Microfluidic Device Using Traveling Potential Wave for Particle Translocation
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Solution Overview
Problem
Current microfluidic devices using electro-osmosis and dielectrophoresis for translocating charged particles in microfluidic channels face limitations in writing speed, which hinders further density increase and scalability in memory devices and other applications.
Innovation Solution
A microfluidic device with an actuator array of electrodes along the channel, where each electrode's voltage changes cyclically with a period multiplied by a natural number, and adjacent electrodes are out of phase, generating a potential wave to accelerate the translocation of charged particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electro-osmosis or dielectrophoresis is used to move particles, then particles can be translocated through the channel, but the writing speed is insufficient and limits further density increase
Solution Approach 1:
The patent applies periodic action by using a traveling potential wave generated through cyclic voltage application to electrodes. The voltage is applied periodically with adjacent electrodes out of phase, creating a moving potential landscape that propels particles forward in discrete jumps, significantly increasing translocation speed compared to continuous fields
Solution Approach 2:
The patent implements dynamics by transitioning from static electric fields to a dynamic traveling potential wave. The potential wave moves along the channel by sequentially activating electrodes in a wave-like pattern, creating a time-varying electric field that actively pushes particles forward rather than relying on passive drift
2Productivity
If the microfluidic channel is made longer to increase density, then storage capacity increases, but the passage time of particles through the channel increases
Solution Approach 1:
The periodic voltage application creates a traveling wave that maintains continuous forward propulsion of particles throughout the channel. This periodic driving mechanism ensures that particles experience consistent forward force even over long distances, preventing stagnation and maintaining fast translocation speeds across extended channel lengths
Solution Approach 2:
The channel is effectively segmented into multiple electrode zones, each contributing to the overall particle transport. The segmentation of the electric field into discrete electrode regions that activate in sequence allows the system to maintain high velocity across the entire channel length by providing localized propulsion zones rather than relying on a single continuous field
3Speed
If a traveling potential wave is generated using an array of electrodes, then translocation speed increases, but the device structure and circuitry become more complex
Solution Approach 1:
The electrode array segments the channel into multiple control zones, allowing independent voltage application to each segment. This segmentation enables the creation of a traveling wave pattern through simple sequential activation of adjacent electrodes, achieving fast particle transport while maintaining a modular and scalable structure
Solution Approach 2:
The electrode array serves multiple functions: it generates the traveling potential wave for particle propulsion, defines the channel geometry, and can potentially serve as both writing and reading elements. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity despite the enhanced translocation capability
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 approach enables faster translocation of charged particles, potentially exceeding the speed of existing methods, allowing for longer channels with shorter passage times and scalability, while maintaining uncomplicated structure and circuitry, suitable for various applications including colloidal nanofluidic memory devices.
Implementation Method 1
Mechanisms envisaged to write the information, which includes moving the particles into and through the channel, are electro-osmosis and dielectrophoresis. For dielectrophoresis, the speed of the particles also depends on the field frequency and the dielectric constant of the particles.
Implementation Method 2
Mechanisms envisaged to write the information, which includes moving the particles into and through the channel, are electro-osmosis and dielectrophoresis. Electro-osmosis includes creating an electric double layer by charging the inner sidewalls of the channel, while a vertical field would allow to move the mobile layer and pull the fluid.
Data Source
AI summary
A microfluidic device is provided. In one aspect, the microfluidic device includes a microfluidic channel, and a first actuator including an array of electrodes along the microfluidic channel. The first actuator is configured to generate a a potential wave along the microfluidic channel. Each electrode of the array can see its voltage changing cyclically according to a period multiplied by a natural number, wherein for at least one electrode the natural number equals 1. The cyclically changing voltages of adjacent electrodes can be out of phase. The cyclically changing voltages of every other electrode along the array can be in phase.