Nanoparticle Light-Filtering Hydrogel for Stable Green Blocking
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Solution Overview
Problem
Existing methods for integrating light-blocking materials into soft biomaterials, such as contact lenses, lack the ability to selectively block specific wavelengths, withstand long-term storage and autoclaving, and provide tunable light filtering without altering the material's properties.
Innovation Solution
A composition comprising gold nanoparticles with a peak light absorption between 500 nm to 600 nm, anchored by a methacryloyl-derived monomer, and coated with poly(vinyl alcohol) in a hydrogel matrix, allowing for customizable light filtering through controlled nanoparticle morphology and anchoring mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nanoparticles are dispersed in polymer matrix without anchoring mechanism, then light filtering function is achieved, but nanoparticle stability and retention during long-term storage and autoclaving deteriorates
Solution Approach 1:
The patent applies preliminary action by incorporating anchoring mechanisms (such as covalent bonding groups or physical entanglement structures) into the polymer matrix before nanoparticle dispersion. This pre-established anchoring system ensures nanoparticles remain stable during subsequent processing steps including autoclaving and long-term storage, preventing aggregation or leaching that would otherwise occur.
Solution Approach 2:
The patent creates a composite material system where nanoparticles are chemically or physically integrated with the polymer matrix through anchoring mechanisms. This composite structure combines the light-filtering properties of nanoparticles with the structural stability of the polymer, ensuring both functional performance and long-term durability under various storage and sterilization conditions.
2Adaptability or versatility
If conventional light filtering materials are used, then light blocking is achieved, but selective wavelength control and tunability deteriorates
Solution Approach 1:
The patent applies local quality by incorporating light-filtering nanoparticles with specific size distributions, shapes, and material compositions tailored to absorb or scatter particular wavelengths. By controlling the local optical properties of different nanoparticle populations within the matrix, the material achieves selective wavelength filtering while maintaining overall structural uniformity.
Solution Approach 2:
The patent utilizes parameter changes by adjusting nanoparticle characteristics (size, shape, composition, concentration) to tune the optical filtering properties. For example, varying gold nanoparticle size from 20nm to 80nm shifts the plasmon resonance peak across different wavelengths, enabling precise control over which wavelengths are blocked while maintaining manufacturing feasibility.
3Reliability
If light filtering materials are integrated into soft biomaterials, then optical function is achieved, but material properties and biocompatibility deteriorate
Solution Approach 1:
The patent creates a composite material where light-filtering nanoparticles are integrated into a biocompatible polymer matrix through anchoring mechanisms. This composite structure maintains the soft, flexible properties of the base biomaterial while incorporating optical filtering functionality, ensuring both material integrity and biocompatibility are preserved.
Solution Approach 2:
The patent applies local quality by concentrating light-filtering nanoparticles in specific regions or at controlled concentrations within the biomaterial matrix. This localized integration ensures optical functionality is achieved without excessive nanoparticle loading that could compromise material flexibility, biocompatibility, or structural integrity.
4Ease of manufacture
If nanoparticles are added after curing, then processing is simplified, but nanoparticle distribution uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by incorporating nanoparticles into the polymer matrix during the uncured state, before the material sets. This timing allows nanoparticles to disperse uniformly throughout the matrix while the polymer is still mobile, achieving homogeneous distribution. The anchoring mechanisms are also established at this stage, ensuring nanoparticles become locked in place before any aggregation can occur during curing.
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
Enables long-term stability and selective light blocking in the green region, improving color perception for colorblind individuals by enhancing the resolution between red and green cones, while maintaining material integrity and biocompatibility.
Implementation Method 1
a plurality of gold nanoparticles dispersed in the base material, where the plurality of gold nanoparticles exhibit a peak light absorption value in the range of about 500 nm to about 600 nm
Data Source
AI summary
A composition for light filtering, the composition comprising: a base material comprising a HEMA-based material; a plurality of metal nanoparticles dispersed in the base material, wherein the plurality of metal nanoparticles exhibit a peak light absorption value in the range of about 500 nm to about 600 nm; an anchoring mechanism dispersed in the base material, the anchoring mechanism comprising methacryloyl-derived monomer; and a nanoparticle coating material disposed on at least a portion of the plurality of metal nanoparticles.