Micro-fluidic Chip Droplet Sorting via Electric Force Control
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Solution Overview
Problem
Existing micro-fluidic systems face challenges in controlling the flow direction of microparticles with high speed and accuracy, as they require significant acting forces, making it difficult to achieve precise sorting using methods like laser trapping or optical forces.
Innovation Solution
A micro-fluidic chip with a hollow area and electrodes that introduces charged droplets, allowing for precise control of droplet movement using electric forces, combined with a piezoelectric element and microtube for segmenting liquids into droplets, enabling accurate sorting of microparticles into selected branch areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If laser trapping or optical force is used to control microparticle flow direction, then microparticles can be sorted by particle type, but the required acting force becomes excessively large making high-speed and high-accuracy control difficult
Solution Approach 1:
The patent introduces a charged droplet as an intermediary carrier to transport microparticles. Instead of directly applying large forces to microparticles, the system charges the droplet containing the microparticle and uses electric fields to manipulate the droplet's movement. This intermediary approach allows indirect control with smaller, more manageable forces while maintaining sorting accuracy.
Solution Approach 2:
The patent replaces optical forces (laser trapping) with electric forces for controlling droplet and microparticle movement. By using electrophoretic or electrostatic forces on charged droplets instead of optical radiation pressure, the system achieves comparable sorting precision with significantly reduced acting forces, enabling faster and more energy-efficient manipulation.
2Productivity
If conventional microparticle sorting methods are used, then particle analysis can be performed, but the flow direction control speed and accuracy are insufficient for efficient sorting
Solution Approach 1:
The patent changes the physical state and electrical properties of the carrier medium by charging droplets. This parameter change enables dynamic control of droplet movement direction and speed through electric field manipulation. The charged droplet system responds rapidly to electric field changes, achieving both high-speed switching for productivity and precise positioning for accuracy in microparticle sorting.
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
Enables high-speed and high-accuracy control of microparticle flow direction, allowing for efficient sorting and collection of microparticles into specific branch areas, improving the precision and efficiency of micro-total-analysis systems.
Implementation Method 1
a piezoelectric element and microtube for segmenting liquids into droplets
Implementation Method 2
the movement direction of the droplet in the hollow area is controlled based on electric force
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Disclosed herein is a micro-fluidic chip including a hollow area into which a charged droplet is introduced, and an electrode configured to be provided toward the hollow area. Movement direction of a droplet in the hollow area is controlled based on electric force acting between a charge given to the droplet and the electrode.