N-Halamine Precursor Modified Surfaces for Regenerable Biocidal Coatings
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Solution Overview
Problem
Current methods for modifying surfaces with biocidal properties, such as those using silver or N-chloramine compounds, face challenges in scalability and safety due to complex processing steps and the use of environmentally unfriendly additives, and there is a need for more effective biocidal technologies to combat increasing antimicrobial resistance.
Innovation Solution
Development of modified surfaces incorporating cationic centers and N-halamine precursor groups, connected through various methods such as interpenetrating networks or click chemistry, to enhance biocidal activity and chlorine uptake, with a focus on optimizing the ratio of cationic centers to N-halamine precursor groups for improved biocidal efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver or N-chloramine compounds are used to modify surfaces for biocidal properties, then antimicrobial activity is achieved, but processing complexity and environmental safety deteriorate due to complex processing steps and environmentally unfriendly additives
Solution Approach 1:
The patent changes the chemical parameters by using N-halamine precursors that can be converted to active N-halamine biocidal groups through simple treatment with household bleach (sodium hypochlorite). This replaces complex industrial processing steps with a simple chemical transformation using readily available materials, reducing processing complexity while maintaining biocidal activity.
Solution Approach 2:
The patent employs readily available, inexpensive materials such as household bleach (sodium hypochlorite) to activate the biocidal properties of the modified surfaces. This replaces the need for expensive, specialized reagents and complex industrial processing equipment, making the method economically viable and environmentally friendly.
2Reliability
If silver is incorporated into textiles to provide antimicrobial properties, then broad-spectrum antimicrobial activity is achieved, but the amount of silver available is finite and decreases as textiles are laundered
Solution Approach 1:
The patent incorporates N-halamine precursors that can be regenerated by exposure to household bleach. After the biocidal activity decreases through laundering, the precursors can be reactivated in situ by simple treatment with bleach, allowing multiple regeneration cycles. This extends the service life of the antimicrobial treatment far beyond what is possible with silver, which cannot be regenerated once depleted.
Solution Approach 2:
The modified surfaces are designed to be regenerated using household bleach, a common household item. This allows the consumer to easily restore the antimicrobial properties at home without requiring specialized equipment or services, making the treatment self-maintaining and significantly extending its duration of action.
3Reliability
If complex processing methods are used to modify surfaces with biocidal properties, then antimicrobial efficacy is improved, but scalability and safety deteriorate
Solution Approach 1:
The patent simplifies the activation step by using household bleach (sodium hypochlorite) instead of complex industrial reagents. This chemical parameter change allows the same biocidal modification to be performed in both laboratory and industrial settings using readily available materials, greatly improving scalability while maintaining efficacy.
Solution Approach 2:
The patent uses N-halamine precursors as intermediary compounds that can be applied to surfaces through simple coating methods and then activated in place by exposure to bleach. This two-step process separates the application step (which can be scaled industrially) from the activation step (which provides the biocidal function), allowing for easy manufacturing scalability while maintaining high biocidal efficacy.
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 modified surfaces demonstrate enhanced biocidal activity and chlorine uptake, providing effective antimicrobial properties against a wide range of microorganisms, including resistant strains, with improved scalability and safety compared to existing methods.
Implementation Method 1
The modified surfaces demonstrate enhanced biocidal activity and chlorine uptake
Implementation Method 2
at least one compound that comprises an N-halamine precursor group... providing effective antimicrobial properties against a wide range of microorganisms
Data Source
AI summary
A modified surface with at least one cationic center and at least one compound. The surface can be modified by various methods. The result of these methods is that the cationic center and the compound are connected to the modified surface. The cationic center and the compound are connected to the modified surface so that both of the cationic center and the compound are available upon the modified surface to react with other chemicals or microorganisms that come into contact with or near to the modified surface. The availability of the cationic center and the compound cause the modified surface to have a functionality that it would not otherwise have. The number of molecules of the cationic center relative to the number of molecules of the at least one compound may influence the functionality of the modified surface.