Electrospun Nanofiber Mask Coating for Filtration and Antibacterial Action
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Solution Overview
Problem
Conventional protective masks, such as surgical/medical masks and N95 respirators, face challenges in effectively filtering out particles of various sizes, particularly those around the most penetrating particle size (MPPS) of 0.3 µm, and often compromise on breathability and comfort due to their design, with many not possessing antibacterial functions to kill viruses and bacteria on contact.
Innovation Solution
A protective mask featuring an ultrafine fibrous coating composed of electrospun partially gelled submicron fibers interweaved with nanofibers, combined with a biocide encapsulated or surface-attached to the fibers, which enhances filtration efficiency and breathability while providing antibacterial properties by electrostatic attraction and chemical linkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional filtering barriers are used in protective masks, then the mask structure is simple and easy to manufacture, but the filtration efficiency for particles around 0.3 μm is relatively ineffective
Solution Approach 1:
The patent applies composite materials by combining electrospun submicron fibers (300-999 nm diameter) with nanofibers (10-99 nm diameter) to form a multi-scale fibrous coating. This composite structure creates a hierarchical filtration system where different fiber size ranges work synergistically to trap particles across the entire size spectrum, particularly improving capture of the most penetrating particle size (MPPS) around 0.3 μm while maintaining manufacturability through electrospinning technology.
Solution Approach 2:
The patent implements local quality by creating regions with different fiber diameters within the same coating layer. The electrospun coating contains both submicron fibers and nanofibers distributed throughout, providing localized areas of high filtration efficiency for different particle sizes. This heterogeneous fiber structure allows the mask to address multiple filtration challenges simultaneously without requiring completely separate filtering layers.
2Manufacturing precision
If high filtration efficiency is achieved through dense filtering barriers, then particle capture improves, but breathability and comfort are compromised
Solution Approach 1:
The patent utilizes porous materials by employing an electrospun fibrous coating with controlled porosity. The random arrangement of submicron and nanofibers creates a three-dimensional porous network that allows air molecules to pass through via diffusion and convection while still effectively trapping particles. The pore size distribution in this porous structure is optimized to maintain breathability while ensuring high filtration efficiency for respirable particles.
Solution Approach 2:
The patent applies parameter changes by controlling the diameter distribution of electrospun fibers during manufacturing. By producing a blend of submicron fibers (300-999 nm) and nanofibers (10-99 nm) with specific diameter ranges and proportions, the coating achieves optimal balance between filtration efficiency and breathability. The fiber diameter parameters are carefully selected to create appropriate pore sizes that allow air flow while capturing particles effectively.
3Manufacturing precision
If conventional protective masks are designed without biocides, then the mask structure remains simple, but the ability to kill bacteria and viruses on contact is lost
Solution Approach 1:
The patent employs an intermediary approach by incorporating biocidal agents into the electrospun fibrous coating matrix. The biocides are embedded within or on the surface of the submicron and nanofibers, allowing them to interact with and inactivate microorganisms that contact the mask surface. This intermediary layer of biocide-containing fibers provides active antimicrobial protection while maintaining the overall mask structure and filtration function.
Solution Approach 2:
The patent implements multi-functionality by designing the electrospun fibrous coating to simultaneously perform multiple functions: (1) physical filtration of particles through the fibrous network, (2) electrostatic attraction of charged particles, and (3) antimicrobial inactivation through incorporated biocides. This multi-functional coating eliminates the need for separate antimicrobial treatments or additional layers, integrating multiple protective capabilities into a single component.
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 achieves N95-level filtration efficiency with improved breathability and enhanced antibacterial capabilities, effectively trapping and killing microorganisms, thus providing superior protection against airborne pathogens.
Implementation Method 1
electrospun partially gelled submicron fibers which are interweaved with nanofibers in order to form said protective masks
Implementation Method 2
a biocide which is encapsulated into, surface-attached onto, blended with, physically trapped, and/or chemically linked to said submicron fibers and nanofibers
Implementation Method 3
free-surface electrospinning said formulation into said coating consisting of interweaving said partially gelled submicron fibers with said nanofibers
Data Source
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AI summary
A protective mask comprises an ultrafine fibrous coating comprising partially gelled submicron fibers interweaved with nanofibers and a biocide encapsulated in, surface-attached onto, blended with, physically trapped, and/or chemically linked to said submicron fibers and nanofibers. In an example, a microfibrous substrate with the coating assembles with other microfibrous substrates to form a protective mask having N95 level of protection and bacteria-killing capability.