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Zouhairi M.,Laboratoire Of Chimie Of La Matiere Condensee | El ghadraoui E.,Laboratoire Of Chimie Of La Matiere Condensee | Bali H.,Laboratoire Of Chimie Of La Matiere Condensee | Lamcharfi T.,Laboratoire des signaux
Physical and Chemical News | Year: 2012

Preparation of the pure phase PFN by the classical solid state reaction, shows a good homogenization of the starting products. The powder was heat treated at 300°C and then calcined at different temperatures. The pure perovskite phase was obtained at 850°C; the latter is relatively low compared to other temperatures of calcinations of samples synthesized using other chemical processes. Dielectric investigations revealed a non relaxing behavior with a diffuse character. The value of the temperature of the maximum of the permittivity is close to those reported in the literature.


Etteyeb N.,Laboratoire Of Chimie Of La Matiere Condensee | Jaouen V.,University Pierre and Marie Curie | Steunou N.,University Pierre and Marie Curie | Gharbi N.,Laboratoire Of Chimie Of La Matiere Condensee | Coradin T.,University Pierre and Marie Curie
Silicon | Year: 2012

Biopolymers are promising alternatives to synthetic macromolecules for the design of composite materials complying with Green Chemistry principles. In this context, the conditions to associate hydroxypropyl-cellulose and polymethylhydrosiloxane within homogeneous membranes were studied. The stability of these membranes in water and in the presence of a cellulase enzyme were investigated by Thermogravimetric Analysis, Scanning Electron Microscopy and Fourier-Transform Infra-Red Spectroscopy. These investigations reveal that the biopolymer is still accessible to a solubilisation/degradation process without inducing the breaking down of the composite materials, opening the route to the design of novel membranes for environmental applications. © 2011 Springer Science+Business Media B.V.


Soltane L.,Laboratoire Of Chimie Of La Matiere Condensee | Sediri F.,Laboratoire Of Chimie Of La Matiere Condensee | Sediri F.,University of Tunis | Gharbi N.,Laboratoire Of Chimie Of La Matiere Condensee
Materials Research Bulletin | Year: 2012

Layered sheet-like nanocrystalline VO 2·(H 2O) has been synthesized by hydrothermal process using V 2O 5 as vanadium source and 2-phenylethylamine as a reducing agent and a structure-directing template. Techniques X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and nitrogen adsorption/desorption isotherms have been used to characterize the structure, morphology and composition of the materials. Electrical conductivity measurements showed that the as synthesized VO 2·(H 2O) nanosheets has a conductivity value which goes from 75 × 10 -6 Ω -1 cm -1 at 298 K, to 68 10 -5 Ω -1 cm -1 at 386 K with activation energy of 0.24 eV. © 2012 Elsevier Ltd. All rights reserved.


Chine M.K.,Laboratoire Of Chimie Of La Matiere Condensee | Sediri F.,Laboratoire Of Chimie Of La Matiere Condensee | Sediri F.,University of Tunis | Gharbi N.,Laboratoire Of Chimie Of La Matiere Condensee
Materials Research Bulletin | Year: 2012

Flake-like nanocrystalline V 4O 9 has been successfully synthesized by solvothermal process using V 2O 5 as vanadium source and phenolphthalein as a reducing agent and a structure-directing template. Techniques X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy and ultraviolet-visible (UV-vis) spectroscopy have been used to characterize the structure, the morphology and the composition of the material. The photocatalytic activity of the material has been evaluated by the degradation of methylene blue under visible light irradiation. As a result, after the lapse of 150 min, around 93.54% bleaching was observed, with V 4O 9 nanoflakes yielding more photodegradation compared to that of bulk V 2O 5. This presents a degradation percentage of about 44.67%. © 2012 Elsevier Ltd. All rights reserved.

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