Layla Beouch
Saint-Gobain
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Publication
Featured researches published by Layla Beouch.
Synthetic Metals | 2001
Layla Beouch; Francois Tran Van; Olivier Stéphan; Jean Claude Vial; Claude Chevrot
Abstract We synthesised soluble N -hexylcarbazole-co-3,4-ethylenedioxythiophene (HCz-co-EDOT) copolymers from mixtures in various ratio of the two corresponding dihalogenated monomers. From EDOT/HCz starting molar ratio: 0.25, 1, 4, we obtained random copolymers named, respectively, C1, C2 and C3 and we compared their properties to the two homopolymers synthesised in the same way. The Infra red studies clearly indicated, as expected, that an increase in the amount of ethylenedioxythiophene in the feed composition leads to an increase of the proportion of the corresponding comonomer in the final materials. Elemental analysis point out that the reactivity of dibrominated EDOT seems slightly lower than that of dibrominated HCz. Thin films of copolymer have been prepared and their electrochemical response have been investigated. Absorption and luminescence of these materials have been also studied in CHCl 3 . Copolymers mainly composed of one monomer (C1 and C3) behaves like the corresponding homopolymers. On an other hand, copolymer (C2) obtained from an equimolar amount of each monomer in the feed composition clearly exhibits distinct signals in optical spectra and in electrochemical behaviour, probably due to the presence of each monomer unit short segments . So, the use of C2 has been explored for possible application in light emitting devices indicating that the p-doping of the material would be facilitated leading to an improved hole injecting when compared to carbazoles homopolymer. It could be particularly interesting as a hole transporting layer in multilayer organic light emitting devices.
Advances in Science and Technology | 2008
Pierre Verge; Layla Beouch; Pierre Henri Aubert; Frédéric Vidal; François Tran-Van; Dominique Teyssié; Claude Chevrot
This paper describes the elaboration and optical characterizations of electrochromic devices (ECDs) based on a semi-Interpenetrating Polymer Network architecture. These ECD exhibit contrast ration of 36% in the full visible range and are able to switch 10,000 times at low voltage between +1.2V and -1.2V with only 0.2% of electroactivity lost. By the way, these IPN-based materials present interesting properties in the NIR region.
Structural Survey | 2012
Ronan Hébert; Layla Beouch; Odile Fichet; Jean-Philippe Bigas; Dominique Teyssié; Benoit Berthier; Jean‐Baptiste Prichystal
Purpose – This paper aims to present a case study of some current disorders affecting the stone‐panels of facade claddings, i.e. cracking, spalling close to anchorage systems and staining. The purpose of this study is to identify the origin of the mechanical and chemical disorders of the carbonate rock thin panels of the “Les Chenes 1” building of the University of Cergy‐Pontoise (France).Design/methodology/approach – Mapping of the disorders, anchorage system investigation at spallings, chemical analyses of oil‐like stains were performed in order to characterize both disorders. Porosity and capillarity properties of the rock were measured and compared between samples collected outside and within a stain.Findings – Mechanical disorders result from vandalism or poor implementation. Spallings are disorders very likely in evolution. Their occurrence may increase through time. Stains are made of silicone destabilization products.Originality/value – A model is proposed for the formation of oil‐like stains. Wat...
Journal of Physical Chemistry C | 2012
Noura Metri; Xavier Sallenave; Cédric Plesse; Layla Beouch; Pierre-Henri Aubert; Fabrice Goubard; Claude Chevrot; Gjergji Sini
Electrochimica Acta | 2008
François Tran-Van; Layla Beouch; Frédéric Vidal; Paolo Yammine; Dominique Teyssié; Claude Chevrot
Chemical Communications | 2011
Gihane Nasr; Audrey Guerlin; Frédéric Dumur; Layla Beouch; Eddy Dumas; Gilles Clavier; Fabien Miomandre; Fabrice Goubard; Didier Gigmes; Denis Bertin; Guillaume Wantz; Cédric R. Mayer
Polymer International | 2010
Frédéric Vidal; Cédric Plesse; Pierre-Henri Aubert; Layla Beouch; François Tran-Van; Guillaume Palaprat; Pierre Verge; Paolo Yammine; Johanne Citerin; Abderrahmane Kheddar; Laurent Sauques; Claude Chevrot; Dominique Teyssié
Thin Solid Films | 2008
R. Aich; François Tran-Van; F. Goubard; Layla Beouch; A. Michaleviciute; Juozas V. Grazulevicius; Bernard Ratier; Claude Chevrot
Tetrahedron Letters | 2010
N. Metri; Xavier Sallenave; Layla Beouch; C. Plesse; Fabrice Goubard; Claude Chevrot
Thin Solid Films | 2014
Frédéric Dumur; Layla Beouch; Mohamad-Ali Tehfe; Emmanuel Contal; Marc Lepeltier; Guillaume Wantz; Bernadette Graff; Fabrice Goubard; Cédric R. Mayer; Jacques Lalevée; Didier Gigmes