移動度の異なるトレーサ粒子を用いた電場と界面動電現象の計測(<小特集>非ニュートン性,機能性を示す複雑流体の流動と応用)

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  • Measurements of Electric Field and Electrokinetic Phenomena Using Two Kinds of Tracer Particles with Different Mobilities(<Special Issue>Flow Behaviour and Applications of Complex Fluids Characterized by Non-Newtonian Viscosity or Functionality)
  • 移動度の異なるトレーサ粒子を用いた電場と界面動電現象の計測
  • イドウド ノ コトナル トレーサ リュウシ オ モチイタ デンバ ト カイメンドウデンゲンショウ ノ ケイソク

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In this study, we propose a novel technique for the measurements of electric field and electrokinetic phenomena in microchannels using two kinds of tracer particles with different electrophoretic mobilities. In the present technique, electric field, which is quite difficult to be measured precisely so far, is obtained from the velocity differences between two kinds of tracer particles. The principle of the electric field measurement is based on the mathematical analysis of the different flow fields, which are induced by the different particle mobilities. The experimental demonstration is successfully conducted both in a straight microchannel and a T-shaped one with rectangular cross sections. Each tracer particle with different mobilities due to the surface charge densities is mixed in a buffer solution and the flow is analyzed by means of PIV (particle image velocimetry). The experimental results of the electric field are comapred with the roughly estimated values based on the numerical calculations of Laplace equation. The comparison indicates the applicability of the proposed technique because they are in a reasonable agreement. Moreover, the detailed componets in electrokinetic phenomena, e.g., the electrophoresis and electro osmosis flow, are successfully investigated using the electric field obtained here. These results lead us to conclude that the proposed method can be used as a practical tool to access the detail of electrokinetic phenomena in microchannels.

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