Abstract: Disclosed is a method for producing particles, including the steps: introducing, into a reaction chamber, at least one reaction flow including a first chemical element and propagating in a direction of flow; projecting a radiation beam through the reaction chamber, intersecting each reaction stream in one interaction area per reaction flow, to form, in each reaction flow, particle cores including the first chemical element; and introducing, into the reaction chamber, a second chemical element interacting with each reaction flow to cover the particle cores with a layer including the second chemical element. Each reaction flow is preferably free of any agent oxidizing the first chemical element. Preferably a ratio of one atom of the second element is introduced per unit of time for at least two atoms of the first element introduced per unit of time. The second element is preferably introduced in at least one confined flow.

Abstract: A method for producing particles, includes the following steps: introducing into a reaction chamber at least one reaction flow including a first chemical element (typically silicon) and propagating in a flow direction; projecting a ray beam through the reaction chamber, intersecting each reaction flow in an reaction flow interaction area, in order to form, in each reaction flow, the cores of particles including the first chemical element, and introducing, in the reaction chamber, a second chemical element, interacting with each reaction flow in order to cover the cores of particles with a layer including the second chemical element. Each reaction flow is preferably free of an agent oxidizing the first chemical element.

Abstract: A container with improved sealing, for improved security in the event of loading, transporting and/or unloading submicron particles, in particular nanopowder/nanoparticles, includes a connector for injecting liquid and/or gas. Such a container can also contain at least one inflatable seal (40) valve (3; 4). The container is provided with elements for changing the physical state of the material by heating, mixing or ultrasound bombardment. A method for using the container and an inflatable seal valve are also described.

Abstract: A method for producing particles, includes the following steps: introducing into a reaction chamber at least one reaction flow including a first chemical element (typically silicon) and propagating in a flow direction; projecting a ray beam through the reaction chamber, intersecting each reaction flow in an reaction flow interaction area, in order to form, in each reaction flow, the cores of particles including the first chemical element, and introducing, in the reaction chamber, a second chemical element, interacting with each reaction flow in order to cover the cores of particles with a layer including the second chemical element. Each reaction flow is preferably free of an agent oxidizing the first chemical element.

Abstract: A method is followed to prepare a powder that includes carbon, silicon and boron, the silicon being in silicon carbide form and the boron being in boron carbide and/or free boron form. The method includes contacting a carbon-based precursor, a silicon-based precursor and a boron-based precursor BX3, X being a halogen atom, to obtain a mixture of these three precursors. The resulting mixture is subjected to laser pyrolysis. The boron-based precursor BX3 is heated, prior to the contacting step and/or simultaneously with the contacting step, to a temperature higher than the condensation temperature of the precursor.

Abstract: Disclosed is a method for producing particles, including the steps: introducing, into a reaction chamber, at least one reaction flow including a first chemical element and propagating in a direction of flow; projecting a radiation beam through the reaction chamber, intersecting each reaction stream in one interaction area per reaction flow, to form, in each reaction flow, particle cores including the first chemical element; and introducing, into the reaction chamber, a second chemical element interacting with each reaction flow to cover the particle cores with a layer including the second chemical element. Each reaction flow is preferably free of any agent oxidizing the first chemical element. Preferably a ratio of one atom of the second element is introduced per unit of time for at least two atoms of the first element introduced per unit of time. The second element is preferably introduced in at least one confined flow.

Abstract: The invention relates to powder comprising at least one element M, at least one element A and at least one element X, in the respective proportions (n+1±?1), 1±?2 and n±?3, in which: A is chosen from Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, P, As and S; M is a transition metal; X is chosen from B, C and N; n is an integer equal to 1, 2 or 3; and ?1, ?2 and ?3 independently represent a number ranging from 0 to 0.2, said powder having a mean particle size of less than 500 nm.

Abstract: The invention relates to a system for continuous flow production of nanometric or sub-micrometric powders under the action of laser pyrolysis by interaction between a beam emitted by a laser and a flow of reagents emitted by at least one injector, wherein the laser is followed by an optical device allowing the energy of the beam to be distributed along an axis perpendicular to the axis of the flow of reagents, in an elongated cross-section with adjustable dimensions at least at one interaction area between this beam and the flow of reagents emitted by at least two injectors located perpendicularly to the axis of the beam. It also concerns a method for producing such powders.

Abstract: A container with improved sealing, for improved security in the event of loading, transporting and/or unloading submicron particles, in particular nanopowder/nanoparticles, includes a connector for injecting liquid and/or gas. Such a container can also contain at least one inflatable seal (40) valve (3; 4). The container is provided with elements for changing the physical state of the material by heating, mixing or ultrasound bombardment. A method for using the container and an inflatable seal valve are also described.

Abstract: The invention relates to a process for preparation of a part comprising silicon carbide with an average nanometric grain size and a relative density of more than 97%, said process comprising: a preform formation step by cold compaction of a nanometric silicon carbide powder or the formation of agglomerates of such a powder by granulation of the powder; a spark plasma sintering step of said preform or said agglomerates, without the addition of sintering, at at least one predetermined temperature and pressure so as to obtain the required relative density and average grain size, namely a relative density of more than 97% and a nanometric average grain size.

Abstract: A system and process for production of nanometric or sub-micrometric powders in continuous flux under the action of laser pyrolysis in at least one interaction zone between a beam emitted by a laser and a flux of reagents emitted by an injector, in which the laser is followed by optical means for distributing the energy of the beam emitted by the latter according to an axis perpendicular to the axis of each flux of reagents, in an elongated cross-section having adjustable dimensions at the level of this at least one interaction zone.

Abstract: The invention relates to a gas phase method for producing nanometric particles in a reactor for producing particles in a gas phase, in which there is an interaction between a reaction flow and an energy flow. This method comprises the following steps: a step for coupling a device for producing gaseous chlorides with this reactor, a step for producing gaseous chlorides from a base precursor in the form of powders, and a step for injecting such a reaction flow into the reactor.

Abstract: A method is followed to prepare a powder that includes carbon, silicon and boron, the silicon being in silicon carbide form and the boron being in boron carbide and/or free boron form. The method includes contacting a carbon-based precursor, a silicon-based precursor and a boron-based precursor BX3, X being a halogen atom, to obtain a mixture of these three precursors. The resulting mixture is subjected to laser pyrolysis. The boron-based precursor BX3 is heated, prior to the contacting step and/or simultaneously with the contacting step, to a temperature higher than the condensation temperature of the precursor.

Abstract: The invention relates to a process for preparation of a part comprising silicon carbide with an average nanometric grain size and a relative density of more than 97%, said process comprising: a preform formation step by cold compaction of a nanometric silicon carbide powder or the formation of agglomerates of such a powder by granulation of the powder; a spark plasma sintering step of said preform or said agglomerates, without the addition of sintering, at at least one predetermined temperature and pressure so as to obtain the required relative density and average grain size, namely a relative density of more than 97% and a nanometric average grain size.

Abstract: The invention relates to powder comprising at least one element M, at least one element A and at least one element X, in the respective proportions (n+1±?1), 1±?2 and n±?3, in which: A is chosen from Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, P, As and S; M is a transition metal; X is chosen from B, C and N; n is an integer equal to 1, 2 or 3; and ?1, ?2 and ?3 independently represent a number ranging from 0 to 0.2, said powder having a mean particle size of less than 500 nm.

Abstract: The invention relates to a gas phase method for producing nanometric particles (10) in a reactor (11) for producing particles in a gas phase, in which there is an interaction between a reaction flow (14) and an energy flow (15). This method comprises the following steps: a step for coupling a device for producing gaseous chlorides (12) with this reactor (11), a step for producing gaseous chlorides from a base precursor in the form of powders (20), and a step for injecting such a reaction flow (14) into the reactor (11).

Abstract: The invention relates to a system for continuous flow production of nanometric or sub-micrometric powders under the action of laser pyrolysis by interaction between a beam emitted by a laser and a flow of reagents emitted by at least one injector, wherein the laser is followed by an optical device allowing the energy of the beam to be distributed along an axis perpendicular to the axis of the flow of reagents, in an elongated cross-section with adjustable dimensions at least at one interaction area between this beam and the flow of reagents emitted by at least two injectors located perpendicularly to the axis of the beam. It also concerns a method for producing such powders.

Abstract: The invention relates a method for the production of stabilised suspensions of nanometric or submicrometric particles, which is a method contained in a continuous flow that includes a step (20) for the placing in suspension, dispersion and/or functionalisation of these particles produced in a gaseous stream containing the particles at the output of a reactor in a stream of at least one liquid. The invention also relates a device that implements this method.

Abstract: The invention relates to a system for production of nanometric or sub-micrometric powders in continuous flux under the action of laser pyrolysis in at least one interaction zone between a beam (11) emitted by a laser (10) and a flux of reagents (13) emitted by an injector (14), in which the laser is followed by optical means (12) for distributing the energy of the beam emitted by the latter according to an axis perpendicular to the axis of each flux of reagents, in an elongated cross-section having adjustable dimensions at the level of this at least one interaction zone. It also relates to a process for production of such powders.