Abstract: The invention relates to a photocatalytic carbon dioxide reduction method carried out in liquid and/or gas phase under irradiation, using a photocatalyst containing a first semiconductor, particles comprising one or more metallic-state elements M, and a second semiconductor SC, wherein the method is carried out by contacting a feedstock containing the CO2 and at least one sacrificial compound with the photocatalyst, then irradiating the photocatalyst such that the CO2 is reduced, and oxidising the sacrificial compound in order to produce an effluent containing at least in part C1 or above carbon molecules other than CO2.

Abstract: Process for preparing a porous monolith comprising between 10% and 100% by weight of a semiconductor relative to the total weight of the porous monolith, which process comprises the following steps: a) a first aqueous suspension containing polymer particles is prepared; b) a second aqueous suspension containing particles of least one inorganic semiconductor is prepared; c) the two aqueous suspensions prepared in steps a) and b) are mixed in order to obtain a paste; d) a heat treatment of the paste obtained in step c) is carried out in order to obtain the monolith with multimodal porosity.

Abstract: The invention relates to a porous monolith comprising between 20 wt.-% and 70 wt.-% TiO 2 relative to the total weight of the monolith, and between 30 wt.-% and 80 wt.-% a refractory oxide, selected from silica, alumina or silica-alumina, relative to the total weight of the monolith, characterized in that said porous monolith has a bulk density of less than 0.19 g/mL.

Abstract: The invention relates to a photocatalytic carbon dioxide reduction method carried out in liquid and/or gas phase under irradiation, using a photocatalyst containing a first semiconductor, particles comprising one or more metallic-state elements M, and a second semiconductor SC, wherein the method is carried out by contacting a feedstock containing the CO2 and at least one sacrificial compound with the photocatalyst, then irradiating the photocatalyst such that the CO2 is reduced, and oxidising the sacrificial compound in order to produce an effluent containing at least in part C1 or above carbon molecules other than CO2.

Abstract: Process for preparing a porous monolith comprising between 10% and 100% by weight of a semiconductor relative to the total weight of the porous monolith, which process comprises the following steps: a) a first aqueous suspension containing polymer particles is prepared; b) a second aqueous suspension containing particles of least one inorganic semiconductor is prepared; c) the two aqueous suspensions prepared in steps a) and b) are mixed in order to obtain a paste; d) a heat treatment of the paste obtained in step c) is carried out in order to obtain the monolith with multimodal porosity.

Abstract: The invention relates to a porous monolith comprising between 20 wt.-% and 70 wt.-% Ti0 2 relative to the total weight of the monolith, and between 30 wt.-% and 80 wt.-% a refractory oxide, selected from silica, alumina or silica-alumina, relative to the total weight of the monolith, characterized in that said porous monolith has a bulk density of less than 0.19 g/mL.

Abstract: Method for treating a gaseous feedstock containing molecular oxygen and one or more volatile compounds, which method comprises the following steps: a) bringing said gaseous feedstock containing molecular oxygen and one or more volatile organic compounds into contact with a monolith comprising silica and titanium dioxide, said monolith comprising a type-I macropore volume, of which the diameter of the pores is greater than 50 nm and less than or equal to 1000 nm, of between from 0.1 to 3 ml/g, and a type-II macropore volume, of which the diameter of the pores is greater than 1 ?m and less than or equal to 10 ?m, of between from 1 to 8 ml/g; b) irradiating said monolith with at least one irradiation source producing at least one wavelength lower than 400 nm in order to convert said volatile organic compounds into carbon dioxide, said step b) being carried out at a temperature between ?30° C. and +200° C. and at a pressure between 0.01 MPa and 70 MPa.

Abstract: A miniaturized electrochemical cell and a method for making it are provided. The method includes preparing at least one inner electrode of an electron conducting or semi-conducting material M1; providing a hollow support made of an electrically insulating material M6 and having at least one internal hollow channel; depositing on the external surface of the support a layer of an electrically conducting material M2; forming a template of colloidal particles of an electrically insulating material M3, on the M2 layer; depositing a layer of an electrically conducting material M4 on the M2 layer; depositing a layer L1 of an electron conducting or semi-conducting material M5 on the M4 layer, introducing the at least one inner electrode into the at least one internal hollow channel of the obtained structure; stabilizing the structure at its two open ends with an electrically insulating material M7; and removing M2, M3, M4 and M6 materials.

Abstract: A miniaturized electrochemical cell and a method for making it are provided. The method includes preparing at least one inner electrode of an electron conducting or semi-conducting material M1; providing a hollow support made of an electrically insulating material M6 and having at least one internal hollow channel; depositing on the external surface of the support a layer of an electrically conducting material M2; forming a template of colloidal particles of an electrically insulating material M3, on the M2 layer; depositing a layer of an electrically conducting material M4 on the M2 layer; depositing a layer L1 of an electron conducting or semi-conducting material M5 on the M4 layer, introducing the at least one inner electrode into the at least one internal hollow channel of the obtained structure; stabilizing the structure at its two open ends with an electrically insulating material M7; and removing M2, M3, M4 and M6 materials.

Abstract: A method for manufacturing a miniaturized electrochemical cell and a miniaturized electrochemical cell is provided. The method includes the following steps: a) forming a colloidal template of colloidal particles made of an electrically insulating material, on a substrate made of an electrically conducting material, b) depositing by electrodeposition in the void spaces of the colloidal template, at least three alternating layers forming a repeating unit, the alternating layers being made of an electron conducting material or a semi -conducting material, the intermediate layer(s) being made of a material M3 different from materials M1 and M2 constituting respectively the upper and lower layers, the material M3 having a standard potential lower than the standard potentials of the materials M1 and M2, c) removal of the material M3 of intermediate layer(s), and d) removal of the colloidal particles of the upper and lower layers to obtain the desired electrodes.

Abstract: The invention relates to nanometric or mesoscopic dissymmetric particles, and to a method for preparing the same. The particles have an inorganic part A and a spherical organic part B bound by physicochemical or covalent interactions. Material A is a metal oxide, a metal or a metal chalcogenide. Material B is a polymer consisting of recurrent units derived from a vinyl compound. The particles are obtained by modifying the surface of material A particles with a coupling agent C having a function FC which exhibits affinity for the polymer, and contacting the modified inorganic particles with the precursor(s) of the polymer B, in the presence of a free radical initiator and of a surfactant in solution in a solvent.

Abstract: Process for the production of a superhydrophobic fibrous substrate. The process involves preparing hydrophobic core-shell microparticles, the microparticles having a core of polyurethane and a shell of polydimethylsiloxane or of polybutadiene, then depositing a liquid suspension of the microparticles on the fibrous substrate. Superhydrophobic fibrous substrates of this kind are useful for the manufacture of textiles intended for apparel, or of coatings for printing.

Abstract: The invention relates to unsymmetrical nanoscale or mesoscopic particles, and to a method for preparing the same. Said particles are characterized by a surface F1 and the zone Z2 carries groups F2 different from the groups F1, the zone Z1 being free of groups F2 and the zone Z2 being free of groups F1. The method of preparation comprises the following steps: 1) the zone Z2 of the surface of the initial particles is masked by fixing a polymer nodule thereto; 2) the masked particles obtained at the end of step 1) are treated in order to modify the nonmasked surface zone Z1 thereof; 3) the polymer nodule is removed after modifying the zone Z1; 4) optionally, the surface of the zone Z2 of the particles is modified following the demasking process.

Abstract: The invention relates to nanometric or mesoscopic dissymmetric particles, and to a method for preparing the same. The particles have an inorganic part A and a spherical organic part B bound by physicochemical or covalent interactions. Material A is a metal oxide, a metal or a metal chalcogenide. Material B is a polymer consisting of recurrent units derived from a vinyl compound. The particles are obtained by modifying the surface of material A particles with a coupling agent C having a function FC which exhibits affinity for the polymer, and contacting the modified inorganic particles with the precursor(s) of the polymer B, in the presence of a free radical initiator and of a surfactant in solution in a solvent.