Fluorescent Indicator for Antimicrobial Coating Detection
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Solution Overview
Problem
Existing antimicrobial surface coatings degrade over time and wear away, making it difficult to detect their presence or absence without damaging the surface and requiring complex procedures, especially in high-contact areas like aircraft interiors.
Innovation Solution
A method using a detectable fluorescent indicator that bonds with quaternary ammonium compounds in antimicrobial coatings, allowing for non-destructive detection under UV light, enabling the identification of coating presence or absence and facilitating reapplication as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visible dyes are bonded to antimicrobial surface coatings for detection, then the presence of coating can be detected via visual inspection, but the surface becomes permanently stained and the detection sensitivity is limited
Solution Approach 1:
The patent employs fluorescent dyes that exhibit color changes under UV illumination rather than visible light. The fluorescent indicator remains invisible under normal lighting conditions but emits visible fluorescence when excited by UV light, enabling detection without permanent visual staining of the surface under normal conditions.
Solution Approach 2:
The patent replaces the mechanical/visual inspection method (visible dye bonding) with an optical detection method using fluorescence. Instead of relying on absorbance of visible light, the system uses fluorescence emission under UV excitation, which provides higher sensitivity and does not permanently alter the surface appearance under normal lighting.
2Reliability
If antimicrobial surface coatings are applied to high-contact surfaces, then microbe transfer is reduced, but the coatings degrade and wear away over time requiring frequent checking and reapplication
Solution Approach 1:
The patent incorporates fluorescent indicators into the antimicrobial coating formulation, creating a self-monitoring system. When UV light is applied during routine inspections, the fluorescent indicator provides immediate visual feedback about the coating's presence and integrity, enabling operators to determine whether reapplication is needed without complex testing procedures.
Solution Approach 2:
The fluorescent indicator is pre-incorporated into the antimicrobial coating during application, rather than added separately during inspection. This preliminary incorporation ensures the indicator is uniformly distributed throughout the coating layer from the start, providing continuous monitoring capability throughout the coating's service life.
3Measurement precision
If complex detection procedures are used to check coating presence, then accurate detection can be achieved, but the procedures are time-consuming and difficult to implement
Solution Approach 1:
The patent extracts the detection function from complex laboratory procedures and integrates it directly into the coating formulation itself. The fluorescent indicator is built into the coating, allowing detection to be performed with simple UV light exposure and visual observation, eliminating the need for complex extraction, preparation, or analysis procedures.
Solution Approach 2:
The fluorescent indicator serves multiple functions simultaneously: it provides detection capability, indicates coating uniformity, and can potentially quantify coating thickness. This multi-functionality is achieved through a single additive component rather than requiring separate detection systems or 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
Enables sensitive detection of even monolayer coatings without cosmetic damage, ensuring continuous antimicrobial protection and efficient reapplication, particularly in high-contact environments like aircraft cabins.
Implementation Method 1
exposing the substrate to UV light to excite the fluorescent indicator and observing the fluorescence
Implementation Method 2
a detectable, water-soluble fluorescent indicator and at least one quaternary ammonium compound or other static/non-leachable compound
Data Source
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AI summary
Disclosed are methods for detecting a presence or absence of an antimicrobial surface coating including applying (106) at least one detectable fluorophoric dye compound (302) to a substrate (300), irradiating (112) the surface of the substrate (300) with ultraviolet radiation (304) in the 100 nm - 415 nm wavelength range to excite the detectable fluorophoric dye compound (302), observing (114) fluorescence (306) of the excited fluorophoric dye compound (302), and determining (116) the presence or absence of the antimicrobial surface coating based on the observed fluorescence (306). Further disclosed are antimicrobial surface coating solutions, methods (200) for their application, and methods (100) for confirming the presence and coverage of antimicrobial surface coatings.