We demonstrate the use of heat to count microscopic particles. A thermal particle detector (TPD) was fabricated by combining a 500-nm-thick silicon nitride membrane containing a thin-film resistive temperature detector with a silicone elastomer microchannel. Particles with diameters of 90 and 200 μm created relative temperature changes of 0.11 and −0.44 K, respectively, as they flowed by the sensor. A first-order lumped thermal model was developed to predict the temperature changes. Multiple particles were counted in series to demonstrate the utility of the TPD as a particle counter.
CITATION STYLE
Vutha, A. K., Davaji, B., Lee, C. H., & Walker, G. M. (2014). A microfluidic device for thermal particle detection. Microfluidics and Nanofluidics, 17(5), 871–878. https://doi.org/10.1007/s10404-014-1369-z
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