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Microfluidic Devices for radionuclide separations

This article describes a technique for microliter-scale radionuclid] separations and purifications using a continuous-flow [[microfluidic device. Radionuclide separations are currently carried out via ion exchange or extraction chromatography, which require large elution volumes and involve lengthy, multi-step processes. The authors describe a promising alternative to such conventional methods: a customizable microfluidic flat-sheet microfluidic support liquid membrane (FS-SLM) fabricated using a commercially available resin 3D printer. The devices are low-cost (less than 5 USD), can be rapidly prepared, require much smaller reagent volumes, and simplify separations by combining the extraction and stripping steps. To test separation performance, the authors fabricated modules with varying channel depths (100, 200, 300, and 400 μm) and measured uranium-233 transport across a 15 v/v% tributyl phosphate (TBP) liquid membrane at varying flow rates (between 5 and 60 μL min−1). Uranium transport was modelled using a 2D numerical transport model. It was found that the shallowest channel was the most effective for uranium extraction, and that extraction increased with decreasing flow rate and channel depth and increasing channel residence time. Moreover, the FS-SLM modules effectively increased the concentration of the extracted uranium.

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