Core-Shell Particle Radiation Diffraction Colorants
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Solution Overview
Problem
There is a need for durable goniochromatic materials that can be produced in particulate form with minimal haze, suitable for use as colorants that exhibit varying perceived color with the angle of illumination or observation.
Innovation Solution
A radiation diffraction material comprising an ordered periodic array of core-shell particles held in a polymeric matrix, where the particles have a core surrounded by a non-film forming shell, arranged to diffract radiation, and the shells are swollen by diffusing components of the matrix to create a refractive index gradient, allowing for controlled wavelength and intensity of diffracted radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sheet-like particles (metallic or interference pigments) are used to produce goniochromatic effects, then directional light reflection and color variation with angle are achieved, but the materials lack durability and produce significant haze
Solution Approach 1:
The patent employs composite core-shell particles where the core provides structural stability and the shell provides optical properties. The core is formed from a first material and the shell from a second material with different refractive indices, creating a composite structure that combines the durability of the core with the optical effects of the shell, eliminating haze while maintaining goniochromatic properties
Solution Approach 2:
The patent creates local refractive index contrast through the core-shell structure, where the shell thickness and material composition are specifically designed to provide the necessary optical properties at the particle interface. This local quality enhancement enables Bragg diffraction without requiring the entire particle structure to be complex, thereby reducing haze while maintaining durability
2Object-generated harmful factors
If the shell material is made non-film forming to maintain particle dispersion, then minimal haze is achieved, but the shells cannot provide structural support
Solution Approach 1:
The patent divides the particle into distinct functional segments: the core provides structural support and mechanical strength, while the shell provides optical properties and refractive index contrast. This segmentation allows each component to optimize its specific function without compromising the other, enabling non-film forming shells that maintain particle dispersion while the core ensures structural integrity
Solution Approach 2:
The core acts as an intermediary structure that supports the shell without requiring the shell to be film-forming. The core-shell interface provides the necessary structural connection, allowing the shell to remain non-film forming and maintain particle dispersion while the core provides the structural support that would otherwise be required from the shell itself
3Manufacturing precision
If ordered periodic arrays of particles are used to achieve Bragg diffraction, then controlled wavelength and intensity of diffracted radiation are achieved, but the manufacturing process becomes complex
Solution Approach 1:
The patent forms the ordered periodic array of core-shell particles on a substrate before applying the matrix composition. This preliminary arrangement of particles creates the Bragg diffraction structure in advance, allowing the matrix to simply be applied and cured without requiring complex post-processing to achieve the ordered array, thereby reducing manufacturing complexity while maintaining precision
Solution Approach 2:
The patent controls the wavelength and intensity of diffracted radiation by adjusting parameters such as particle spacing, shell thickness, and refractive index contrast, rather than requiring complex manufacturing processes. By optimizing these parameters during particle formation, the desired Bragg diffraction characteristics are achieved with simpler manufacturing steps
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 durable goniochromatic materials with minimal haze, capable of producing desired colored appearances by adjusting the spacing and refractive index difference between particles and the matrix, achieving controlled Bragg diffraction and interference effects.
Implementation Method 1
an ordered periodic array of particles held in a polymeric matrix wherein said particles each comprise a core surrounded by a shell... arranged to diffract radiation... achieving controlled Bragg diffraction
Implementation Method 2
swelling the shells by diffusing components of the matrix into the shells... creating a refractive index gradient
Implementation Method 3
Their optical effect results from the directional reflection of light from predominantly sheet-like particles... achieving controlled Bragg diffraction and interference effects
Data Source
AI summary
A radiation diffraction material comprising an ordered periodic array of particles held in a polymeric matrix is disclosed; the particles each comprise a core surrounded by a shell of a non-film forming composition that is different from the matrix. Methods for using the material are also disclosed.