Abstract
In this work, we present a fluorescence-based microfluidic approach to study the transport characteristics in gas–liquid reaction system with hydrogen peroxide (H2O2). A system of nitrogen dioxide (NO2) and H2O2 was served as model to determinate diffusion coefficient of NO2. The diffusion coefficient was quantified through fading of fluorescent signals by increase of pH during the diffusion process. The diffusion coefficients were served as parameters to fit for a diffusion transport model as a function of time and determined to be 8.55 × 10−9 m2/s on average. The thickness of liquid film according to two film theory was obtained as a reasonable value of 180 μm given by the optimal fitting performance. The experimental operation for measurement of diffusion coefficient took only about 3 min. This paper provides an in situ, time-efficient, sample-saving and non-invasive approach to investigate microscale transport characteristics of gas–liquid systems.
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