Wireless Nanoscale Electrode Array for Low-Voltage Particle Trapping
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Solution Overview
Problem
Dielectrophoresis typically requires high voltages for particle manipulation and sensitive impedance measurements, which can be cumbersome and costly, and existing technologies struggle with efficient low-power manipulation of particles in liquid or gaseous media.
Innovation Solution
A wireless circuit with a nanoscale electrode array and inductive coupler enables low-power manipulation of particles using resonant inductive coupling, allowing for efficient dielectrophoretic force generation and impedance sensing with sub-volt signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage is used for particle manipulation via dielectrophoresis, then particle trapping and positioning effectiveness is improved, but power consumption increases and device complexity increases
Solution Approach 1:
The electrode structure is segmented into interdigitated finger electrodes that create localized high-field regions at the gaps between fingers. This segmentation allows concentrated dielectrophoretic forces at specific locations without requiring high voltage across the entire electrode structure, thereby reducing overall power consumption while maintaining effective particle trapping.
Solution Approach 2:
The patent creates local high electric field regions at the nanoscale gaps between interdigitated electrode fingers rather than requiring uniform high fields across the entire device. This local concentration of electric field strength enables effective particle manipulation with lower overall voltage, reducing power consumption while maintaining trapping effectiveness.
2Force
If high voltage is used for particle manipulation, then dielectrophoretic force strength is improved, but device complexity and cost increase
Solution Approach 1:
The interdigitated electrode geometry segments the electric field into multiple localized regions at the finger gaps. Each gap acts as an independent high-field zone, generating strong dielectrophoretic forces locally without requiring the entire system to operate at high voltage, thereby simplifying the voltage generation requirements.
Solution Approach 2:
The patent changes the geometric parameters of the electrode structure to nanoscale dimensions, specifically the gap width between fingers. This dimensional parameter change concentrates the electric field strength at the nanoscale gaps, generating sufficient dielectrophoretic force with lower applied voltages, thus reducing device complexity.
3Ease of manufacture
If traditional electrode spacing is used, then manufacturing is simpler, but electric field strength for particle manipulation is insufficient
Solution Approach 1:
The patent modifies the spacing parameter between electrodes to the nanoscale range (1-100 nm gaps between interdigitated fingers). This parameter change dramatically increases electric field strength at the gaps according to the relationship E≈V/d, where smaller d yields larger E. Standard semiconductor fabrication techniques can achieve these dimensions, maintaining ease of manufacture while vastly improving field strength.
Solution Approach 2:
The patent transitions from planar electrode spacing to vertically stacked interdigitated layers, creating three-dimensional electric field configurations. This dimensional change allows field concentration at multiple levels and surfaces, increasing overall electric field strength and particle manipulation capability without complicating the fundamental fabrication process.
4Reliability
If large voltage signals are used for particle collection, then particle trapping is more effective, but impedance measurement sensitivity decreases
Solution Approach 1:
The interdigitated electrode structure segments the function into distinct regions: the finger gaps generate strong localized fields for effective particle collection, while the overall electrode geometry maintains suitable impedance characteristics for sensitive measurements. This segmentation allows simultaneous optimization of both trapping effectiveness and measurement sensitivity.
Solution Approach 2:
Strong electric fields are localized to the narrow gaps between finger electrodes for effective particle trapping, while the broader electrode structure presents a moderate overall impedance suitable for sensitive measurements. This local concentration of field strength allows effective particle collection without requiring large voltage signals across the entire device, preserving impedance measurement sensitivity.
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 approach allows for efficient trapping and detection of particles at lower voltages, increasing sensitivity and reducing power consumption, enabling broader applications in biosensing and diagnostics.
Implementation Method 1
Stable capacitance for resonant inductive coupling may be obtained, which may be used to power the dielectrophoretic device via wireless power transfer (WPT)
Implementation Method 2
Dielectrophoresis is a phenomenon by which a force is exerted on a particle when the particle is subjected to a non-uniform electric field
Data Source
AI summary
A wireless circuit including an electrode array with a nanoscale dielectric disposed between two electrodes allows for wirelessly powered manipulation of particles in a liquid solution, air, or gaseous media via dielectrophoretic forces. The electrode array includes a first electrode, a second electrode, and a nanoscale dielectric layer between the first and second electrode. An inductive coupler is operatively coupled to the electrode array and configured to receive wireless power or wireless signals.