Single-Step Plastic Membrane Microfluidic Chip Fabrication
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Solution Overview
Problem
Conventional methods for fabricating microfluidic chips are costly, time-consuming, and not suitable for large-scale production, with two-step strategies limiting throughput and increasing costs, while single-step methods often require complex processes or are unsuitable for commercial applications due to high costs and limited feature resolution.
Innovation Solution
A single-step method using a combination of a negative mold, a thermal expanding membrane, a thermal adhesive membrane, and a thermal resistant membrane, where the membranes are layered on a compressible substrate and sealed using a heated negative mold, allowing for rapid and cost-effective fabrication of microchannels in microfluidic chips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional two-step fabrication strategy is used, then channel structures can be generated with good precision, but production cost increases and throughput decreases
Solution Approach 1:
The patent combines channel generation and channel sealing into a single simultaneous operation. The heated mold pressurizes the thermoplastic membrane to form channels while the adhesive membrane bonds to seal the channels at the same time, eliminating the sequential two-step process and thereby increasing production throughput without sacrificing channel structure precision.
Solution Approach 2:
The adhesive membrane is pre-applied to the substrate before channel formation. This preliminary action ensures that when the thermoplastic membrane is pressed and sealed in the single-step process, the sealing function is already in place, allowing simultaneous channel generation and sealing while maintaining precision.
2Manufacturing precision
If conventional two-step fabrication strategy is used, then channel structures can be generated with good precision, but fabrication cost increases
Solution Approach 1:
By merging channel generation and sealing into one simultaneous step using a heated mold, the patent eliminates the need for separate sealing equipment and operations. This consolidation reduces equipment investment, operational complexity, and fabrication costs while maintaining the precision required for functional microfluidic channels.
Solution Approach 2:
The patent employs disposable thermoplastic membranes that are sealed in a single low-cost hot-pressing operation. This approach eliminates the need for expensive reusable bonding equipment and complex alignment systems, significantly reducing fabrication costs while maintaining adequate channel precision for microfluidic applications.
3Productivity
If single-step fabrication strategy is used, then production speed increases, but feature resolution is limited
Solution Approach 1:
The patent controls the temperature and pressure parameters of the heated mold to optimize the thermoplastic membrane's deformation behavior. By carefully adjusting these parameters, the membrane can be pressed with sufficient force to create well-defined channels with good feature resolution, while the rapid heating and cooling enable fast production cycles.
Solution Approach 2:
The heated mold applies localized pressure and heat only to the regions where channels need to be formed, while other areas of the membrane remain unaffected. This localized action enables precise channel formation with good feature resolution in the critical areas, while the overall process remains fast due to the single-step nature of the operation.
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 method enables the ultra-fast and cost-effective production of flexible microfluidic chips, capable of performing various microfluidic functions such as valving, droplet formation, and capillary electrophoresis, with channels formed in under 12 seconds per piece at a cost of less than $0.02, making it suitable for commercial applications.
Implementation Method 1
heating the negative mold to a temperature sufficient to seal the three membranes; and contacting the heated negative mold with the thermal expanding membrane at a pressure sufficient to seal the three membranes. The negative mold holds a pattern negative to the microfluidic chip to be manufactured and has a melting point higher than the membranes to be sealed, wherein the thermal expanding membrane expands to form channels
Implementation Method 2
heating the negative mold to a temperature sufficient to seal the three membranes
Implementation Method 3
layering the three membranes on a compressible substrate
Data Source
AI summary
A method for fabricating flexible microfluidic chips with plastic membranes. In particular, the present invention provides a single-step method for microchannel fabrication of microfluidic chips in a fast and cost-efficient manner.