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마이크로 전기탈이온 시스템: 이온 농도 분석 및 유체 유동 가시화
박수동(Sudong Park),곽노균(Rhokyun Kwak) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Electrodeionization (EDI) is a membrane-based desalination utilizing ion exchange membranes and ion exchange resins. By combining Electrodialysis and Ion exchanger, EDI can produce ultrapure water. Although its theoretical mechanisms are well documented, there is no experimental platform which can observe microscopic details inside of the system. In this paper, we present the microscale EDI that can visualize in situ ion concentration, pH, and fluid flows. This visualization platform was fabricated by filling ion exchange resins as a monolayer in the transparent polydimethylsiloxane channel between cation/anion exchange membranes. According to operating voltages (0-15 V), distinct behaviors of ion concentration profile, pH shift, and fluid flows were observed in Ohmic, limiting, and overlimiting regimes. It is noteworthy that overlimiting regimes can be sub-categorized as a water-splitting and electroconvection regimes, which is a clear departure from the dynamics in electrodialysis and ion exchanger. Although such dynamic behaviors have been predicted previously, this is the first time that they were clearly visualized in a realistic EDI model.