Metal Sulfide Peroxide Indicator with Enhanced Stability
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Solution Overview
Problem
Current indicators for detecting peroxides, such as hydrogen peroxide, ozone, and peracetic acid, face issues with preservation stability, light resistance, and visibility, particularly when using organic compounds, which tend to deteriorate and make it difficult to distinguish intermediate discoloration points.
Innovation Solution
A powdery metal sulfide-based indicator that reacts with peroxides to change hue, using bismuth sulfide, antimony sulfide, tungsten sulfide, or cobalt sulfide as discoloration components, applied on a substrate with an invariable chromatic dye and an iron compound to enhance visibility and stability, and packaged in breathable materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic compounds are used as discoloration components in peroxide indicators, then the indicators can change color during sterilization treatment, but the indicators exhibit poor preservation stability and light resistance, leading to color deterioration
Solution Approach 1:
The patent changes the chemical composition parameter from organic compounds to inorganic metal sulfide particles, fundamentally altering the material's stability characteristics while maintaining its color change functionality in response to peroxide exposure
Solution Approach 2:
The patent creates a composite indicator system combining metal sulfide particles with binder materials and optional auxiliary color couplers, achieving both stability and color change capability through material composition
2Ease of manufacture
If organic dyestuffs are used in peroxide indicators, then the indicators can display color changes, but the hue changes from chromatic to chromatic or between close colors, making intermediate discoloration points difficult to distinguish
Solution Approach 1:
The patent utilizes the inherent color transformation properties of metal sulfide particles when exposed to peroxide, achieving distinct color changes that provide clear visual information about the sterilization process progression
Solution Approach 2:
The patent introduces auxiliary color couplers as intermediary substances that enhance and modify the color change response of metal sulfide particles, improving the visibility and distinguishability of intermediate discoloration states
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 indicator provides clear and distinguishable discoloration from grayish black to white or chromatic colors, maintaining stability under various environmental conditions, including light and humidity, and allows for adjustable discoloration rates, ensuring effective detection of peroxide exposure and sterilization treatment confirmation.
Implementation Method 1
powdery metal sulfide that undergoes discoloration through reacting with the peroxide
Data Source
AI summary
An indicator for detecting peroxide can detect the peroxide through change of hue thereof by reacting the peroxide according to a predefined concentration and a predefined sterilization treatment condition thereof. The indicator has better resistance against weather or light and preservation stability than those of prior indicators including inorganic compounds or organic compounds as discoloration components, can clearly change an arbitrary hue thereof under suitable discoloration rate, and has visible distinguishability. The indicator for detecting peroxide includes powdery metal sulfide, that undergoes discoloration by reacting with the peroxide. In particular a discoloration layer including the metal sulfide is applied onto at least a portion of a base substrate.