Composite Thermal Block Material for Uniform Ultra-Fast PCR Heating
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Solution Overview
Problem
Existing thermal blocks in PCR thermal cyclers face challenges with high specific heat and poor thermal conductivity, leading to unreliable temperature control during ultra-fast PCR, especially when multiple unit thermal blocks are involved.
Innovation Solution
A composite material comprising a powder metal and a metal nanowire with a core-shell structure, such as tin and silver-coated copper nanowires, is used to create a thermal block with low specific heat and improved thermal conductivity, ensuring uniform heat transfer paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If aluminum metal is used for the thermal block, then thermal conductivity is improved, but specific heat increases making it unsuitable for fast PCR
Solution Approach 1:
The patent uses a composite material consisting of tin powder (providing low specific heat) and metal nanowires with core-shell structure (providing high thermal conductivity). This composite approach allows simultaneous achievement of low specific heat and high thermal conductivity, resolving the contradiction between these two thermal properties that cannot be satisfied by aluminum alone.
2Temperature
If silver metal is used for the thermal block, then thermal conductivity and specific heat characteristics are improved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive silver with a composite of tin powder and metal nanowires. The nanowires provide the necessary thermal conductivity while tin provides low specific heat, achieving comparable performance to silver at much lower cost.
Solution Approach 2:
The patent changes the material composition parameters by using nanoscale metal wires with core-shell structure embedded in tin matrix, fundamentally altering the thermal properties to achieve high thermal conductivity without requiring expensive silver.
3Quantity of substance
If metal powder is used in composite material, then specific heat characteristics are improved, but thermal conductivity becomes poor leading to temperature deviations
Solution Approach 1:
The patent transitions from using metal powder (0D particles) to metal nanowires (1D structures) with core-shell configuration. This dimensional change provides continuous thermal conduction pathways through the nanowire networks, dramatically improving thermal conductivity while maintaining the low specific heat benefit of the tin-based composite.
Solution Approach 2:
The patent creates a composite where tin powder provides low specific heat and metal nanowires provide thermal conductivity pathways, achieving both low specific heat and high thermal conductivity simultaneously, eliminating the temperature deviation problems.
4Quantity of substance
If conventional composite material is used, then specific heat is reduced, but thermal conductivity remains insufficient for ultra-fast PCR reliability
Solution Approach 1:
The patent uses nanoscale metal wires with aspect ratios of 10:1 to 100:1, creating extended one-dimensional thermal conduction pathways throughout the composite. This dimensional structure ensures uniform heat distribution and consistent temperature control across all thermal blocks, achieving the reliability needed for ultra-fast PCR.
Solution Approach 2:
The patent develops a specialized composite with tin powder and metal nanowires that achieves both low specific heat and high thermal conductivity, ensuring consistent temperature control and eliminating deviations between multiple thermal blocks during ultra-fast PCR processes.
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 composite material significantly reduces deviations in temperature change rates between unit thermal blocks and within single blocks, enhancing the reliability and efficiency of PCR thermal cyclers even in ultra-fast PCR processes.
Implementation Method 1
a metal nanowire having a core-shell structure in which a shell containing a third metal is positioned on a core containing a second metal
Implementation Method 2
a composite material for a thermal block of a thermal cycler having excellent thermal conductivity and low specific heat
Data Source
AI summary
The present invention relates to a composite material for a thermal block of a thermal cycler. The composite material has both low specific heat characteristics and remarkably improved thermal conductivity, and thus, when the temperature of a thermal block, which is manufactured using the composite material, rises and falls, deviation in temperature change rate between a plurality of unit thermal blocks and/or in different areas in a unit thermal block can be remarkably reduced such that a PCR thermal cycler including the thermal block can ensure reliability even in ultrafast PCR.