Hexagonal Tungsten Oxide Particles for NIR Shielding Transparency
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Solution Overview
Problem
Existing complex tungsten oxide particles lack sufficient visible light transparency and infrared ray shielding performance compared to known materials.
Innovation Solution
Complex tungsten oxide particles with a hexagonal crystal structure, represented by M x W y O z (where 0.20 ≤ x/y ≤ 0.37 and 2.2 ≤ z/y ≤ 3.3), having a controlled particle diameter of 800 nm or less, and specific W atom defects observed in STEM-HAADF images, enhance transparency and shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If complex tungsten oxide particles are used for near-infrared ray shielding, then infrared ray shielding ability is improved, but visible light transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the compositional parameters (x, y, z in MxWyOz) within specific ranges (0.20≤x/y≤0.37, 2.2≤z/y≤3.3) to optimize the balance between infrared shielding and visible transparency. This systematic parameter optimization resolves the contradiction by finding the optimal composition point that simultaneously achieves both performance requirements
Solution Approach 2:
The patent introduces local quality by creating specific W atom defects (dark spots in STEM-HAADF images) within the crystal structure. These localized defects concentrate the infrared absorption capability in specific regions while maintaining the overall crystal structure integrity that enables visible light transparency, thus resolving the contradiction between shielding ability and transparency
2Illumination intensity
If particle size is reduced to improve transparency, then visible light transparency is improved, but infrared ray shielding performance deteriorates
Solution Approach 1:
The patent applies parameter changes by establishing a specific particle size range (800 nm or less) that optimizes the balance between scattering of visible light and absorption of infrared rays. This size parameter optimization allows the particles to maintain transparency while preserving infrared shielding capability
3Manufacturing precision
If synthesis time is extended to improve particle uniformity, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the synthesis temperature range (400-700°C) and time parameters to achieve particle formation within 1-48 hours. This parameter optimization balances the need for uniform particle structure with production efficiency, resolving the contradiction between precision and productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides complex tungsten oxide particles with improved visible light transparency and infrared ray shielding, maintaining high visibility while efficiently absorbing near-infrared rays.
Implementation Method 1
maintaining high visibility while efficiently absorbing near-infrared rays
Data Source
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AI summary
Complex tungsten oxide particles include complex tungsten oxide represented by a general formula: MxWyOz (where, the M element is at least one element selected from the group consisting of alkali metal elements, alkaline earth metal elements, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I; W is tungsten; O is oxygen; 0.20 ≤ x/y ≤ 0.37; and 2.2 ≤ z/y ≤ 3.3). A crystal system of the complex tungsten oxide is hexagonal. An STEM-HAADF image observation of the complex tungsten oxide particles at [001] incidence includes a spot in a number ratio of 0.01% or greater and 10% or less, where the spot is a spot at which a value of a Z-contrast of tungsten atoms is reduced to be 95% or lower of an average value of the Z-contrast of tungsten atoms.