Microfluidic Chip Gap Control With Bead-Spaced Adhesive Layer
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Solution Overview
Problem
The manufacturing accuracy of microfluidic chips is hindered by non-uniform gaps between substrates, affecting droplet control and test accuracy, and battery safety is compromised due to swelling during charge-discharge cycles.
Innovation Solution
A microfluidic chip design featuring a gap control layer with uniformly sized gap beads arranged in an adhesive line between substrates, ensuring precise gap control and droplet movement, and a hydrophobic dielectric functional layer to seal and stabilize the chip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used for microfluidic chips, then production is simpler and faster, but the gap between substrates is non-uniform, reducing manufacturing precision and droplet control accuracy
Solution Approach 1:
The patent introduces a gap control layer as an intermediary component between the first and second substrates. This layer contains adhesive lines and gap beads that precisely control the gap distance, ensuring uniformity without complicating the overall chip structure. The gap control layer acts as a mediator that solves the gap uniformity problem while maintaining structural simplicity.
Solution Approach 2:
The patent replaces conventional mechanical bonding methods with a chemical bonding approach using adhesive lines. The adhesive lines, combined with gap beads, provide precise gap control through chemical adhesion rather than mechanical fastening, improving manufacturing precision without significantly increasing device complexity.
2Reliability
If the adhesive line is placed without considering the hydrophobic dielectric functional layer edge, then the sealing may be insufficient, but adding complex sealing structures increases device complexity
Solution Approach 1:
The patent applies local quality by positioning the adhesive line specifically along the outer edge of the hydrophobic dielectric functional layer. This localized placement ensures sealing exactly where needed at the interface between the functional layer and external environment, providing reliable sealing without requiring complex sealing structures throughout the entire chip.
3Manufacturing precision
If gap beads are placed on the hydrophobic dielectric functional layer, then alignment is simpler, but the low surface accuracy of the functional layer causes non-uniform gap height
Solution Approach 1:
The gap control layer serves as an intermediary platform that carries the gap beads. Instead of placing gap beads directly on the hydrophobic dielectric functional layer with its low surface accuracy, the gap control layer provides a stable, flat surface for gap bead placement, ensuring uniform gap height while simplifying the manufacturing process.
4Manufacturing precision
If the adhesive line does not cover the outer edge of the hydrophobic dielectric functional layer, then the chip structure is simpler, but medium oil or reagents leak and external impurities enter, affecting test accuracy
Solution Approach 1:
The adhesive line is configured with local quality by extending specifically to cover the outer edge of the hydrophobic dielectric functional layer. This targeted configuration ensures that the sealing is applied precisely where leakage and contamination occur, maintaining test accuracy without requiring excessive adhesive line coverage throughout the entire chip structure.
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
Enhances manufacturing accuracy, improves droplet control and test efficiency, and prolongs the service life of the microfluidic chip by maintaining uniform gaps and preventing leakage.
Implementation Method 1
the adhesive line can seal the edge of the hydrophobic dielectric functional layer
Implementation Method 2
control of a gap between the first substrate and the second substrate based on the size of the gap beads
Implementation Method 3
the first substrate includes a hydrophobic dielectric functional layer
Implementation Method 4
based on the electrowetting technology, control solid-liquid interface energy by electric potential and use the asymmetry of a contact angle of a droplet to generate a tangential push force
Data Source
AI summary
A microfluidic chip and a preparation method therefor, and a microfluidic system The microfluidic chip includes a first substrate a second substrate, and a gap control layer located between the first substrate and the second substrate wherein the gap control layer comprises an adhesive line and a plurality of gap beads of substantially the same size arranged at intervals in the adhesive line.