Alpha-Substituted Phthalocyanine Dyes for Antimicrobial Facemasks
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Solution Overview
Problem
Existing facemasks lack effective and efficient antimicrobial properties against infective agents due to issues with singlet oxygen generators, such as solubility, aggregation, and stability, and there is a need for materials that can safely and continuously generate singlet oxygen for facemask applications.
Innovation Solution
The use of cationic phthalocyanine dyes, substituted at the alpha position, which are applied to facemask materials like polypropylene, polyester, or cellulose, to generate singlet oxygen, providing continuous antimicrobial protection without significant reduction in physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commonly used singlet oxygen generators are applied to facemask materials, then antimicrobial activity is achieved, but solubility and stability issues arise leading to aggregation and reduced effectiveness
Solution Approach 1:
The patent modifies the chemical parameters of the phthalocyanine dye by introducing specific substituents (such as sulfonate groups) to enhance water solubility and prevent aggregation. This chemical parameter change allows the dye to maintain stable dispersion in the fabric treatment process while preserving singlet oxygen generation capability for antimicrobial activity
Solution Approach 2:
The patent creates a composite system by integrating the modified phthalocyanine dye with facemask fabric materials (polypropylene, polyester, or cellulose). This composite approach ensures the dye remains stably associated with the fabric while maintaining its antimicrobial function through controlled singlet oxygen release
2Object-affected harmful factors
If singlet oxygen generators are incorporated into facemasks to kill infective agents, then antimicrobial protection is provided, but the generators may aggregate and reduce filtration efficiency
Solution Approach 1:
The patent applies the antimicrobial dye treatment selectively to specific regions or layers of the facemask structure, particularly targeting areas where microbial contamination is most likely. This localized application ensures antimicrobial protection where needed while preserving the overall filtration structure and preventing aggregation-related defects in critical filtration zones
3Object-affected harmful factors
If metal-free dyes are used to avoid toxicity, then safety is improved, but singlet oxygen generating efficiency and antimicrobial activity are reduced
Solution Approach 1:
The patent optimizes the molecular parameters of the metal-free phthalocyanine dye by adjusting substituent positions (alpha vs beta substitution) and types to maximize singlet oxygen quantum yield. This parameter optimization achieves high antimicrobial efficiency without requiring metal centers, maintaining user safety while improving power output
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 alpha-substituted phthalocyanine dyes effectively generate singlet oxygen, offering high antimicrobial activity with a short half-life, reducing the risk of microbial resistance and maintaining material integrity.
Implementation Method 1
The present invention provides an antimicrobial facemask comprising a singlet oxygen generating photosensitising dye
Data Source
AI summary
A printing process for printing with ink an image on a glove formed by a dipping process, wherein the image is first printed on a former and transferred to the glove during dipping.