pH Indicator with Dissolving Coating for Precise Color Transition
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Solution Overview
Problem
Existing pH indicators with color-dependent properties are subjective to interpret, especially at the pKa range, and tend to lose their indicative color upon drying, making immediate reading necessary, which is not always feasible, and they cannot accurately detect specific pH transitions or non-monotonic pH changes.
Innovation Solution
A pH indicator with pH-dependent solubility properties, where a solid substrate is coated with substances that dissolve at specific pH ranges, exposing a distinct color, allowing for clear visible signals at predetermined pH transitions, and can be designed for specific pH changes and applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional pH indicator compounds are used, then pH indicators can be added to test samples or impregnated onto substrates, but the reading and interpretation is subjective and ambiguous at the pKa range
Solution Approach 1:
The patent employs color changes of conventional pH indicator compounds as the basis for detection. The substrate is designed to change color in response to pH changes, providing a visual signal that indicates whether the pH has crossed a predetermined threshold. This color change mechanism enables objective detection while maintaining ease of manufacture using standard indicator compounds.
Solution Approach 2:
The patent utilizes changes in the physical or chemical parameters of the substrate in response to pH changes. Specifically, the substrate's color parameter changes as a function of pH, allowing for objective detection of pH transitions. This parameter change approach resolves the subjectivity issue while maintaining manufacturing simplicity.
2Ease of manufacture
If conventional pH indicator strips are used, then pH indicators can be impregnated onto substrates, but the strips tend to lose their pH indicative color upon drying, requiring immediate reading
Solution Approach 1:
The patent applies a protective coating to the substrate that prevents color loss upon drying. This preliminary protective action allows the indicator strip to maintain its pH indicative color for extended periods after drying, eliminating the need for immediate reading while preserving the ease of manufacture using standard indicator impregnation techniques.
3Adaptability or versatility
If conventional pH indicators are used, then different colors can be displayed at different pH values, but they cannot accurately detect specific pH transitions or non-monotonic pH changes
Solution Approach 1:
The patent segments the pH detection range into multiple discrete thresholds by using multiple substrates or multiple coatings on a single substrate. Each substrate or coating is designed to detect a specific pH transition range, allowing for accurate detection of specific pH changes and non-monotonic pH profiles. This segmentation approach maintains adaptability for various applications while significantly improving measurement precision.
Solution Approach 2:
The patent applies different pH indicator properties to different regions or layers of the substrate. Each layer or region is designed with specific pH transition characteristics, enabling the system to detect multiple specific pH transitions simultaneously. This local differentiation of indicator properties provides both adaptability for various pH ranges and precision for detecting specific transitions.
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
Provides accurate and clear visible signals for specific pH transitions, reducing subjectivity and the need for immediate reading, and can be tailored for various applications, including food and biomedical uses, by using substances like amino acids and polymers with pH-dependent solubility.
Implementation Method 1
The at least one substance is selected to dissolve or to decompose when exposed to predetermined pH values, thereby exposing said second color
Data Source
AI summary
A pH indicator comprising a solid substrate coated at least partially by at least one layer of at least one substance, wherein said the and the substrate are having different colors and wherein the at least one substance is selected to dissolve or to decompose when exposed to predetermined pH values, thereby exposing said first color.