Thesis Resume 

   

   This thesis subject is based on modeling and numerical computation. The first step is to identify the influence of various parameters by comparing the results of several physical models (structure of matter and roughness for multilayers). The aim is to classify these known models in terms of sensitivity to various experimental parameters, in order to determine effective properties over a wide range of wavelengths. We verify of the relevance of the models of effective properties, taking into account the information available on the material structure, in particular the porosity and the crystalline state could be based on the methods of coupled dipoles or finite elements. This classification and the choice of the model are made through meta-heuristic algorithms (genetic algorithm, optimization by particle swarms, optimization by artificial bee colony, etc.) which are more and more sophisticated. Ultimately, the goal is to identify the best physical model for different types of materials and different behaviors.
 

Master Resume 

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     Bio-based nanocomposites are a relatively new class of nanomaterials. This paper aims to investigate the properties of Poly(ε-caprolactone) reinforced by different amounts of Halloysite nanotubes (1%,2%,3%,5%, and 10%) because of their compatibility interface providing better mechanical properties and make their use possible in a wide range of application. Broadband Dielectric Spectroscopy (BDS) is used to study the dielectric properties of this different samples in the frequency range from 10-1Hz to 106 Hz and in the temperature range -70°C to 50°C. Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA) and Infrared spectroscopy (IR) are also
used in order to investigate thermal , mechanical and vibrational properties. The results are discussed in terms of molecular relaxation process and interfacial polarization. The work aims to investigate especially the nanofillers impact on the matrix, the obtained parameters confirms that the most performing material is PCL reinforced with 3% of HNTs. Limitation in the amounts of HNTs are observed where it should not exceed 5% otherwise the material will acquires the same properties as the neat PCL.

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Publications

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1) Tasnim Gharbi, Dominique Barchiesi, Sameh Kessentini, and Ramzi Maalej

Fitting optical properties of metals by Drude-Lorentz and partial-fraction models in the [0.5;6] eV range

Optical Materials Express, Vol. 10, Issue 5,, pp. 1129-1162, 2020

DOI: 10.1364/OME.388060

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