Transparent Photocatalytic Mask Filter for Airflow and Pathogen Control
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Solution Overview
Problem
Existing disposable masks are inadequate in protecting against bacteria and viruses due to large pore sizes, restrict airflow, and do not address contamination issues, particularly for individuals with breathing difficulties and those who rely on lip reading.
Innovation Solution
A disposable mask with a fiberglass filter functionalized with low iron oxide, iron-doped titanium dioxide nanoparticles that kills airborne microbes on contact and traps them, while maintaining minimal airflow restriction, and is optically transparent to allow lip reading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If disposable masks use larger pore sizes (e.g., N95 with 0.3 microns), then airflow is improved, but protection against small bacteria and viruses is insufficient
Solution Approach 1:
The mask is divided into multiple functional layers: an outer layer for pathogen capture, a middle layer with photocatalytic properties for pathogen killing, and an inner layer for comfort and breathability. This segmentation allows each layer to specialize in one function, achieving both high protection and good airflow.
Solution Approach 2:
The photocatalytic layer acts as an intermediary between the pathogen-capturing outer layer and the breathable inner layer. It converts light energy into chemical energy to destroy pathogens, mediating the conflict between trapping pathogens and maintaining airflow.
2Reliability
If disposable masks use smaller pore sizes to capture more pathogens, then protection is improved, but airflow restriction increases
Solution Approach 1:
The patent replaces the purely mechanical filtration system (relying on physical pore size) with a photochemical system. The photocatalytic layer uses light energy to generate reactive oxygen species that destroy pathogens, substituting mechanical filtration with a chemical-biological mechanism that doesn't require small pores.
Solution Approach 2:
The patent changes the operational parameter from passive physical filtration to active photochemical destruction. By introducing light as an energy parameter, the system achieves pathogen elimination without requiring restrictive pore sizes, fundamentally changing how protection is achieved.
3Reliability
If disposable masks are used to protect against pathogens, then protection is provided, but mask contamination creates infection risk
Solution Approach 1:
The patent converts the harmful accumulation of pathogens on the mask into a beneficial process by incorporating photocatalytic materials that actively kill pathogens. The mask surface, which would normally become contaminated, instead becomes a reactive surface that destroys pathogens upon contact with light.
Solution Approach 2:
The mask performs self-disinfection through its photocatalytic layer. When exposed to light, the mask automatically generates reactive oxygen species that destroy pathogens on its surface, providing self-service pathogen elimination without requiring external intervention or frequent replacement.
4Reliability
If traditional masks are used to protect against pathogens, then protection is provided, but facial expressions and lip reading become difficult
Solution Approach 1:
The patent incorporates optically transparent or translucent materials that allow light to pass through, enabling facial expressions and lip movements to be visible. This optical property change maintains social communication while providing pathogen protection.
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 mask effectively kills and traps a substantial percentage of airborne microbes, minimally affects airflow, and allows for clear facial expressions, providing enhanced protection and usability for individuals with breathing issues and those who rely on lip reading.
Implementation Method 1
a porous glass filter which is functionalized with a visible light photo-catalyst... The visible light photo-catalyst is low iron oxide, iron-doped titanium dioxide nanoparticle
Data Source
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AI summary
A disposable mask or optically transparent mask comprising a mask body is provided. The disposable mask includes a periphery, and straps attached to the mask body proximate the periphery for releasably retaining the mask on a user's face, the mask body including: an inner layer, which is a polymeric plastic material with a plurality of passageways therethrough, and which has an inner surface and an outer surface; and a porous glass filter which is functionalized with a visible light photocatalyst and abuts the outer surface of the inner layer. Apparel comprising fiberglass which is functionalized with a visible light photocatalyst is also provided.