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In Situ Monitoring of Collision and Recollision Events of Single Attoliter Droplets via Single-Entity Electrochemistry
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-11-19 , DOI: 10.1021/acs.jpclett.0c02723 Heekyung Park 1 , Jun Hui Park 1
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2020-11-19 , DOI: 10.1021/acs.jpclett.0c02723 Heekyung Park 1 , Jun Hui Park 1
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We describe a simple method for real-time observation of collision and recollision behavior of a single aqueous attoliter droplet in an organic solvent through single-entity electrochemistry. The dynamics and morphology of the droplet after the collision event at the Au ultramicroelectrode (Au-UME) were monitored by consecutive cyclic voltammetry and amperometric current–time measurements. By sequentially applying oxidative potential and reductive potential at the Au-UME in the presence of attoliter droplets containing reversible redox species (e.g., ferrocyanide), we successfully detected the oxidative collision spike and its reductive recollision spike successively owing to the reversible redox reactions inside the droplet. Because the redox species was dissolved in a reduced form, the reductive collision spikes observed are the direct evidence that the water droplets colliding at the electrode surface are detached after the oxidation reaction. The collided droplet properties, such as size change and contact area, are also investigated and discussed.
中文翻译：
通过单实体电化学原位监测单个Attoliter液滴的碰撞和再碰撞事件
我们描述了一种简单的方法，用于通过单实体电化学实时观察有机溶剂中单个Atto升水液滴的碰撞和再碰撞行为。在金超微电极（Au-UME）上发生碰撞事件之后，液滴的动力学和形态通过连续循环伏安法和安培电流-时间测量法进行监测。通过在包含可逆氧化还原物质（例如亚铁氰化物）的attoliter小滴存在下，在Au-UME上顺序施加氧化电位和还原电位，我们成功地检测到了氧化碰撞尖峰及其还原性碰撞碰撞尖峰，这是由于内部发生了可逆的氧化还原反应水滴。由于氧化还原物质以还原形式溶解，观察到的还原性碰撞峰值是氧化反应后水滴在电极表面碰撞的直接证据。还对碰撞的液滴特性（例如大小变化和接触面积）进行了研究和讨论。
更新日期：2020-12-03
中文翻译：
通过单实体电化学原位监测单个Attoliter液滴的碰撞和再碰撞事件
我们描述了一种简单的方法，用于通过单实体电化学实时观察有机溶剂中单个Atto升水液滴的碰撞和再碰撞行为。在金超微电极（Au-UME）上发生碰撞事件之后，液滴的动力学和形态通过连续循环伏安法和安培电流-时间测量法进行监测。通过在包含可逆氧化还原物质（例如亚铁氰化物）的attoliter小滴存在下，在Au-UME上顺序施加氧化电位和还原电位，我们成功地检测到了氧化碰撞尖峰及其还原性碰撞碰撞尖峰，这是由于内部发生了可逆的氧化还原反应水滴。由于氧化还原物质以还原形式溶解，观察到的还原性碰撞峰值是氧化反应后水滴在电极表面碰撞的直接证据。还对碰撞的液滴特性（例如大小变化和接触面积）进行了研究和讨论。
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