Abstract: A copolymer containing a unit including an optionally neutralised styrene sulphonic acid unit and a unit containing at least one optionally neutralised (poly)carboxylic acid unit or a (poly)amido-amine unit, to inhibit or slow the formation of sulphide deposits during the extraction of gas or oil. It also relates to a method to inhibit or slow the formation of sulphide deposits during the extraction of gas or oil, including the injection of a fluid containing the abovementioned copolymer into a wellbore, a subterranean formation or a gas or oil well.

Abstract: The present invention relates to the development of tracer fluids, more generally, that of aqueous liquids, intended to be injected under pressure in an oil reservoir, for example from an injection well up to a production well. The object of the invention is to propose a new method of study of a solid medium, i.e. an oil reservoir, by diffusion of a liquid (i.e. injection waters) containing tracers, through said solid medium, which is simple to implement and economical and which remedies the drawbacks of the known tracers for injection waters of oil reservoirs.

Abstract: The invention relates to a novel use of ultrafine nanoparticles, of use as a diagnostic, therapeutic or theranostic agent, characterized by their mode of administration via the airways. The invention is also directed toward the applications which follow from this novel mode of administration, in particular for imaging the lungs, and the diagnosis or prognosis of pathological pulmonary conditions. In the therapeutic field, the applications envisioned are those of radiosensitizing or radioactive agents for radiotherapy (and optionally curietherapy), or for neutron therapy, or of agents for PDT (photodynamic therapy), in particular for the treatment of lung tumors.

Abstract: The fluid tracers according to the invention have the advantage of producing a memory effect fluorescent signal, that is to say a signal modified as a function of the physico-chemical conditions encountered in the medium through which the nanoparticles pass after injection into the geological underground area. The analysis of fluorescent signals in the fluids collected after diffusion makes it possible to deduce therefrom information on the characteristics of the oil reservoir.

Abstract: This invention relates to the development of nanoparticles, which can be used as tracers, in order to track the movement of fluids injected into an oil reservoir. The injected fluids diffuse through a solid geological medium which constitutes the oil reservoir, thus making it possible to study this latter by following the path of the injected fluids. The objective is in particular to monitor the flows between the injection well(s) and the production well(s) and/or to evaluate the volumes of oil in reserve and water in the reservoir and ultimately to optimize oil exploration and exploitation.

Abstract: The invention relates to novel biocompatible hybrid nanoparticles of very small size, useful in particular for diagnostics and/or therapy. The purpose of the invention is to offer novel nanoparticles which are useful in particular as contrast agents in imaging (e.g. MRI) and/or in other diagnostic techniques and/or as therapeutic agents, which give better performance than the known nanoparticles of the same type and which combine both a small size (for example less than 20 nm) and a high loading with metals (e.g. rare earths), in particular so as to have, in imaging (e.g. MRI), strong intensification and a correct response (increased relaxivity) at high frequencies.

Abstract: The present invention relates to the development of tracer fluids, more generally, that of aqueous liquids, intended to be injected under pressure in an oil reservoir, for example from an injection well up to a production well. The object of the invention is to propose a new method of study of a solid medium, i.e. an oil reservoir, by diffusion of a liquid (i.e. injection waters) containing tracers, through said solid medium, which is simple to implement and economical and which remedies the drawbacks of the known tracers for injection waters of oil reservoirs.

Abstract: The invention concerns hybrid nanoparticles containing: a nanosphere, of mean diameter included in the range from 2 to 9 nm, of which at least 90% by weight consists of Ln2O3 where Ln represents a rare earth, optionally doped with a rare earth or an actinide, or a mixture of rare earths, or a rare earth and actinide mixture, in which at least 50% of the metal ions are rare earth ions, a coating around the nanosphere chiefly consisting of functionalized polysiloxane, having a mean thickness included in the range from 0.5 to 10 nm, preferably greater than 2 nm and no more than 10 nm, and at least one biological ligand grafted by covalent bonding to the polysiloxane coating and their method of preparation.

Abstract: The invention relates to the use of nanoparticles with dimensions comprised between 1 and 50 nm, at least one portion of which consists of at least one oxide and/or one oxohydroxide of at least one lanthanide, said nanoparticles: either consisting of at least one oxide and/or one oxohydroxide of at least one lanthanide, or in the form of nanoparticles comprising a core consisting of at least one oxide and/or one oxohydroxide of at least one lanthanide, and a coating consisting of polysiloxane, with possibly organic molecules grafted at the surface or comprised inside it, as a radio-sensitizing agent in the making of an injectable composition intended to improve the efficiency of the treatment of a tumor by X or gamma irradiations.

Abstract: This invention relates to a process for modifying aramid fibers so as to improve their capacity to be dyed, including the following steps: a) a step of treating said fibers so as to reduce the glass transition temperature Tg thereof to a value Tg1, in which Tg1 is lower than Tg; b) a step of contacting said fibers thus treated with a solution including nanoparticles at a temperature above or equal to Tg1.

Abstract: The invention concerns hybrid nanoparticles containing: a nanosphere, of mean diameter included in the range from 2 to 9 nm, of which at least 90% by weight consists of Ln2O3 where Ln represents a rare earth, optionally doped with a rare earth or an actinide, or a mixture of rare earths, or a rare earth and actinide mixture, in which at least 50% of the metal ions are rare earth ions, a coating around the nanosphere chiefly consisting of functionalized polysiloxane, having a mean thickness included in the range from 0.5 to 10 nm, preferably greater than 2 nm and no more than 10 nm, and at least one biological ligand grafted by covalent bonding to the polysiloxane coating and their method of preparation.

Abstract: Hybrid probe particles comprising a nanoparticle of gold of diameter in the range extending from 2 to 30 nm on the surface of which, on the one hand, at least one, and preferably from one to 100, organic probe molecules are grafted by gold-sulphur bonds and on the other hand, at least 10, and preferably 10 to 10000, molecules with luminescent activity, as well as their preparation process.

Abstract: The invention relates to a crucible (I) adapted for growing a large crystal, starting with an adequate raw material, comprising a receptacle (1) intended to accommodate the large crystal, wherein moreover, directly beneath the receptacle (1) a vertical succession of at least two containers (31, 32, 33, 3n) is located, with each container being connected by a restriction zone (41, 42, 43, 4n) to the successive container located directly above, and with the upper container (33, 3n) being connected by a restriction zone (43, 4n) to the receptacle (1), as well as a growth method that implements said crucible.

Abstract: A material composed of ultrafine particles, comprising at least a metal element M having catalytic properties and at least a metal element M′ having a standard oxidation potential less than that of M, part at least of M′ atoms being in oxidized form, the average size of the particles being less than 50 nm, at least 80% in number of the particles having an average size less than 10 nm. One particle of the material is constituted by at least a metal element M with oxidation level 0, or by at least a metal element M′ in oxidized form, or by at least a metal element M′ with oxidation level 0, or by the combination of at least two species selected from the three previous species. The material is useful as a catalyst for hydrogenation or coupling reactions.

Abstract: The invention concerns ultrafine polymetallic particles obtained from reducing a mixture of salts dissolved in an organic solvent by an alkali or alkaline earth metal hydride, at a temperature not higher than the solvent reflux temperature, the mixture of dissolved salts comprising at least a salt of a metal having a standard oxidant potential E°Mn+/M at 25° C. higher than −1.18 V. The invention is applicable to the hydrogenation of olefins and the coupling of halogenated aromatic derivatives.