Analyzing Benzene and Cyclohexane Emulsion Droplet Collisions on Ultramicroelectrodes

被引:69
作者
Li, Yan [1 ]
Deng, Haiqiang [1 ]
Dick, Jeffrey E. [1 ]
Bard, Allen J. [1 ]
机构
[1] Univ Texas Austin, Ctr Electrochem, Dept Chem, Austin, TX 78712 USA
基金
美国国家科学基金会;
关键词
SINGLE NANOPARTICLE COLLISIONS; ELECTROCHEMICAL DETECTION; OXIDATION; EVENTS; SILVER;
D O I
10.1021/acs.analchem.5b02968
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
We report the collisions of single emulsion oil droplets with extremely low dielectric constants (e.g., benzene, epsilon of 2.27, or cyclohexane, epsilon of 2.02) as studied via emulsion droplet reactor (EDR) on an ultramicroelectrode (UME). By applying appropriate potentials to the UME, we observed the electrochemical effects of single-collision signals from the bulk electrolysis of single emulsion droplets. Different hydrophobic redox species (ferrocene, decamethyl-ferrocene, or metalloporphyrin) were trapped in a mixed benzene (or cyclohexane) oil-in-water emulsion using an ionic liquid as the supporting electrolyte and emulsifier. The emulsions were prepared using ultrasonic processing. Spike-like responses were observed in each i-t response due to the complete electrolysis of all of the above-mentioned redox species within the droplet. On the basis of these single-particle collision results, the collision frequency, size distribution, i-t decay behavior of the emulsion droplets, and possible mechanisms are analyzed and discussed. This work demonstrated that bulk electrolysis can be achieved in a few seconds in these attoliter reactors, suggesting many applications, such as analysis and electrosynthesis in low dielectric constant solvents, which have a much broader potential window.
引用
收藏
页码:11013 / 11021
页数:9
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