Photonic Crystal Microsphere Structural Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Photonic crystal microspheres used as color pigments face challenges in maintaining mechanical strength during manufacturing processes, leading to structural damage and loss of desired color effects due to inadequate binding of secondary particles within the microsphere structure.
Innovation Solution
A photonic crystal microsphere comprising mono-dispersed polymer particles with a co-assembly material in the interstition, formed through a method involving a liquid solution with the co-assembly material or its precursor, and removing the liquid medium via spray drying or microfluidic methods, resulting in enhanced structural strength and consistent color across the visible spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If secondary smaller particles are added as binding agents to increase mechanical strength, then structure strength is improved, but poor dispersion of secondary particles may worsen structure strength and create voids
Solution Approach 1:
The patent employs a binderless approach where the photonic crystal microsphere structure is designed to be self-sufficient without requiring secondary binding particles. The closely-packed mono-dispersed particles themselves form the structural framework, eliminating the need for additional binding agents that would require dispersion optimization and could create voids.
Solution Approach 2:
The patent creates a composite structure by combining mono-dispersed particles of different materials (e.g., silica particles with polymer particles) to form the photonic crystal microsphere. This composite approach provides inherent structural strength through the interaction between different particle materials without requiring separate binding agents.
2Ease of manufacture
If mono-dispersed particles are assembled in closely-packed structure to form photonic crystal microsphere, then color effects are achieved, but mechanical strength is insufficient and structure is easily damaged
Solution Approach 1:
The patent employs composite materials by combining mono-dispersed particles of different materials (e.g., silica particles with polymer particles) to form the photonic crystal microsphere. This composite approach provides inherent structural strength through the interaction between different particle materials without requiring separate binding agents.
Solution Approach 2:
The patent optimizes parameters such as particle size distribution, particle concentration, and material composition of the mono-dispersed particles to achieve both the desired photonic crystal color effects and sufficient mechanical strength. By carefully controlling these parameters, the structure becomes inherently stable without requiring additional binding agents.
3Strength
If secondary particles are used to bind microsphere structure, then mechanical strength is enhanced, but dispersion ability and void minimization are not sufficiently considered
Solution Approach 1:
The patent employs a binderless approach where the photonic crystal microsphere structure is designed to be self-sufficient without requiring secondary binding particles. The closely-packed mono-dispersed particles themselves form the structural framework, eliminating the need for additional binding agents that would require dispersion optimization and could create voids.
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 a photonic crystal microsphere with improved mechanical strength and color fidelity, maintaining a pure color effect without angle-dependency, suitable for various products including paints, inks, and plastics, by using mono-dispersed polymer particles and a co-assembly material to create a robust and uniform structure.
Implementation Method 1
a plurality of mono-dispersed particles is assembled in a closely-packed and regularly-ordered structure to form one photonic crystal microsphere. This highly organized structure, with the size of the mono-dispersed particles in the range of wavelength of visible light, selectively diffracts certain wavelengths and therefore renders a color corresponding to the diffracted wavelengths.
Implementation Method 2
removing the liquid medium from the dispersion, preferably by spray drying, microfluidic method, or inkjet printing, thereby forming the photonic crystal microsphere
Data Source
AI summary
A photonic crystal microsphere, comprising: a plurality of mono-dispersed polymer particles in a closely-packed and regularly-ordered structure, with interstition therebetween, forming the photonic crystal microsphere; and a co-assembly material contained in the interstition. The photonic crystal microsphere provides a structure of enhanced strength and a good color effect.