Avocado oil, coconut oil, walnut oil as true oil phase for ion transfer at nanoscale liquid/liquid interfaces
Avocado oil, coconut oil, walnut oil as true oil phase for ion transfer at nanoscale liquid/liquid interfaces
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DOI：
10.1016/j.electacta.2020.136788
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发表时间：
2020-10-10
影响因子：
6.6
通讯作者：
Shen, Mei
中科院分区：
文献类型：
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作者：
Chen, Ran;Xu, Kerui;Shen, Mei
通常在有机（油）相和水相之间形成的两种不混溶的电解质溶液（ITIES）之间的界面对于化学传感和研究各种电子转移和离子转移反应是必不可少的。溶剂作为ITIES结构的一部分，在ITIES的电化学反应中起着关键作用。虽然已经报道了不同种类的有机相，包括粘性离子液体，但很少探索使用真油作为有机相。在这项研究中，我们介绍了真正的油，包括鳄梨油，椰子油和核桃油作为ITIES的新有机溶剂。我们观察到定义良好的电位窗口，和S形循环伏安图的离子转移。我们进一步测量了在半径类似于20-60 nm的纳米移液管上支撑的真实油-水界面处的离子转移速率常数。我们的研究提供了关于溶剂粘度对液/液界面处的离子转移速率的影响的额外见解，这些真油的粘度类似于1，2-二氯乙烷的粘度的50-70倍。测得四丁基铵在这些真实油水界面上的标准离子迁移速率常数为0.21- 0.32cm/ s。该工作为扩展ITIES平台以探索新的反应奠定了基础，在分离科学、化学传感、化学合成、催化等领域发挥着关键作用。（C）2020由Elsevier Ltd.
The interface between two immiscible electrolyte solutions (ITIES), typically formed between an organic (oil) phase and an aqueous phase, is essential for chemical sensing and for studying various electron transfer and ion transfer reactions. Solvent, as part of ITIES structure, plays critical roles in electrochemical reactions at ITIES. While different kinds of organic phases, including viscous ionic liquid, have been reported, use of true oils as organic phase has rarely been explored. In this study, we introduce true oils, including avocado oil, coconut oil, and walnut oil as new organic solvents for ITIES. We observed well defined potential windows, and sigmoidal cyclic voltammograms for ion transfer. We further measured the ion transfer rate constants at true oil-water interfaces supported at nanopipette of similar to 20-60 nm in radius. Our study offers additional insights on the effect of solvent viscosity on the ion transfer rate at the liquid/liquid interface, with the viscosity of these true oils being similar to 50-70 times that of 1, 2-dichloroethane. We measured the standard ion transfer rate constants of tetrabutylammonium to be 0.21-0.32 cm / s at these true oil-water interface. This work lays the foundation to expand ITIES platform to explore new reactions, playing critical roles in separation science, chemical sensing, chemical synthesis, catalysis, etc. (C) 2020 Published by Elsevier Ltd.