Amplified Electrokinetic Response by Concentration Polarization near Nanofluidic Channel
作者： Sung Jae Kim , Leon D. Li , Jongyoon Han
DOI: 10.1021/LA900332V
关键词:
摘要: Ion concentration polarization is the fundamental transport phenomenon that occurs near ion-selective membranes, but this important membrane has been poorly understood due to theoretical and experimental challenges. Here, we report first direct measurements of detailed flow electric potential profiles within depletion region. This work an step toward a full characterization coupled problem. Using microfabricated electrodes integrated with microfluidic device, measured confirmed field inside ion region amplified more than 30-fold compared outside zone highly nonuniform distribution along microchannel. As result, electrokinetic motion both fluid (electroosmosis) particle (electrophoresis) was significantly amplified. The profile also for time by optically tracking photobleac...
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