反应飞秒液滴中氢微泡的生长速率
Growth Rates of Hydrogen Microbubbles in Reacting Femtoliter Droplets
摘要：
小液滴中的化学反应被广泛探索，以加速新材料的发现，提高催化两相转化和高通量分析的效率和特异性。在这项工作中，我们调查的本地速率的气体演化反应内固定在固体表面上的毫微微升液滴。通过高分辨率共聚焦显微图像在线测量反应产生的氢气微泡（半径> 500 nm）的生长速率。气泡的生长速度在较小的液滴中较快，在同一液滴中靠近三相边界的气泡生长速度较快。对于纯液滴和二元反应液滴以及不同润湿性的基底，结果是一致的。我们的理论分析的基础上的扩散，化学反应，和气泡生长在一个稳定的状态下预测，从周围扩散的反应物的浓度取决于液滴的大小和气泡的位置内的液滴，在良好的协议与实验结果。我们的研究结果表明，反应速率可能是空间不均匀的反应微滴。这些发现可能对制定这些液滴的化学性质和用途有影响。
英文摘要：
Chemical reactions in small droplets are extensively explored to accelerate the discovery of new materials, increase efficiency and specificity in catalytic biphasic conversion and in high throughput analytics. In this work, we investigate the local rate of gas-evolution reaction within femtoliter droplets immobilized on a solid surface. The growth rate of hydrogen microbubbles (> 500 nm in radius) produced from the reaction was measured online by high-resolution confocal microscopic images. The growth rate of bubbles was faster in smaller droplets, and of bubbles near the three-phase boundary in the same droplet. The results were consistent for both pure and binary reacting droplets and on substrates of different wettability. Our theoretical analysis based on diffusion, chemical reaction, and bubble growth in a steady state predicted that the concentration of the reactant diffusing from the surrounding depended on the droplet size and the bubble location inside the droplet, in good agreement with experimental results. Our results reveal that the reaction rate may be spatially non-uniform in the reacting microdroplets. The findings may have implications for formulating chemical properties and uses of these droplets.
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