Abstract:
The invention relates to a spray pyrolysis method characterized in that it is used in the synthesis of nanoparticles with a closed structure of metal chalcogens having a lamellar crystalographic structure of general formula MaXb, wherein M represents a metal and X represents a chalcogen, a and b represent the respective proportions of metal and chalcogen, and in that it comprises pyrolysis of a liquid aerosol obtained from a solution of at least one metal precursor (M) and a chalcogen (X), or at least one precursor of said metal (M) and at least one precursor of said chalcogen (X) dissolved in a solvent, said solution being atomized into fine droplets in a suspension in a vector gas
Abstract:
The present invention provides a process for obtaining fullerene-like metal chalcogenide nanoparticles, comprising feeding a metal precursor selected from metal halide, metal carbonyl, organo-metallic compound and metal oxyhalide vapor into a reaction chamber towards a reaction zone to interact with a flow of at least one chalcogen material in gas phase, the temperature conditions in said reaction zone being such to enable the formation of the fullerene-like metal chalcogenide nanoparticles product. The present invention further provides novel IF metal chalcogenides nanoparticles with spherical shape and optionally having a very small or no hollow core exhibiting excellent tribological behaviour. The present invention further provides an apparatus for preparing various IF nanostructures.
Abstract:
The present invention provides a process for obtaining fullerene-like metal chalcogenide nanoparticles, comprising feeding a metal precursor (INi) selected from metal halide, metal carbonyl, organo-metallic compound and metal oxyhalide vapor into a reaction chamber (12) towards a reaction zone to interact with a flow of at least one chalcogen material (IN2) in gas phase, the temperature conditions in said reaction zone being such to enable the formation of the fullerene-like metal chalcogenide nanoparticles product. The present invention further provides novel IF metal chalcogenides nanoparticles with spherical shape and optionally having a very small or no hollow core and also exhibiting excellent tribological behavior. The present invention further provides an apparatus for preparing various IF nanostructures.
Abstract:
L'invention concerne un procédé de pyrolyse de spray, caractérisé en ce qu'il est appliqué à la synthèse de nanoparticules à structure fermée de chalcogénures de métaux de structure cristallographique lamellaire, de 5 formule générale M a X b , dans laquelle M représente un métal et X un chalcogène, a et b représentant les proportions respectives de métal et de chalcogène, et qu'il comprend une pyrolyse d'un aérosol liquide obtenu à partir d'une solution d'au moins un précurseur d'un métal (M) et d'un 10 chalcogène (X), ou d'au moins un précurseur dudit métal (M) et d'au moins un précurseur dudit chalcogène (X), dissous dans un solvant, ladite solution étant pulvérisée en fines gouttelettes en suspension dans un gaz vecteur.
Abstract:
In einem kontinuierlichen Verfahren zur Herstellung von nanoskaligen Metallsulfiden werden Nanopartikel aus Metall oder Metalloxid mit einem ersten Prozessgas, bestehend aus 10 bis 25 Vol.-% H2, 75 bis 90 Vol.-% H2S und 0 bis 15 Vol.-% eines Inertgases während einer Dauer von 30 bis 300 s bei einer Temperatur von 600 bis 900 °C fluidisiert und hieran anschließend auf einer Oberfläche eines Schüttbetts aus Nanopartikeln in einer Ofenkammer abgelegt und mit einem zweiten Prozessgas aus 10 bis 25 Vol.-% H2, 75 bis 90 Vol.-% H2S und 0 bis 15 Vol.-% eines Inertgases bei einer Temperatur von 600 bis 900 °C während einer Dauer von 30 bis 200 min sulfidiert. Ein nach dem Verfahren hergestelltes Material besteht aus 500 bis 100000 g Nanopartikeln aus Metallsulfid mit einem äquivalenten Durchmesser von 10 bis 200 nm. Eine Vorrichtung zur Herstellung von Nanopartikeln aus Metallsulfid, umfasst einen Vorlagebehälter für Nanopartikel aus Metall oder Metalloxid, eine Zuführeinrichtung, eine beheizte Fluidisierungskammer, eine beheizte Ofenkammer und eine Abführeinrichtung.
Abstract:
A method of preparing a graphene-metal chalcogenide porous material is provided. The method includes providing a dispersion comprising graphene oxide; adding a metal precursor and a chalcogenide precursor to the dispersion to form a mixture; heating the mixture under hydrothermal conditions to form a gel; and freeze drying the gel to obtain the graphene-metal chalcogenide porous material. A graphene-metal chalcogenide porous material prepared by the method, and use of the material in water treatment, energy storage, fire proofing, batteries or supercapacitors are also provided.
Abstract:
The present invention provides a method for producing a solution of nanosheets, comprising the step of contacting an intercalated layered material with a polar aprotic solvent to produce a solution of nanosheets, wherein the intercalated layered material is prepared from a layered material selected from the group consisting of a transition metal dichalcogenide, a transition metal monochalcogenide, a transition metal trichalcogenide, a transition metal oxide, a metal halide, an oxychalcogenide, an oxypnictide, an oxyhalide of a transition metal, a trioxide, a perovskite, a niobate, a ruthenate, a layered lll-VI semiconductor, black phosphorous and a V-VI layered compound. The invention also provides a solution of nanosheets and a plated material formed from nanosheets.
Abstract:
A method of preparing a graphene-metal chalcogenide porous material is provided. The method includes providing a dispersion comprising graphene oxide; adding a metal precursor and a chalcogenide precursor to the dispersion to form a mixture; heating the mixture under hydrothermal conditions to form a gel; and freeze drying the gel to obtain the graphene-metal chalcogenide porous material. A graphene-metal chalcogenide porous material prepared by the method, and use of the material in water treatment, energy storage, fire proofing, batteries or supercapacitors are also provided.