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首页> 外文期刊>Lab on a chip >Large-scale production of compound bubbles using parallelized microfluidics for efficient extraction of metal ions
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Large-scale production of compound bubbles using parallelized microfluidics for efficient extraction of metal ions

机译：使用并行微流体的复合气泡大规模生产，以有效提取金属离子

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Recent advances in microfluidic technologies have enabled production of micro-scale compound bubbles that consist of gaseous cores surrounded by thin liquid shells, achieving control and uniformity not possible using conventional techniques. These compound bubbles have demonstrated enormous utility as functional materials for drug delivery, as ultra-lightweight structural materials, as engineered acoustic materials, and also as separating agents for extraction of metal ions from waste fluid streams. Despite these successful demonstrations, compound bubbles have largely remained at the laboratory-scale due to the slow production rates endemic to microfluidics (10 mL h(-1)). Although parallelization approaches have enabled large-scale production of simple emulsions and bubbles, its application to the production of higher order dispersions such as compound bubbles has been limited because the optimal processing window for the production of uniform compound bubbles is relatively narrow and the required channel geometry is quite complex. In this report, we demonstrate the parallelization of multi-stage flow focusing droplet generators that produce compound ternary bubbles. We parallelize 400 multi-stage FFG devices, generating up to 3 L (approximate to 10(11) bubbles) of monodispersed (CV 5%) compound bubbles in less than 1 hour. We show that it is critical to use multi-height channels and operate each individual generator in a flow regime that is minimally sensitive to variations in the flow rate to reliably produce uniform compound bubbles. To demonstrate the utility of our parallelized device, we take advantage of the buoyancy and the high mass transfer rate that comes from the thin shells of gas-in-oil-in-water compound bubbles to rapidly extract Nd ions from a model waste stream.
机译：微流体技术的最新进展使得能够产生微级复合气泡，该气泡由薄液体壳包围的气态核心，使用常规技术不可能实现控制和均匀性。这些复合气泡已经表现为用于药物递送的功能材料的巨大用途，作为超轻的结构材料，作为工程学声学材料，以及作为从废液流中提取金属离​​子的分离剂。尽管有这些成功的示威性，但由于对微流体的慢的生产率（＆ 10ml（-1）），复合泡沫很大程度上保持在实验室规模。虽然并行化方法使得具有大规模生产简单的乳液和气泡，但其在诸如复合气泡的高阶分散体的生产中的应用受到限制，因为用于生产均匀化合物气泡的最佳加工窗口相对较窄，所需的通道几何非常复杂。在本报告中，我们展示了产生复合三元气泡的多级流动聚焦液滴发生器的并行化。我们将400个多级FFG器件平行化，产生最多3L（近似为10（11）个气泡）的单分散（CV 5％）复合气泡在不到1小时内。我们表明，使用多高通道并在流动状态下操作对流速的变化来可靠地产生均匀的复合气泡的流动状态是至关重要的。为了证明我们并行化装置的效用，我们利用浮力和来自水包内复合气泡的薄壳的浮力和高传质速率，从模型废物流快速提取Nd离子。

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