Microfluidic pH Control via Electrolysis Chamber Volume Ratio
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Solution Overview
Problem
Conventional microfluidic devices face challenges in pH control during biological analysis due to issues with dilution, mixing, and flow in microchannels, and existing methods do not effectively utilize electrolysis to generate hydrogen and hydroxide ions for in-situ pH adjustment.
Innovation Solution
A method using a microfluidic device with an electrolysis device featuring an anode and cathode chamber, where solutions with specific potentials are electrolyzed and mixed in equal volumes to control pH, with the volume ratio of the chambers adjusted to achieve a target pH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pH-adjusting materials are added to control pH in microfluidic devices, then pH control is achieved, but dilution and mixing problems occur in microchannels
Solution Approach 1:
The system uses the sample solution itself as the electrolyte for electrolysis, generating H+ and OH- ions in-situ without requiring external pH-adjusting materials. This self-service approach eliminates the need for additional reagents that would cause dilution or mixing issues in the microchannel system.
Solution Approach 2:
The method extracts the pH control function from external chemical reagents and transfers it to an electrolysis-based generation system. By taking out the dependency on external pH-adjusting materials, the system avoids the associated problems of dilution and mixing while maintaining precise pH control capability.
2Measurement precision
If pH-adjusting materials are added to control pH, then pH adjustment is achieved, but subsequent biological analysis processes are inhibited
Solution Approach 1:
The system generates pH-adjusting ions (H+ and OH-) through electrolysis of the sample solution itself, eliminating the need for external pH-adjusting chemicals. This self-service mechanism ensures that no foreign substances are introduced that could inhibit subsequent biological analysis processes, thereby maintaining reliability.
Solution Approach 2:
The method converts the potential harm of introducing foreign chemicals into a benefit by using electrolysis to generate the necessary ions from the sample itself. This approach transforms what would be a harmful contamination issue into a beneficial in-situ generation process that maintains sample purity and biological compatibility.
3Productivity
If conventional electrolysis is used without controlling chamber volume ratios, then electrolysis occurs, but pH control precision is insufficient
Solution Approach 1:
The system dynamically adjusts the volume ratio parameter between the anode and cathode chambers to precisely control the relative amounts of H+ and OH- ions generated. By changing this geometric parameter, the system achieves precise pH control while maintaining efficient electrolysis operation, resolving the contradiction between productivity and precision.
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 allows for precise pH control without additional pH-adjusting materials, preventing inhibition of subsequent biological processes and maintaining stability of biological molecules, enabling efficient biological analysis.
Implementation Method 1
applying a voltage between the electrode in the anode chamber and the electrode in the cathode chamber to induce electrolysis in the anode chamber and the cathode chamber thereby producing an acidic anode-electrolyzed solution and a basic cathode-electrolyzed solution
Data Source
AI summary
Provided is a method of controlling the pH of a solution using electrolysis in a microfluidic device comprising an electrolysis device including an anode chamber, a cathode chamber, and a partition membrane between the anode chamber and the cathode chamber, wherein the anode chamber includes an inlet and an outlet through which an anode chamber solution enters and is discharged from the anode chamber, respectively, and an electrode, and the cathode chamber includes an inlet and an outlet through which a cathode chamber solution enters and is discharged from the cathode chamber, respectively, and an electrode. The method includes: flowing the anode chamber solution containing a compound having a lower standard oxidation potential than water into the anode chamber through the inlet of the anode chamber; flowing the cathode chamber solution containing a compound having a lower standard reduction potential than water into the cathode chamber through the inlet of the cathode chamber; applying voltage between the electrode in the anode chamber and the electrode in the cathode chamber to induce electrolysis in the anode chamber and the cathode chamber; and mixing equal volumes of the acidic anode-electrolyzed solution and the basic cathode-electrolyzed solution, wherein the volumes of the cathode chamber and the anode chamber are controlled in a predetermined ratio according to a target pH of a solution obtained by mixing the acidic anode-electrolyzed solution and the basic cathode-electrolyzed solution.