Thomson-csf

Thales

Thompson-csf

Thales and Ecole Polytechnique

Ecole Polytechnique

Pierre Le Barny

Jean-Claude Dubois

Jean Claude Dubois

Gilles Ravaux

Dominique Broussoux

Laurent Bouteiller

Francoise Soyer

Sophie Muller

Didier Pribat

Serge Le Berre

Philippe Robin

Pierre Legagneux

Jean-Pierre Vairon

Jean P Billard

Julien Nagle

Lydie Thirant

Marie Vergnolle

Annie Beguin

Sophie Esselin

Paolo Bondavalli

Alain Leborgne

Nicole Lacoudre

Nicolas Spassky

Claudine Noel

Evelyne Chastaing

Jean-Claude Dudois

Christophe Galindo

Laurent Divay

A process for producing an electrode-gel electrolyte assembly based on porous carbonaceous material comprising radical-trapping sites comprises: a step of forming a bond between the radical-trapping sites of the carbonaceous material and functionalizing molecules, a step of preparing a solution comprising at least one monofunctional monomer and at least one polyfunctional monomer, an ionically conductive electrolyte and a radical initiator, a step of impregnating the solution of the monomers into the pores of the carbonaceous material, and a step of in situ radical polymerization of the monomers.

Electrode-gel electrolyte assembly comprising a porous carbon material and obtained by radical polymerisation

In an array R of field-effect transistors for detecting analytes, each transistor of the array comprises a gate G, a semiconductor nanotube or nanowire element NT connected at one end to a source electrode S and at another end to a drain electrode D, in order to form, at each end, a junction J, Jwith the channel. At least transistors FET, FETof the array are differentiated by a different conducting material (m, m) of the source electrode S and/or drain electrode D.

Array of differentiated FETS having a nanotube or nanowire channel and corresponding electronic device, for the detection of analytes

Disclosed is a novel type of composite electro-optical material based on liquid crystal dispersed in a polymer with reactive functional groups (Y). The originality of this material lies in the chemical modification of the interface between the polymer and the liquid crystal leading to the formation of a composite material comprising a porous network of polymer and liquid crystal molecules in the pores of the network. The polymer possesses reactive functional groups (Y) and functional groups (X) at the interface between the polymer and the liquid crystal. The totality constituted by the functional groups (Y) and the functional groups (X) enables the optimizing of the electro-optical performance characteristics obtained from this type of material. Also disclosed is a method to obtain this composite material as well as a device comprising a material such as this.

Electro-optical material based on polymer-dispersed liquid crystal,

Disclosed is an original method for preparing composite materials for a display screen, these materials containing a polymer, liquid crystal and dye. The present problem is one of inserting molecules of dye into composites of this type. The disclosed method proposes the preparation, in a first step, of a porous film of reticulate polymer. Then, molecules of liquid crystal (XL) and molecules of dye (C) are made to diffuse therein by a polymer-expanding solvent. After evaporation of the solvent, a film of polymer is obtained with inclusions containing liquid crystal (XL) and dye (C) with a wide range of concentrations in liquid crystal, thus making it possible to optimize the performance characteristics in terms of contrast and control voltage of the screen thus made.

Method for obtaining composite materials based on polymers and liquid

The disclosure relates to fluorinated chiral liquid crystals that incorporate a cyclohexyl grouping in their structure. They can be used as dopants and lead to mixtures of ferroelectric liquid crystals that have an application in display systems. They meet the following chemical formula. ##STR1## with 1.ltoreq.n.ltoreq.14 if X=CH.sub.2 Y=--CH.sub.2 -- with R=CmH.sub.2m+1 and 5.ltoreq.m.ltoreq.16 ##STR2##

Fluorinated liquid crystals

This invention concerns new molecules with active, non-linear optical properties and which can be thermally reticulated (more precisely, these molecules include terminal functions which can be reticulated, attached to either side of the groups active in non-linear optics, which can be oriented under an electrical field). When reticulated and oriented under an electrical field, these materials are particularly stable and can be employed for industrial applications, using non-linear optics (electrooptical modulators, frequency doublers, etc.).

Thermally reticulated materials for non-linear optical applications

Process for obtaining a structure generating non-linear electrooptical

The invention is a family of amorphous copolymers, transparent in the visible range, for use in non-linear optical applications. The copolymers are produced by copolymerizing an alkyl methacrylate or an alkyl acrylate or a .gamma. alkyl acrylate halide or an alkyl phenylacrylate or a .gamma. trifluoromethyl acrylate with a monomer containing the entity which generates the second-order non-linear effects.

Amorphous copolymers, transparent in the visible range, for non-linear

The invention concerns a reticulable polymer for use in non-linear optics, the polymer being constituted of a skeleton to which side chains are attached; one chain ensures the amorphous nature of the polymer, the skeleton consisting of polyacrylic, polystyrene or polysiloxane, and a second side chain able to generate non-linear optical effects and terminating in a heat or photochemically reticulable group.

Reticulable polymer for applications in non-linear optics

The invention is a series of amorphous copolymers which, used in association with a small molecule, provide photorefractive materials that can be used in optical signal processing. These copolymers contain an active non-linear optical group and a group which contributes to their photoconductivity. ##STR1## where: X is H, CH.sub.3, Cl or F

Amorphous copolymers for photorefractive compounds used in optical

The invention relates to polymeric materials usable in non linear optics. The structure of the material of the invention includes a skeleton to which side chains are attached, the material resulting from the association of a first and a second monomer, the first monomer including a mesomorphogenic group connected to the skeleton by a spacer, the second monomer including a group capable of generating the second harmonic of an electromagnetic wave and also being connected to the skeleton by a spacer.

Mesomorphic polymer material usable in non linear optics

In a family of side-chain homopolymers of the polyacrylate type derived from 1-(phenyl)-2-(4-cyanophenyl)-ethane and exhibiting one or a number of mesophases, the polymer in accordance with the invention corresponds to the following general chemicals formula: ##STR1## where x indicates the degree of polymerization and 2.ltoreq.n.ltoreq.15.

Side-chain mesomorphic polymers derived from

The invention relates to a family of organic compounds of the 1(4 hydroxyphenyl)2(4' cyanophenyl) ethane ester type which have a smectic A type mesomorphic phase, to the mixture obtained from these compounds as well as the method for manufacturing the molecules of this family. The compound of the invention corresponds to the general chemical formula: ##STR1## n being between 1 and 15.

Organic compound having a smectic phase A, and a mixture comprising this

The invention relates to a family of sidechain homopolymers of the polyacrylate type derived from 3-fluoro-4-cyanophenol and exhibiting a mesophase of the nematic or smectic-A type. The polymer in accordance with the invention corresponds to the following general chemical formula : ##STR1## where x indicates the degree of polymerization and 4.ltoreq.n.ltoreq.15.

Mesomorphic side-chain polymers having high dielectric anisotropy and a

The invention relates to a group of organic compounds of the 1-(4-hydroxyphenyl)-2-(4'-trifluoromethylphenyl)-ethane ester type having a mesomorphous phase of the smectic A type, to the mixtures obtained from said compounds, as well as to the process for producing the molecules of said group. The compound according to the invention is in accordance with the general chemical formula: ##STR1## whereby n can be between 1 and 15.

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Orsay, France

Pierre Le Barny