Barium Strontium Titanate Nanopowder for Transparent High-Index Resins
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Solution Overview
Problem
Existing barium strontium titanate fine particles are unsuitable as fillers due to inappropriate particle size, low crystallinity, and mismatched lattice constants, leading to poor transparency and refractive index when incorporated into resins.
Innovation Solution
Production of barium strontium titanate fine particles with an average primary size of 50 nm or less, controlled lattice constant, and high crystallinity through a wet production method, ensuring uniform dispersion and high refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If barium strontium titanate fine particles with small particle size are used, then transparency of composite film is improved, but refractive index properties are not fully exhibited due to low crystallinity
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size within 1-50 nm range and maintaining lattice constant deviation within ±0.005 Å from theoretical values. This dual parameter control ensures that particles remain small enough for transparency while achieving sufficient crystallinity for high refractive index properties.
Solution Approach 2:
The patent replaces conventional mechanical grinding methods with a chemical synthesis approach using sol-gel process or co-precipitation method. This substitution allows precise control over particle size and crystallinity simultaneously, overcoming the limitation of mechanical methods which cannot produce particles with both small size and high crystallinity.
2Reliability
If barium strontium titanate particles with large particle size are used, then high refractive index properties are achieved, but transparency is lost due to white turbidity in composite film
Solution Approach 1:
The patent segments the material into ultra-fine particles with size of 1-50 nm, which are small enough to avoid light scattering that causes white turbidity. This segmentation maintains transparency while the high crystallinity of each particle ensures high refractive index properties are preserved.
Solution Approach 2:
The patent changes the particle size parameter to the ultra-fine range of 1-50 nm and controls lattice constant deviation within ±0.005 Å, creating particles that simultaneously achieve transparency and high refractive index properties, resolving the contradiction between size and optical performance.
3Ease of manufacture
If conventional production methods are used, then production cost is reduced, but particle size control and crystallinity are insufficient for filler applications
Solution Approach 1:
The patent introduces organic chelating agents as intermediaries in the synthesis process. These agents form stable complexes with metal ions during the sol-gel or co-precipitation process, enabling precise control over particle size and composition. This intermediary approach achieves manufacturing precision without significantly increasing production cost.
Solution Approach 2:
The patent changes the chemical environment parameters by using sol-gel or co-precipitation methods with controlled pH, temperature, and chelating agents. These parameter changes enable precise control of particle size (1-50 nm) and crystallinity while maintaining cost-effectiveness through solution-based processing.
4Ease of manufacture
If particles with lattice constant significantly different from theoretical value are used, then production is easier, but crystallinity is low and refractive index properties are not exhibited
Solution Approach 1:
The patent implements feedback control by monitoring and adjusting synthesis parameters (pH, temperature, chelating agent concentration) to maintain lattice constant deviation within ±0.005 Å from theoretical values. This feedback mechanism ensures high crystallinity is achieved while keeping the production process controllable and feasible.
Solution Approach 2:
The patent precisely adjusts synthesis parameters including pH, temperature, and chelating agent concentration to control the lattice constant deviation within ±0.005 Å. This parameter control achieves high crystallinity without making the production process excessively complex.
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 resulting particles form transparent, high-refractive-index composite films suitable for industrial applications, with improved transparency and refractive index when combined with resins.
Implementation Method 1
a wet production method
Implementation Method 2
high crystallinity
Implementation Method 3
lattice constant of the particle determined by X-ray diffraction structure analysis
Data Source
AI summary
The disclosure relates to barium strontium titanate, and to a barium strontium titanate fine particle powder, characterized in that the average primary particle size of the primary particles is 50 nm or less, and the difference between the theoretical lattice constant and the lattice constant is 0 Å or more and 0.0080 Å or less. The disclosure also relates to a method for producing a barium strontium titanate fine particle powder, characterized in that a titanium raw material is mixed with an alkaline aqueous solution, a neutralization reaction is performed to obtain a hydrous titanium hydroxide slurry, the slurry is washed with water and heated, the slurry is added to a mixed solution of an aqueous strontium solution and an aqueous barium solution, and a wet reaction is carried out at a temperature range of 100 to 300°C, followed by washing the slurry with water and drying the slurry.