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Ping Sheng

2012-01-05
13:20:00 - 14:10:00

101 , Mathematics Research Center Building (ori. New Math. Bldg.)

Electroosmotic effect is recognized to play an important role in biological functions, owing to the prevalence of charged ions in bio-systems. As an interfacial effect, there is a general expectation of increased efficiency with increased surface-to-volume ratio, i.e., as the channel diameter decreases. However, the surface charge boundary condition that leads to the Debye double layer is necessarily constrained by the non-slip (or the very small slip) fluid-solid interfacial boundary condition. In this talk, I present both experimental results and theory predictions that indicate the result of the interplay between these two boundary conditions can lead to a condition for the maximum efficiency of the electroosmotic effect, attained at a channel diameter that is roughly five times the Debye length.

For material related to this talk, click here.