Abstract: An optical structure comprising at least one stack having a central filter (1) and two sandwiching optical elements (2,3) between which the central filter (1) is interposed, wherein the central filter (1) is in a matrix material. The matrix material being doped with at least one doping agent, the central filter (1) and the two optical elements (2,3) on either side thereof being assembled by bonding layers (4a, 4b) of a material based on the same matrix material as that of the central filter, the optical elements (2,3) on either side of the central filter (1) and the bonding layers (4a, 4b) each having a refractive index equal to that of the material of the central filter or only differing from this refractive index within a range of plus or minus 0.05, preferably within a range of plus or minus 0.02.

Abstract: The present invention relates to a method for producing a microfluidic device, in particular, a sol-gel method for producing a microfluidic device in hybrid silica glass. The invention also relates to a microfluidic device obtainable by the method as described above and to microfluidic device in hybrid silica glass comprising at least one microchannel having a depth of at least 1 ?m, preferably between 1 ?m and 1 mm, and more preferably between 10 and 100 ?m.

Abstract: The present invention relates to a method for producing a microfluidic device, in particular, a sol-gel method for producing a microfluidic device in hybrid silica glass. The invention also relates to a microfluidic device obtainable by the method as described above and to microfluidic device in hybrid silica glass comprising at least one microchannel having a depth of at least 1 ?m, preferably between 1 ?m and 1 mm, and more preferably between 10 and 100 ?m.

Abstract: The present invention relates to a method for preparing nanoparticles at least partially consisting of rare earth fluoride, characterized in that said fluoride is produced, in a solution, from a salt of the corresponding rare earth element and from a charge-transfer complex of formula (I), where Ra, Rb, and Rc are as defined in claim 1.

Abstract: A method for depositing a photocatalytic coating on a support, the method having the steps: a) providing an aqueous and/or alcoholic suspension of nanoparticles of a semiconducting material, b) providing a sol in an aqueous and/or alcoholic solution of a hydrolyzed organosilane, c) mixing the suspension and the sol and proceeding with deposition of the obtained mixture on the support to be covered, d) performing a drying operation, e) and optionally producing an illumination of the obtained coating after drying at one wavelength at least causing activation of the semiconducting material, so as to remove at least 3% of the organic groups initially present in the coating and bound to the silicon atoms through a Si—C bond; as well as coatings with photocatalytic properties, materials, notably textiles, covered with such a coating and the use of such coatings and materials for photocatalysis.

Abstract: The invention concerns a preparation process of a hybrid organic-inorganic material including the following successive steps: a) preparation of a neutral organosilicon sol in at least one organic solvent, b) incorporation of a doping agent into the neutral organosiliconsol, and production of a doped sol, c) incorporation into the doped sol, of an accelerating agent in order to activate the subsequent gelation of the sol, d) condensation of the sol in order to obtain a crosslinked gel, e) drying of the gel and production of a stable doped gel. and the material obtainable by such a method.

Abstract: The invention concerns a preparation process of a hybrid organic-inorganic material including the following successive steps: a) preparation of a neutral organosilicon sol in at least one organic solvent, b) incorporation of a doping agent into the neutral organosiliconsol, and production of a doped sol, c) incorporation into the doped sol, of an accelerating agent in order to activate the subsequent gelation of the sol, d) condensation of the sol in order to obtain a crosslinked gel, e) drying of the gel and production of a stable doped gel. and the material obtainable by such a method.

Abstract: The invention relates to a piezochrome composite comprising a matrix of a piezoelectric material with particles of a spin transition compound. The invention also relates to a device that beside said composite also comprises a voltage supply connected to electrodes provided on said matrix. In one embodiment is this device provided with a temperature stabilising device.

Abstract: The object of the invention is new complexes of derivatives of thiacalix[4]arenes having the formula: R1a, R2a, R3a, R4a, R1b, R2b, R3b et R4b are such as defined in claim 1 and their utilization, especially for manufacturing of materials having optical limiter properties.

Abstract: The object of the invention is new complexes of derivatives of thiacalix[4]arenes having the formula: 1