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Vanadium oxide-containing particles each having core-shell structure

A technology of vanadium oxide and shell structure, applied in vanadium oxide, inorganic chemistry, vanadium compounds, etc., can solve the problems of large refractive index difference, insufficient dispersion, unstable vanadium dioxide, etc., and achieve thermochromic and durable Excellent performance and improved durability

Inactive Publication Date: 2017-08-18
KONICA MINOLTA INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the general wet surface modification methods disclosed in Patent Documents 1 and 2, since the particles are subjected to surface modification after a drying process, vanadium dioxide is very unstable. As a result, if the particle is deteriorated before surface modification Already carried out, or if condensation occurs, sufficient surface modification cannot be performed
[0007] In addition, Patent Document 3 also discloses a technique for preventing particle deterioration by performing surface modification, but it is considered that since the vanadium dioxide powder is redispersed to perform surface modification, the particles are already agglomerated when the powder is formed, and the dispersion is insufficient.
[0008] In addition, in surface modification using silane coupling agents, etc., because vanadium dioxide particles and SiO 2 The difference in refractive index is large, so the light is in the vanadium dioxide particles and SiO 2 The interface will be reflected, and the thermochromism cannot be obtained effectively

Method used

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  • Vanadium oxide-containing particles each having core-shell structure
  • Vanadium oxide-containing particles each having core-shell structure

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Embodiment

[0113] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to this. In addition, the expression "%" used in an Example means "mass %" unless otherwise specified.

[0114] "Preparation of Aqueous Dispersion of Particles Containing Vanadium Dioxide"

[0115] Add vanadium pentoxide (V) (V 2 o 5 , special grade, Wako Pure Chemical Co., Ltd.) 0.5g, after stirring at 30°C for 4 hours, slowly dropwise added hydrazine hydrate (N 2 h 4 - H2O, special grade, Wako Pure Chemical Industries, Ltd.) 5% by mass aqueous solution to prepare a solution having a pH (25° C.) of 4.2.

[0116] Put the prepared mixed solution in a HU 50ml kit (pressure-resistant stainless steel outer cylinder, PTFE sample container HUTc-50: manufactured by Sanai Scientific Co., Ltd.), and heat at 100°C for 8 hours After that, hydrothermal reaction treatment at 270° C. for 48 hours was performed.

[0117] The resulting product was washed by ultrafiltration to pr...

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Abstract

The present invention addresses the problem of providing vanadium oxide-containing particles each having a core-shell structure, which have excellent thermochromic properties and durability. The vanadium oxide-containing particles (1) each having a core-shell structure according to the present invention are characterized in that a core layer (2) contains vanadium dioxide as the main component and a shell layer (4) contains vanadium oxide containing vanadium having a valency other than 4 as the main component.

Description

technical field [0001] The present invention relates to particles containing vanadium oxide having a core-shell structure. More specifically, it relates to vanadium oxide-containing particles having a core-shell structure excellent in thermochromism and durability. Background technique [0002] Vanadium dioxide (VO 2 ) has attracted attention as a material exhibiting a thermochromic phenomenon in which optical properties such as light absorption rate and light reflectance change reversibly due to temperature changes. [0003] Here, in the crystal structure of vanadium dioxide, polycrystals of several crystal phases such as A phase, B phase, C phase, and R phase (that is, so-called "rutile crystal phase") exist. Among them, the crystal structure exhibiting the thermochromic phenomenon as described above is limited to the R phase. When the R phase is below the transition temperature, it has a monoclinic structure, so it is also called M phase. In order to exhibit substanti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00C09K9/00
CPCC01G31/02C01P2004/64C01P2004/80C01P2004/82C01P2004/84C01P2006/32C01P2006/60C09C1/00C09K9/00G02F1/009
Inventor 鹫巢贵志
Owner KONICA MINOLTA INC