Witnessing a discrete microdroplet freezing event via real-time electrochemical monitoring of solution temperature†

IF 3.6 3区 化学 Q2 CHEMISTRY, ANALYTICAL
Analyst Pub Date : 2024-12-04 DOI:10.1039/D4AN01200C
Philip J. Kauffmann, Cristian A. Blanco-Combariza and Jeffrey E. Dick
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Abstract

Temperature monitoring has immediate relevance to many areas of research, from atmospheric environmental studies to biological sample and food preservation to chemical reactions. Here, we use a triple-barrel electrode to provide temperature readouts in bulk solution and microdroplets, as well as electrochemically monitor freezing events in a microdroplet. Using this method, we are able to identify distinct characteristics of a freezing aqueous droplet (supercooling, ice formation beginning and end, temperature change, and thawing) with greater temporal resolution than a standard thermocouple and without the use of microscopy. By correlating the amperometric signal change caused by alterations in the diffusion coefficient of the electrochemical system in response to temperature changes, we can calculate the instantaneous temperature at our electrode, as well as the physical behavior of ice formation and expansion. Our results suggest that these electrochemical techniques can provide real-time monitoring of the physical processes involved in aqueous temperature change and ice nucleation events. Here, we employ a novel technique using triple-barrel electrodes to provide temperature readouts in bulk solution and microdroplets, as well as electrochemically monitor freezing events in a microdroplet. Because ice nucleation spans many research fields, it is important to have a variety of tools that can be used to better understand these frozen systems. Our data shows that electrochemistry can provide real-time information on the thermal properties of aqueous environments, and these types of measurements can be extended to microdroplets. The electrochemical signal details all the significant moments in a droplet freezing event, allowing us to use electrochemistry as a stand-alone tool for monitoring freezing events with excellent temporal and spatial resolution.

Abstract Image

通过实时电化学监测溶液温度见证离散微液滴冻结事件
温度监测与许多领域的研究直接相关,从大气环境研究到生物样品和食品保存到化学反应。在这里,我们使用一种新建立的三桶电极来提供散装溶液和微滴的温度读数,以及电化学监测微滴中的冻结事件。使用这种方法,我们能够以比标准热电偶更大的时间分辨率识别冷冻液滴的不同特征(过冷,冰形成的开始和结束,温度变化和融化),而无需使用显微镜。通过将电化学系统的扩散系数随温度变化引起的电流信号变化联系起来,我们可以计算出电极处的瞬时温度,以及冰的形成和膨胀的物理行为。我们的研究结果表明,这些电化学技术可以实时监测水温度变化和冰成核事件的物理过程。在这里,我们提出了一种使用三桶电化学探针监测微环境中冻结事件的新方法。因为冰成核跨越了许多研究领域,所以有各种各样的工具来更好地理解这些冷冻系统是很重要的。我们的数据表明,电化学可以提供水环境热性质的实时信息,这些类型的测量可以扩展到微滴。电化学信号详细描述了液滴冻结过程中的所有重要时刻,从跟踪温度下降到过冷事件,到电极表面液滴的总结晶,再到液滴融化。最后,这些数据可以与多物理场有限元模型相结合,以关联冰生长动力学、微液滴粘度和电化学数据。总之,这些实验表明电化学可以作为一个独立的工具来监测冻结事件,具有优异的时间和空间分辨率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Analyst
Analyst 化学-分析化学
CiteScore
7.80
自引率
4.80%
发文量
636
审稿时长
1.9 months
期刊介绍: "Analyst" journal is the home of premier fundamental discoveries, inventions and applications in the analytical and bioanalytical sciences.
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