Poster Session II

Ref°

Author

Institution

Title

Abstract

E-poster

PP21

N. Khemmoua,*, Z. Aribou a, I. Chaouki b, R.A. Belakhmima b, M. Ebn
Touhamia

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

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

Design of experiments for modeling and
optimization of nickel electrodeposition process

Nickel deposition on brass is a technique widely used in various industrial activities. Nickel-plating using the watt bath is frequently used because of the appearance and stability of the deposit over time. However, deposition processes are relatively complex and depend on several factors such as pH, temperature and bath composition. In order to improve the quality of this electroplating on brass, the central composite experimental design and response surface methodology were used for the modeling and optimization of this process. The proposed deposition bath is a nickel bath mixed with an organic additive: but-2-yne-1,4-diol

Multivariate regression models developed with two
controllable input variables, namely the influence of the organic additive concentration and the temperature of the treated bath; and the influence of bath temperature and pH were found to be statistically significant in predicting nickel electroplating responses, such as brightness, hardness and average thickness of the deposited layer. The main and interaction effects of the input variables on the process outputs were investigated by graphical representation of the response surfaces using 3D plots and 2D contour maps.
The models were statistically validated by an analysis of variance (ANOVA) which revealed acceptable coefficients of determination. Modelling and optimization of the experiments was carried out by the JMP® software.

PP21

For reasons of confidentiality the poster link has been intensively disabled

PP22

A. Nayad
a,+, A. Hasnaoui b, S. K. Hnawi a,b,
L. Fkhar a,c, Y. Hadouch d, D. Mezzane d, L. El firdoussi a, M. Ait
Ali a

a Laboratoire de Chimie de
Coordination et Catalyse, Université Cadi Ayyad, BP 2390, 40001, Marrakech,
Morocco.

b Laboratory of Nanomaterials, Energy and
Environment (LNEE), Cadi Ayyad University, BP 2390, 40001, Marrakech, Morocco.

c Materials and Nanomaterials Center,
MAScIR Foundation, Rabat, Morocco.

d Laboratoire de la Matière
condensée et Nanostructures, Université Cadi Ayyad, BP 2390, 40001,
Marrakech, Morocco.

CaSi2: a
promising material for the synthesis of novel functionalized two-dimensional
crystalline silicon nanosheets

Among the variety of 2D materials, Silicene Nanosheets (SiNSs) having nanometers thicknesses and lateral dimensions ranging from the submicrometer to the micrometer scale has become a great challenge. Calcium disilicide (CaSi2) Zintl phase is by far the precursor material used for the preparation of SiNSs via topochemical deintercalation of calcium by thermal treatment with metal chlorides [2] and by soft chemical exfoliation in the presence of K or I2 as redox-assistants [3,4]. However, the synthesized silicene are highly unstable under ambient conditions and are prone to random oxidation and surface attachments, which make difficult its potential utilization. Thus, the surface functionalization of SiNSs, expected to provide stable materials in air-ambient, has been recently explored lately by modifications of layered polysilane Si6H6 with organic compounds [5,6]. However, no crystalline phase was reported.

In this work, we introduce an easy and direct functionalization approach of novel stable crystalline SiNSs by exfoliation of CaSi2 with alkyl halides. For the first time, the dielectric proprieties of such bi-dimensional silicon-based materials were evaluated.

PP22

PP23

A.
Bougharouata

Université Akli Mohand Oulhadj de Bouira, Faculté des Sciences et des
Sciences Appliquées, Département de Génie Electrique, Bouira 10000, Algeria

 

A comparative study on the effect of corona discharge and dielectric
barrier discharge treatment on polypropylene films

In many polymer applications, hydrophobicity and
barrier properties are of great interest in recent years. These applications include packaging films, electrical cables, textiles, non-woven materials, flat panel displays and corrosion protection [1-2]. Polypropylene films (PP)
have been used today in many applications because of their good physicochemical and electrical properties, including high mechanical strength, low dielectric constant and good thermal stability and chemical resistance [3-4]. The study of surfaces properties of Polypropylene films after their exposure to an electric discharge (corona discharge and dielectric barrier discharge) has been investigated. The study of the effect of the treatment by corona and dielectric barrier discharge on polypropylene films surface was carried out by the study of the evolution of the surface energy through the measure of the contact angle and by chemical analysis
through FTIR/ATR spectroscopy. Surface energy and its components are calculated using the Owens and Wendt model. The results show that the corona discharge treatment induces a rapid reduction in the contact angle compared to that recorded with the dielectric barrier discharge treatment. The decrease in the contact angle with the treatment time and with the increase in the applied voltage of the discharge and therefore an increase in surface energy due to the increase in its polar component is explained by the fact that the treatment by induces a modification of the polypropylene surface resulting in an increase in the properties hydrophilic film (better adhesive properties). The discharge produces activated neutral species reacting with the surface of the sample to create functional functions responsible for wettability [5]. The FTIR/ATR spectroscopy analysis revealed the appearance of hydroxyl (-OH) and carbonyl groups (C=0), the intensities increase with increasing peak voltage. These groups induce an improvement in the surface wettability properties.

PP23

PP24

 

Djaaboube Halima,

 

Université de Constantine Algérie , Constantine, Algeria halimadjaaboube@gmail.com;

 

 


 

Structural and optical properties of transparent magnesium oxide thin film

 

 

 

 

MgO thin films were prepared on glass substrates by a simple sol-gel method (dip-coating) using magnesium acetate tetrahydrateMg(CH3COO)2.4H2O as precursor. Solutions of 1.5M, 1.1M and 0.7M consist of magnesium acetate dissolved in methanol with addition of few drops of nitric acid. The aim of this work is the study of the effect of concentration and annealing temperature on optical and structural properties of MgO dielectric TCO thin films. The microstructure and optical properties of resulting thin films were investigated by the X-ray diffraction, the Fourier transformed infrared spectroscopy (FTIR), the force atomic microscope (AFM) and the UV-Vis transmittance techniques. The analysis shows that obtained magnesium oxide thin films crystallize in cubic structure for all specimens. The MgO the optical gap of MgO thin films increases with the
decrease in concentration from 2,81 eV to 3,74 eV for 1.5M and 0.7M respectively. Moreover, the band gap decrease with increasing of annealing temperature.The transmission of layers varies respectively between 80 and 90%
for samples of low concentrations 0.7 M and 1.1 M where is lower (~ 50%) for the high concentration 1.5 M.The MgO absorption peaks are expected in the range of 400-600cm-1 region which are associated with the longitudinal optical (LO) phonon modes of MgO lattice.

PP24

For reasons of confidentiality the poster link has been intensively disabled

PP25

V.
Ilchevaa, V. Boeva, M. Dimitrovaa, E. Lefterovaa, T. Petkovaaa

 

Institute of Electrochemistry and Energy
Systems, Bulgarian Academy of Sciences,

Acad. G. Bonchev str. bl.10, 1113 Sofia,
Bulgaria

Оrganic – inorganic hybrids, obtained by
sol-gel approach at different inorganic catalysts

Urea-cross-linked polyether-siloxane hybrids with different length of polymer segments were synthesized through a
sol-gel process uses ethanol as a solvent. The longer polymer chain hybrid was prepared from a monomer obtained by reaction of 1 mol of 3-(isocyanatopropyl) triethoxysilane (ICPTES) and 2 moles of double polyetheramine (Jeffamine) and that of a shorter chain – from a monomer, obtained by reaction of 1 mol of ICPTES and 1 mol of 3-aminopropyl triethoxysilane (APTES). Several inorganic acids were tested as catalysts for initiation of hydrolysis and condensation
of the modified alkoxysilane monomers.

The prepared samples were characterized by X-ray diffraction (XRD), FTIR and Scanning Electron Microscopy (SEM). It has been established that structure of the materials is influenced not onlyby the composition of the monomer, but also by the type of the catalyst. An important point is the presence of OH and H-O-H bonds in the structure, which is a prerequisite for good ionic conductivity of the materials.

The present study provides that the incorporation these acids as active ingredients is perspective for fabrication of proton conducting polymer membranes for hydrogen fuel cells operating in the low temperature range.

PP25

PP26

A. Benlalli

Radiation Physics Laboratory, Physics
Department,University BadjiMokhtar-Annaba

Annaba, Algeria

Study of
spinel ferrite by ResonantNuclear

ScatteringManganese-Iron
notstoichiometric

The Resonant Nuclear Scattering has revealed the directional order that forms in the spinelferrites due to
anisotropic distribution of Fe2+ and Fe3+ to the local
direction of magnetization. We undertook to conduct a study on ferrites of composition: 
= vacancies,

These compounds are then called lacunar spinel’s. Generally the gaps are located in the octahedral sites, however their presence in tetrahedral sites is reported. For example, the oxidation of Fe3O4 magnetite leads to the formation of γ-Fe2O3 and to the appearance of cationic vacancies according to the following charge equilibrium:

3 Fe2+ → 2 Fe3+.The spectra were made on two kinds of samples: quenched and slowly cooled at different temperatures. The results show that it is possible to possible to distinguish at least three sites according to the values ​​of 𝛼: an octahedral site (O) occupied by the Fe3+and Mn2+ions, which will be designated by (Fe3+)O(Mn2+)O,a tetrahedral site (T) or (Fe2+)T, and a tetrahedral site (T) or (Fe3+)T. The variation of intensity of the octahedral site according to 𝛼, and the differences of variation according to the cooling conditions suggest the existence of a partial order among the nearest neighbours of the site (Fe3+)O of an ion (Fe3+)T,
which will make good account of the directional order.

PP26

PP27

F. Meriche,a,+ N. Mahamdioua,b,+ I. Belal,a S.P.
Altintas,c N. Soylu,c C. Terzioglu,c

aLEM, Department of Physics, Mohamed
Seddik Ben Yahia University, Jijel, Algeria

bLEND, Faculty of Science and Technology,
Mohamed Seddik Ben Yahia University, Jijel, Algeria

CDepartment of Physics, Faculty of Arts
and Sciences, AIB University, Bolu14280, Turkey

Structural and Magnetoelectrical properties of
La0.6Y0.1Ba0.2Sr0.1MnO3 manganite

Perovskite manganite compounds with stoechiometric formula ABO3 (A: Lanthanum and B: manganese), have drawn significant interest for use in resistive switching devices, magnetic information store, solid oxide fuel cells, reduction catalyst, spintronic and biomedical applications. These materials possess a variety of fascinating electronic and magnetic properties [1, 2]. In this work, we explore the
structural, microstructural, electrical and magneto-transport properties of La0.6Y0.1Ba0.2Sr0.1MnO3 perovskite manganite elaborated by the solid state reaction process. Crystal structure and phase purity of the obtained compound
were analyzed via X-ray diffraction (XRD). The recorded diffractogram refined by Fullprof program demonstrate that La0.6Y0.1Ba0.2Sr0.1MnO3 compound was crystallized in a single phase orthorhombic structure with the space group
Pnma (62). Scanning electron microscope (SEM) analysis shows that the LYBSMO sample is constituted from square-shaped grains with distinguishable grain boundaries. Energy-dispersive X-ray spectroscopy (EDS) analysis approves the
high purity of our compound and confirms the presence of all the constituent elements. Temperature dependence of electrical resistivity in the range 20-300 K is carried out by the standard four probe technique. Both zero and 1 tesla applied magnetic field curves exhibit a metal-insulator transition around 240K. The applied magnetic field decreases the resistivity values in the entire temperature range indicating the magnetoresistive character of the studied sample. The electrical resistivity curves show an upturn at very low temperature. It is getting at 30K and shifts to the lower temperature with applying one tesla magnetic field to 23 K. Fitting the resistivity curves in the metallic regime (T<135K) revealed that the conduction is governed by the contribution of the residual resistivity, the weak localization interaction and the electro-electron interaction. No electron-phonon interaction was detected.

PP27

PP28

S.
Zaima, b, +, R. EL Mozninea*, R. Nmilab, H. Rchidb

a Laboratory Physics of Condensed Matter (LPMC).
University Chouaib Doukkali, El Jadida, Morocco.

bLaboratory of Biotechnology and Valorization of
Vegetal Resources. University ChouaibDoukkali, 24000, El Jadida, Morocco.

 

Electrical
impedance spectroscopy (EIS) as a tool to investigate the complexation
process of Gum Arabic and Chitosan solution: a review

Electrical impedance spectroscopy is a powerful technique to investigate the electrical properties of a large variety of materials. This technique has been used by Yadav et al. [1] to
study the complexation process between gum Arabic and chitosan in bulk solution. EIS data were obtained for different mass ratios (RGA/Ch) at frequencies ranging from 1Hz to 1000 Hz. Randles circuit was used to fit experimental data and to estimate resistance and capacitance parameters as a function of RGA/Ch. These parameters showed sharp changes at the isoelectric point of the complex coacervates. The capability and accuracy of the EIS were compared with that obtained via traditional potential measurements. The
results indicated that the EIS technique can be used at specific frequency ranges as a practical method for monitoring the complexation process between biopolymers.

However; it seems that the analysis of the impedance data was limited only to the complex impedance function. Therefore; this paper presents a review for a deep investigation on various electrical properties such as complexes impedance; modulus; admittance and capacitance.
In this study; a simulation was performed in order to generate impedance complex data using electrical parameters extracted from the equivalent circuit since this latter showed a good fit for the experimental data.
Moreover; an extrapolation in the low-frequency region was carried out to further investigate the behavior of the relaxation and the diffusion process.
The analysis of impedance data using the bode plot allowed us to the identification and the de-convolution of a different process. Other electrical functions such as complex conductivity and permittivity were investigated using the Bode plot to further investigate the different processes. This review could provide considerable information about the user
and guidance for the analysis of various electrical complexes functionsas well as for monitoring the complexation process between biopolymers.

PP28

PP29

Y.
Niouaa, B. M. G.Melob, P. R. Prezasb, M. E. Achoura, M. P. F. Gracab, L. C.
Costab, A. Fattoumc

a LASTID Laboratory, Department of Physics, Sciences Faculty,
University Ibn Tofail, BP 133, 14000, Kenitra, Morocco

bI3N and Physics Department, University of Aveiro, 3810-193 Aveiro,
Portugal

cResearch Unit of Materials, Environment
and Energy, Sciences Faculty of Gafsa, 2112 Gafsa, Tunisia

Electrical studies of reduced graphene oxide/epoxy                                            polymer nanocomposites

In this work, we present an analysis of the d.c. and a.c. electrical conductivities of a composite material synthesized by mixing reduced graphene oxide (rGO) particles in an epoxy resin polymer (DGEBA), in the 240 to 400 K
temperature range and 102 to 106 Hz frequency [1]. We
found that the d.c. electrical conductivity of the samples is strongly related to the rGO content, indicating a percolating behavior, with a critical percolation threshold, 
 
4 %. The critical behavior of the d.c. electrical conductivity as a function of the temperature indicates a strong positive temperature coefficient (PTCR) and a negative temperature coefficient (NTCR) [2] of resistivity, below and above the transition temperature Tg, respectively. Moreover, the
results showed that the d.c. conductivity obeys the Arrhenius law and the a.c. electrical conductivity is both frequency and temperature dependent and follows the Jonscher’s power law.

PP29

PP30

B. Jamal, M. Boukendil*, L.
El Moutaouakil, A. Abdelbaki

 

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

Numerical
simulation of combined heat transfers through hollow bricks wall

The present study aims to investigate coupled heat transfer by natural convection, conduction and surface radiation through hollow bricks wall. The outside vertical surface is submitted to an incident solar flux and outdoor environment temperature while the inside surface is submitted to indoor
environment temperature. The effects of the incident solar flux, the thermal conductivity and emissivity on the heat transfer through the considered structure were examined. The results show that the thermal conductivity and emissivity have a strong impact on the overall heat transfer through the
wall. the use of hollow bricks with low thermal emissivity and low conductivity of solid walls, which will greatly help in reducing the energy consumption in buildings

PP30

PP31

Z. El Ansarya, I.
Bouknaitira, S. S. Teixeirab, L. Kreita, A. Pannielloc, P. Finic, M.
Striccolic, L. C. Costab, M. E. Achoura,+, M. El Hasnaouia

a LASTID Laboratory, Physics Department, Faculty of
Sciences, Ibn Tofail University, B.P:133, 14000, Kenitra, Morocco.

bI3N and Physics Department, University of Aveiro,
3810-193 Aveiro, Portugal.

cCNR-IPCF-Bari Division, c/o Chemistry
Department, University of Bari, Via Orabona 4, 70126, Bari, Italy

Studies on the Electrical and Thermal
properties of PMMA/Carbon-dots nanocomposites

Studies of thermal and electrical properties of original nanocomposite materials, based on poly(methyl
methacrylate) loaded with synthesized colloidal carbon dots nanoparticles were performed. Differential scanning calorimetry allowed to identify the glass transition temperatures of heating and cooling which decrease with
carbon-dots nanofillers concentration, showing a plasticizing effect on the polymer structure. The frequency dependent of AC electrical conductivity
shows a change in behavior at a specific frequency, which was modeled using the Jonscher’s power law. The Nyquist representation of the electric modulus
permits to identify two dielectric relaxations.  The first one, appearing at low-frequency domain, was attributed to the Maxwell–Wagner–Sillars polarization whereas the second one, appearing at high-frequency domain, was associated to the α-relaxation contributed by
main-chain movements in PMMA polymer.
The activation energies calculated from the electrical conductivity and relaxation processes were calculated using the Arrhenius equation.

PP31

PP32

Y. El Hasnaoui, T.Mazri

 

Electrical System and
Telecommunication Engineering, National School of Applied Sciences, Ibn
Tofail University; Kenitra, Morocoo

Design the antenna with new dielectric
substrate for new generation (5G)

Recent research has shown that choosing the right substrate for dielectric materials can enhance the antenna performance for the next generation of wireless communications. In this work, we presentthe results of the comparative studies on the performances of the microstrip antennas for the new generation (5G) based on specific characteristics of a dielectric substrate. The main objective of this work is to choose the best properties of a dielectric material to design antennas with the best characteristics. The results obtained are discussed and the performance comparison (gain, bandwidth, directivity and radiation pattern) of a rectangular patch antenna is established in order to show the effect of certain parameters of the antenna on its characteristics.

PP32

PP33

A. EL KaaouachiA, S. Dlimi a

.

a Physics Department, University Ibn Zohr, Faculty of Sciences, B.P
8106, Hay Dakhla, 80000 Agadir, Morocco

Phase transition in high-mobility Si MOSFETs

L. LimounyA,+,

We study the electrical conductivity of highmobility Si-MOSFETs, in the vicinity of the critical carrier density nsc
of the metal-insulator transition where nsc ≈ 0.72 x 1011
cm-2. Around nsc
onboth sides of the metal-insulator transition, the conductivity shows strange linear temperature
(T) dependence. Analysis of data of the extrapolated conductivity from the linear T dependence at T = 0K σ0 as a function of the carrier density nsreports existence of two
modes with different σ0(ns) dependence. This result demonstrateexistence oftwo different phases. A severe
transition between these two regimes occurs at nsc.
We suggest the existence of a possible phase type of transition in these Si-MOSFETs.

PP33

PP34

N. Ariboua,+, S. Barnossa, Y. Niouaa, M. El
Hasnaouia, M.E. Achoura, L.C. Costab

 

a LASTID Laboratory, Physics Department,
Faculty of Sciences, Ibn Tofail University, BP 133, 14000 Kenitra, Morocco

Structural,
electrical, and impedance spectra analysis of PMMA/PPy composite materials

 

Structural characterization and dielectric properties of poly(methylmethacrylate)/polypyrrole composites were
performed. The results of X-ray diffraction permitted to calculate the crystallinity index, showing a remarkable increase with filler concentrations.
The impedance spectra and electrical conductivity of the composites, for filler fractions above the apparent percolation threshold, were analyzed using Cole-Cole modeland Jonscher power law, respectively, in the frequency range from 100 Hz to 1 MHz and temperature from 290 to 380 K. The dependence of temperature of bothn and α exponents give an idea about the
transport mechanisms related to these composites. Whereas, the variation of DC conductivity and relaxation time as a function of temperature were analyzed
using the Arrhenius equation, showing the thermal activated process.
 

PP34

PP35

Structural,
optical, dielectrical and electrical properties of

Aloe
Vera leaf exudate:

L.
Nkhailia, L. EL Firdoussib, A. Oueriagliaand M. Ait Alib, +

 

 

a Laboratory of Nanomaterials, Energy
and Environment (LNEE), Cadi Ayyad University, Faculty of sciences Semlalia
(UCA-FSSM), B.P. 2390 – 40000 Marrakech, Morocco.

b Coordination Chemistry Laboratory
(LCCC), Cadi Ayyad University, Faculty of sciences Semlalia

(UCA-FSSM),
B.P. 2390 – 40000
Marrakech, Morocco

c Laboratoire
des Sciences des Matériaux Inorganiques et Leurs Applications, Faculté des
Sciences

Semlalia (UCA-FSSM), B.P. 2390 – 40000 Marrakech, Maroc.

Application
as natural dye in solar cell

S.
K. Hnawia,b, A. Nayadb, H. Aitdadsa, A. Agdada,M.Afqirc, 

 

In this study, the Aloe vera leaf exudate as yellow-orange solid (EAS) collected from the leaves of Aloe Vera plant
(aloe barbadensis miller) was used as a cheap and natural sensitizer thin film to build a planar heterojunction solar cell with zinc oxide (ZnO) thin film as an electron selective layer. Optical and structural properties of the films were analyzed using X-ray diffraction, UV-Vis absorption and Fourier
Transform Infrared (FT-IR) spectroscopy. Dielectrical properties were analyzed by impedance spectroscopy. The ZnO/EAS solar cell was fabricated by direct deposition of silver (Ag) contacts on the EAS films. The band gap was
found to be 1.88 eV. The electrical properties of the cells investigated by current– voltage (I–V) measurements showed an important open circuit voltage (Voc) of 0.74 V and a great fill factor (FF) of 0.70.

PP35

PP36

R. Belhimriaa, S.
Boukheira,b, Z. Samira, A. Lenc,d, M. El Hasnaouia,+, M.E. Achoura, N. Ébere,
L.C. Costaf, A. Oueriaglib

aLASTID Laboratory, Physics Department, Faculty of Sciences, Ibn-Tofail
University, BP 133, 14000 Kenitra, Morocco.

bLaboratoire LN2E, Faculté des
Sciences, Université Cadi Ayyad, B.P. 2390, 40000 Marrakech, Morocco

cNuclear Analysis and Radiography Department, Centre for Energy
Research, H-1525, Budapest, P.O.Box 49, Hungary

dCivil Engineering Department, Faculty of Engineering and Information
Technology, University of Pécs, BoszorkányStr 2, 7624 Pécs, Hungary.

eComplex Fluids Department and Neutron Spectroscopy Department,
Institute for Solid State Physics and Optics, Wigner Research Centre for
Physics, H-1525, Budapest, P.O.Box 49, Hungary

fI3N and Physics Department, University of Aveiro, 3810-193 Aveiro,
Portugal

 

SANS
characterizationand impedance spectra analyses of polyester/graphite
composite

This work presents a study on the electrical and structural properties of composites based on graphite dispersed into a
polyester matrix. Their structural characterisation was performed using  small-angle neutron scattering (SANS), providing information about the dispersion of fillers within the matrix. Electrical measurement was carried out in the frequency range from 1 Hz to 10 MHz and temperature from 30 to 100 °C.It was found that when the filler concentration is above the percolation threshold, the positive temperature coefficient in resistivity phenomena is identified.The mechanism responsible for this behavior was attributed to the
tunneling effect. The Nyquist representations of the complex impedance spectra were modeled using the Cole-Cole model. The obtained values of the α exponent that gauges the broadening of the loss spectrum are near zero, suggesting a behavior close to a model of a single relaxation time. Furthermore, the relaxation time versus temperature follows an Arrhenius behavior.
 

PP36

PP37

Z. Samira,+, R.
Belhimriaa, S. Boukheira,b, S. SoretoTeixeirac, M.E. Achoura, A.
Anson-Casaosd, M.El Hasnaouia, L.C. Costac, A. Lene,f, J.M.
Gonzalez-Dominguezd

aLaboratoire LASTID, Faculté des Sciences,
Université Ibn Tofail, B.P. 133, 14000 Kénitra, Morocco

bLaboratoire LN2E, Faculté des Sciences,
Université Cadi Ayyad, B.P. 2390, 40000 Marrakech, Morocco

cI3N and Physics
Department, University of Aveiro, 3810-193 Aveiro, Portugal

dInstituto de
Carboquímica ICB-CSIC, Miguel Miguel Luesma Castán4, 50018 Zaragoza, Spain

eNuclear Analysis and
Radiography Department, Centre for Energy Research, H-1525, Budapest,
P.O.Box 49, Hungary

fCivil Engineering
Department, Faculty of Engineering and Information Technology,
University of Pécs, BoszorkányStr 2, 7624 Pécs, Hungary

 

T Thermal
and dielectric behaviorof ternary composites Carbon
nanotubes/Graphite/Polyester

Ternary composites composed of a polyester matrix were synthesized with the combined inclusion of two types of fillers, namely, multi-walled carbon nanotubes and
graphite.
Thermal analysis was performed, using
thermogravimetric analysis
and differential
scanning calorimetry, which allowed us to observe changes in the glass
transition temperatures and degradation temperatures of the composites. Electrical and dielectric measurements were carried out in a frequency range from 100 Hz to 1 MHz and temperatures from -33 to 107 ºC.
The dielectric response was analyzed using the electrical modulus
Cole-Coleformalism, depending on the temperatures and on the concentration of filler in the polymer matrix.

 

PP37

PP38

S. Barnossa, B. M. G. Melob, M. El Hasnaouia, +,
M.E. Achoura, L.C. Costab, M.P.F. Graçab,

                           

 

a LASTID, Department of
Physics, Faculty of Sciences, University Ibn Tofail, BP 133, 14000 Kenitra,
Morocco

b I3N and Physics Department,
University of Aveiro, 3810-193 Aveiro, Portugal

Electrical
and Dielectric Properties of Gt/CNT/Engine Oil Nanofluids

Studies on the electrical and the dielectric properties of nanofluids based on commercial engine oil loaded graphite (Gt) and carbon nanotubes (CNT) nanoparticles have
been performed. The electrical conductivity and impedance spectra were measured in the frequency range from 100 Hz to 1 MHz and temperatures from 300 and 400 K using impedance spectroscopy. The frequency-dependence of the
electrical conductivity is analyzed using the Jonscher’s power law and the Nyquist representations of the complex impedance spectra are modeled using the Cole-Cole model. The results suggest that the presence of the nanotubes
greatly affect the dielectric properties of the oil as a result of polarization phenomenon induced by these nanoparticles. The temperature dependence of both DC conductivity and relaxation process behaviors, using the Arrhenius equation indicates that the conduction processes is thermally activated.

 

PP38

PP39

B. A.
Hammoua ,A. El kaaouachia,+ , A. El Oujdi b, A.  Echchelhb , S. Dlimic

aMaterials
and Physicochemistry of the Atmosphere and Climate Group, Faculty of Sciences
of Agadir, BP 8106, 80000 Agadir, Morocco

b
Laboratory of Energetic Engineering and Materials, Faculty of Sciences Ibn
Tofail, Kenitra, Morocco

cPhysics
Department, Faculty of Sciences of Agadir, BP 8106, 80000 Agadir, Morocco
.

 

Analysis of the dielectric function of
Aluminum (Al) in bulk and nanometric states.

 

In this work, we model the dielectric function of Aluminum (Al). The modeling has been performed on Al in bulk and
in nanometric states. The dielectric function is presented as a complex number with a real part and an imaginary part. First, we will model the experimental measurements [1] of the dielectric constant as a function of the pulsation ω by appropriate mathematical functions in an explicit way. In the
second part we will highlight the contributions to the dielectric constant value due to intraband and interband electronic transitions. In the last part of this work we model the dielectric constant of this metal in the nanometric
state using several complex theoretical models such as the Drude Lorentz theory [2] and the Drude two-point critical model [3]. We shall comment on which model fits the experimental dielectric function best over a range of
pulsation.

PP39

PP40

S.Khardazi a , D.Mezzane a , Y.Gagou
b , M.Amjoud a ,S.Ben moumen a ,S.Belkhadir a

a Laboratoire de la matière condensée
et nanostructures LMCN, F.S.T.G. Université Cadi Ayyad, BP 549, Marrakech,
Morocco

 b Laboratoire de
physique de la matière condensée LPMC, Université Jules Verne de Picardie, 33
rue Saint-Leu, 80039 Amiens Cédex, France

 

Structural,
dielectric and impedance spectroscopy analysis of lead free
(Ba0,85Ca0,15Zr0,1Ti0,9O3) ceramics synthesized by sol-gel method

 

In recent decades, there is an increasing attention paid to ferroelectric and ecological materials, both in scientific research and technology developments. In the present work, a lead free ceramics Ba0,85Ca0,15Zr0,1Ti0,9O3 (BCZT) was prepared by sol-gel method. Morphological and structural
properties of BCZT were investigated by SEM and XRD technique confirmed by Raman spectroscopy at room temperature, respectively. Dielectric characteristics were analyzed by Impedance spectroscopy. Rietveld refinement
indicates the formation of a single phase compound with a tetragonal structure of space group P4mm. The ceramics sintered at 1350°C exhibits a dense microstructure. The dielectric measurements of BCZT were studied as a
function of temperature in the frequency range of 100Hz-500 kHz. The variation of dielectric constant (ε’) shows a maximum value of ~4700 at the ferroelectric-paraelectric phase transition (Tc= 64°C). The Diffuse nature of the transition is well described by Santos–Eiras
phenomenological model. Impedance spectroscopy analysis over the frequency range of 100Hz to 500 kHz presents mainly grain and grain-boundary contribution above 266°C.

PP40

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