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  • 09월 20일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제126회 대한화학회 학술발표회 및 총회 Electrochemical Analysis of Single Water Droplets using Outer Sphere Reaction

등록일
2020년 9월 17일 14시 06분 24초
접수번호
1116
발표코드
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발표시간
화 09시 : 00분
발표형식
구두발표
발표분야
Electrochemistry - Oral Presentation of Young Scholars in Electrochemistry
저자 및
공동저자
Heekyung Park, Jun Hui Park*
Department of Chemistry, Chungbuk Natioanl University, Korea
We report the electrochemical detection of single water droplets in organic solvent using a ultramicroelectrode (UME). Our previous study observed water droplet in organic solvent using water oxidation reaction. However, the oxidation of water proceeds about 0.81 % inside the water nano-droplet due to the pH change from the reaction product H+. Using the outer sphere redox species which have lower oxidation potential, we could achieve the 100 % oxidation of the redox species dissolved in nano-droplet. The water droplets were detected by amperometric i-t curve. The applied potential was determined by measured cyclic voltammetry organic solvent against aqueous solution to background current and redox potential range, respectively. The size of emulsion included redox species by charge integration has been well match with measured DLS data. The current spike shapes were sharp increased rapidly and then exponentially decay, and it analyzed using a bulk electrolysis model. The droplet size was small enough to assume that the mass-transfer of the redox species in nano-droplet was fast enough. Simulated current decay fitting data showed a very small contact area compared to the droplet size.

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