33 results about "Vanadium(IV) oxide" patented technology

The invention provides spectrum locally-modified hot color nano-composite powder and a preparation method thereof. The powder is of a multilayer composite core-shell structure which consists of a V2O layer, a precious metal layer and a transparent oxide layer, wherein the V2O layer serves as a core layer; the precious metal layer and the transparent oxide layer are respectively positioned on the second layer or the third layer. According to the spectrum locally-modified hot color nano-composite powder and the preparation method thereof, the precious metal layer and the transparent oxide layer coat the surfaces of V2O nano-particles, so that the stability of the V2O nano-particles can be improved, the spectral characteristics of V2O nano-powder can be adjusted, and the transmission color and the reflection color of the V2O nano-powder are adjusted; therefore, the aim of improving the color of the V2O powder is fulfilled. The powder can be widely applied to the fields of heat insulation coatings, lamination and the like, can be applied to an intelligent energy-saving coating, and can also be applied to the heat insulation places of glass, outer walls and the like.

The invention provides a preparation method of vanadium oxide / carbon nanometer tube composite materials with interpenetrating network structures. The carbon nanometer tubes with good conductivity are adopted for self assembly with single-dimensional vanadium oxide nanometer materials on the nanometer scale, so the carbon nanometer tubes have the effects of conductive bridges between all interwoven single-dimensional vanadium oxide nanometer materials for building interpenetrating network structures under the microcosmic dimensions, and the composite material with the structure can be used as a lithium ion injection material with high capacity and high stability. The method comprises the following preparation processes: using V2O5 collosol prepared by a quenching method as a vanadium source; using the carbon nanometer tubes dressed by sulphuric acid and nitric acid as assembly initiation sources; mixing and stirring the V2O5 collosol and the carbon nanometer tubes for more than 1 hour; then taking the reaction for 1 to 7 days through the water heating technology at 150 to 190 DEG C; washing and filtering obtained materials by deionized water for 2 to 5 times; and baking materials at 60 to 100 DEG C for obtaining the vanadium oxide / carbon nanometer tube composite materials with the interpenetrating network structures. The composite material has wide application when being used as the lithium ion injection material in the fields such as secondary lithium ion batteries, electrochromic devices, photoelectric switches, catalysis and sensors and the like.

The invention discloses a method for quickly preparing monoclinic phase VO2. In the method, metastable phase reactant containing vanadium or VOOH reactant reacts for 1 minute to 12 hours at the temperature of 200-500 DEG C in the atmosphere of inert gases or inert gases doped with oxygen, and the monoclinic phase VO2 is obtained after cooling. The method can quickly convert the metastable phase reactant containing vanadium or VOOH into the monoclinic phase VO2 under the protection of normal-pressure inert atmosphere. The method has simple technology, low cost, high yield and favorable purity and can quickly prepare the intelligent energy-saving monoclinic phase VO2 powder on a large scale.