Microfluidic Chip Manifolds for High-Pressure Sealing
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Solution Overview
Problem
Existing microfluidic systems face challenges in maintaining high-pressure sealing and minimizing chip cracking under extreme conditions, particularly in applications requiring pressures above 300 bar, such as oil and gas research.
Innovation Solution
A microfluidic assembly comprising a base, cover, and jack that sandwiches a microfluidic chip between them, using a hydraulic jack to apply a confining pressure of at least 5 tons, ensuring a high-pressure seal and minimizing chip cracking through a chemically strengthened glass panel bonded to a silicon wafer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a microfluidic chip is subjected to high pressure (above 300 bar), then fluid delivery capability is improved, but chip cracking and bursting risk increases
Solution Approach 1:
The patent applies chemical strengthening treatment to the glass panel, fundamentally changing the material parameters by creating a compressed stress layer on the surface. This increases the chip's burst pressure capacity from typical values to over 700 bar, allowing the chip to withstand high fluid pressures without cracking while maintaining structural integrity.
Solution Approach 2:
The microfluidic chip is constructed as a composite structure with a chemically strengthened glass panel bonded to a silicon wafer. This composite design combines the optical transparency and chemical resistance of glass with the mechanical strength and microfabrication capabilities of silicon, creating a chip that can withstand high pressures up to 700 bar while maintaining functional performance.
2Reliability
If a seal is compressed to ensure high-pressure sealing, then sealing reliability is improved, but the microfluidic chip may crack under excessive compression
Solution Approach 1:
The chemical strengthening process creates a permanent compressive stress profile within the glass panel that is optimized to withstand high external pressures. This parameter change allows the glass to maintain its structural integrity even when additional compression is applied for sealing purposes, as the pre-compressed surface layer prevents crack propagation under the sealing load.
Solution Approach 2:
The glass panel undergoes chemical strengthening treatment before being assembled into the microfluidic chip. This preliminary action pre-establishes the stress distribution and structural properties needed to withstand both the sealing compression and the high fluid pressures, preventing cracking during both assembly and operation.
3Strength
If confining pressure is applied to prevent chip bursting, then chip protection is improved, but the assembly complexity increases
Solution Approach 1:
The chemical strengthening of the glass panel fundamentally changes the pressure resistance parameters of the chip, allowing it to withstand fluid pressures exceeding 700 bar without external confining pressure. This eliminates the need for complex confining pressure application mechanisms, simplifying the overall assembly while maintaining chip protection against bursting.
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 assembly enables reliable high-pressure fluid delivery up to 700 bar without chip bursting, facilitating applications like subterranean formation modeling and PVT measurements.
Implementation Method 1
using a hydraulic jack to apply a confining pressure of at least 5 tons
Implementation Method 2
the jack forces the base and the cover together to sandwich the microfluidic chip between base and the cover with the base and the cover bearing against the microfluidic chip to apply a confining pressure
Implementation Method 3
with the first seal compressed between the microfluidic chip and the base block to seal the first fluid channel in fluid communication with the first microfluidic inlet
Implementation Method 4
minimizing chip cracking under extreme conditions... through a chemically strengthened glass panel bonded to a silicon wafer
Data Source
AI summary
A microfluidic assembly includes a jack for forcing a base and a cover together to sandwich a microfluidic chip between base and the cover, with the base and the cover bearing against the microfluidic chip to apply a confining pressure to the microfluidic chip, and with a seal compressed between the microfluidic chip and the base to seal a fluid channel of the base in fluid communication with a microfluidic inlet of the microfluidic chip. A microfluidic chip includes a silicon wafer having at least a first microfluidic channel etched therein, and a chemically strengthened glass panel bonded to the silicon wafer to cover the microfluidic channel.