Single Liquid Aerosol Microparticle Electrochemistry on a Suspended Ionic Liquid Film
Single Liquid Aerosol Microparticle Electrochemistry on a Suspended Ionic Liquid Film
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悬浮离子液体膜上的单液体气溶胶微粒电化学
DOI：
10.1002/smll.202308637
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发表时间：
2024
期刊：
影响因子：
13.3
通讯作者：
Dick, Jeffrey E.
中科院分区：
文献类型：
--
作者：
Krushinski, Lynn E.;Vannoy, Kathryn J.;Dick, Jeffrey E.
液体气溶胶在自然界中普遍存在，并且存在几种工具来量化其物理化学性质。电化学作为一种测量科学技术，在气溶胶分析中的应用并不多，因为空气中的电化学比较困难。在这里，一个非常简单的方法被证明捕获和电分析单个液体气溶胶粒子的半径上的顺序为单微米。电化学电池由穿过悬浮在线环（参比/对电极）内的离子液体（1-丁基-1-甲基吡咯烷鎓双（三氟甲基磺酰基）酰亚胺）膜的微丝（圆柱形工作电极）构成。选择离子液体是因为低蒸汽压使膜保持数周，大大改善了悬浮膜电分析。所得的高表面积允许悬浮的离子液体单元充当气溶胶网。考虑到离子液体的疏水性质，水性气溶胶颗粒不会聚结到膜中。当液体气溶胶与充分偏置的微丝碰撞时（产生复杂的边界：气溶胶），|线|离子液体|空气），可以真实的实时询问单个液体气溶胶颗粒内的电化学。证明了实现半径超过1 µm的气溶胶的液体气溶胶粒径分布的能力。
Liquid aerosols are ubiquitous in nature, and several tools exist to quantify their physicochemical properties. As a measurement science technique, electrochemistry has not played a large role in aerosol analysis because electrochemistry in air is rather difficult. Here, a remarkably simple method is demonstrated to capture and electroanalyze single liquid aerosol particles with radii on the order of single micrometers. An electrochemical cell is constructed by a microwire (cylindrical working electrode) traversing a film of ionic liquid (1‐butyl‐1‐methylpyrrolidinium bis(trifluoromethylsulfonyl)imide) that is suspended within a wire loop (reference/counter electrode). An ionic liquid is chosen because the low vapor pressure preserves the film over weeks, vastly improving suspended film electroanalysis. The resultant high surface area allows the suspended ionic liquid cell to act as an aerosol net. Given the hydrophobic nature of the ionic liquid, aqueous aerosol particles do not coalesce into the film. When the liquid aerosols collide with the sufficiently biased microwire (creating a complex boundary: aerosol|wire|ionic liquid|air), the electrochemistry within a single liquid aerosol particle can be interrogated in real‐time. The ability to achieve liquid aerosol size distributions for aerosols over 1 µm in radius is demonstrated.