Nanoscale Channel Array for Isotope Separation
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Solution Overview
Problem
Conventional capillary zone electrophoresis (CZE) devices are large, power-intensive, and not portable, making them inefficient for separating and detecting isotopes of the same element due to their long separation tubes and high power supply requirements, which limits their miniaturization and portability.
Innovation Solution
A miniaturized electrophoretic device with an array of aligned hollow channels in a porous substrate, where analytes are preconcentrated, electrodissolved, and separated through a controlled electrophoresis electric field, allowing for efficient separation and detection of ionized species, including isotopes, using a significantly reduced channel length and lower power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional CZE devices use long separation tubes (≥50 cm) and high voltage power supplies (10's of kV), then sufficient electric field strength is achieved for isotope separation, but device size and power consumption increase significantly
Solution Approach 1:
The patent divides the separation function into multiple parallel nanoscale channels (1-100 nm diameter) within a compact substrate, replacing the single long capillary tube. This segmentation allows achieving sufficient separation resolution through parallel processing while dramatically reducing the overall device footprint from tens of centimeters to millimeters or micrometers.
Solution Approach 2:
The patent transitions from one-dimensional separation in a single capillary tube to two-dimensional or three-dimensional arrays of nanoscale channels. This dimensional change enables parallel separation pathways, achieving the required separation resolution through increased channel density rather than increased channel length, thus miniaturizing the device.
2Measurement precision
If conventional CZE devices use long separation tubes and high voltage power supplies, then isotope separation is achieved, but power consumption increases making the device non-portable
Solution Approach 1:
The patent changes the physical parameters of the separation system by using nanoscale channel dimensions (1-100 nm) instead of conventional capillary dimensions (50-100 μm). This parameter change enables achieving sufficient electric field strength with much lower voltages due to the shortened separation distance, while the nanoscale confinement enhances separation efficiency through increased surface-to-volume ratio and modified electroosmotic flow characteristics.
3Measurement precision
If conventional CZE uses separation tubes with length-to-diameter ratio of 5,333:1, then ultrahigh resolution is obtained, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs porous substrates with regularly spaced nanoscale channels as the separation medium. This porous structure provides multiple parallel separation pathways with controlled pore sizes (1-100 nm), achieving high resolution through the collective effect of numerous short channels rather than a single long channel, thereby dramatically reducing the aspect ratio from 5,333:1 to much lower values.
Solution Approach 2:
The patent utilizes electroosmotic flow generated by applying a voltage across the porous substrate to drive ion migration through the nanoscale channels. The electric field induces movement of ions along with the electroosmotic flow, enabling separation over the short channel length while maintaining high resolution through the combined effect of electrophoresis and electroosmosis.
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 device achieves rapid and efficient separation of isotopes with a 10,000× reduction in CZE tube length, enabling temporal separation in seconds compared to tens-of-minutes for conventional CZE, while being inexpensive, miniaturized, and portable.
Implementation Method 1
a means for applying an electrophoresis electric field between the entrance and the exit of the array of aligned hollow channels
Implementation Method 2
The preconcentrating step can comprise electrochemical plating, electrochemical adsorption, chemical adsorption, or physical deposition of the analyte on the injection electrode
Implementation Method 3
electrodissolution of the analyte from the injection electrode to provide ionized species in a solvent
Data Source
AI summary
This invention is directed to an inexpensive, miniaturized, portable, low-power device and method for electrophoretic separation and electrochemical detection of an analyte, including different isotopes of the same element. The invention replaces a conventional or microfabricated capillary electrophoresis tube with a microchip comprising an array of parallel electrophoretic separation nanotubes or aligned hollow channels fabricated in a porous substrate.