マイクロ・ナノ流路のイオン電流による溶媒粘度の定量評価

抄録

To understand an ion transport phenomenon in micro- and nanoscale, a novel evaluation method is required. In this study, we propose a method to quantitatively evaluate the viscosity of water by focusing on ion transport in micro- and nanochannels. A micro- and nanofluidic channel with a test section of 20 × 1.0 × 0.5 μm (L × W × D) is filled with 10 μM KCl, NaCl, and LiCl solutions, and the viscosity of water is analyzed from the electrical conductivity obtained from the current-voltage characteristics. The temperature dependence of the conductivity in the range from 303 to 343 K reveals the existence of a scaling factor between the water and the electrolyte solutions, and it is also clarified that the quantitative evaluation of liquid viscosity is possible by using the scaling factor associated with the Andrade’s equation.