Tunable Nanofiber Filter Media with Self-Supporting Laminae
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Solution Overview
Problem
Existing fibrous filter media face challenges such as the need for supporting substrates, risk of delamination, rapid particle loading, and alignment issues, along with limitations in producing fine fibers with high surface-to-volume ratios, which affect filtration efficiency and effectiveness.
Innovation Solution
The development of tunable nanofiber filter media and devices that utilize layered laminas with user-defined arrays of nanofibers and nanoholes to create specific nanoscale topographies for filtering, allowing for improved filtration by optimizing fiber spacing, diameter, and surface area density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional fibrous filter media are used with supporting substrates and fine fiber layers, then filtration efficiency for small particles is improved, but the risk of delamination and rapid particle loading increases
Solution Approach 1:
The invention extracts and eliminates the supporting substrate from the filter media structure. The nanofiber layer is made self-supporting through controlled deposition and consolidation processes, removing the substrate that causes delamination issues while maintaining the fine fiber structure needed for high filtration efficiency
Solution Approach 2:
The invention applies preliminary consolidation treatment to the nanofiber layer during the deposition process. This preliminary action creates a mechanically robust structure that prevents subsequent delamination and reduces rapid particle loading by establishing proper fiber packing and interconnectivity before the filter is put into service
2Measurement precision
If fine fibers with high surface-to-volume ratio are produced to improve filtration efficiency, then the ability to trap contaminants is enhanced, but processing limitations and production complexity increase
Solution Approach 1:
The invention replaces complex mechanical fiber processing systems with a controlled deposition approach. Instead of using traditional mechanical methods to create and handle ultra-fine fibers, the system deposits nanofibers in a controlled manner from a precursor material, simplifying the manufacturing process while achieving the desired high surface-to-volume ratio
Solution Approach 2:
The invention changes the production parameters by controlling fiber diameter, spacing, and deposition density through process variables rather than complex mechanical processing. This allows optimization of the surface-to-volume ratio for high filtration efficiency while keeping the manufacturing process manageable through parameter control
3Measurement precision
If nanofibers are produced by electrospinning to achieve high surface-to-volume ratio, then filtration performance is improved, but high-voltage equipment and processing complexity are required
Solution Approach 1:
The invention extracts and removes the high-voltage electrospinning equipment from the nanofiber production process. By using alternative deposition methods that do not require kilovolt electric fields, the system simplifies the equipment requirements while still producing nanofibers with the necessary surface-to-volume ratio for high filtration performance
Solution Approach 2:
The invention employs a deposition approach that uses simpler, more readily available equipment rather than complex electrospinning apparatus. The process uses conventional, easily obtainable materials and equipment that can be implemented without specialized high-voltage infrastructure
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
This approach enhances filtration efficiency by reducing pressure drop, increasing cleanability, and preventing clogging, while enabling the separation of contaminants at the nanoscale, improving the overall performance of filter media and devices.
Implementation Method 1
On the molecular level, fibrous materials also trap contaminants with electrostatic forces, including ionic bonding, hydrogen bonding, and Van der Waals forces
Implementation Method 2
On the molecular level, fibrous materials also trap contaminants with electrostatic forces, including ionic bonding, hydrogen bonding, and Van der Waals forces
Implementation Method 3
On the molecular level, fibrous materials also trap contaminants with electrostatic forces, including ionic bonding, hydrogen bonding, and Van der Waals forces
Implementation Method 4
On the molecular level, fibrous materials also trap contaminants with electrostatic forces, including ionic bonding, hydrogen bonding, and Van der Waals forces
Data Source
AI summary
A tunable nanofiber filter device can include a filter housing defining an interior space, the housing having defined therein and inlet and an outlet, each in fluid communication with the interior space, and a plurality of filter laminas disposed within the interior space, each filter lamina including an upper surface, a lower surface, and an aperture defined therethrough. The plurality of filter laminas can be arranged in a stack wherein the opposing surfaces of adjacent filter laminas define a portion of an interlaminar flow space extending between the opposing surfaces. The flow space can be in fluid communication with the apertures of corresponding adjacent filter laminas to form a continuous flow passage extending through the lamina stack from the inlet to the outlet. An array nanofibers can extend into the flow passage from a portion of each filter lamina such that a fluid flowed through the flow passage flows across a portion of said array.