2D Material Electrodes for Low-Voltage Dielectrophoresis
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Solution Overview
Problem
Existing dielectrophoresis (DEP) techniques require high voltages to manipulate particles, leading to heat generation and potential adverse effects on biological cells or molecules, and lack efficient methods for low-power, portable particle manipulation and sorting.
Innovation Solution
The use of electrodes formed from two-dimensional (2D) materials, such as graphene, to create high electric field gradients at lower voltages, enabling effective DEP manipulation of particles with reduced heat generation and allowing for low-power, portable devices capable of trapping and sorting particles without damaging them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional electrodes are used for dielectrophoresis, then particles can be manipulated, but high voltages are required causing heat generation and potential damage to biological cells or molecules
Solution Approach 1:
The patent changes the geometric parameters of the electrodes by transitioning from conventional three-dimensional structures to two-dimensional material electrodes with atomically sharp edges. This parameter change concentrates the electric field at the edges, creating high field gradients at much lower voltages, thereby reducing heat generation while maintaining particle manipulation capability
Solution Approach 2:
The patent applies dimensionality change by using two-dimensional materials (such as graphene) instead of conventional three-dimensional electrodes. The 2D material electrodes with atomically sharp edges create concentrated electric field gradients at their boundaries, enabling effective dielectrophoresis at significantly lower voltages and reducing thermal effects
2Productivity
If high voltages are applied to manipulate particles, then DEP manipulation is effective, but unwanted chemical reactions occur and biological samples are damaged
Solution Approach 1:
The patent changes the voltage parameter by using 2D material electrodes that generate sufficient electric field gradients at low voltages. This parameter change eliminates the need for high voltages, thereby preventing unwanted chemical reactions and biological damage while maintaining effective particle manipulation
Solution Approach 2:
The patent converts the potential harm of high voltage into a benefit by using 2D material edges to concentrate electric fields. The atomically sharp edges of 2D materials naturally concentrate the electric field, creating strong DEP forces at low voltages, thus transforming what would be a harmful high-voltage situation into a beneficial low-voltage operation
3Power
If electrodes are spaced far apart to avoid charge buildup, then charge buildup is reduced, but electric field gradient is insufficient for effective DEP
Solution Approach 1:
The patent applies local quality by concentrating the electric field at the atomically sharp edges of the 2D material electrodes. Instead of requiring close spacing throughout the entire electrode area, the sharp edges create localized high field gradients that are sufficient for effective DEP while maintaining manageable charge distribution
Solution Approach 2:
The patent uses two-dimensional material electrodes with atomically sharp edges that create concentrated electric field gradients at their boundaries. This dimensional approach allows effective DEP with moderate electrode spacing by leveraging the edge effects of 2D materials rather than relying on close spacing
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 enables DEP manipulation of particles at significantly lower voltages, reducing heat generation and allowing for dense integration of electrodes, effective manipulation of biological cells or molecules, and the development of portable bio-sensing devices without causing unwanted chemical reactions.
Implementation Method 1
Dielectrophoresis (DEP) is a technique for manipulating molecules or other polarizable objects (e.g., nanoscale or microscale objects) by using gradient electrical forces obtained from a voltage applied between electrodes
Implementation Method 2
application of a sufficient voltage across the first and second electrode generates an electric field in at least part of channel, the electric field having an electric field gradient sufficient to apply the dielectrophoretic force on the particle
Data Source
AI summary
Devices, systems, and methods for applying a dielectrophoretic force on a particle include: a cell defining at least one channel for confining the particle; and a first electrode and a second electrode electrically isolated from the first electrode, at least one of the first and second electrodes being formed from a two-dimensional (2D) material providing an atomically sharp edge. The first and second electrodes are arranged sufficiently close to one another and sufficiently close to the channel such that application of a sufficient voltage across the first and second electrodes generates an electric field in at least part of the channel, the electric field having an electric field gradient sufficient to apply the dielectrophoretic force on the particle in the channel.