable for antistatic and semiconductive applications.

PP19

 

PP20

El madani Aziz,

 

Ibn tofail university bp 13 Kenitra          

Morocco

aziz.elmadani@uit.ac.ma;

 The temperature effect on the physical properties of PbS nanocrystalline developed by the chemical bath deposition method (CBD)

Thin films of nanocrystallines lead sulfide PbS have been deposited on glass substrates at different deposition temperatures of 30, 40, 50 and 60 °C. The films were synthesized by chemical bath deposition (CBD) an aqueous solution contained lead acetate, thiourea, Tri-sodium citrate and sodium hydroxide. Tri-sodium citrate has been used as
a reducing and stabilizing agent. X-Ray diffraction, UV-vis- NIR-Infared spectrophotometry andscanning electron microscopy were used to investigate
the effect of deposition temperature on the characteristic properties of the PbS thin films. The one hand, X-Ray diffraction measurements have revealed that the increasing in deposition temperature caused the increasing in grains
sizes, and these sizes were found to be between 39.46 to 45.35 nm. In the other hand, the optical band gap Eg decreased from 0.97 eV to 0.87 eV when the deposition temperature increased. This value of Eg can make the material useful in various optoelectronic applications

PP20