Micromixer Biochip Vortex Mixing via Flexible Channel Deformation
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Solution Overview
Problem
Conventional micromixers suffer from poor mixing performance and require large volumes of samples, making them inefficient for biochemical applications, especially when dealing with small-scale substances and nanometer-scale particles.
Innovation Solution
A micromixer biochip with a three-layer structure, featuring a substrate, a fluidic channel layer with single-opening channels whose axis does not pass through the center of the mixing chamber, and an air chamber layer, inducing up-and-down deformations to generate vortex flows for active mixing, allowing for rapid and effective mixing of small-scale substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If passive mixing methods are used in conventional micromixers, then the device structure is simple, but the mixing performance is poor and mixing time is long
Solution Approach 1:
The patent employs dynamic mixing by rotating the inner cylinder at controlled speeds to generate vortex flows and turbulent mixing patterns. This dynamic approach transforms the static passive mixing structure into an active mixing system that achieves superior mixing performance while maintaining reasonable structural complexity
Solution Approach 2:
The rotation of the inner cylinder creates mechanical vibrations and turbulent flow patterns within the fluid samples. These vibrations enhance mixing efficiency by disrupting laminar flow and promoting rapid diffusion between different fluid streams
2Quantity of substance
If conventional micromixers use large measuring cups or magnetic bars, then mixing can be achieved, but the volume consumed is great and mixing time increases
Solution Approach 1:
The mixing chamber is segmented into an inner rotating cylinder and an outer stationary cylinder, creating multiple flow paths and mixing zones. This segmentation allows efficient mixing of small sample volumes by creating localized turbulent regions throughout the chamber
Solution Approach 2:
The patent uses fluid dynamics and hydraulic principles by rotating the inner cylinder to generate vortex flows and centrifugal forces that drive mixing. This pneumatic-hydraulic approach enables rapid mixing of microliter-scale samples without requiring large volumes or extended mixing times
3Device complexity
If passive blocking or bending structures are used for mixing, then the design is simple, but substances take much time to be completely mixed
Solution Approach 1:
The system transitions from static blocking/bending structures to dynamic rotating cylinder structures that actively propel fluids through vortex flows. This dynamic mechanism dramatically reduces mixing duration by creating continuous fluid motion and enhancing mass transfer rates
Solution Approach 2:
The patent changes the mixing mechanism from passive geometric structures to active rotational motion with controllable speed parameters. By adjusting the rotation speed of the inner cylinder, the mixing duration and intensity can be optimized to achieve complete mixing in minimal time
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 biochip achieves rapid and efficient mixing of small-scale substances by generating vortex flows, overcoming the limitations of conventional passive mixing methods, with the ability to control mixing performance through adjustable air pressure frequencies, resulting in complete mixing within seconds.
Implementation Method 1
frequently controlling the pressure inside the air chambers induces the top portion of the single-opening fluidic channel to undergo up-and-down deformations
Implementation Method 2
the moving fluids can generate a vortex flow in the mixing chamber and accomplish the mixing effect
Data Source
AI summary
The present invention provides a micromixer biochip, comprising: a substrate having a surface; a fluidic channel layer disposed above the surface of the substrate, including a mixing chamber and a single-opening fluidic channel, wherein one end of the single-opening fluidic channel is closed and the other end of the single-opening fluidic channel connects to the mixing chamber, and a top portion of the single-opening fluidic channel is made of a flexible material; and an air chamber layer disposed above the top portion of the fluidic channel layer, including an air pore, at least one chamber, and an air channel connecting the chamber and the air pore, wherein the number and position of the air chamber correspond to the number and position of the single-opening fluidic channel of the fluidic channel layer.