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Electroosmosis of Viscoelastic Fluids: Role of Wall Depletion Layer
- Source :
- Langmuir : the ACS journal of surfaces and colloids. 33(43)
- Publication Year :
- 2017
-
Abstract
- We investigate electroosmotic flow of two immiscible viscoelastic fluids in a parallel plate microchannel. Contrary to traditional analysis, the effect of the depletion layer is incorporated near the walls, thereby capturing the complex coupling between rheology and electrokinetics. Toward ensuring realistic prediction, we show the dependence of electroosmotic flow rate on the solution pH and polymer concentration of the complex fluid. In order to assess our theoretical predictions, we have further performed experiments on electroosmosis of an aqueous solution of polyacrylamide (PAAm). Our analysis reveals that neglecting the existence of a depletion layer would result in grossly incorrect predictions of the electroosmotic transport of such fluids. These findings are likely to be of importance in understanding electroosmotically driven transport of complex fluids, including biological fluids, in confined microfluidic environments.
- Subjects :
- Microchannel
Chemistry
Microfluidics
Analytical chemistry
02 engineering and technology
Surfaces and Interfaces
Mechanics
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Viscoelasticity
010305 fluids & plasmas
Volumetric flow rate
Electrokinetic phenomena
Rheology
Depletion region
0103 physical sciences
Electrochemistry
General Materials Science
0210 nano-technology
Spectroscopy
Complex fluid
Subjects
Details
- ISSN :
- 15205827
- Volume :
- 33
- Issue :
- 43
- Database :
- OpenAIRE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Accession number :
- edsair.doi.dedup.....8400c62b8f0d7e2b3386b18eae62d3e4