イオンの電気泳動に駆動される流れ場の可視化と理論解析

抄録

Recently, engineering applications of ion transport phenomena and related liquid flows have attracted much attention. Since fabrication techniques of micro- and nano-fluidic channels have enabled us to precisely control such flow fields, several technologies, such as micro-pumps, rectifier, and ionic field effect transistors, have been developed. On the other hand, some ambiguities have remained in the mechanism of liquid flows driven by interacting ions. In this study, liquid flows driven by ion transport phenomena are investigated to deepen the understanding of fundamentals and to extend this kind of flows to be available in the larger space. Herein, liquid flows dragged by electrophoretic transport of ions are experimentally observed in a flow channel that has a 1 mm × 1 mm cross-section. We succeeded to induce electrohydroynamic flows in millimeter-scale spaces and furthermore, the applied electric potential was extremely reduced by preparing monopole ion solutions in which positive or negative ions were dominantly presence.