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Isaad J.,CNRS Textile Engineering Laboratory | Perwuelz A.,CNRS Textile Engineering Laboratory
Tetrahedron Letters | Year: 2010

We report an easiest synthesis strategy of a new class of synthetic dyes by coupling of functionalized pyrazolidine-3,5-dione derivatives via diazotization reaction with aromatic diamine for the azoic dyes or via dimerization reaction to synthesize the H chromophore dyes. Electron delocalization between the two coupled components has been studied using UV-vis spectroscopy, infrared, and NMR spectroscopy. In addition, the formation mechanism of such compounds has been discussed. © 2010 Elsevier Ltd. All rights reserved. Source


Ran J.,CNRS Textile Engineering Laboratory | Ran J.,Donghua University | Benistant G.,CNRS Textile Engineering Laboratory | Benistant G.,University of Lille Nord de France | And 9 more authors.
Journal of Applied Polymer Science | Year: 2012

A cationic functionalization was carried out on poly(ethylene terephtalate) (PET) nonwovens by the method of padding with a solution of polymer (P 1 and P x). An atmospheric pressure plasma treatment was prior used to improve the hydrophilic property of the nonwoven surface before the functionalization with cationic agents. The zeta potential measurements of the nonwovens, based on streaming potential, show the presence of cationic groups at the PET surface depending on the pH value. The analysis of washing water showed that the PET nonwoven functionalized with cationic polymer P x needed more washing cycles than with polymer P 1, to remove all the species non fixed at the surface. The cytotoxicity tests show that both of ammonium polymers are toxic toward endothelial cells. This means that it leaves many active chemicals on the surface of the functionalized materials, even after washing. © 2011 Wiley Periodicals, Inc. Source


Ashraf M.,CNRS Textile Engineering Laboratory | Ashraf M.,University of Lille Nord de France | Ashraf M.,Laboratoire des Materiaux Ceramiques et Procedes Associes | Campagne C.,CNRS Textile Engineering Laboratory | And 9 more authors.
Journal of Colloid and Interface Science | Year: 2013

ZnO nanorods were grown on microfibers of Polyethylene terephthalate (PET) fabric by seeding method to develop hierarchical roughness structure. XRD and XPS analysis show the presence of crystalline ZnO and chemical Zn species at the fiber surface at each stage of the process. Five series of samples with different seed concentrations have been realized, and their surface morphology and topography were characterized by AFM and SEM. Increasing seed concentrations lead to samples with superhydrophilic properties. Not only the water contact angle at fabric surface tends to zero but also the water capillary diffusion inside fabric is faster. Nanostructuration affects the structure inside the fabric, and further experiments with decane liquid have been made to get a better understanding of this effect. To study the superhydrophobicity, nanorods treated samples were modified with octadecyltrimethoxysilane (ODS) by two method; solution deposition and vapor deposition. The superhydrophobicity was characterized by measuring the water contact angle and water sliding angle with 5 μl water droplet. The samples modified with ODS by vapor deposition showed higher water contact angles and low water sliding angle than the ones modified with solution method. The lotus effect has been well correlated with the surface morphology of the nanorods structured fibers. The application of the Cassie-Baxter equation is discussed. © 2012 Elsevier Inc. Source


Isaad J.,CNRS Textile Engineering Laboratory | Perwuelz A.,CNRS Textile Engineering Laboratory
Tetrahedron Letters | Year: 2010

Cyanide detection in pure water is important for many applications. We present a novel type of chemodosimeter azo dye developed on the basis of the benzophenone as the electrophilic receptor of the cyanide anion and a saccharidic moiety to render the dye water soluble. This chemodosimeter is found to be highly selective and tunable toward only cyanide in pure water. © 2010 Elsevier Ltd. All rights reserved. Source


Vargas A.F.,University of Antioquia | Vargas A.F.,CNRS Textile Engineering Laboratory | Orozco V.H.,University of Antioquia | Orozco V.H.,CNRS Textile Engineering Laboratory | And 7 more authors.
Composites Part A: Applied Science and Manufacturing | Year: 2010

Polypropylene and polypropylene grafted maleic anhydride based composites with modified and non-modified carbon nanotubes and sepiolite were prepared by melt extrusion. Their thermal, rheological, and dynamic mechanical properties were evaluated. Multifilament yarns were obtained from the composites by spin-drawing process and their mechanical properties were measured. Knitted fabrics from the multifilament yarns were characterized by cone calorimetry. The best interaction was obtained for polypropylene/carbon nanotubes and polypropylene/polypropylene grafted maleic anhydride/sepiolite composites, as was confirmed by the increasing on the elastic modulus and thermal resistance. Nanofillers changed the thermal decomposition profiles compared to bare polypropylene. Knitted structures containing sepiolite decrease the maximum of heat release rate in comparison with unfilled samples. © 2010 Elsevier Ltd. All rights reserved. Source

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