Microfluidic Device Ferromagnetic Auxiliary Structure
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Solution Overview
Problem
Current methods for separating magnetic molecular entities, such as ions and molecules, are not cost-efficient and often result in inefficient separation due to turbulence and re-mixing of flows in traditional microfluidic devices.
Innovation Solution
A microfluidic device with a planar spiral portion and a ferromagnetic auxiliary structure that distorts the external magnetic field, creating a strong gradient for efficient separation of magnetic molecular entities, minimizing turbulence and re-mixing through a laminar flow design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional microfluidic device is used for separation, then the device structure is simple, but turbulence and re-mixing occur leading to inefficient separation
Solution Approach 1:
The fluid channel is divided into multiple segments with different functions: a first fluid channel for introducing sample, a second fluid channel for introducing magnetically labeled entities, and a mixing channel where the ferromagnetic auxiliary structure is positioned. This segmentation allows independent optimization of each channel while achieving efficient separation through the auxiliary structure's magnetic field distortion.
Solution Approach 2:
A ferromagnetic auxiliary structure is introduced as an intermediary element in the mixing channel. This auxiliary structure distorts the external magnetic field to create strong magnetic field gradients that enhance the separation of magnetic molecular entities while maintaining a relatively simple overall device structure.
2Reliability
If magnetic field gradient is increased for better separation, then separation efficiency improves, but device complexity and cost increase
Solution Approach 1:
The ferromagnetic auxiliary structure utilizes the external magnetic field itself to generate the separation mechanism. The auxiliary structure's ferromagnetic properties cause it to respond to and distort the external magnetic field, creating strong gradients without requiring additional complex magnetic field generation components. The system uses the external field's energy efficiently through the auxiliary structure's magnetic properties.
Solution Approach 2:
The auxiliary structure changes the magnetic field parameters by distorting the external magnetic field distribution. This creates localized regions of high magnetic field gradient strength within the fluid channel, enhancing separation efficiency without increasing the overall magnetic field generation system complexity or cost.
3Reliability
If ferromagnetic auxiliary structure is added to create strong magnetic field gradient, then separation efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The ferromagnetic auxiliary structure can be implemented using porous ferromagnetic materials or ferromagnetic particles suspended in a matrix. These porous structures provide high magnetic permeability and strong field distortion capabilities while being manufacturable through standard microfabrication techniques such as ceramic sintering or 3D printing with ferromagnetic materials.
Solution Approach 2:
The auxiliary structure utilizes composite materials combining ferromagnetic substances with suitable matrix materials. This allows optimization of both magnetic performance and manufacturability, as the composite structure can be tailored to specific application requirements while being fabricated using established manufacturing processes.
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 device achieves high-efficiency separation of magnetic molecular entities by utilizing a ferromagnetic auxiliary structure to create a strong magnetic field gradient, effectively enriching and diluting magnetic ions and molecules while maintaining a cost-efficient design.
Implementation Method 1
under the influence of the magnetic field gradient in an inhomogeneous magnetic field, paramagnetic and ferromagnetic particles move into the direction of higher field strength
Implementation Method 2
a ferromagnetic auxiliary structure that distorts the external magnetic field, creating a strong gradient for efficient separation
Implementation Method 3
minimizing turbulence and re-mixing through a laminar flow design
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3B
AI summary
A microfluidic device (500) includes a substrate (100) with a fluid channel (250) extending from an inlet opening (210) to a channel branch (270). The fluid channel (250) includes a planar spiral portion (255) and at the channel branch (270) the fluid channel (250) branches in at least two outlet channels (280). A ferromagnetic auxiliary structure (300) is formed in a plane parallel to the planar spiral portion (255).