Abstract: A method of preparing a crystalline thin film having a formula MY2 includes (1) preparing an MYx amorphous film by atomic layer deposition on a surface of a substrate, and (2) annealing the amorphous MYx film at 350° C. or more to provide the crystalline MY2 film. The amorphous MYx film is formed from at least one metal M precursor and at least one element Y precursor, wherein x is 1.5 to 3.1, M is tungsten or molybdenum, and Y is sulfur or selenium. Step (1) includes a) introducing a first metal M precursor or element Y precursor into a deposition chamber, b) purging with inert gas, c) introducing a second metal M precursor when the first precursor is element Y, or element Y precursor when the first precursor is metal M, d) purging with inert gas, e) repeating steps a) to d), and f) obtaining the amorphous MYx film.

Abstract: An optical particle detector including at least one channel intended to receive a fluid carrying at least one particle, and across which light rays are intended to pass such that the light rays are partially scattered by the at least one particle, a plurality of photodetectors capable of receiving said scattered light rays, wherein the detector includes at least one optical waveguide configured to collect, at least at one entrance of the waveguide, light rays that were not scattered by the at least one particle and having crossed the channel, and to reinject the unscattered light rays into the channel through at least one exit of the waveguide.

Abstract: A multilayer scintillation detector, includes at least three layers superposed on one another, and each extending parallel to a plane, called the detection plane, wherein each layer is formed by a first material, called a scintillation material, capable of interacting with an ionizing radiation and of forming, following the interaction, a scintillation light in a scintillation spectral band; each layer has a plurality of light guides, respectively extending parallel to the detection plane, according to a length, the light guides being disposed, over all or part of their length, parallel to an axis of orientation; the axis of orientation of the light guides of each layer is oriented, in the detection plane, according to an orientation, the orientations of the respective axes of orientation of at least three layers being different from one another, such that each layer has an associated orientation; and the scintillation material has a first refractive index.

Abstract: Nanoparticles that can be used as hydrosilylation and dehydrogenative silylation catalysts. The nanoparticles have at least one transition metal with an oxidation state of 0, chosen from the metals of columns 8, 9 and 10 of the periodic table, and at least one carbonyl ligand, preferably a silicide.

Abstract: A method of preparing a crystalline thin film having a formula MY2 includes (1) preparing an MYx amorphous film by atomic layer deposition on a surface of a substrate, and (2) annealing the amorphous MYx film at 350° C. or more to provide the crystalline MY2 film. The amorphous MYx film is formed from at least one metal M precursor and at least one element Y precursor, wherein x is 1.5 to 3.1, M is tungsten or molybdenum, and Y is sulfur or selenium. Step (1) includes a) introducing a first metal M precursor or element Y precursor into a deposition chamber, b) purging with inert gas, c) introducing a second metal M precursor when the first precursor is element Y, or element Y precursor when the first precursor is metal M, d) purging with inert gas, e) repeating steps a) to d), and f) obtaining the amorphous MYx film.

Abstract: A compound and the use thereof to prepare a functional or telechelic polyolefin is provided. The compound has the following formula (II): Y((CH2)p—B?)m??(II), wherein m=2 or 3; Y being an alkaline earth metal or zinc when m=2, Y being aluminum when m=3; B? being selected from the group comprising N(SiMe3)2; N(SiMe2CH2CH2SiMe2); C6F5; C3F7; C6F13; para-C6H4—NMe2; para-C6H4—O-Me; para-C6H4—N(SiMe3)2; and CH(OCH2CH2O); and p being an integer from 0 to 50.

Abstract: The invention herein pertains to a telechelic polyolefin of formula (III) or (IV) and to a process for its preparation, Z-A-(CH2)p—B???(III) Z-A-(CH2)p—B??(IV) A being a polymer chain obtained by homopolymerization of ethylene or by copolymerization of ethylene and an alpha-monoolefin; B? being selected from the group consisting of N(SiMe3)2; N(SiMe2CH2CH2SiMe2); para-C6H4(NMe2); para-C6H4(OMe); C6H4(N(SiMe3)2); ortho-CH2—C6H4NMe2; ortho-CH2—C6H4OMe; C6F5; C3F7; C6F13; CH(OCH2CH2O); B being the function B? or a function derived from B?; p being an integer from 0 to 50, advantageously from 0 to 11; Z being a function selected from the group consisting of halogens; thiols; thiol derivatives; azides; amines; alcohols; carboxylic acid function; isocyanates; silanes; phosphorus derivatives; dithioesters; dithiocarbamates; dithiocarbonates; trithiocarbonates; alkoxyamines; vinyl function; dienes; and the group -A-(CH2)p—B?.

Abstract: Telechelic polyolefin of formula(I) and its derivatives: CH2?CH—(CH2)p-A-Z??(I) wherein: A represents a (co)polymer comprising at least 95 mol % of (CH2—CH2) units; Z is selected from the group comprising halogens, thiols and their derivatives, azides, amines, alcohols, the carboxylic acid function, isocyanates, silanes, phosphorous derivatives, dithioesters, dithiocarbamates, dithiocarbonates, trithiocarbonates, alkoxyamines, the vinyl function, dienes, and the group -A-(CH2)p—CH?CH2; p is a whole number between 1 and 20, most advantageously between 6 and 9.

Abstract: Telechelic polyolefin of formula(I) and its derivatives: CH2?CH—(CH2)p-A-Z ??(I) wherein: A represents a (co)polymer comprising at least 95 mol % of (CH2—CH2) units; Z is selected from the group comprising halogens, thiols and their derivatives, azides, amines, alcohols, the carboxylic acid function, isocyanates, silanes, phosphorous derivatives, dithioesters, dithiocarbamates, dithiocarbonates, trithiocarbonates, alkoxyamines, the vinyl function, dienes, and the group —A—(CH2)p-CH?CH2; p is a whole number between 1 and 20, most advantageously between 6 and 9.

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: The invention relates to a method for metathesis of one or several reagents comprising a linear or branched hydrocarbon chain containing a double olefinic bond Csp2?Csp2 consisting in reacting said reagent or reagents with a supported metal compound comprising an aluminum oxide-based support to which a tungsten hydride is grafted. Typically, each said reagent or reagents comprises from 2 to 30 carbon atoms. The reagent can be embodied in the form of olefin. The inventive method can be used, for example for producing propylene from ethylene and butane.

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.