Cationic Polymer Fibrous Web for Microorganism Capture
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Solution Overview
Problem
Current methods for removing microorganisms like bacteria from surfaces and liquids often rely on harsh chemicals, which can be harmful and lead to increased bacterial resistance, and may damage surfaces or contaminate environments.
Innovation Solution
A fibrous web containing a cationic polymer with a molar ratio of cationic to hydrophobic monomers greater than 1:1, which attracts and retains negatively charged bacteria through electrostatic interactions without the need for chemicals, enhancing capture and retention capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical solutions (detergents, biocides, antibiotics) are used to kill or remove microorganisms, then microorganism removal effectiveness is improved, but harmful effects increase (chemical exposure harm, surface corrosion, bacterial resistance)
Solution Approach 1:
The patent replaces chemical-based microorganism removal mechanisms with a physical electrostatic interaction mechanism. The cationic polymer uses electrostatic attraction between positive charges on the polymer and negative charges on bacterial cell walls to capture and retain microorganisms, eliminating the need for harmful chemicals while maintaining removal effectiveness
Solution Approach 2:
The cationic polymer acts as an intermediary substance that mediates between the fibrous web and bacteria. It is applied to the web and provides electrostatic capture capability without requiring the web itself to be chemically active or harmful, thus protecting surfaces and environments from chemical exposure
2Reliability
If metal cation solutions are applied to the web surface to capture negatively charged bacteria, then bacterial capture capability is improved, but contamination risk increases (metal cation leaching)
Solution Approach 1:
The patent changes the chemical composition parameters by using a cationic polymer with specific monomer ratios (cationic monomer to hydrophobic monomer greater than 1:1) instead of metal cations. This parameter change maintains the electrostatic capture function while eliminating metal leaching contamination, as the polymer's positive charges are fixed in the polymer structure rather than being free metal ions
Solution Approach 2:
The invention uses a composite material system consisting of a cationic polymer comprising both cationic monomers and hydrophobic monomers. This composite structure provides electrostatic capture capability through the cationic groups while the hydrophobic groups contribute to polymer stability and prevent leaching, combining multiple functional properties in a single material
3Reliability
If cationic polymer with both cationic and hydrophobic monomers is used, then bacterial capture and retention is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the molar ratio parameter of cationic to hydrophobic monomers to be greater than 1:1, which enhances bacterial capture efficiency. This parameter optimization balances performance improvement with reasonable manufacturing complexity, as standard copolymerization techniques can achieve the desired ratio without requiring complex multi-step synthesis procedures
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 cationic polymer effectively captures and retains bacteria, preventing their spread and infection without using antimicrobials, while remaining immobilized within the fibrous web, thus addressing the limitations of chemical-based methods.
Implementation Method 1
The cationic polymer has an affinity for the negatively charged cell walls of bacteria
Data Source
AI summary
A fibrous web that includes a cationic polymer that contains a cationic monomer comprising a cationic functional group having an affinity for the negatively charged cell walls of bacteria and a hydrophobic monomer comprising a hydrophobic functional group is provided. The molar ratio of the cationic monomer to the hydrophobic monomer is greater than about 1:1. The affinity of the cationic polymer for the bacteria allows the web to capture bacteria, thereby removing them from a surface or liquid, without the use of harsh chemicals, and also inhibiting their spread to other surfaces and liquids that may contact the web.