Abstract: The present invention relates to a material for an electrochemical device, especially a fuel cell, an electrolyzer or a storage battery, comprising a matrix and activated boron nitride contained in the matrix.

Abstract: The present invention relates to a material for an electrochemical device, especially a fuel cell, an electrolyzer or a storage battery, comprising a matrix and activated boron nitride contained in the matrix.

Abstract: The present invention relates to a material for an electrochemical device, especially a fuel cell, an electrolyzer or a storage battery, comprising a matrix and activated boron nitride contained in the matrix.

Abstract: The present invention relates to a method for treating effluents, especially the effluents from leather tanneries, containing chrome salts, i.e. the salts of chromium having a (III) oxidation degree, characterized in that the supplied effluents or those having a pH that is lower than 6 undergo an electrochemical reaction in a reactor comprising an anode and a cathode in such a way that the chromium having a (III) oxidation degree is transformed into chrome having a (VI) oxidation degree, and in that the treated effluents are recovered. The treatment method is followed in an advantageous manner by a method for recovering the hexavalent chromium by means of selective extraction in an appropriate solvent medium followed by reduction of the hexavalent chromium into trivalent chromium.

Abstract: An enameling lacquer comprises a base first polymer and a copolymer which is compatible with said first polymer and which contains polymeric chains selected from polysiloxanes, fluorated chains and alkane chains. The lacquer is of particular application to an enameled wire comprising at least one layer of an enamel obtained by reticulation of the lacquer.

Abstract: Aqueous alkaline solid electrolyte comprising a polar polymer matrix which is solid at ambient temperature, and a compound or mixture of basic compounds selected from alkaline metal, alkaline-earth or ammonium hydroxides. Preferably, the matrix is a polyether homopolymer or copolymer of different ethers or polyethers. The invention also concerns electrodes and/or electrochemical generators containing such an alkaline polymer solid electrolyte.

Abstract: An organic material for non-linear optics, in which the structure of the molecule includes an electron donor group and an electron attractor group connected by means of an electron-transmitting group, the material being characterized by the fact that it satisfies the formula: ##STR1## where R is selected from (CH.sub.3).sub.2 N and CH.sub.3 O, with the first material being dimethylamino 4, cyano 4' biphenyl and the second being methoxy 4, cyano 4' biphenyl.

Abstract: An organic material for non-linear optics comprising:an electron donor group constituted by a heteroaromatic cycle;an electron attractor group selected from NO.sub.2 and CN; andan electron effect transmitter group selected from an aromatic system of the phenyl ring type, or a chain having n atoms of carbon including a double or a triple bond (n<4).

Abstract: The invention relates to a method of manufacturing a film of polyparaphenylene by electro-polymerization, the method being the type using electrochemical reduction of a monomer having the following formula: ##STR1## where n is an integer lying in the range 1 to 4, the method taking place in an electrochemical cell (1) including a reference electrode (4), a working electrode (2), and a counter electrode (3), said electrodes being immersed in an electrolyte including one or more aprotic solvents, at least one of which is bipolar, and an anhydrous background salt in the presence of an organometallic catalyst of the NiX.sub.2 L type where X is a halogen and L is a binder, the working electrode being a solid cathode and the catalyst/monomer ratio lying in the range 0.1 to 1.

Abstract: The process includes an electrochemical reduction, under carbon dioxide atmosphere, of benzyl type ArCH.sub.2 X or ArCH(CH.sub.3)X halogenides.According to the invention, the process consists of operating in the presence of a catalyst containing at least one organometallic complex derived from a transition metal combined with a bidentate or tetradentate coordinate.