What is it about?
Electro-osmosis
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Why is it important?
we conclude that: The incorporation of the two-phase behavior of the system is essential for capturing important features of the flow and stress fields. The PDL does not only act as a lubrication layer that increases the mean velocity, but it also acts as a protective shield for the fragile polymeric chains against the high shear and normal fields. Consequently, any single-phase formulation [23,27] cannot predict accurately the stresses exerted upon the polymeric solution. Neglecting the viscous contribution of the solvent [24,26,27,57] in the constitutive stress model of the PEO leads to an overestimation of the mean velocity of the whole solution.
Perspectives
The parametric study based on the bulk ionic concentration shows a non- monotonic coupling between the lectrochemical and the rheological features of our system. The most interesting effect is the ability to achieve higher electroosmotic mobilities and lower shear and normal stresses at the interface of the two phases when we have a large depletion layer and large ionic concentration. Such an arrangement can overcome the low mean velocities that characterize the electroosmotic flow without compromising the integrity of the polymeric chains.
Professor John Tsamopoulos
University of Patras
Read the Original
This page is a summary of: Electro-osmotic flow of electrolyte solutions of PEO in microfluidic channels, Journal of Colloid and Interface Science, March 2020, Elsevier,
DOI: 10.1016/j.jcis.2019.12.052.
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