Method for producing vanadium dioxide-containing particles

Abstract

The present invention addresses the problem of providing a method for producing vanadium dioxide-containing particles which have excellent thermochromic properties and storage stability. This method for producing vanadium dioxide-containing particles is characterized by including: a step of forming the vanadium dioxide-containing particles by a hydrothermal reaction; and a step of fracturing the vanadium dioxide-containing particles wherein the particle size of 80 number% or more of the vanadium dioxide-containing particles is 50 nm or less.

Description

technical field [0001] The present invention relates to a method for producing vanadium dioxide-containing particles, and more specifically, to a method for producing vanadium dioxide-containing particles excellent in thermochromism and storage stability. Background technique [0002] Vanadium dioxide (VO 2 ) particles have attracted attention as a material exhibiting a thermochromic phenomenon in which optical properties such as light transmittance and light reflectance change reversibly due to temperature changes. [0003] In the crystal structure of vanadium dioxide particles, polymorphisms of several crystal phases, such as A phase, B phase, C phase, and R phase (referred to as a so-called "rutile crystal phase"), exist. Among them, the crystal structure showing the above-mentioned thermochromic phenomenon is limited to the R phase. The R phase has a monoclinic structure below the transition temperature, and is therefore also called an M phase. [0004] In such vanadi...

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Problems solved by technology

[0009] In this patent document 2, the crushing method and conditions using a bead mill are introduced. However, if the particles with a large particle size are crushed, a large number of defective parts will be generated in the crystal structure, so the thermal discoloration and storage stability will be reduced.

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