Microfluidic investigation of mass transport enhancement in nanoparticle suspensions
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It has been observed that extremely low volume-fraction (∼1%) colloidal suspensions of solid nanoparticles (1-100 nm diameter) exhibit a strong enhancement in thermal transport properties relative to the bulk fluid alone. Similar enhancements in mass transport properties have also been reported, but there are still insufficient data to establish a definitive picture of these effects. Here we investigate this phenomena using a microfluidic approach that allows us to directly observe diffusive mass transport of tracer dyes between nanoparticle-laden fluid streams as they flow through a microchannel network. The observed effects strongly depend on flow conditions and the composition of the nanoparticle suspension, and can be harnessed to deposit nanoparticle aggregates at specific locations inside the microchannel. © 2008 CBMS.
author list (cited authors)
Ozturk, S., Hassan, Y. A., & Ugaz, V. M.