Functionalized Oxide-Coated Substrates for Breathable Virus Filtration
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Solution Overview
Problem
Conventional personal protective equipment (PPE) and air filters are inadequate in trapping viruses, particularly those transmitted through airborne routes, as they fail to balance breathability with effective virus filtration, and existing materials are often expensive, in short supply, or difficult to breathe through, especially for individuals with respiratory conditions.
Innovation Solution
Development of coated substrates incorporating mineral oxide and iron oxide particles, which are functionalized with organic groups, these substrates are integrated into fabrics and filters to create breathable materials that effectively trap viruses by collapsing aspirated droplets and immobilizing virus particles while maintaining low breathing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PPE and air filters are used to block viruses, then virus filtration is improved, but breathing resistance increases and breathability deteriorates
Solution Approach 1:
The patent employs porous substrates including woven and non-woven fabrics as the base structure for the coated substrate. These porous materials provide inherent breathability while serving as a framework for virus-trapping coatings, allowing air passage while capturing viral particles through the functionalized particle layers
Solution Approach 2:
The invention creates composite materials by coating porous substrates with functionalized mineral oxide and iron oxide particles. This composite structure combines the breathability of the porous substrate with the virus-trapping capabilities of the functionalized particle coating, achieving both low breathing resistance and high viral filtration efficiency
2Reliability
If N95 masks are used to trap viruses, then virus filtration is improved, but cost increases and availability decreases
Solution Approach 1:
The patent employs cost-effective substrates such as woven and non-woven fabrics that can be readily manufactured and disposed of after limited use. The functionalized particle coating provides sufficient virus-trapping capability for the duration of use, after which the entire coated substrate can be discarded, eliminating the need for expensive, complex N95 mask manufacturing while maintaining adequate protection
Solution Approach 2:
The invention modifies the functional properties of inexpensive mineral oxide and iron oxide particles through functionalization with organic groups, transforming them into effective virus-trapping materials. This parameter change (chemical functionalization) enables low-cost materials to achieve virus filtration performance comparable to expensive N95 masks
3Reliability
If HEPA filters are used to trap smaller particles, then particle filtration is improved, but transmission of airborne bacteria and viruses remains a problem
Solution Approach 1:
The patent introduces functionalized mineral oxide and iron oxide particles as intermediary trapping agents between the air flow and the porous substrate. These functionalized particles act as mediators that specifically capture viral and bacterial particles through their organic functional groups, preventing their transmission while allowing breathable air passage through the substrate
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 coated substrates demonstrate significant virus particle rejection (up to 75%) while maintaining breathability and reusability, outperforming conventional materials in viral filtration efficiency and cost-effectiveness, with the ability to be washed without losing functionality.
Implementation Method 1
The coated substrates include functionalized mineral oxide particles and functionalized iron oxide particles... the coated substrates demonstrate significant virus particle rejection (up to 75%) while maintaining breathability... the ability to be washed without losing functionality
Data Source
AI summary
Embodiments of the present disclosure generally relate to coated substrates having, e.g., anti-viral properties, to articles including the coated substrates, and to processes for making such coated substrates and articles. In an embodiment, a coated substrate is provided. The coated substrate includes a substrate having a weight of about 120 g/m2 or less according to ASTM D3776, mineral oxide particles, iron oxide particles, or both, coupled to at least a portion of the substrate wherein the coated substrate has a breathing resistance (95 L/min, EN 149:2001) of about 6 mbar or less.