Abstract
The authors have proposed a method, which can measure the distributions of electroosmotic flow velocity and electric field intensity in a micro-channel using μPIV measurement technique. In order to subtract the electrophoretic force effects on the velocities of the tracer particles, two kinds of particles with different electric surface properties were used as the tracer particles. A calibration experiment was firstly conducted using a straight micro-channel to obtain the correlation functions between the apparent electric field intensity and the velocities of the two particles. μPIV measurement was, then, carried out for the target micro-channel to measure the electroosmotic flow and electric fields by applying the same two tracer particles and the correlation function. In the present article, discussion is made on the validity of the present method using two types of channels, namely, a straight channel with a material different to that used in the calibration and a U-bend channel. The results were compared with the experiment using fluorescent dye and also with numerical simulation. In both comparisons, a good agreement was achieved indicating the validity of the method.
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