Electro-osmotic Pump with Reversible Electrode Reaction
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Solution Overview
Problem
Conventional electro-osmotic pumps face challenges in maintaining a stable flow rate and safety due to gas generation during reactions, and are limited in moving large volumes of fluid due to the consumption of electrode materials, making them unsuitable for continuous and large-scale fluid movement without gas production.
Innovation Solution
An electro-osmotic pump utilizing reversible electrode reactions with porous electrodes made of materials like Ag/Ag2O, MnO(OH), and polyaniline, which alternate voltage supply to enable continuous fluid movement and electrode repair, preventing gas generation and allowing for larger fluid volumes to be pumped without structural changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If platinum electrodes are used for electro-osmotic pumping, then the pump can operate without mechanical parts and control flow rate, but gas is continuously generated causing unstable flow rate and safety issues
Solution Approach 1:
The patent changes the electrode reaction parameters by using silver/silver oxide electrodes instead of platinum electrodes. This changes the electrochemical reaction from water decomposition (generating H2 and O2 gas) to silver oxidation and reduction reactions, which do not generate gas. The reaction products are solid silver and silver oxide that remain on the electrode surface, eliminating the harmful gas generation while maintaining electro-osmotic pumping functionality.
2Object-generated harmful factors
If consumable electrodes like silver/silver oxide are used to eliminate gas generation, then no gas is produced, but the electrode material is consumed limiting the pumpable fluid volume
Solution Approach 1:
The patent applies periodic action by alternating the polarity of the electrodes. During one half-cycle, the first electrode undergoes oxidation while the second undergoes reduction. During the next half-cycle, the roles reverse. This periodic reversal allows both electrodes to alternately consume and regenerate active material, effectively doubling the operational duration compared to a single consumable electrode system.
Solution Approach 2:
The patent implements discarding and recovering by having one electrode consume active material (silver oxidizing to silver oxide) while the other electrode recovers active material (silver oxide reducing to silver). The consumed electrode can be periodically regenerated by reversing the polarity, allowing the system to recover and reuse the electrode material, thus extending continuous operation time significantly.
3Device complexity
If platinum electrodes are used, then the structure remains simple, but the pump cannot move large volumes of fluid continuously due to gas generation and electrode consumption
Solution Approach 1:
The patent uses periodic polarity reversal to enable continuous large-volume fluid pumping. By alternating the voltage polarity between the two electrodes, the system maintains continuous electro-osmotic flow without the limitations of gas generation or electrode consumption. This periodic action allows the pump to move large volumes of fluid continuously while keeping the electrode structure relatively simple.
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 system enables the continuous movement of large fluid volumes over time without gas production, improving the usability and stability of the electro-osmotic pump by reversing electrode reactions to maintain electrode material integrity and control fluid flow direction.
Implementation Method 1
An electro-osmotic pump is a pump using the principle that a fluid moves due to electro-osmosis occurring when a voltage is applied to both ends of a capillary or a porous membrane by using electrodes
Implementation Method 2
In the positive (+) pole, an oxidization reaction of silver according to Reaction Formula 3 occurs
Implementation Method 3
in the negative (−) pole, a reduction reaction of a silver oxide according to Reaction Formula 4 occurs
Data Source
AI summary
An electro-osmotic pump using a reversible electrode reaction is provided, the electro-osmotic pump using a reversible electrode reaction comprising: a membrane that allows movement of a fluid; and first and second electrodes that are arranged on both sides of the membrane, respectively, and composed of a porous material or structure to allow the movement of the fluid, and a material to cause a reversible electrochemical reaction, wherein the first and second electrodes are alternately and reversely supplied with a voltage to make the electrochemical reaction repeat alternately forward and backward, and as a result, the alternate change of the movement direction of the fluid generates a pumping force to repair the first and second electrodes.