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Nesterenko D.V.,Innovation and Research MAScIR | Sekkat Z.,Innovation and Research MAScIR | Sekkat Z.,Mohammed V University | Sekkat Z.,Hassan II Academy of Science and Technology
Plasmonics | Year: 2013

Figures of merit are introduced for estimation of achievable resolution of surface plasmon (SP) sensors by modulation type. The resolution of SP sensors in the Kretschmann's geometry is estimated by numerical simulation for combinations of silver (Ag), copper (Cu), aluminum (Al), chromium, and titanium layers with a gold (Au) layer in the ultraviolet (UV), visible, and infrared (IR) regions in cases of detecting the change of the refractive index of water and the presence of an adsorption layer in water. SP biosensors with angular modulation based on Al exhibit low resolution in the UV region; Ag, Au, and Cu biosensors show best resolution in the visible region. Biosensors with intensity modulation demonstrate high performance in the near IR by Ag, Au, and Cu metals, and in the UV by Al. © 2013 Springer Science+Business Media New York.

Hayashi S.,Innovation and Research MAScIR | Hayashi S.,Kobe University | Nesterenko D.V.,Innovation and Research MAScIR | Sekkat Z.,Innovation and Research MAScIR | Sekkat Z.,Mohammed V University
Optical Sensors, 2014 | Year: 2014

Sharp Fano resonance and electromagnetically induced transparency (EIT) are demonstrated for a planar sensor structure. The sharp resonances are due to coupling between a surface plasmon mode and a waveguide mode. © 2014 OSA.

Reshak A.H.,University of West Bohemia | Reshak A.H.,University Malaysia Perlis | Nouneh K.,Innovation and Research MAScIR | Kityk I.V.,Czestochowa University of Technology | And 6 more authors.
International Journal of Electrochemical Science | Year: 2014

DFT analyses of band structure dispersion and of contribution of different anionic sub-groups to the studied electronic structure together with the anisotropy of optical functions were performed for the two promising solar cell crystals Cu2ZnSnS4 and Cu2ZnSnSe4. We have applied the state-of-the-art full potential linear augmented plane wave (FPLAPW) method in a scalar relativistic version. Exchange and correlation potential were introduced within a framework of the local density approximation (LDA) and gradient approximation (GGA). We show that Cu2ZnSnS4 as well as Cu2ZnSnSe4 crystals possess a direct energy band gap situated around the center of the BZ. Careful analysis of the total density of states together with the partial contribution of the particular orbital were performed for evaluations of contribution of corresponding bonds to the origin of the chemical bonds. Role of replacing of S by Se is analyzed in the details for the electronic density of states with respect to the nature of chemical bonds. The principal analysis is performed for the dispersion of the optical constants. The influence of the different chemical bonds into the dispersion of the optical functions is analyzed in order to optimize the optical features with respect to the requirements of the solar cell elements. © 2014 by ESG.

Harmaoui A.,Mohammed V University | Bouhfid R.,Innovation and Research MAScIR | Essassi E.M.,Mohammed V University | Essassi E.M.,Innovation and Research MAScIR | And 3 more authors.
Acta Crystallographica Section E: Structure Reports Online | Year: 2015

In the molecule of the title compound, C7H9N5O·0.40H2O, the seven-membered heterocyclic ring exhibits a boat conformation, whereas the five-membered triazole ring is almost planar (r.m.s. deviation = 0.005 Å). In the crystal, centrosymmetric dimers are linked by pairs of C - H⋯O hydrogen bonds into dimers, which are further connected via O - H⋯N and C - H⋯N hydrogen bonds, forming a three-dimensional network. The structure contains a partially occupied water molecule lying on a twofold axis with an occupancy factor of 0.4.

Raji M.,Mohammed V University | Essabir H.,Innovation and Research MAScIR | Essassi E.M.,Mohammed V University | Bouhfid R.,Innovation and Research MAScIR | Qaiss A.e.K.,Innovation and Research MAScIR
Polymer Composites | Year: 2016

In this work, Illite (natural Moroccan clay) was selected to reinforce high density polyethylene (HDPE) and to determine the efficiency of styrene-(ethylene-butene)-styrene triblock copolymer grafted with maleic anhydride (SEBS-g-MA) as a coupling agent. The composites were prepared by extrusion followed by injection molding of various clay contents (5-40 wt%). From the samples produced, the morphological, thermal, mechanical, and rheological properties were measured. The results showed that interfacial adhesion was improved with coupling agent addition leading to increased Young's modulus, as well as higher tensile strength, and strain at yield. Nevertheless, the maximum value for the composites without SEBS-g-MA (57% modulus increase) was obtained at 20 wt% compared to 15 wt% for the composites with SEBS-g-MA (45% modulus increase). The thermal stability of the composites also increased with clay content, especially when the coupling agent was added. Finally, water absorption tests revealed that the composites have a higher tendency to absorb water with increasing clay content, but the use of a coupling agent substantially reduced this problem. © 2016 Society of Plastics Engineers.

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