Microchannel Chip Deformation Prevention via Thin COP Joining Layer
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Solution Overview
Problem
Microchannel chips face channel deformation during high-temperature and high-pressure sterilization treatments when a thick joining layer is used, and conventional adhesive materials cause autofluorescence noise during optical signal detection, especially when cycloolefin polymer substrates are employed.
Innovation Solution
A microchannel chip design using a thin cycloolefin polymer joining layer with specific glass-transition temperature relationships between the channel and lid substrates, ensuring strong joining performance without channel deformation, achieved by forming the channel and lid substrates from cycloolefin polymers and using a joining layer thickness of less than 50 μm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thick joining layer is used to ensure strong joining performance, then substrate joining strength is improved, but channel deformation occurs during high-temperature and high-pressure sterilization treatment
Solution Approach 1:
The invention changes the thickness parameter of the joining layer from conventional thick layers to a thin layer of 1 μm or less. This parameter change allows the joining layer to provide sufficient joining strength while minimizing its influence on channel shape during high-temperature sterilization, thus preventing channel deformation.
Solution Approach 2:
The invention uses a thin film joining layer (1 μm or less) instead of a thick joining layer. This thin film approach enables the joining layer to maintain substrate bonding while being thin enough to not cause significant channel deformation under sterilization conditions.
2Strength
If conventional adhesive materials are used to achieve strong joining performance, then substrate joining strength is improved, but autofluorescence noise occurs during optical signal detection
Solution Approach 1:
The invention extracts and removes the harmful autofluorescence property from the joining system by eliminating conventional adhesive materials that cause autofluorescence. The thin joining layer of cycloolefin polymer is used instead, which provides joining strength without the harmful autofluorescence noise that interferes with optical signal detection.
Solution Approach 2:
The invention uses the same material (cycloolefin polymer) for both the substrate and the joining layer, ensuring material homogeneity. This eliminates the interface between different materials that would otherwise cause autofluorescence noise, while maintaining strong joining performance through thermal fusion.
3Object-generated harmful factors
If cycloolefin polymer is used for the entire microchannel chip to eliminate autofluorescence noise, then optical signal detection quality is improved, but joining performance deteriorates without conventional adhesive materials
Solution Approach 1:
The invention changes the thickness parameter of the joining layer to 1 μm or less, which enables the cycloolefin polymer joining layer to provide sufficient joining strength without requiring conventional adhesive materials. This thin layer configuration maintains strong bonding while eliminating autofluorescence noise.
Solution Approach 2:
The invention creates a composite structure where a thin joining layer of cycloolefin polymer is formed between cycloolefin polymer substrates. This composite approach uses the thin layer to provide both joining function and optical transparency, achieving strong bonding without autofluorescence noise from conventional adhesives.
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 prevents channel deformation during sterilization and maintains strong substrate joining performance, eliminating autofluorescence noise from adhesive materials, thus ensuring reliable optical signal detection and durability.
Implementation Method 1
a step of joining a channel substrate and a lid substrate via a joining layer by thermal fusion
Data Source
AI summary
A microchannel chip with which channel deformation does not occur even when high-temperature and high-pressure sterilization treatment is performed and with which strong joining performance of substrates is maintained; and a method for manufacturing the same are provided. A microchannel chip comprising: a channel substrate having a microchannel formed on at least one surface thereof; a lid substrate; and a joining layer joining the channel substrate and the lid substrate, wherein the channel substrate, the lid substrate, and the joining layer are each formed of a cycloolefin polymer, a glass-transition temperature Tgs1 of a cycloolefin polymer forming the channel substrate, a glass-transition temperature Tgs2 of a cycloolefin polymer forming the lid substrate, and a glass-transition temperature Tg2 of a cycloolefin polymer forming the joining layer have relationships: Tgs1>Tg2; and Tgs2>Tg2, and the joining layer has a thickness within a specific range.