Microneedle Electrode Micropump Parallel Electric Field
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Solution Overview
Problem
Traditional electroosmotic micropumps face challenges in achieving efficient fluid flow due to the limitations of thin film microelectrodes, which cannot generate an electric field parallel to microchannels, and porous thin film microelectrodes that require precise alignment and often increase resistance.
Innovation Solution
The use of microneedle electrodes arranged opposite to each other at the inlet and outlet of fluid microchannels, which are energized to create a parallel and uniform electric field within the microchannels, thereby generating a stable electroosmotic driving force without direct conduction with the fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If thin film microelectrodes are used at the bottom of microchannels, then integration level is improved, but electric field generation parallel to microchannels is impossible, greatly reducing voltage utilization
Solution Approach 1:
The patent transitions from planar thin film electrodes at the bottom of microchannels to three-dimensional microneedle electrodes that protrude into the channel. This dimensional change allows the electrodes to generate electric fields parallel to the microchannel walls, enabling effective voltage utilization while maintaining integration through the microneedle structure
2Use of energy by moving object
If porous thin film microelectrodes are attached in parallel to inlet and outlet surfaces, then effective utilization of voltage is improved, but precise alignment is extremely difficult to realize
Solution Approach 1:
The patent divides the electrode structure into discrete microneedle elements rather than using continuous thin film electrodes. This segmentation allows the electrodes to be positioned at the inlet and outlet surfaces without requiring precise alignment between opposing electrodes, as each microneedle independently generates the necessary electric field
3Use of energy by moving object
If porous thin film microelectrodes are used, then voltage utilization is improved, but microelectrodes cover fluid pores, increasing resistance and reducing flow rate
Solution Approach 1:
The patent applies electrodes locally at the inlet and outlet surfaces through microneedle structures rather than covering the entire channel surface. This localized electrode placement generates the necessary electric field for electroosmotic flow without blocking fluid pores, thus maintaining high flow rates while achieving effective voltage utilization
4Power
If traditional thin film microelectrodes are energized, then electroosmotic driving is achieved, but hydrolysis, gas production, high heat production and corrosion occur, reducing stability and service life
Solution Approach 1:
The patent employs microneedle electrodes with surface coatings or protective layers that act as barriers between the electrode material and the fluid. This protective layer prevents direct electrochemical reactions such as hydrolysis and corrosion, eliminating gas production and excessive heat generation while maintaining the electroosmotic driving force
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 configuration enhances the effective utilization of voltage, improves the stability and service life of the micropump by preventing hydrolysis, gas production, high heat production, and corrosion, and increases the flow rate by ensuring a uniform electric field.
Implementation Method 1
An electroosmotic micropump is a micro-liquid driven device based on electroosmotic flow phenomenon
Data Source
AI summary
The present invention relates to the technical field of microfluidics, and specifically relates to an electroosmotic micropump apparatus and an electroosmotic micropump apparatus group. The electroosmotic micropump apparatus in the present invention comprises fluid micro channels and a microneedle electrode; each fluid micro channel is used for communicating a micro flow channel inlet with a micro flow channel outlet for pumping a fluid; the microneedle electrode comprises a first microneedle type electrode and a second microneedle type electrode that are respectively provided at the micro flow channel inlet and the micro flow channel outlet; the first microneedle type electrode and the second microneedle type electrode are oppositely arranged; moreover, neither of the first microneedle type electrode and the second microneedle type electrode is in conduction with the fluid micro channel. The electroosmotic micropump apparatus of the present invention can provide a parallel and uniform electric field for the interior of the fluid micro channel and generate a stable electroosmotic driving force, and can solve the hydrolysis problem of the surface of an electrode, thereby greatly improving the stability of the running of a micropump and prolonging the service life of the micropump.