Overlapping Liquid Guides for Membrane-Free Microfluidic Contactors
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Solution Overview
Problem
Existing micro-scale liquid-liquid contactors and separators face challenges with scalability, mass transfer efficiency, and manufacturing complexity, particularly due to the use of membranes and difficulty in achieving dual flow configurations without significant mixing of fluid phases.
Innovation Solution
The design incorporates overlapping liquid guides with different materials for the liquid-conducting layers, allowing for efficient contact and interaction between immiscible liquids without a membrane barrier, enabling scalable and high-throughput microfluidic devices with improved mass transfer and manufacturing simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a membrane is used to separate fluid phases in microfluidic contactors, then phase separation is achieved, but mass transfer between liquid phases decreases due to the membrane acting as a barrier
Solution Approach 1:
The invention removes the membrane barrier from the system entirely. Instead of using a membrane to separate phases, the patent employs gravity-driven phase separation where the denser liquid phase settles at the bottom and the lighter phase remains at the top, allowing direct liquid-liquid contact for mass transfer without any physical barrier interfering with the transfer process
Solution Approach 2:
The invention introduces a porous support structure as an intermediary element that provides mechanical support for the liquid phases while allowing free movement of both phases. This porous support enables the liquids to flow and contact each other directly without requiring a dense membrane barrier, thus maintaining mass transfer efficiency while providing structural integrity
2Productivity
If multiple parallel channels are implemented in microfluidic contactors, then throughput increases, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention transitions from a planar two-dimensional microfluidic channel design to a three-dimensional configuration where liquid guides extend vertically between housing portions. This vertical stacking allows multiple liquid guides to be arranged in parallel within a compact footprint, increasing throughput while maintaining manufacturing simplicity through standard assembly techniques
Solution Approach 2:
The invention divides the device into modular components including separate first and second housing portions, multiple discrete liquid guides, and individual porous supports. Each liquid guide can be independently manufactured and assembled, allowing parallel channels to be created through simple stacking rather than complex monolithic fabrication, thus increasing throughput without proportionally increasing manufacturing difficulty
3Manufacturing precision
If photolithography and laser machining processes are used to manufacture microfluidic devices, then manufacturing precision is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention employs disposable porous support elements and simple housing portions that can be manufactured using low-cost, conventional processes rather than expensive precision microfabrication. These components are designed to be assembled through simple stacking and sealing, eliminating the need for photolithography and laser machining while maintaining sufficient precision for the application
Solution Approach 2:
The invention changes the manufacturing approach from precision microfabrication of continuous channels to assembly of discrete components with larger tolerances. By using snap-fit connections, sealing members, and standard fastening techniques, the device achieves functional precision without requiring the complex and expensive manufacturing processes traditionally associated with microfluidic devices
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 approach enhances mass transfer and scalability while maintaining the separation of liquids, allowing for efficient heat and solute exchange without mixing, and simplifies the manufacturing process, making the devices more durable and cost-effective.
Implementation Method 1
efficient heat and solute exchange without mixing
Implementation Method 2
enhances mass transfer and scalability while maintaining the separation of liquids
Data Source
AI summary
An assembly comprises a first liquid guide having an inlet, an outlet, and a liquid-conducting layer comprising a first material. The liquid-conducting layer extends between the inlet and the outlet. A second liquid guide has an inlet, an outlet, and a liquid-conducting layer comprising a second material. The liquid-conducting layer extends between the inlet and the outlet. At least a portion of the liquid-conducting layer of the second liquid guide overlaps the liquid-conducting layer of the first liquid guide such that, when a first liquid flows along the liquid-conducting layer of the first liquid guide and a second liquid flows along the liquid-conducting layer of the second liquid guide, the second liquid contacts the first liquid along the portion of the liquid-conducting layer of the second liquid guide that overlaps the liquid-conducting layer of the first liquid guide.