Deep Eutectic Solvent Temperature Indicators for Irreversible Monitoring
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Solution Overview
Problem
Existing temperature indicators for sensitive products do not provide a reliable, irreversible indication of exposure to freezing or elevated temperatures, as they often revert to their original state when temperatures return to safe ranges, making it difficult to monitor the quality of products like vaccines and foodstuffs.
Innovation Solution
The use of deep eutectic solvents (DES) in temperature change indicators, which exhibit distinct freezing and melting points, allowing for an observable and irreversible change when exposed to specific temperatures, maintaining the change even when temperatures return to safe ranges, and are contained within sealed housings for visibility and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional temperature indicators are used, then they can monitor temperature exposure, but they revert to original state when temperatures return to safe ranges, making indication unreliable
Solution Approach 1:
The patent utilizes phase transitions of deep eutectic solvents, which exhibit distinct freezing and melting points. When the solvent freezes, it provides a visible indication of temperature exposure. The key innovation is that the solvent maintains its frozen state even when temperatures return to safe ranges, providing a reliable and permanent indication. This is achieved by selecting deep eutectic solvents with appropriate phase transition characteristics that do not immediately revert upon temperature normalization.
2Reliability
If deep eutectic solvents with distinct freezing and melting points are used, then irreversible indication of temperature exposure is achieved, but the device complexity increases due to sealed housing requirements
Solution Approach 1:
The patent employs sealed housings or containers to enclose the deep eutectic solvent. These housings are designed to be transparent or translucent, allowing visual observation of the solvent's phase state. The sealing prevents contamination and maintains the integrity of the solvent system, while the transparency enables the indication function. This balance between sealing and visibility resolves the complexity issue by using simple, transparent encapsulation rather than complex mechanical structures.
Solution Approach 2:
The patent utilizes visual changes in the deep eutectic solvent, such as opacity changes or color transitions, to indicate temperature exposure. When the solvent freezes, it transitions from a clear liquid to an opaque or differently colored state, providing a easily observable indication. This visual property eliminates the need for complex electronic sensors or mechanical indicators, simplifying the overall device structure while maintaining reliable indication.
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 DES-based indicators provide a reliable and permanent visual or conductive indication of temperature exposure, ensuring the quality of products by maintaining the observable change beyond the exposure temperature, effectively monitoring freeze or heat damage.
Implementation Method 1
the DES exhibits a first characteristic when exposed to a first temperature and exhibits a second characteristic when exposed to a second temperature
Implementation Method 2
exhibits a first characteristic when exposed to a first temperature... Suitable DESs maintain the second characteristic when again exposed to the first temperature
Implementation Method 3
exhibits a second characteristic when exposed to a second temperature... maintaining the change even when temperatures return to safe ranges
Implementation Method 4
The DES can include a first component, a second component, and, optionally, additional components or additives... the first component comprises a hydrogen bond donor and the second component comprises an organic salt
Data Source
AI summary
An ascending/descending indicator can include a sealed housing that contains a deep eutectic solvent (DES) within the housing. The DES can include two or more components and is configured to exhibit a first characteristic when at a first temperature and to assume a second characteristic when exposed to a second temperature and to substantially maintain the second characteristic even when again exposed to the first temperature.