Near-infrared shielding material fine particle dispersion body, near-infrared shielding body and near-infrared shielding laminated structure, and method for producing the same
US-10562786-B2 · Feb 18, 2020 · US
Tungsten oxide powder and electrochromic device using the same
US12372843B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12372843-B2 |
| Application number | US-202318335335-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 15, 2023 |
| Priority date | Mar 17, 2021 |
| Publication date | Jul 29, 2025 |
| Grant date | Jul 29, 2025 |
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Abstract
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According to one embodiment, provided is a tungsten oxide powder including primary particles having an average particle size of 100 nm or less. Each of the primary particles include a crystal phase and an amorphous phase coexisting in each primary particle.
First claim
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What is claimed is: 1. A tungsten oxide powder comprising secondary particles, the secondary particles comprising primary particles having an average particle size of 100 nm or less, each of the primary particles comprising a crystal phase and an amorphous phase coexisting in each primary particle, wherein in each of the primary particles, the amorphous phase is present at a range of 80% to 100% of a peripheral length of the crystal phase, and the primary particles in the secondary particles are bonded via the amorphous phases thereof. 2. The tungsten oxide powder according to claim 1 , wherein in each of the primary particles, the amorphous phase is present at 100% of a peripheral length of the crystal phase. 3. The tungsten oxide powder according to claim 1 , wherein a ratio B 1 /A 1 of an area B 1 of the amorphous phase to an area A 1 of the crystal phase in each of the primary particles is within a range of 0.2 to 0.8. 4. The tungsten oxide powder according to claim 1 , wherein the average particle size is within a range of 5 nm to 20 nm. 5. The tungsten oxide powder according to claim 1 , comprising a tungsten oxide powder containing 0.01 mol % to 50 mol % of any one or more selected from the group consisting of potassium, sodium, lithium, and magnesium. 6. The tungsten oxide powder according to claim 1 , wherein a maximum width of the amorphous phase in each of the primary particles is 0.1 nm to 5 nm. 7. The tungsten oxide powder according to claim 6 , wherein a ratio B 1 /A 1 of an area B 1 of the amorphous phase to an area A 1 of the crystal phase in each of the primary particles is within a range of 0.2 to 0.8. 8. The tungsten oxide powder according to claim 7 , wherein the average particle size is within a range of 5 nm to 20 nm. 9. The tungsten oxide powder according to claim 8 , wherein a ratio B 2 /A 2 of an area B 2 of the amorphous phase to an area A 2 of the crystal phase in the secondary particles is within a range of 0.2 to 0.8. 10. The tungsten oxide powder according to claim 8 , for use in an electrochromic device. 11. The tungsten oxide powder according to claim 1 , for use in an electrochromic device. 12. An electrochromic device comprising an electrochromic layer, the electrochromic layer comprising the tungsten oxide powder according to claim 1 . 13. The electrochromic device according to claim 12 , wherein the electrochromic layer has a volume resistance value of 1×10 5 Ω·cm or less.
Assignees
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Classifications
- C09K9/00Primary
Tenebrescent materials, i.e. materials for which the range of wavelengths for energy absorption is changed as a result of excitation by some form of energy · CPC title
Optical properties, e.g. expressed in CIELAB-values · CPC title
Electric properties · CPC title
Nanometer sized, i.e. from 1-100 nanometer · CPC title
Agglomerated particles · CPC title
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Frequently asked questions
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- What does patent US12372843B2 cover?
- According to one embodiment, provided is a tungsten oxide powder including primary particles having an average particle size of 100 nm or less. Each of the primary particles include a crystal phase and an amorphous phase coexisting in each primary particle.
- Who is the assignee on this patent?
- Toshiba Kk, Toshiba Materials Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09K9/00. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Jul 29 2025 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).