Separation Chip Electrode Gradients for Variable Particle Capture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing separation chips face challenges in maintaining a high capture rate of dielectric particles due to variations in cell characteristics such as size and dielectric constant, leading to incomplete capture and reduced efficiency.
Innovation Solution
The separation chip design includes electrode portions with varying cross-sectional shapes, dimensions, and materials along the flow direction, along with insulation layers, to create differential electric field gradients, ensuring effective capture of dielectric particles by adjusting the electric field intensity along the flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform comb-shaped electrodes are used for dielectrophoresis separation, then the device structure is simple and easy to manufacture, but the capture rate of dielectric particles decreases due to inability to accommodate variations in particle characteristics
Solution Approach 1:
The patent applies local quality by making each electrode portion have different characteristics (different electrode widths, different insulation layer thicknesses, different materials) tailored to capture specific types of dielectric particles. This allows the device to accommodate variations in particle characteristics while maintaining a relatively simple overall device structure.
Solution Approach 2:
The patent segments the electrode structure into multiple electrode portions (first electrode portion, second electrode portion, etc.) with different characteristics. Each segment can be optimized for capturing particles with specific properties, thereby improving the overall capture rate while keeping the manufacturing process manageable through modular design.
2Reliability
If electrode characteristics are varied to capture different particle types, then the capture rate improves, but the device complexity increases
Solution Approach 1:
The patent implements local quality by varying electrode characteristics only in specific regions where different particle types need to be captured. Not all electrode portions need to be different - only those interacting with specific particle populations require customized characteristics, thereby limiting the increase in device complexity to necessary areas only.
Solution Approach 2:
The patent creates multi-functionality by designing electrode portions that can handle multiple particle types through combinations of different characteristics. A single electrode portion with specific width and insulation layer properties can be optimized for multiple capture scenarios, reducing the total number of different electrode types needed and thereby limiting complexity increase.
3Strength
If insulation layer thickness is increased to protect electrodes, then electrode protection improves, but the electric field gradient decreases reducing capture efficiency
Solution Approach 1:
The patent applies local quality by varying insulation layer thickness across different electrode portions. Thinner insulation layers are used in regions where strong electric field gradients are needed for efficient capture, while thicker insulation layers are used in regions where electrode protection is prioritized. This localized optimization balances protection and efficiency.
Solution Approach 2:
The patent changes the insulation layer thickness parameter across different electrode portions to optimize the balance between electrode protection and electric field gradient generation. By adjusting this physical parameter locally, the system achieves both adequate protection and sufficient capture efficiency without requiring a uniform design throughout.
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 design enhances the capture rate of dielectric particles by accommodating variations in particle characteristics, preventing incomplete capture and potential damage, while maintaining efficiency.
Implementation Method 1
a dielectrophoresis (DEP) unit that realizes separation and recovery of cells and the like by dielectrophoresis
Data Source
AI summary
A separation chip includes a substrate and a plurality of electrode portions. The plurality of electrode portions are disposed on one-side surface of the substrate, and each of the electrode portions has at least an electrode, and extends in the first direction. The plurality of electrode portions are disposed adjacent to each other in the second direction intersecting the first direction. A channel through which a liquid containing dielectric particles is to flow in a flow direction intersecting the first direction is provided on one side of the plurality of electrode portions. At least one electrode portion and another electrode portion are different from each other in at least one of a cross-sectional shape along the second direction, a dimension in a cross section along the second direction, and a material.