Nanoparticle-Modified Filter Media for Liquid Filtration
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Solution Overview
Problem
Existing liquid filtration technologies face challenges in maintaining high flow rates while achieving efficient contaminant capture, particularly with smaller pore sizes leading to clogging and reduced particle holding capacity.
Innovation Solution
The development of filter media comprising a substrate with fibers and nanoparticles dispersed throughout, where at least some nanoparticles are bonded to the fibers, enhancing the filter's efficiency and maintaining flow rates by reducing mean flow pore size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If smaller pore sizes are used to increase contaminant capture efficiency, then filtration efficiency is improved, but flow rate decreases
Solution Approach 1:
The patent applies local quality by creating zones of different nanoparticle concentrations within the filter medium. The nanoparticle distribution is non-uniform, with higher concentrations in specific regions to enhance contaminant capture while maintaining larger pore pathways in other areas to preserve flow rate. This spatial variation in filtration properties resolves the contradiction between efficiency and productivity.
Solution Approach 2:
The patent uses composite materials by combining traditional fibrous filter medium with dispersed nanoparticles. This composite structure creates a multi-scale filtration system where the fibrous matrix provides structural support and macro-pore pathways for flow, while the nanoparticles provide fine-pore filtration for contaminant capture. The synergistic combination maintains flow rate while enhancing efficiency.
2Measurement precision
If smaller pore sizes are used to increase contaminant capture efficiency, then filtration efficiency is improved, but pore volume decreases leading to reduced particle holding capacity
Solution Approach 1:
The patent creates local zones with high nanoparticle concentration for efficient contaminant capture, while maintaining overall pore volume through the fibrous matrix structure. Different regions of the filter medium serve different functions: nanoparticle-rich zones for filtration efficiency and fibrous zones for particle holding capacity.
Solution Approach 2:
The patent implements a nested structure where nanoparticles are distributed within and between the fibrous matrix elements. The nanoparticles are embedded in the pores of the fibrous structure, creating a hierarchical pore system. This nesting allows the filter to maintain the pore volume of the fibrous matrix while adding the fine-filtration capability of nanoparticles, thereby preserving both efficiency and particle holding capacity.
3Measurement precision
If smaller pore sizes are used to increase contaminant capture efficiency, then filtration efficiency is improved, but resistance to flow increases
Solution Approach 1:
The patent reduces overall flow resistance by localizing the nanoparticle filtration function to specific zones rather than uniformly distributing nanoparticles throughout the entire filter medium. This creates a gradient or segmented structure where only certain regions provide fine-filtration resistance, while other regions maintain lower resistance pathways for bulk flow.
Solution Approach 2:
The composite structure of fibrous matrix with dispersed nanoparticles creates a dual-function material where the fibrous component maintains structural integrity and provides low-resistance flow pathways, while the nanoparticle component provides high-efficiency filtration at localized sites. This composite approach prevents the uniform high resistance that would result from uniformly small pore sizes.
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 solution effectively increases contaminant capture efficiency while maintaining or improving liquid flow rates, extending the filter's service life and reducing the need for frequent replacements.
Implementation Method 1
nanoparticles dispersed throughout at least a portion of the filter media. At least some of the nanoparticles are bonded to at least some of the fibers in the substrate
Implementation Method 2
Liquid filtration is the process of removing solid particles, impurities, and contaminants that are suspended in a fluid stream. It generally involves the flow of the process liquid (in the form of slurries and suspensions) through a permeable filter medium and the blocking and retention of the captured solids
Data Source
AI summary
Filter media for use in liquid filters and liquid filters are provided that include a substrate, such as a porous membrane, and nanoparticles incorporated into the substrate. The nanoparticles may comprise nanoparticles, nanofibers or mini fibers that have at least one dimension less than about 20 microns. The nanoparticles are bonded to the fibers within the substrate and are dispersed “in depth” within the substrate, which improves the performance characteristics of the material for a number of different applications. For example, the nanoparticles increase the overall surface area within the substrate, which may increase its filtration efficiency and allow for the capture of submicron contaminants without significantly compromising other factors, such as bubble point or through-put across the filter.