Microfluidic pH Regulation via Ladder-Shaped Anode Electrolysis
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Solution Overview
Problem
Conventional microfluidic devices face challenges in efficiently regulating pH within biological analysis processes due to the need for separate devices and solutions, which can lead to sample dilution and unreliable results, and existing electrolysis methods cause membrane swelling and non-uniform pH regulation.
Innovation Solution
A microfluidic device with a ladder-shaped anode and cathode chambers, supported by an ion exchange membrane and anode support structure, uses electrolysis to regulate pH efficiently, preventing membrane swelling and ensuring uniform current flow by using metals with high oxidization potential and hydrogen-absorbing cathodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pH-regulating solution is added to regulate pH, then pH can be regulated, but the sample solution is diluted and requires separate devices and processes
Solution Approach 1:
The patent replaces the mechanical approach of physically adding pH-regulating solutions with an electrochemical approach using electrolysis. Electrical energy is used to generate H⁺ ions at the anode and OH⁻ ions at the cathode directly within the sample solution, eliminating the need for external solution addition and preventing sample dilution while maintaining reliable pH control
Solution Approach 2:
The system uses the sample solution itself as the electrolyte for electrolysis, allowing the sample to regulate its own pH through electrochemical reactions. The H⁺ and OH⁻ ions generated during electrolysis directly adjust the pH of the sample solution in place, eliminating the need for separate pH-regulating solutions and maintaining sample integrity
2Device complexity
If electrolysis is used to regulate pH, then separate pH-regulating solutions are not needed, but the separation membrane swells and changes shape when solution contacts it
Solution Approach 1:
The patent applies a hydrophobic coating specifically to the separation membrane to create a localized property that repels aqueous solutions. This hydrophobic treatment prevents the membrane from absorbing water and swelling, while allowing it to perform its separation function. The coating is applied only where needed (on the membrane surface) without affecting the overall electrolysis process or pH regulation capability
3Volume of moving object
If small electrodes are used in electrolysis, then the device is compact, but there is a large difference in resistance between electrodes leading to non-uniform current flow
Solution Approach 1:
The patent divides each electrode into multiple smaller electrode units arranged in arrays. The anode consists of multiple anode units and the cathode consists of multiple cathode units, both spaced apart from each other. This segmentation increases the total effective surface area of the electrodes, reduces resistance, and ensures uniform current distribution throughout the sample solution, achieving both compact size and uniform pH regulation
Solution Approach 2:
The patent transitions from using single large electrodes to multiple small electrodes arranged in a spatial array configuration. By distributing electrodes across multiple dimensions (spatial arrangement), the system increases the effective electrode surface area and improves current distribution uniformity while maintaining a compact overall device volume
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 device achieves high-efficiency pH regulation with minimal sample dilution and uniformity, preventing membrane swelling and enabling rapid, reliable biological assays.
Implementation Method 1
an ion exchange membrane, an anode chamber, one side of which contacts a surface of the ion exchange membrane
Implementation Method 2
inducing electrolysis in each of the anode and cathode chambers by applying an electric current between the anode and cathode
Implementation Method 3
anode support part which supports the anode and prevents swelling of the ion exchange membrane
Data Source
AI summary
A microfluidic device includes; an ion exchange membrane, an anode chamber one side of which contacts a surface of the ion exchange membrane, wherein the anode chamber further includes a ladder-shaped anode and an anode support part, and a cathode chamber, one side of which contacts a surface of the ion exchange membrane opposite the anode chamber, wherein the cathode chamber further comprises a cathode, wherein the ladder-shaped anode is formed on a first surface of the anode support part, openings are formed in the anode support part which conform to the shape of the ladder-shaped anode, and a second surface of the anode support part which opposes the first surface of the anode contacts and supports the ion exchange membrane.