Dielectrophoretic Particle Concentrator With 3D Protrudent Structure
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Solution Overview
Problem
Current dielectrophoretic particle concentrators are inefficient in concentrating trace particles in specimen fluids, such as in water quality, blood, and urine tests, due to limitations in generating effective dielectrophoresis forces for particle separation and concentration.
Innovation Solution
A 3-D dielectrophoretic particle concentrator with a protrudent structure and edge wall structures forming a pipe-like structure, where an electrical field is compressed to produce a dielectrophoresis force, concentrating particles at a line-like gate within a fluid pipe, and employing detection electrodes for efficient particle detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a flat-plate electrode and localized electrode are used to generate a non-uniformed electrical field, then dielectrophoresis force is produced to concentrate particles, but the particle concentration efficiency is insufficient
Solution Approach 1:
The patent transitions from a conventional 2D planar electrode configuration to a 3D microfluidic structure with protrudent structures. The electrical field is applied in three dimensions through the microfluidic channels, creating enhanced field gradients that significantly improve particle concentration efficiency while maintaining reliable separation performance.
Solution Approach 2:
The patent introduces protrudent structures with specific geometric characteristics (height, width, spacing) to create localized regions of enhanced electrical field gradient. These local structural modifications concentrate the electrical field strength at specific locations, thereby enhancing dielectrophoresis force and particle concentration efficiency in critical regions while maintaining overall system reliability.
2Measurement precision
If trace particles are concentrated using conventional dielectrophoresis mechanisms, then particle detection becomes possible, but the detection sensitivity remains insufficient for trace particles
Solution Approach 1:
The patent divides the microfluidic channel into multiple segments with protrudent structures at different positions. Each segment creates localized electrical field gradients that independently contribute to particle concentration. This segmentation approach accumulates concentration effects along the flow path, significantly enhancing detection sensitivity for trace particles while maintaining efficient concentration productivity.
Solution Approach 2:
The patent employs nested protrudent structures within the microfluidic channel, where smaller protrudent elements are positioned within larger channel structures. This nested configuration creates multiple concentric electrical field gradients that work synergistically to concentrate particles, thereby enhancing detection sensitivity without compromising concentration efficiency.
3Productivity
If a complex 3-D dielectrophoretic structure is implemented, then particle concentration efficiency improves, but device complexity increases
Solution Approach 1:
The patent optimizes specific geometric parameters of the protrudent structures (height, width, spacing, material properties) to achieve enhanced particle concentration efficiency. By carefully selecting and tuning these parameters, the system achieves high productivity while keeping the overall device complexity manageable through standardized design rules and fabrication 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 solution enhances particle concentration efficiency by creating a strong dielectrophoresis force within the fluid pipe structure, allowing for effective separation and detection of particles, improving the detection process in liquid specimen tests.
Implementation Method 1
an electrical field is compressed to produce a dielectrophoresis force, concentrating particles at a line-like gate within a fluid pipe
Data Source
AI summary
A dielectrophoretic particle concentrator includes first substrate, detection electrodes, second substrate, protrudent structure and edge wall structures. The first substrate extends along first direction. The detection electrodes are disposed on the first substrate and extend along second direction. The second direction crosses the first direction. The second substrate is disposed over the first substrate and extends along the first direction. The protrudent structure is disposed on the second substrate and protruded towards the first substrate. A top portion of the protrudent structure includes a line-like structure extending along the second direction and adjacent to the detection electrodes. The edge wall structures are integrated with the first substrate and the second substrate, to form pipe-like structure to enable a fluid flowing through the protrudent structure from an end to another end. The particle concentration can trap particles at the gap by continuously trap mode or bidirectional trap mode with changing frequency.