Microfluidic Free-Flow Electrophoresis Device for Bubble-Free Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional microfluidic free-flow electrophoresis devices face instability and sensitivity issues due to gas bubble formation at the electrode/liquid interface, which affects fluid flow and separation efficiency, and existing solutions introduce additional limitations such as intricate fabrication or restricted electric current/field.
Innovation Solution
A microfluidic device design featuring electrolyte channels with positive and negative electrodes at downstream outlets to actively remove electrophoresis products and gas bubbles, maintaining a homogeneous electric field across the separation channel, and using high conductivity electrolyte solutions to transport these products away from the separation channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrodes are incorporated into the microfluidic device for free-flow electrophoresis, then electrophoresis separation can be performed, but gas bubbles form at the electrode/liquid interface causing fluid flow instability and separation instability
Solution Approach 1:
The patent extracts the harmful electrode/liquid interface from the microfluidic separation channel by placing electrodes in a separate chamber. The interface is removed from the separation zone, eliminating gas bubble formation within the channel while maintaining electrophoresis functionality through the membrane interface.
Solution Approach 2:
The device is segmented into distinct functional zones: an electrode chamber separated from the separation channel by a membrane. This segmentation isolates the harmful electrolysis reactions to a dedicated compartment while preserving the separation function in the main channel.
2Object-affected harmful factors
If membranes are used to separate the analytical chamber from electrode beds, then gas bubble impact is reduced, but fabrication becomes intricate and electric current/field limitations are imposed
Solution Approach 1:
A membrane acts as an intermediary element between the electrode chamber and separation channel. It selectively allows ion transport for current conduction while physically blocking gas bubbles from entering the separation zone, simplifying the overall device structure compared to fully integrated electrode designs.
3Object-affected harmful factors
If redox electron carriers are used to suppress gas bubble formation, then bubble issues are alleviated, but significant limitations on applicable electric current/field are imposed
Solution Approach 1:
The patent extracts the electrolysis reaction zone from the separation channel by placing electrodes in a separate chamber. This allows the use of high current densities at the electrodes without affecting the separation channel, eliminating the need for redox carriers and their current limitations while maintaining bubble-free separation.
4Object-affected harmful factors
If external electrodes are placed at both inlets and outlets of the microfluidic chip, then gas bubbles are prevented from being introduced, but electrolysis products and heat still flow through the microfluidic device
Solution Approach 1:
The patent extracts the electrode placement to a separate chamber outside the microfluidic chip. This configuration prevents both gas bubbles and electrolysis products from entering the separation channel, while heat is managed through the electrolyte flow in the external chamber rather than through the delicate microfluidic structures.
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 design stabilizes fluid flow and enhances separation resolution for charged particles like nucleic acids and proteins by preventing gas bubbles and heat from entering the separation channel, allowing for strong electric fields without disruption, resulting in improved separation efficiency and resolution.
Implementation Method 1
The presence of the electrolyte provides a substantially homogenous electric field across the separation channel
Implementation Method 2
the flow of electrolyte through the first and second electrolyte channels removes electrophoresis products and gas bubbles from the device
Implementation Method 3
The generation of electrolysis products at the electrode/liquid interface
Implementation Method 4
separation and analysis of charged particles in microfluidic devices using free flow electrophoresis
Implementation Method 5
The removal of electrolyte products from the microfluidic device may provide a more stable flow profile of fluids within the microfluidic device
Data Source
AI summary
A microfluidic device (11) is provided for separation and analysis of microfluidic samples. The device comprises: a separation channel (10); a first electrolyte channel (12) configured to provide a flow of high conductivity electrolyte solution, in use; and provided with a positive electrode (13) at a downstream outlet of the channel; a second electrolyte channel (14) configured to provide a flow of high conductivity electrolyte solution, in use, and provided with a negative electrode (15) at a downstream outlet of the channel; and wherein the flow of electrolyte through the first and second electrolyte channels removes electrophoresis products and gas bubbles from the device; and wherein the presence of the electrolyte provides a substantially homogenous electric field across the separation channel.