Strain-Accommodating Photonic Crystal Materials
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Solution Overview
Problem
Conventional responsive photonic crystal materials face mechanical buckling and instability due to significant linear expansion or contraction, leading to structural instability and volume changes, which hinder effective color shifting and practical applications.
Innovation Solution
A strain-accommodating composite material is developed, featuring a segmented array of flexible polymers or hydrogels with photonic crystal lattices embedded within an elastic supporting polymer, maintaining constant size and volume during chromatic shifting, utilizing ferromagnetic particles and optimized crosslinking processes to achieve reversible and stable color changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If photonic crystal materials undergo significant linear expansion or contraction to achieve color shifting, then chromatic response is improved, but mechanical stability and structural integrity deteriorate
Solution Approach 1:
The photonic crystal structure is divided into multiple unit cells arranged in a periodic lattice. Each unit cell contains photonic crystal elements that can independently undergo volume changes during color transitions, while the overall segmented structure prevents buckling and maintains mechanical stability of the entire material
Solution Approach 2:
The patent creates a composite material system combining photonic crystal elements with a supporting matrix structure. The composite design allows the photonic crystal components to expand/contract for color changing while the matrix provides mechanical reinforcement, resolving the contradiction between chromatic response and structural integrity
2Ease of manufacture
If photonic crystal lattices expand and shrink to change color, then color shifting capability is improved, but volume stability and size consistency deteriorate
Solution Approach 1:
The patent implements local volume changes within individual unit cells while maintaining global volume stability. Each local region undergoes expansion or contraction to achieve chromatic shifting, but the periodic arrangement and supporting structure ensure the overall material maintains constant volume and dimensions
Solution Approach 2:
The patent transitions from considering only linear dimensional changes to accounting for volumetric changes in three dimensions. By designing the photonic crystal lattice to undergo coordinated expansion/contraction in multiple dimensions, the material achieves color shifting through volume changes while maintaining overall size consistency through compensatory mechanisms
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 material exhibits excellent mechanical properties, including high stretchability and strength, with reversible heat- or light-triggered color changes, maintaining constant size during chromatic shifts, suitable for applications like camouflage and anti-counterfeiting.
Implementation Method 1
photonic crystal lattices embedded therein providing a layer of photonic crystals, wherein the segmented array of flexible polymers are themselves embedded within an elastic supporting polymer that maintains a near constant size during chromatic shifting of the photonic crystal lattices
Implementation Method 2
the photonic crystal lattices contain ferromagnetic particles. In certain embodiments, the ferromagnetic particles have an iron oxide core
Data Source
AI summary
This disclosure relates to non-naturally occurring light reflecting or color changing materials comprising a segmented array of flexible polymers, wherein the segmented array of flexible polymers comprise photonic crystal lattices embedded therein, wherein the segmented array of flexible polymers are themselves embedded within an elastic supporting polymer that maintains a near constant size during chromatic shifting of the photonic crystal lattices.