UV-Stabilised Colourimetric Indicator for Delayed Colour Change
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing UV colourimetric indicators suffer from colour fading and lack stability over time, and increasing the amount of proton scavenger reduces the intensity of colour change, affecting visible contrast.
Innovation Solution
Incorporating a UV stabiliser into the indicator composition improves stability and allows for a delayed colour change, enabling higher maximum UV dose before colour change and increased intensity of colour contrast by reducing the proton-scavenging agent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a proton-scavenging agent is added to delay colour change, then the stability of the indicator is improved, but the intensity of colour change is reduced
Solution Approach 1:
A UV stabiliser is introduced as an intermediary substance that selectively absorbs UV radiation and prevents it from degrading the pH indicator. This mediator allows the proton-scavenging agent to remain at lower concentrations (maintaining colour intensity) while still providing the necessary delay function, as the UV stabiliser handles the UV protection role separately.
Solution Approach 2:
The invention changes the chemical composition parameters by adding a UV stabiliser component, which alters the overall system's interaction with UV radiation. This parameter change allows the proton-scavenging agent concentration to be optimized for colour intensity rather than being constrained by the need to provide both delay and UV protection functions.
2Duration of action of stationary object
If the amount of proton scavenger is increased to enhance delay effect, then the stability is improved, but the visible contrast is adversely affected
Solution Approach 1:
The invention segments the functional responsibilities by separating the delay function (performed by the proton-scavenging agent) from the UV protection function (performed by the UV stabiliser). This segmentation allows each component to be optimized independently, enabling sufficient delay effect with minimal proton-scavenging agent while maintaining colour contrast intensity.
Solution Approach 2:
The UV stabiliser acts as an intermediary that absorbs UV radiation before it can affect the pH indicator, thereby reducing the need for large amounts of proton-scavenging agent. This intermediary protects the indicator system while allowing the proton-scavenging agent to work at optimal low concentrations for maintaining colour intensity.
3Stability of the object's composition
If a UV stabiliser is added to improve colour stability, then the stability is enhanced, but the device complexity increases
Solution Approach 1:
The UV stabiliser serves multiple functions simultaneously: it protects the pH indicator from UV degradation, allows reduction of proton-scavenging agent concentration, maintains colour intensity, and preserves visible contrast. This multi-functionality justifies the addition of one more component by providing several benefits at once.
Solution Approach 2:
The invention creates a composite indicator system combining pH indicator, proton-scavenging agent, and UV stabiliser. This composite formulation achieves superior overall performance (enhanced stability, maintained intensity, improved contrast) that cannot be obtained with simpler single-component or two-component systems.
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 UV stabiliser enhances the stability and intensity of the colour change, allowing for a higher UV dose before colour change and improved visible contrast.
Implementation Method 1
a UV stabiliser... which enhances the stability and intensity of the colour change
Implementation Method 2
a pH indicator which displays altered colour between deprotonated and acid forms
Implementation Method 3
a UV radiation-driven acid release agent... capable of releasing a proton in response to exposure to UV radiation
Data Source
AI summary
A colourimetric indicator (5) comprises a UV radiation-driven acid release agent; a pH indicator which displays altered colour between deprotonated and acid forms; a proton-scavenging agent; and a UV stabiliser.