
Mohamed El HasnaouiIbn Tofaïl University · Department of Physics
Mohamed El Hasnaoui
Ph.D.
Professor and Scientific researcher in the field of dielectric and magnetic hybrid materials
About
50
Publications
22,889
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
447
Citations
Introduction
El Hasnaoui M. is a professor (Full) at Ibn-Tofail University in the Faculty of Science, Department of Physics, in Morocco. He is also a researcher at the Laboratory of Material Physics and Subatomic. His research interests mainly focus on studying the electrical, thermal, dielectric, and magnetic properties of hybrid materials and nanocomposites.
Additional affiliations
March 2014 - December 2018
Université Ibn-Tofail, Faculté des Sciences.
Position
- Assistant Professor
Description
- Scientific research, and teaching
March 2013 - present
University Ibn Tofail, Faculty of Sciences, Physics department
Position
- PhD
January 2008 - March 2013
Ibn Tofail University, Faculty of Sciences, Physics department
Position
- PhD Student
Publications
Publications (50)
In this work, we investigated the electrical and dielectric properties of a new biocomposite-based vinyl resin emulsion reinforced with microparticles of green microcrystalline cellulose. We measured the electrical response of each sample by assessing AC electrical conductivity in the temperature range of 260–340 K and in the frequency range of 100...
Fused filament manufacturing (FFF), also known as 3D printing, is one of the most commonly used additive manufacturing techniques for creating high-quality materials. This process demonstrates the intricacies and challenges involved in choosing appropriate manufacturing parameters to achieve the desired outcomes. Among these critical parameters is...
In this work, we investigated the thermal degradation of high molecular weight polymethylmethacrylate (HMW‐PMMA) nanocomposites reinforced with titanium dioxide (TiO 2 ) nanoparticles (NPs) in two morphologies, namely nanodots (NDs) and nanorods (NRs). Thermogravimetric (TG) measurements were studied by using a weight loss kinetic model based on th...
Corrosion of steel tubes represents a major challenge for various industries, leading to significant economic and environmental impacts, such as material losses, operational interruptions and safety risks. This study focuses on the metallurgical, chemical and mechanical characterization of corroded steel tubes operating in mining installations usin...
Fused filament manufacturing (FFF), also known as 3D printing, is one of the most commonly used additive manufacturing techniques for creating high-quality materials. This process demonstrates the intricacies and challenges involved in choosing appropriate manufacturing parameters to achieve the desired outcomes. Among these critical parameters is...
Composite materials are often exposed to repeated impact in their industrial applications, which can have serious consequences on their mechanical performance. Therefore, the key purpose of this investigation is to study experimentally and numerically the response of laminated composites and sandwich composites. This involves evaluating their mecha...
Composite materials are vulnerable to impacts that may occur during their use. Such transverse loads represent a significant threat to these materials because they can cause damage that is difficult to detect. Thus, understanding the mechanical behavior of composite materials during impacts is crucial for improving their damage resistance. Therefor...
Nanofluids generated by the addition of various fractions of multi-walled carbon nanotubes (MWCNTs) and 0.5 wt% of graphite (Gt) in commercial engine oil have been electrically studied at frequencies ranging from 100 Hz to 1 MHz and temperatures from 300 to 400 K. The analysis of the electrical resistivity of the prepared nanofluids has shown a per...
This paper reports research on the electrical conduction mechanisms of nanofluids, formed by adding carbon nanotube (CNT) and 0.5 wt% of graphite (Gt) particles to engine oil, in the range of temperatures up to 400 K. An analysis of the dc conductivity of nanofluids versus CNT concentration and temperature, have shown a percolation threshold of 0.6...
Dielectric measurements performed on vinyl resin (VR) matrix and its composites reinforced with microcrystalline cellulose (MCC) and multi-wall carbon nanotubes (MWCNT) focus on the effect of the reinforcement weight fraction variation on its electrical properties in the frequency and temperature ranges 0.1 Hz–1 MHz and 30–130 °C, respectively. The...
The aim of this study is to establish a connection or correlation between the electrical and structural properties of ternary composites, which were prepared by adding multi-walled carbon nanotubes (MWCNT) and graphite (Gr) as conductive fillers to an insulating Polyester matrix. The study utilized small-angle neutron scattering (SANS), infrared (I...
This work presents an investigation on the optical and structural properties of two series of nanocomposites based on the incorporation of spherical- (NDs) or rod-shaped (NRs) semiconductive crystalline titanium dioxide (TiO2) nanoparticles (NPs) into an insulating amorphous polymethylmethacrylate (PMMA) matrix. The UV–visible absorbance and reflec...
Plasmonic nanostructured materials made of nanohole arrays in metal are significant plasmonic devices exhibiting resonances and strong electromagnetic confinement in the visible and near-infrared range. As such, they have been proposed for use in many applications such as biosensing and communications. In this work, we introduce the asymmetry in na...
Lead titanate (PT) and lead titanate doped with 7% of lanthanum (PLT7) thin films were successfully deposed on glass substrates using the sol–gel spin coating process. X-ray Diffraction patterns show the transformation of the tetragonal perovskite structure of the PT thin film to the pseudocubic phase when the PT is doped with lanthanum. A SEM micr...
Array antennas offer flexible and versatile solutions for achieving desired antenna performances. This work presents an improvement in the performance of a microstrip patch array antenna at a frequency of 28 GHz for wireless communications. The proposed array consists of four identical elements in parallel feeding via a simple microstrip line divid...
Dielectric analyses were investigated on vinyl resin emulsion based on ethylene vinyl acetate/vinyl ester of versatic acid terpolymer (EVA/VeoVa) and its composites reinforced with microcrystalline cellulose and multi-wall carbon nanotubes. Dielectric spectra were measured in the frequency range from 10 ⁻¹ Hz to 10 ⁷ Hz and the temperature interval...
This work presents a study on the electrical and structural properties of percolating composites based on graphite (Gt) particles dispersed with various concentrations into an insulating polyester matrix (PES). Their structural characterization was performed using small-angle neutron scattering (SANS), providing information about the dispersion of...
Ferroelectric thin films of lead titanate (PbTiO3) have been prepared on SiO2/Si(100) and LaNiO3(110)/SiO2/Si(100) substrates by a sol-gel spin coating method, using lead acetate trihydrate, and titanium isopropoxide as precursors along with 2-methoxyethanol as a solvent and acetic acid as catalyst. X-Ray Diffraction patterns show the formation of...
Binary and ternary composites were synthesized using a polyester matrix reinforced by two types of carbon inclusions, namely, carbon nanotubes (CNT) and graphite (Gt) (CNT/Gt/Polyester). Thermal analyses were performed, using thermogravimetry and differential scanning calorimetry, which allowed us to observe significant changes in glass transition...
A three phase predictive model is presented based on the generalized effective medium (GEM) modified equation which describes the DC electrical conductivity of a wide variety of binary mixtures. Six series of two- and three-dimensional composites have been investigated, at a constant temperature, taking into account the role of the interphase zone...
In this paper, we report an investigation on electrical conduction mechanisms of nanofluids based on commercial engine oil loaded with graphite (Gt) and multiwalled carbon nanotubes, at different concentrations. The impedance spectroscopy technique was used to measure the resistance and capacity characterizing each sample in a frequency range 100 H...
In this work, we report the structural, thermal and electrical properties of composites consisting of polypyrrole particles in a polymethylmethacrylate matrix. Electrical resistivity analysis of these percolating composites showed a remarkable change in the conduction mechanisms below and above the percolation threshold. Structural properties were...
In this work, we report an experimental study of the thermal and electrical properties of heterogeneous materials based on ethylene butylacrylate copolymer filled with carbon black nanoparticles. For this study, a series of samples were prepared with filler fractions above the percolation threshold. Their thermal characterization was performed usin...
An investigation of the thermal, electrical and dielectric properties of original nanocomposite materials based on the incorporation of carbon dots, synthesized in organic solvents, in a poly(methyl methacrylate) (PMMA) is presented. Thermal analysis was performed using differential scanning calorimetry. Electrical and dielectric measurements were...
This work presents a study of the structural, electrical, and dielectric properties of polymethylmethacrylate/polypyrrole composites. Structural analysis was performed using X-ray diffraction, showing an increase in the crystallinity index with the increasing of filler concentrations. The electrical conductivity mechanism and the dielectric relaxat...
Zinc oxide (ZnO) and aluminum doped zinc oxide (AZO) nanoparticles were synthesized by a typical sol-gel method. The effect of the doping and the annealing temperatures were studied. The dopant percentage of 4% was fixed. XRD patterns showed that ZnO and Al doped ZnO nanoparticles exhibit good crystallization. The crystallite size was shown to decr...
The dielectric properties of biocomposite materials based on vinyl resin filled with microcrystalline cellulose, in the frequency range from 100 Hz to 1 MHz and in the temperature range from 280 to 400 K, are presented. Two dielectric relaxations were identified. The first one is attributed to the α-relaxation, associated with the glass transition...
Ce rapport retrace mes activités depuis mon recrutement à la Faculté des Sciences de
Kénitra en janvier 2015, en tant que professeur assistant. Certains de ces travaux de recherche présenté sont achevés, d’autres sont en cours ou encore dans un stade exploratoire.
La première partie décrit mes activités d’enseignement et mes responsabilités
pédago...
Over the past few years, Cu-based materials have been intensively studied focusing on their structural and thermoelectric properties. In this work, copper sulphide powders were synthesized by the sol-gel method. The chemical composition and the morphological properties of the obtained samples were analyzed by X-ray diffraction, differential thermal...
Copper sulfide nano-particles were prepared by the sol-gel method followed by a thermal treatment at 200 °C. Structural and optical properties were analyzed using X-Ray Diffraction, Scanning Electron Microscopy, Fourier Transform Infrared and UltravioleteVisible spectroscopies. It was found that the obtained compound is a mixed phase and contains r...
This study predicts the effect of the conducting filler/insulating matrix interphase on the electrical properties of two series of percolated systems, differing from the type of carbon black particles mixed in an amine-cured epoxy matrix, diglycidylic ether of bisphenol F. To take into account the interactions between the conducting filler and the...
This study deals the prediction of temperature effect on low-frequency dispersion of alternating current (AC) conductivity spectra of composite materials based on copolymer reinforced with carbon black (CB) particles. A sample of ethylene butylacrylate loaded with 13% of CB particles were prepared and investigated using the impedance spectroscopy r...
This work presents a study on the electrical conductivity of composites made up of polypyrrole particles in a polymethylmethacrylate matrix. The conductivity was studied as a function of frequency in the range 40 Hz to 100 kHz, at room temperature. McLachlan and Mamunya models were used to fit the data and compute the response in a large range of f...
Electrical conductivity of polyester filled with carbon nanotubes composites have been studied from 240 to 380K in the frequency range from 100 Hz to 1 MHz as a function of the filler volume fraction above the percolation threshold. The frequency dependence of the electrical conductivity obeys the universal dynamic response. Positive temperature co...
Phase formation and structural properties of Ni-doped Li0.976-xNb1.005-x/5NixO3 (0 ≤ x ≤ 0.1) ceramics prepared by solid-state reaction method, are investigated in a temperature range from 400 to 900 °C. X-ray diffraction patterns indicate that single phase was formed for lithium niobate ceramics. It was shown that the unit-cell volume of the hexag...
Ceramic material sample of Li0.867Nb0.988Ni0.098O3 was prepared by solid-state reaction
method and their impedance spectra were measured in the frequency range from 1Hz to 10MHz and
temperature range from 400 to 800°C. The obtained data were analyzed by means of electric
impedance formalism. Two dielectric relaxation processes were revealed in the...
The electrical properties of polypyrrole/ polymethylmethacrylate composites containing 2 - 8 wt% polypyrrole particles were characterized. For temperatures below the glass transition of the composite, the frequency dependence of the ac conductivity, in the range 100Hz – 200 kHz, showed a sub-linear dispersive behaviour, i.e., it was found to be pro...
Nous étudions dans ce travail le comportement de la conductivité électrique statique (DC) de matériaux composites constitués de particules conductrices de carbone (noirs de carbone, nanotubes de carbone et fibres de carbone) dispersées dans un polymère thermodurcissable de type résine époxyde. Les valeurs expérimentales de la conductivité de ces ma...
Composites of an epoxy-resin matrix with randomly dispersed carbon black nanoparticles in various amounts and below the percolation threshold were prepared and their dielectric spectra were measured in the frequency range from100 Hz to 20 MHz and temperature range from 20 °C to 95 °C. The obtained data were analyzed by means of electric permittivit...
Dans ce travail, nous nous sommes intéressés à l’étude des propriétés de transports électriques de deux séries de matériaux hétérogènes constitués d’un copolymère de type Ethylène-co-Acrylate de Butyle (EAB) et d’une résine-époxyde de type Ether Diglycidique de Bisphénol F (DGEBF) chargés en particules de noirs de carbone (NC).
Les mesures de la co...
The dielectric properties of carbon black (CB) loaded in ethylene butylacrylate copolymer composite (EBA) were investigated in the frequency range between 10 and 10 Hz and temperature range between 250 and 400 K.
The frequency dependence of the dielectric response has been analyzed using the modulus formalism and the electrical conductivity using...
Conductivity measurements were made on carbon black/epoxy-resin composites over the temperature range from 22 to 70°C (Tg ≈83 °C) and for volume fractions of carbon black from 0.1 to 3.0%. The temperature effects on the electricall conductivity of these heterogeneous materials are analysed by Mott’s variable range hopping model, in order to underst...
We have investigated the electrical properties of carbon black (CB) loaded in ethylene butylacrylate copolymer composite (EBA) in the frequency range between 100 Hz and 10 kHz and temperature range between 153 and 353 K. The frequency dependence of electrical data have been analyzed in two frameworks: the electrical modulus formalism with the Kohlr...
The electrical properties of a composite, consisting in a matrix of ethylene butylacrylate (EAB) reinforced with carbon black particles (CB) are studied in the temperature range from 27 to 127 °C. The DC conductivity measurements show an insulator/conductor transition at a volume concentration of about Φ*≈11%. The electrical resistivity is constant...
The direct current (DC) conductivity of carbon black (CB) filled EAB composite material was measured in the temperature range from 130 to 290 K (T ≈ 198 K). That conductivity data was analyzed and interpreted in order to identify the conduction mechanisms and to observe the doping effect of CB particles on the EAB matrix. It shows that the conducti...
In this paper we report the d.c. electrical conductivity measurements between 80 and 350 K, and the dielectric properties at low frequencies (10 Hz < f < 100 kHz) at constant temperature T = 300 K, of the ethylene butylacrylate/carbon black nanocomposites, with different concentrations of the dispersed conducting particles. The concentration of the...
Questions
Questions (16)
When adding the semiconducting particles to the polymeric matrix, any changes in (Lamda) of the matrix, meaning no changes in the gap energy of the latter. This phenomenon does not follow the literature because of the mixture of conducting particles and insulating matrix. I mention that in the reflectance measurements, the effect of semiconducting charge is seen, i.e. adding semiconducting charge decreases the gap energy of the matrix.
In the attached file, an example of a measurement made using UV-Vis spectroscopy.
Can anyone help us give an interpretation of this behavior? thank you.
Regards
Some citations of published articles have not included in ResearchGate. How can we add them mainly?
A series of samples of nanofluids based on addition of different concentrations of carbon nanotubes into engine oil. The measurements of real and imaginary parts of impedance spectrum versus frequency have been made at temperature between 300 and 400 K. The results showed a clear relaxation in imaginary part (Z'') for all samples including the neat engine oil. How do we explain this behavior?
The measurements of temperature dependence of electrical conductivity shows a positive temperature coefficient (PTC) and negative temperature coefficient (NTC) below and above the critical temperature (Tc) of nanofluids based on engine oil loaded with different concentrations of carbon nanotubes (CNT).
- How do we explain this behavior ?
QM = Quantum Mechanics and the
MM = Molecular Mechanics
the formula is Nb2O5, I need the structure and cluster
In composite materials based on the mixture of conducting charges (filler) and polymeric matrix, several works have proven that there is an interphase zone.
In this case, could we consider the intephase zone between filler and macromolecular matrix as a capacitor?