Microfluidic Channel Device for Fine Particle Concentration
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Solution Overview
Problem
Existing methods for increasing the concentration of fine particles, such as dielectrophoresis, face challenges like particle adsorption on electrodes and limited spatial range of effective electric fields, requiring parameter setting based on particle properties and dielectric constants, and do not effectively separate unwanted liquid.
Innovation Solution
A channel device with a specific structure that uses fluid-dynamic flows to capture and concentrate fine particles without electrostatic interactions, featuring a main channel, a chamber for concentrated particles, and side channels for draining unwanted liquid, where the side channels' dimensions are smaller than the particle size, allowing targeted particle capture and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If dielectrophoresis method is used to increase fine particle concentration, then fine particles can be captured and concentrated, but fine particles are adsorbed on the electrode surface
Solution Approach 1:
The patent replaces the electrostatic field-based dielectrophoresis method with a fluid-dynamic system using pressure-driven flow. The main channel and side channels create flow patterns that capture particles through hydrodynamic forces rather than electrostatic interactions, eliminating particle adsorption on electrodes while maintaining concentration capability
Solution Approach 2:
The invention uses pressure-driven fluid flow through specifically designed main channels and side channels to achieve particle concentration. The hydraulic system creates controlled flow patterns that enable particle capture and concentration without requiring electrodes, thus avoiding the harmful adsorption effect
2Quantity of substance
If dielectrophoresis method is used, then fine particles can be concentrated, but the spatial range of effective electric fields is limited
Solution Approach 1:
The channel device is segmented into multiple side channels connected to a main channel, creating multiple flow paths that collectively cover a larger spatial area. This segmentation allows the system to process and concentrate particles across a broader spatial range compared to a single electrostatic field region
Solution Approach 2:
The invention transitions from the limited spatial confinement of electrostatic fields to a three-dimensional channel network structure. The main channel and multiple side channels create a volumetric processing region that extends the effective area for particle concentration beyond what is achievable with planar electrode configurations
3Quantity of substance
If dielectrophoresis method is used, then fine particles can be concentrated, but electrophoresis parameters must be set according to particle properties and dielectric constant differences
Solution Approach 1:
The patent replaces the complex electrostatic field control requiring parameter optimization based on particle properties with a simpler pressure-driven flow system. The fluid-dynamic parameters can be adjusted independently of particle dielectric properties, significantly simplifying the operation and making the system more universally applicable to different particle types
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 effectively increases the concentration of fine particles by capturing and storing them in a chamber, while allowing unwanted liquid to drain, thereby enhancing concentration without relying on electrostatic interactions and improving separation efficiency.
Implementation Method 1
a side channel that is connected to a side face of the main channel and that is configured to allow unwanted liquid to drain therethrough
Implementation Method 2
a channel device which has a specific channel structure makes it possible to capture fine particles and increase the concentration of fine particles only using fluid-dynamic flows without relying on electrostatic interactions
Data Source
AI summary
Provided is a channel device that is capable of increasing the concentration of fine particles in a liquid only by use of fluid-dynamic flows without relying on electrostatic interactions. A channel device (1) in accordance with an embodiment of the present invention includes: a main channel (11) configured to allow a liquid containing fine particles to flow therethrough; a chamber (15) that is provided at an end of the main channel (11) and that is configured to store target fine particles which have increased in concentration; and a side channel (12) that is connected to a side face of the main channel (11) and that is configured to allow unwanted liquid to drain therethrough, wherein at least one of a height and a width of the side channel (12) is smaller than a particle size of the fine particles.