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El Rhazouani O.,Mohammed V University | Benyoussef A.,Mohammed V University | Benyoussef A.,Institute of Nanomaterials and Nanotechnology | Benyoussef A.,Hassan II Academy of Science and Technology | And 3 more authors.
Physica A: Statistical Mechanics and its Applications | Year: 2014

The double perovskite (DP) Sr2CrReO6, with its high Curie temperature, is a good candidate for magneto-electric and magneto-optic applications. Thus, a theoretical study by Monte Carlo Simulation (MCS) and Mean Field Approximation (MFA) in the context of the Ising model is important for a better understanding of the magnetic behavior of this material. The critical behavior of the magnetization and the susceptibility of this system have been determined. The phase diagrams depending on the exchange couplings and the crystal fields have been given. The values of critical exponents are also reported. © 2013 Elsevier B.V. All rights reserved.

Bailly M.,Queens University | Kontopoulou M.,Queens University | El Mabrouk K.,Institute of Nanomaterials and Nanotechnology
Polymer | Year: 2010

The microstructure and rheology of melt compounded ethylene-octene copolymer (EOC) nanocomposites, containing different types of functionalized matrices and nanosilica particles, were investigated. The EOC matrix was functionalized via silane grafting, using monofunctional (vinyltriethylsilane-VTES) or bifunctional (vinyltriethoxysilane VTEOS) silane agents, to prepare EOC-g-VTES and EOC-g-VTEOS respectively. Two different types of silica were used, unmodified (SiO2), or modified with octylsilane (oct-SiO2). Depending on the matrix/filler combination, different types of polymer/filler interactions were present in these composites. The formation of covalent bonds between the VTEOS functionality and the hydroxyl groups present at the surface of the particles, generated strong polymer/filler interactions, resulting in improved filler dispersion. The presence of polymer/filler interactions was confirmed by bound polymer measurements. TEM micrographs revealed a fractal-like composite structure, which agreed with the exponents determined through small angle oscillatory shear rheometry (SAOS). Rheological properties in the melt state revealed significant differences, depending on the types of matrix and filler used. Time-sweep experiments showed pronounced time-dependence indicative of a tendency toward aggregation for the EOC-g-VTES-based composites. On the contrary, strong polymer/filler interactions between EOC-g-VTEOS and oct-SiO2 resulted in a stable response. During strain-sweep experiments the EOC-g-VTEOS-based composites exhibited a higher critical strain for the onset of non-linearity, indicative of stronger adhesion between the fillers and the matrix. DMA measurements showed that more energy is dissipated during the glass transition in the composites with enhanced polymer/filler interactions. © 2010 Elsevier Ltd.

Drissi L.B.,Institute of Nanomaterials and Nanotechnology | Saidi E.H.,Institute of Nanomaterials and Nanotechnology
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2011

Using the SU(5) symmetry of the 4D hyperdiamond and results on the study of 4D graphene given in Drissi et al., we engineer a class of 4D lattice QCD fermions whose Dirac operators have two zero modes. We show that generally the zero modes of the Dirac operator in hyperdiamond fermions are captured by a tensor Ωμl with 4×5 complex components linking the Euclidean SO(4) vector μ; and the 5-dimensional representation of SU(5). The Boriçi-Creutz (BC) and the Karsten-Wilzeck (KW) models as well as their Dirac zero modes are rederived as particular realizations of Ωμl. Other features are also given. © 2011 American Physical Society.

El Kazzouli S.,Institute of Nanomaterials and Nanotechnology | El Brahmi N.,Institute of Nanomaterials and Nanotechnology | El Brahmi N.,CNRS Coordination Chemistry | Mignani S.,Institute of Nanomaterials and Nanotechnology | And 4 more authors.
Current Medicinal Chemistry | Year: 2012

Metallodrugs (organometallic complexes) bearing at least one metal-carbon bond-represent original and powerful tools for diverse therapeutic applications based on the development of "bioorganometallic chemistry". To date, various metallodrugs were described with very interesting biological activities as antimalarials, antibacterials, neuroprotectors, against arthritis, for chemotherapy etc. Anticancer Pt-based drugs are the main complexes used in the treatment of several cancers, but unfortunately these complexes show elicit and severe toxicities and resistance effects. The remarkably unique and tunable properties of dendrimers have made them promising tools for diverse biomedical applications such as diagnostics, gene therapy and drug delivery including in oncology. Recent studies have shown that well designed dendritic carriers overcome such as poor solubility, permeability, biocompatibility, bioavailability and toxicity of the native drug. This review reports on the recent advances for the use of metallodrugs and dendritic based carriers (drug-dendrimer conjugates and drug encapsulation) in oncology. Advantages, limitations and opportunities in oncology of such materials are discussed and compared. © 2012 Bentham Science Publishers.

Dyankov G.,Institute of Nanomaterials and Nanotechnology | Dyankov G.,Plovdiv University | Zekriti M.,Institute of Nanomaterials and Nanotechnology | Zekriti M.,Universite Ibn Tofail | And 2 more authors.
Applied Optics | Year: 2012

We propose a plasmonic structure, based on a silver-gold two-layered metallic film, where two surface plasmons (SPs) with equal propagation constants are excited simultaneously at different wavelengths. We show theoretically that the bimetallic film provides unique opportunities for manipulation of plasmons and optimization of the accuracy and cross-sensitivity. The structure can be used as an effective self-reference SP sensor in wavelength-interrogated design. © 2012 Optical Society of America.

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