Encapsulated Polar Protic Chemistries for RFID Temperature Monitoring
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Solution Overview
Problem
Existing environmental indicators for perishable products are often irreversible or require controlled storage conditions, making them impractical for widespread use in monitoring temperature exposure in supply chains.
Innovation Solution
Encapsulated polar protic chemistries are used in activatable environmental indicators that change electrical properties in response to temperature, allowing for detection via RFID tags, with microcapsules releasing the indicator material upon activation, enabling reliable monitoring of temperature exposure without pre-activation storage constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional irreversible indicators are used, then reliable historical exposure detection is achieved, but the indicators require controlled storage conditions prior to deployment
Solution Approach 1:
The indicator system performs preliminary encapsulation of the chemical indicator material in microcapsules during manufacturing. This pre-prepared state allows the indicator to be stored under normal conditions without requiring controlled storage environments, while still maintaining its ability to provide reliable historical exposure detection when activated during use.
Solution Approach 2:
The microcapsule acts as an intermediary between the chemical indicator material and the external environment. It protects the indicator material during storage and transport, allowing the system to be deployed without controlled storage conditions, while still enabling the indicator to detect temperature exposure reliably when the microcapsule is activated.
2Ease of operation
If activatable indicators with microcapsules are used, then storage flexibility is improved, but the device complexity increases
Solution Approach 1:
The microcapsule material is specifically designed to undergo a phase change or structural transformation at a predetermined temperature threshold. This parameter change allows the microcapsule to transition from an inactive encapsulated state to an active indicator state, providing storage flexibility while the phase change mechanism itself simplifies the activation process without requiring complex control systems.
Solution Approach 2:
The microcapsule utilizes phase transitions (such as melting or structural transformation) to activate the indicator material at a specific temperature threshold. This natural phase change mechanism provides simple, reliable activation without requiring complex electronic controls or additional actuation systems, thus managing device complexity while achieving storage flexibility.
3Measurement precision
If the indicator material is released from microcapsules upon temperature exposure, then temperature monitoring accuracy is improved, but the indicator material may be exposed to harmful conditions during storage
Solution Approach 1:
The microcapsule is designed as a single-use, disposable protective barrier. During storage and transport, it protects the indicator material from harmful environmental conditions. When temperature exposure occurs, the microcapsule activates and releases the indicator material, after which the microcapsule is discarded. This approach ensures temperature monitoring accuracy while protecting the indicator material during storage without requiring complex recovery or reuse 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 solution provides a reliable and practical means to monitor temperature exposure in perishable products, ensuring product safety by indicating exposure to excessive temperatures through changes in electrical properties detectable by RFID tags, without the need for controlled storage of the indicators.
Implementation Method 1
The microcapsules encapsulate the indicator material in a solid state and retain the indicator material when the indicator material transitions to a liquid state
Implementation Method 2
the indicator material, responsive to exposure to a temperature above the predetermined melting point, is configured to transition to the liquid state
Implementation Method 3
the indicator material, responsive to exposure to a temperature above the predetermined melting point, is configured to transition to the liquid state and to travel along or through the substrate to create cause a change in an electrical property of the electrical component
Data Source
AI summary
The use of encapsulated polar protic chemistries for RFID temperature monitoring are disclosed herein. An example activatable environmental indicator includes a substrate, an indicator material, and a plurality of microcapsules. The indicator material comprises a polar protic organic material. The plurality of microcapsules is on or embedded in the substrate and are configured to respond to at least one of an activation temperature and an activation pressure which allow the polar protic material to be released from the microcapsules. After being released from the microcapsules, the indicator material, responsive to exposure to a temperature above the predetermined melting point, is configured to transition to the liquid state and to travel along or through the substrate to create cause a change in an electrical property of the electrical component, the change in electrical property indicating that the activatable environmental indicator has been exposed to the temperature above the predetermined melting point.