3D Printed Microfluidic Membrane for Radionuclide Separation
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Solution Overview
Problem
Current methods for radionuclide separation and purification, such as ion exchange chromatography and microscale flow-through liquid-liquid extraction, face limitations in minimum sample size, loading capacity, and performance degradation with high interfering metal ions and high flow rates, while multistage membrane extraction has not been demonstrated for laboratory-scale separations or medical radioisotope production.
Innovation Solution
A 3D printed microfluidic apparatus with a modular membrane extraction system using porous membrane filters to stabilize the liquid-liquid interface under varying flow conditions, allowing for efficient extraction and transfer of components between phases, enabling multistage operations with reduced pump requirements and flexible configuration for series or parallel setups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If column chromatography is used for radionuclide separation, then versatility and ease of operation are improved, but minimum sample size and loading capacity are limited
Solution Approach 1:
The patent applies hydraulic principles by using liquid-liquid extraction with immiscible phases flowing through a controlled interface. The system uses flow rate control and phase density differences to achieve separation, replacing the solid-phase chromatography mechanism with a fluid-based extraction mechanism that provides higher loading capacity while maintaining operational simplicity.
2Reliability
If chromatographic separation is used, then separation capability is improved, but performance degrades with high interfering metal ions and high flow rates
Solution Approach 1:
The patent changes the separation mechanism from adsorption-based chromatography to solubility-based liquid-liquid extraction. This parameter change allows the system to maintain high separation performance under varying flow rates and in the presence of interfering metal ions, as the extraction process is less sensitive to flow dynamics and more dependent on chemical equilibrium between phases.
3Productivity
If droplet extraction is used for microscale separation, then extraction efficiency is improved, but device complexity increases for multistage operations
Solution Approach 1:
The patent segments the extraction process into distinct flow paths for feed and extract phases, allowing multistage extraction to be achieved by simply connecting multiple identical modules in series. Each module performs a single extraction stage, and the modular design reduces overall device complexity compared to integrated droplet extraction systems requiring multiple pumps and complex flow control.
4Stability of the object's composition
If parallel flow extraction is used, then interface stability is improved, but flow condition control becomes more difficult
Solution Approach 1:
The patent employs a disposable microfluidic chip design where the extraction interface is formed within a fixed geometric structure. This eliminates the need for complex flow control to maintain interface stability, as the chip geometry itself defines the flow paths and interface configuration. The disposable nature allows easy replacement rather than complex adjustment.
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 apparatus achieves stable interface stability under varying flow conditions, reduces hazardous material usage, and enables efficient multistage extraction with high selectivity, making it suitable for laboratory-scale radionuclide separations and medical radioisotope production.
Implementation Method 1
membrane extraction offers attractive alternative microscale liquid-liquid extraction geometry
Implementation Method 2
The membrane filter operates to extract the component from the first liquid and to transfer the component into the second liquid
Data Source
AI summary
The present disclosure relates to a membrane extraction apparatus for extracting a component from a first liquid. The apparatus may incorporate a housing comprised of first and second mating housing halves, with each housing half having an open faced channel formed therein such that the channels at least partially overlay one another when the two housing halves are secured together. A membrane filter is disposed between the two housing halves to overlay the open faced channels. The membrane filter extracts the component from the first liquid and transfers the component into the second liquid as the first and second liquids flow through the first and second housing halves.