DEP Separator Cross-Over Frequency Measurement With Tracking
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Solution Overview
Problem
Existing dielectrophoresis (DEP) separators face inefficiencies due to particles touching planar electrodes, leading to additional attractive forces and non-uniform electrical fields, which affect the separation of particles.
Innovation Solution
The DEP separator apparatus features electrodes along the walls of microfluidic channels, generating a uniform electrical field, and a controller that automatically measures and sets the cross-over frequency for optimal particle separation based on dielectrophoretic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If planar electrodes are used in DEP separator, then particle separation can be performed, but particles touch electrodes causing additional attractive forces and non-uniform electrical fields
Solution Approach 1:
The patent transitions from planar electrodes to three-dimensional electrode structures (such as interdigitated electrodes or electrodes positioned at different heights) to create more uniform electrical fields. This dimensional change allows the electric field to be distributed more evenly throughout the fluid channel, eliminating the non-uniformity caused by particle contact with flat electrode surfaces.
Solution Approach 2:
The patent introduces a dielectric coating or insulating layer between the particles and electrodes as an intermediary. This layer prevents direct contact between particles and electrodes, eliminating the harmful van der Waals forces and additional attractive forces while maintaining the dielectrophoretic separation effect through the electrical field.
2Measurement precision
If cross-over frequency is not accurately determined, then separation precision decreases, but automatic measurement and setting systems increase device complexity
Solution Approach 1:
The patent implements an automatic measurement and setting system that self-calibrates the cross-over frequency by analyzing particle behavior in real-time. The system automatically adjusts operating parameters based on measured particle properties, eliminating the need for manual calibration and reducing operational complexity despite the sophisticated measurement capabilities.
Solution Approach 2:
The patent incorporates feedback mechanisms where particle separation performance is continuously monitored and used to automatically adjust the applied frequency. This closed-loop control system ensures optimal separation by dynamically adapting to variations in particle properties and environmental conditions, achieving high precision without requiring complex manual intervention.
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 improves particle separation efficiency by accurately determining and applying the cross-over frequency, allowing for precise separation of cells or particles without overlapping distribution curves, enhancing the separation process.
Implementation Method 1
apply a frequency through electrodes of a dielectrophoresis (DEP) separator to generate an electrical field in the DEP separator that affects movement of a cell in a buffer based on dielectrophoretic properties of the cell and the buffer
Data Source
AI summary
In example implementations, an apparatus is provided. The apparatus includes a dielectrophoresis (DEP) separator, an electrical field generator, a tracking system, and a controller. The DEP separator is to separate a plurality of different particles. The electrical field generator is coupled to the DEP separator to apply a frequency to the DEP separator. The tracking system is to track a movement of a type of particles in the DEP separator. The controller is in communication with the electrical field generator to control the frequency and the tracking system to track the separation. The controller is to calculate a cross-over frequency from a cross-over frequency distribution for the type of particles based on a frequency sweep performed on the type of particles and the movement of the type of particles that is tracked.