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Ambient Temperature Dependence of Diffusion Rate in a Microfluidic Channel
Abstract:
Microfluidics offers methods of miniaturization for numerous chemical, electrochemical and biological processes. Thermal diffusion of molecular species through microfluidic channels is involved in many of such processes. High specific surface in microchannels complicates the theoretical assessment of diffusion rate in such channels as both the diffusion coefficient and the physisorption rate to the channel walls are temperature-sensitive. In this work, it is shown that both of these parameters vary in the same direction with temperature and the superposition of their respective effects makes the process rate highly temperature-sensitive. The molecular diffusion rates for three different molecular species, 2-butanol, tert-butanol and hydrogen, through a centimeter-long microchannel are experimentally monitored at the ambient temperature. Repeating such recording at different ambient temperatures facilitates the measurement and comparison of the temperature sensitivities of these processes. Among the fluids examined, those with lower diffusion coefficients showed more significant temperature dependences. The fabrication of the microfluidic system and the method utilized for monitoring the diffusion rate are also described in this paper.
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127-130
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April 2014
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© 2014 Trans Tech Publications Ltd. All Rights Reserved
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