Chemical Temperature Control Using Phase Change Heating
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Solution Overview
Problem
Current diagnostic technologies, such as PCR and isothermal nucleic acid amplification methods, require precise temperature control, which is often achieved using energetically expensive thermal cyclers, making them unsuitable for resource-limited settings like developing countries or remote surveillance.
Innovation Solution
A non-instrumented assay platform utilizing exothermic chemical reagent mixtures and phase change materials to maintain constant output temperatures, enabling reverse-transcription and isothermal nucleic acid signal amplification without the need for external equipment, through chemical heating and cooling elements that regulate temperature using exothermic or endothermic reactions and phase change materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal cyclers are used for PCR temperature control, then temperature precision is improved, but device cost and energy consumption increase
Solution Approach 1:
The patent employs phase change materials (PCMs) that undergo phase transitions at specific temperatures to maintain constant temperature during PCR processes. The PCM absorbs or releases latent heat during phase change, providing passive temperature regulation without requiring active thermal cycler equipment, thereby reducing device cost while maintaining temperature precision.
Solution Approach 2:
The system uses self-regulating phase change materials that automatically maintain temperature without external control mechanisms. The PCM inherently regulates temperature through its phase transition properties, eliminating the need for complex thermal cycler systems with sensors, heaters, and controllers, thus reducing both device cost and complexity.
2Measurement precision
If thermal cyclers are used for PCR temperature control, then temperature precision is improved, but energy consumption increases
Solution Approach 1:
Phase change materials provide passive temperature regulation by absorbing or releasing latent heat during phase transitions. This eliminates the need for continuous energy input from thermal cyclers, significantly reducing energy consumption while maintaining the temperature precision required for PCR amplification.
Solution Approach 2:
The phase change materials self-regulate temperature without requiring external energy input or control systems. The inherent thermodynamic properties of the PCM provide automatic temperature stabilization, eliminating the energy-consuming heating and cooling cycles of traditional thermal cyclers.
3Device complexity
If exothermic chemical reagent mixtures are used for heating, then device simplicity is improved, but temperature control precision deteriorates
Solution Approach 1:
The patent combines exothermic chemical reactions with phase change materials to achieve both simplicity and precision. The chemical reaction provides the heat source, while the PCM regulates the temperature through phase transitions, creating a self-regulating system that is simple in design but precise in temperature control.
Solution Approach 2:
The system uses composite heating elements that combine exothermic chemical reagents with phase change materials. This composite approach integrates the heat-generating capability of chemical reactions with the temperature-regulating properties of PCMs, achieving both device simplicity and temperature control precision simultaneously.
4Productivity
If isothermal amplification methods are used, then amplification efficiency is improved, but temperature control requirements become more stringent
Solution Approach 1:
Phase change materials provide inherent temperature stabilization at the specific transition temperature, which is ideal for isothermal amplification methods. The PCM maintains a constant temperature plateau during phase transition, ensuring the precise temperature control required for efficient isothermal nucleic acid amplification without requiring complex active control 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
This solution allows for precise temperature control in diagnostic devices, facilitating sensitive and specific PCR assays and nucleic acid amplification in resource-constrained environments, eliminating the need for expensive thermal cyclers and enabling early detection of infectious diseases.
Implementation Method 1
The heating element comprises an exothermic chemical reagent mixture
Implementation Method 2
a temperature regulating element comprising a phase change material that thermally cooperate to maintain a constant output temperature
Implementation Method 3
generates heat as a consequence of crystallizing a supercooled liquid and generates heat at a constant temperature as a consequence of the liquid form of the exothermic phase change material being in equilibrium with the solid form
Implementation Method 4
crystallizing a supercooled liquid
Data Source
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AI summary
Exothermic and/or endothermic chemical reactions in combination with phase change materials can produce output temperature(s) within strict tolerances without requiring expensive and complicated external equipment to generate and maintain an output temperature. Similarly, an exothermic phase change material, which generates heat as a consequence of crystallizing a supercooled liquid, can generate heat at a constant temperature, without requiring expensive and complicated external equipment, as a consequence of the liquid form of the exothermic phase change material being in equilibrium with the solid form of the exothermic phase change material. Numerous biological and chemical processes and/or diagnostic devices require a constant temperature or temperatures for set periods of time. An example completely non- instrumented diagnostic platform based on nucleic acid amplification is described, which is particularly suited for use in developing countries that may not have access to expensive and complicated external equipment.