Abstract: A method for analyzing a gaseous pollutant by means of a microfluid circuit includes a means for pumping a liquid and a means for trapping a gas, comprising the following steps: a) generating a flow of a liquid, the liquid comprising a selective derivative agent; b) trapping and dissolving gaseous pollutant in the flow; c) reaction of the pollutant with the selective derivative agent so as to form a liquid derivative compound; d) measuring the concentration of liquid derivative compound and determining the concentration of gaseous pollutant.

Abstract: A microfluidic device for analyzing a gaseous compound, in a dynamic manner and while flowing, the device including mixing elements that make it possible to co-elute in a capillary tube a gaseous phase including the gaseous compound and a solution including a derivative agent; elements for eliminating the gaseous phase; and elements for determining the concentration of a gaseous compound. A method for determining the concentration of a gaseous compound using the microfluidic device is also described.

Abstract: The preparation of graphene, mono-, bi- and multi-layers from graphite-based precursor materials, for example, pencil lead or graphite, by a method of mechanical thinning on the surface of a planar substrate with controlled roughness, followed by sonication in order to collect the graphene deposited on the substrate in a liquid medium. The bearing force during thinning by mechanical friction enables the number of graphene sheets deposited on the surface of the substrate to be controlled.

Abstract: An artificial retina that includes: (i) a substrate; (ii) a first layer, placed onto said substrate and including photovoltaic material portions separated by at least one insulating material portion; and (iii) a second layer, placed onto said first layer and including conductive material portions separated by at least one insulating material portion. In said artificial retina, the photovoltaic material includes a titanium dioxide semiconductor.

Abstract: An artificial retina that includes: (i) a substrate; (ii) a first layer, placed onto said substrate and including photovoltaic material portions separated by at least one insulating material portion; and (iii) a second layer, placed onto said first layer and including conductive material portions separated by at least one insulating material portion. In said artificial retina, the photovoltaic material includes a titanium dioxide semiconductor.

Abstract: The preparation of graphene, mono-, bi- and multi-layers from graphite-based precursor materials, for example, pencil lead or graphite, by a method of mechanical thinning on the surface of a planar substrate with controlled roughness, followed by sonication in order to collect the graphene deposited on the substrate in a liquid medium. The bearing force during thinning by mechanical friction enables the number of graphene sheets deposited on the surface of the substrate to be controlled.

Abstract: The invention relates to a photocatalyst comprising a cellular foam selected from carbon foam and the foam of a carbon material, such as a polymer, and a photocatalytically active phase, deposited directly on said cellular foam or on an intermediate phase deposited on said cellular foam. The average size of the cells is between 2500 ?m and 5000 ?m. The foam can comprise nanotubes or nanofibers (in particular TiO2).

Abstract: This invention relates to ?-SiC foam parts with a specific surface area preferably equal to at least 5 m2/g and with at least two zones A and B with a different cellular porosity distribution, wherein the parts were made by chemical transformation of a porous precursor medium comprising at least two blocks A? and B?, each having a different cellular porosity distribution, and in that the at least two zones A and B are derived from the chemical transformation of the two blocks A? and B?. This foam, optionally after deposition of an active layer, may be used as a filter medium in cartridges designed for the purification of exhaust gases. The invention also relates to manufacturing processes for preparing such a filter medium.

Abstract: The photocatalyst based on a composite WO3—SiC/TiO2 semiconductor and subjected to radiation whose wavelength is at least partly less than 400 nm gives1 photocatalytic oxidation of volatile organic compounds and leads to their total mineralisation into CO2 and H2O. The process for the photocatalytic purification of industrial, agricultural or domestic gaseous effluent may be conducted at room pressure and temperature. Its conversion rate is high and stable.

Abstract: The photocatalyst based on a composite WO3—SiC/TiO2 semiconductor and subjected to radiation whose wavelength is at least partly less than 400 nm gives photocatalytic oxidation of volatile organic compounds and leads to their total mineralisation into CO2 and H2O. The process for the photocatalytic purification of industrial, agricultural or domestic gaseous effluent may be conducted at room pressure and temperature. Its conversion rate is high and stable.

Abstract: This invention relates to ?-SiC foam parts with a specific surface area preferably equal to at least 5 m2/g and with at least two zones A and B with a different cellular porosity distribution, wherein the parts were made by chemical transformation of a porous precursor medium comprising at least two blocks A? and B?, each having a different cellular porosity distribution, and in that the at least two zones A and B are derived from the chemical transformation of the two blocks A? and B?. This foam, optionally after deposition of an active layer, may be used as a filter medium in cartridges designed for the purification of exhaust gases. The invention also relates to manufacturing processes for preparing such a filter medium.